Harmonize ConditionOutcome messages

Add ConditionMessage class to help build condition messages in a
uniform format and update existing conditions to use it.

Fixes gh-6756

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/EndpointMBeanExportAutoConfiguration.java

@@ -26,6 +26,7 @@ import org.springframework.boot.actuate.endpoint.Endpoint;
 import org.springframework.boot.actuate.endpoint.jmx.EndpointMBeanExporter;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
@@ -92,8 +93,13 @@ public class EndpointMBeanExportAutoConfiguration {
 				AnnotatedTypeMetadata metadata) {
 			boolean jmxEnabled = isEnabled(context, "spring.jmx.");
 			boolean jmxEndpointsEnabled = isEnabled(context, "endpoints.jmx.");
-			return new ConditionOutcome(jmxEnabled && jmxEndpointsEnabled,
-					"JMX Endpoints");
+			if (jmxEnabled && jmxEndpointsEnabled) {
+				return ConditionOutcome.match(
+						ConditionMessage.forCondition("JMX Enabled").found("properties")
+								.items("spring.jmx.enabled", "endpoints.jmx.enabled"));
+			}
+			return ConditionOutcome.noMatch(ConditionMessage.forCondition("JMX Enabled")
+					.because("spring.jmx.enabled or endpoints.jmx.enabled is not set"));
 		}
 
 		private boolean isEnabled(ConditionContext context, String prefix) {

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/EndpointWebMvcAutoConfiguration.java

@@ -40,6 +40,7 @@ import org.springframework.boot.actuate.endpoint.mvc.ManagementServletContext;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.PropertyPlaceholderAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
@@ -333,13 +334,18 @@ public class EndpointWebMvcAutoConfiguration
 		@Override
 		public ConditionOutcome getMatchOutcome(ConditionContext context,
 				AnnotatedTypeMetadata metadata) {
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("Management Server MVC");
 			if (!(context.getResourceLoader() instanceof WebApplicationContext)) {
-				return ConditionOutcome.noMatch("Non WebApplicationContext");
+				return ConditionOutcome
+						.noMatch(message.because("non WebApplicationContext"));
 			}
 			ManagementServerPort port = ManagementServerPort.get(context.getEnvironment(),
 					context.getBeanFactory());
-			return new ConditionOutcome(port == ManagementServerPort.SAME,
-					"Management context");
+			if (port == ManagementServerPort.SAME) {
+				return ConditionOutcome.match(message.because("port is same"));
+			}
+			return ConditionOutcome.noMatch(message.because("port is not same"));
 		}
 
 	}

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/EndpointWebMvcManagementContextConfiguration.java

@@ -37,6 +37,7 @@ import org.springframework.boot.actuate.endpoint.mvc.MetricsMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.MvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.MvcEndpoints;
 import org.springframework.boot.actuate.endpoint.mvc.ShutdownMvcEndpoint;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
@@ -182,20 +183,22 @@ public class EndpointWebMvcManagementContextConfiguration {
 				AnnotatedTypeMetadata metadata) {
 			Environment environment = context.getEnvironment();
 			String config = environment.resolvePlaceholders("${logging.file:}");
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("Log File");
 			if (StringUtils.hasText(config)) {
-				return ConditionOutcome.match("Found logging.file: " + config);
+				return ConditionOutcome.match(message.found("logging.file").items(config));
 			}
 			config = environment.resolvePlaceholders("${logging.path:}");
 			if (StringUtils.hasText(config)) {
-				return ConditionOutcome.match("Found logging.path: " + config);
+				return ConditionOutcome.match(message.found("logging.path").items(config));
 			}
 			config = new RelaxedPropertyResolver(environment, "endpoints.logfile.")
 					.getProperty("external-file");
 			if (StringUtils.hasText(config)) {
-				return ConditionOutcome
-						.match("Found endpoints.logfile.external-file: " + config);
+				return ConditionOutcome.match(
+						message.found("endpoints.logfile.external-file").items(config));
 			}
-			return ConditionOutcome.noMatch("Found no log file configuration");
+			return ConditionOutcome.noMatch(message.didNotFind("logging file").atAll());
 		}
 
 	}

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/JolokiaAutoConfiguration.java

@@ -25,6 +25,7 @@ import org.springframework.boot.actuate.endpoint.mvc.JolokiaMvcEndpoint;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
@@ -97,8 +98,12 @@ public class JolokiaAutoConfiguration {
 		public ConditionOutcome getMatchOutcome(ConditionContext context,
 				AnnotatedTypeMetadata metadata) {
 			boolean endpointsEnabled = isEnabled(context, "endpoints.", true);
-			boolean enabled = isEnabled(context, "endpoints.jolokia.", endpointsEnabled);
-			return new ConditionOutcome(enabled, "Jolokia enabled");
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("Jolokia");
+			if (isEnabled(context, "endpoints.jolokia.", endpointsEnabled)) {
+				return ConditionOutcome.match(message.because("enabled"));
+			}
+			return ConditionOutcome.noMatch(message.because("not enabled"));
 		}
 
 		private boolean isEnabled(ConditionContext context, String prefix,

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/ManagementWebSecurityAutoConfiguration.java

@@ -33,6 +33,7 @@ import org.springframework.boot.actuate.endpoint.mvc.MvcEndpoint;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
@@ -223,10 +224,13 @@ public class ManagementWebSecurityAutoConfiguration {
 					.getProperty("management.security.enabled", "true");
 			String basicEnabled = context.getEnvironment()
 					.getProperty("security.basic.enabled", "true");
-			return new ConditionOutcome(
-					"true".equalsIgnoreCase(managementEnabled)
-							&& !"true".equalsIgnoreCase(basicEnabled),
-					"Management security enabled and basic disabled");
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("WebSecurityEnabled");
+			if ("true".equalsIgnoreCase(managementEnabled)
+					&& !"true".equalsIgnoreCase(basicEnabled)) {
+				return ConditionOutcome.match(message.because("security enabled"));
+			}
+			return ConditionOutcome.noMatch(message.because("security disabled"));
 		}
 
 	}

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/OnEnabledEndpointElementCondition.java

@@ -16,6 +16,9 @@
 
 package org.springframework.boot.actuate.autoconfigure;
 
+import java.lang.annotation.Annotation;
+
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
 import org.springframework.boot.bind.RelaxedPropertyResolver;
@@ -33,9 +36,10 @@ abstract class OnEnabledEndpointElementCondition extends SpringBootCondition {
 
 	private final String prefix;
 
-	private final Class<?> annotationType;
+	private final Class<? extends Annotation> annotationType;
 
-	OnEnabledEndpointElementCondition(String prefix, Class<?> annotationType) {
+	OnEnabledEndpointElementCondition(String prefix,
+			Class<? extends Annotation> annotationType) {
 		this.prefix = prefix;
 		this.annotationType = annotationType;
 	}
@@ -69,7 +73,8 @@ abstract class OnEnabledEndpointElementCondition extends SpringBootCondition {
 		if (resolver.containsProperty("enabled")) {
 			boolean match = resolver.getProperty("enabled", Boolean.class, true);
 			return new ConditionOutcome(match,
-					getEndpointElementOutcomeMessage(endpointName, match));
+					ConditionMessage.forCondition(this.annotationType).because(
+							this.prefix + endpointName + ".enabled is " + match));
 		}
 		return null;
 	}
@@ -79,7 +84,8 @@ abstract class OnEnabledEndpointElementCondition extends SpringBootCondition {
 				context.getEnvironment(), this.prefix + "defaults.");
 		boolean match = Boolean.valueOf(resolver.getProperty("enabled", "true"));
 		return new ConditionOutcome(match,
-				getDefaultEndpointElementOutcomeMessage(match));
+				ConditionMessage.forCondition(this.annotationType).because(
+						this.prefix + "defaults.enabled is considered " + match));
 	}
 
 }

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/condition/OnEnabledEndpointCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,7 @@
 
 package org.springframework.boot.actuate.condition;
 
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
 import org.springframework.boot.bind.RelaxedPropertyResolver;
@@ -31,14 +32,11 @@ import org.springframework.core.type.AnnotatedTypeMetadata;
  */
 class OnEnabledEndpointCondition extends SpringBootCondition {
 
-	private static final String ANNOTATION_CLASS = ConditionalOnEnabledEndpoint.class
-			.getName();
-
 	@Override
 	public ConditionOutcome getMatchOutcome(ConditionContext context,
 			AnnotatedTypeMetadata metadata) {
-		AnnotationAttributes annotationAttributes = AnnotationAttributes
-				.fromMap(metadata.getAnnotationAttributes(ANNOTATION_CLASS));
+		AnnotationAttributes annotationAttributes = AnnotationAttributes.fromMap(metadata
+				.getAnnotationAttributes(ConditionalOnEnabledEndpoint.class.getName()));
 		String endpointName = annotationAttributes.getString("value");
 		boolean enabledByDefault = annotationAttributes.getBoolean("enabledByDefault");
 		ConditionOutcome outcome = determineEndpointOutcome(endpointName,
@@ -56,8 +54,11 @@ class OnEnabledEndpointCondition extends SpringBootCondition {
 		if (resolver.containsProperty("enabled") || !enabledByDefault) {
 			boolean match = resolver.getProperty("enabled", Boolean.class,
 					enabledByDefault);
-			return new ConditionOutcome(match, "The endpoint " + endpointName + " is "
-					+ (match ? "enabled" : "disabled"));
+			ConditionMessage message = ConditionMessage
+					.forCondition(ConditionalOnEnabledEndpoint.class,
+							"(" + endpointName + ")")
+					.because(match ? "enabled" : "disabled");
+			return new ConditionOutcome(match, message);
 		}
 		return null;
 	}
@@ -66,8 +67,11 @@ class OnEnabledEndpointCondition extends SpringBootCondition {
 		RelaxedPropertyResolver resolver = new RelaxedPropertyResolver(
 				context.getEnvironment(), "endpoints.");
 		boolean match = Boolean.valueOf(resolver.getProperty("enabled", "true"));
-		return new ConditionOutcome(match,
-				"All endpoints are " + (match ? "enabled" : "disabled") + " by default");
+		ConditionMessage message = ConditionMessage
+				.forCondition(ConditionalOnEnabledEndpoint.class)
+				.because("All endpoints are " + (match ? "enabled" : "disabled")
+						+ " by default");
+		return new ConditionOutcome(match, message);
 	}
 
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/MessageSourceAutoConfiguration.java

@@ -19,6 +19,7 @@ package org.springframework.boot.autoconfigure;
 import java.nio.charset.Charset;
 
 import org.springframework.boot.autoconfigure.MessageSourceAutoConfiguration.ResourceBundleCondition;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.SearchStrategy;
@@ -161,17 +162,19 @@ public class MessageSourceAutoConfiguration {
 
 		private ConditionOutcome getMatchOutcomeForBasename(ConditionContext context,
 				String basename) {
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("ResourceBundle");
 			for (String name : StringUtils.commaDelimitedListToStringArray(
 					StringUtils.trimAllWhitespace(basename))) {
 				for (Resource resource : getResources(context.getClassLoader(), name)) {
 					if (resource.exists()) {
-						return ConditionOutcome.match("Bundle found for "
-								+ "spring.messages.basename: " + name);
+						return ConditionOutcome
+								.match(message.found("bundle").items(resource));
 					}
 				}
 			}
 			return ConditionOutcome.noMatch(
-					"No bundle found for " + "spring.messages.basename: " + basename);
+					message.didNotFind("bundle with basename " + basename).atAll());
 		}
 
 		private Resource[] getResources(ClassLoader classLoader, String name) {

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cache/CacheCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,12 +16,14 @@
 
 package org.springframework.boot.autoconfigure.cache;
 
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
 import org.springframework.boot.bind.RelaxedPropertyResolver;
 import org.springframework.context.annotation.ConditionContext;
 import org.springframework.core.type.AnnotatedTypeMetadata;
 import org.springframework.core.type.AnnotationMetadata;
+import org.springframework.core.type.ClassMetadata;
 
 /**
  * General cache condition used with all cache configuration classes.
@@ -35,18 +37,24 @@ class CacheCondition extends SpringBootCondition {
 	@Override
 	public ConditionOutcome getMatchOutcome(ConditionContext context,
 			AnnotatedTypeMetadata metadata) {
+		String sourceClass = "";
+		if (metadata instanceof ClassMetadata) {
+			sourceClass = ((ClassMetadata) metadata).getClassName();
+		}
+		ConditionMessage.Builder message = ConditionMessage.forCondition("Cache",
+				sourceClass);
 		RelaxedPropertyResolver resolver = new RelaxedPropertyResolver(
 				context.getEnvironment(), "spring.cache.");
 		if (!resolver.containsProperty("type")) {
-			return ConditionOutcome.match("Automatic cache type");
+			return ConditionOutcome.match(message.because("automatic cache type"));
 		}
 		CacheType cacheType = CacheConfigurations
 				.getType(((AnnotationMetadata) metadata).getClassName());
 		String value = resolver.getProperty("type").replace("-", "_").toUpperCase();
 		if (value.equals(cacheType.name())) {
-			return ConditionOutcome.match("Cache type " + cacheType);
+			return ConditionOutcome.match(message.because(value + " cache type"));
 		}
-		return ConditionOutcome.noMatch("Cache type " + value);
+		return ConditionOutcome.noMatch(message.because(value + " cache type"));
 	}
 
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cache/JCacheCacheConfiguration.java

@@ -28,6 +28,7 @@ import javax.cache.spi.CachingProvider;
 
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.condition.AnyNestedCondition;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
@@ -177,23 +178,28 @@ class JCacheCacheConfiguration {
 		@Override
 		public ConditionOutcome getMatchOutcome(ConditionContext context,
 				AnnotatedTypeMetadata metadata) {
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("JCache");
 			RelaxedPropertyResolver resolver = new RelaxedPropertyResolver(
 					context.getEnvironment(), "spring.cache.jcache.");
 			if (resolver.containsProperty("provider")) {
-				return ConditionOutcome.match("JCache provider specified");
+				return ConditionOutcome
+						.match(message.because("JCache provider specified"));
 			}
 			Iterator<CachingProvider> providers = Caching.getCachingProviders()
 					.iterator();
 			if (!providers.hasNext()) {
-				return ConditionOutcome.noMatch("No JSR-107 compliant providers");
+				return ConditionOutcome
+						.noMatch(message.didNotFind("JSR-107 provider").atAll());
 			}
 			providers.next();
 			if (providers.hasNext()) {
-				return ConditionOutcome.noMatch(
-						"Multiple default JSR-107 compliant " + "providers found");
+				return ConditionOutcome
+						.noMatch(message.foundExactly("multiple JSR-107 providers"));
 
 			}
-			return ConditionOutcome.match("Default JSR-107 compliant provider found.");
+			return ConditionOutcome
+					.match(message.foundExactly("single JSR-107 provider"));
 		}
 
 	}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/AbstractNestedCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -35,7 +35,6 @@ import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
-import org.springframework.util.StringUtils;
 
 /**
  * Abstract base class for nested conditions.
@@ -171,16 +170,18 @@ abstract class AbstractNestedCondition extends SpringBootCondition
 
 		private ConditionOutcome getConditionOutcome(AnnotationMetadata metadata,
 				Condition condition) {
-			String messagePrefix = "member condition on " + metadata.getClassName();
+			String className = ClassUtils.getShortName(metadata.getClassName());
 			if (condition instanceof SpringBootCondition) {
 				ConditionOutcome outcome = ((SpringBootCondition) condition)
 						.getMatchOutcome(this.context, metadata);
-				String message = outcome.getMessage();
-				return new ConditionOutcome(outcome.isMatch(), messagePrefix
-						+ (StringUtils.hasLength(message) ? " : " + message : ""));
+				ConditionMessage message = outcome.getConditionMessage()
+						.append("on member " + className);
+				return new ConditionOutcome(outcome.isMatch(), message);
 			}
 			boolean matches = condition.matches(this.context, metadata);
-			return new ConditionOutcome(matches, messagePrefix);
+			return new ConditionOutcome(matches,
+					ConditionMessage.forCondition("NestedCondition")
+							.because("nested on member " + className));
 		}
 
 	}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/AllNestedConditions.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,9 @@
 
 package org.springframework.boot.autoconfigure.condition;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import org.springframework.context.annotation.Condition;
 
 /**
@@ -47,11 +50,19 @@ public abstract class AllNestedConditions extends AbstractNestedCondition {
 
 	@Override
 	protected ConditionOutcome getFinalMatchOutcome(MemberMatchOutcomes memberOutcomes) {
-		return new ConditionOutcome(
-				memberOutcomes.getMatches().size() == memberOutcomes.getAll().size(),
-				"nested all match resulted in " + memberOutcomes.getMatches()
-						+ " matches and " + memberOutcomes.getNonMatches()
-						+ " non matches");
+		boolean match = hasSameSize(memberOutcomes.getMatches(), memberOutcomes.getAll());
+		List<ConditionMessage> messages = new ArrayList<ConditionMessage>();
+		messages.add(ConditionMessage.forCondition("AllNestedConditions")
+				.because(memberOutcomes.getMatches().size() + " matched "
+						+ memberOutcomes.getNonMatches().size() + " did not"));
+		for (ConditionOutcome outcome : memberOutcomes.getAll()) {
+			messages.add(outcome.getConditionMessage());
+		}
+		return new ConditionOutcome(match, ConditionMessage.of(messages));
+	}
+
+	private boolean hasSameSize(List<?> list1, List<?> list2) {
+		return list1.size() == list2.size();
 	}
 
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/AnyNestedCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,9 @@
 
 package org.springframework.boot.autoconfigure.condition;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import org.springframework.context.annotation.Condition;
 import org.springframework.core.Ordered;
 import org.springframework.core.annotation.Order;
@@ -50,11 +53,15 @@ public abstract class AnyNestedCondition extends AbstractNestedCondition {
 
 	@Override
 	protected ConditionOutcome getFinalMatchOutcome(MemberMatchOutcomes memberOutcomes) {
-		return new ConditionOutcome(!memberOutcomes.getMatches().isEmpty(),
-				"nested any match resulted in " + memberOutcomes.getMatches()
-						+ " matches and " + memberOutcomes.getNonMatches()
-						+ " non matches");
-
+		boolean match = !memberOutcomes.getMatches().isEmpty();
+		List<ConditionMessage> messages = new ArrayList<ConditionMessage>();
+		messages.add(ConditionMessage.forCondition("AnyNestedCondition")
+				.because(memberOutcomes.getMatches().size() + " matched "
+						+ memberOutcomes.getNonMatches().size() + " did not"));
+		for (ConditionOutcome outcome : memberOutcomes.getAll()) {
+			messages.add(outcome.getConditionMessage());
+		}
+		return new ConditionOutcome(match, ConditionMessage.of(messages));
 	}
 
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/ConditionEvaluationReport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -127,8 +127,8 @@ public final class ConditionEvaluationReport {
 		String prefix = source + "$";
 		for (Entry<String, ConditionAndOutcomes> entry : this.outcomes.entrySet()) {
 			if (entry.getKey().startsWith(prefix)) {
-				ConditionOutcome outcome = new ConditionOutcome(false,
-						"Ancestor '" + source + "' did not match");
+				ConditionOutcome outcome = ConditionOutcome.noMatch(ConditionMessage
+						.forCondition("Ancestor " + source).because("did not match"));
 				entry.getValue().add(ANCESTOR_CONDITION, outcome);
 			}
 		}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/ConditionMessage.java

@@ -0,0 +1,435 @@
+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.condition;
+
+import java.lang.annotation.Annotation;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+import org.springframework.util.Assert;
+import org.springframework.util.ClassUtils;
+import org.springframework.util.ObjectUtils;
+import org.springframework.util.StringUtils;
+
+/**
+ * A message associated with a {@link ConditionOutcome}. Provides a fluent builder style
+ * API to encourage consistency across all condition messages.
+ *
+ * @author Phillip Webb
+ * @since 1.4.1
+ */
+public final class ConditionMessage {
+
+	private String message;
+
+	private ConditionMessage() {
+		this(null);
+	}
+
+	private ConditionMessage(String message) {
+		this.message = message;
+	}
+
+	private ConditionMessage(ConditionMessage prior, String message) {
+		this.message = (prior.isEmpty() ? message : prior + "; " + message);
+	}
+
+	/**
+	 * Return {@code true} if the message is empty.
+	 * @return if the message is empty
+	 */
+	public boolean isEmpty() {
+		return !StringUtils.hasLength(this.message);
+	}
+
+	@Override
+	public String toString() {
+		return (this.message == null ? "" : this.message);
+	}
+
+	@Override
+	public int hashCode() {
+		return ObjectUtils.nullSafeHashCode(this.message);
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (obj == null || !ConditionMessage.class.isInstance(obj)) {
+			return false;
+		}
+		if (obj == this) {
+			return true;
+		}
+		return ObjectUtils.nullSafeEquals(((ConditionMessage) obj).message, this.message);
+	}
+
+	/**
+	 * Return a new {@link ConditionMessage} based on the instance and an appended
+	 * message.
+	 * @param message the message to append
+	 * @return a new {@link ConditionMessage} instance
+	 */
+	public ConditionMessage append(String message) {
+		if (!StringUtils.hasLength(message)) {
+			return this;
+		}
+		if (!StringUtils.hasLength(this.message)) {
+			return new ConditionMessage(message);
+		}
+
+		return new ConditionMessage(this.message + " " + message);
+	}
+
+	/**
+	 * Return a new builder to construct a new {@link ConditionMessage} based on the
+	 * instance and a new condition outcome.
+	 * @param condition the condition
+	 * @param details details of the condition
+	 * @return a {@link Builder} builder
+	 * @see #andCondition(String, Object...)
+	 * @see #forCondition(Class, Object...)
+	 */
+	public Builder andCondition(Class<? extends Annotation> condition,
+			Object... details) {
+		Assert.notNull(condition, "Condition must not be null");
+		return andCondition("@" + ClassUtils.getShortName(condition), details);
+	}
+
+	/**
+	 * Return a new builder to construct a new {@link ConditionMessage} based on the
+	 * instance and a new condition outcome.
+	 * @param condition the condition
+	 * @param details details of the condition
+	 * @return a {@link Builder} builder
+	 * @see #andCondition(Class, Object...)
+	 * @see #forCondition(String, Object...)
+	 */
+	public Builder andCondition(String condition, Object... details) {
+		Assert.notNull(condition, "Condition must not be null");
+		String detail = StringUtils.arrayToDelimitedString(details, " ");
+		if (StringUtils.hasLength(detail)) {
+			return new Builder(condition + " " + detail);
+		}
+		return new Builder(condition);
+	}
+
+	/**
+	 * Factory method to return a new empty {@link ConditionMessage}.
+	 * @return a new empty {@link ConditionMessage}
+	 */
+	public static ConditionMessage empty() {
+		return new ConditionMessage();
+	}
+
+	/**
+	 * Factory method to create a new {@link ConditionMessage} with a specific message.
+	 * @param message the source message (may be a format string if {@code args} are
+	 * specified
+	 * @param args format arguments for the message
+	 * @return a new {@link ConditionMessage} instance
+	 */
+	public static ConditionMessage of(String message, Object... args) {
+		if (ObjectUtils.isEmpty(args)) {
+			return new ConditionMessage(message);
+		}
+		return new ConditionMessage(String.format(message, args));
+	}
+
+	/**
+	 * Factory method to create a new {@link ConditionMessage} comprised of the specified
+	 * messages.
+	 * @param messages the source messages (may be {@code null}
+	 * @return a new {@link ConditionMessage} instance
+	 */
+	public static ConditionMessage of(Collection<? extends ConditionMessage> messages) {
+		ConditionMessage result = new ConditionMessage();
+		if (messages != null) {
+			for (ConditionMessage message : messages) {
+				result = new ConditionMessage(result, message.toString());
+			}
+		}
+		return result;
+	}
+
+	/**
+	 * Factory method for a builder to construct a new {@link ConditionMessage} for a
+	 * condition.
+	 * @param condition the condition
+	 * @param details details of the condition
+	 * @return a {@link Builder} builder
+	 * @see #forCondition(String, Object...)
+	 * @see #andCondition(String, Object...)
+	 */
+	public static Builder forCondition(Class<? extends Annotation> condition,
+			Object... details) {
+		return new ConditionMessage().andCondition(condition, details);
+	}
+
+	/**
+	 * Factory method for a builder to construct a new {@link ConditionMessage} for a
+	 * condition.
+	 * @param condition the condition
+	 * @param details details of the condition
+	 * @return a {@link Builder} builder
+	 * @see #forCondition(Class, Object...)
+	 * @see #andCondition(String, Object...)
+	 */
+	public static Builder forCondition(String condition, Object... details) {
+		return new ConditionMessage().andCondition(condition, details);
+	}
+
+	/**
+	 * Builder used to create a {@link ConditionMessage} for a condition.
+	 */
+	public final class Builder {
+
+		private final String condition;
+
+		private Builder(String condition) {
+			this.condition = condition;
+		}
+
+		/**
+		 * Indicate that an exact result was found. For example
+		 * {@code foundExactly("foo")} results in the message "found foo".
+		 * @param result the result that was found
+		 * @return a built {@link ConditionMessage}
+		 */
+		public ConditionMessage foundExactly(Object result) {
+			return found("").items(result);
+		}
+
+		/**
+		 * Indicate that one or more results were found. For example
+		 * {@code found("bean").items("x")} results in the message "found bean x".
+		 * @param article the article found
+		 * @return an {@link ItemsBuilder}
+		 */
+		public ItemsBuilder found(String article) {
+			return found(article, article);
+		}
+
+		/**
+		 * Indicate that one or more results were found. For example
+		 * {@code found("bean", "beans").items("x", "y")} results in the message
+		 * "found beans x, y".
+		 * @param singular the article found in singular form
+		 * @param plural the article found in plural form
+		 * @return an {@link ItemsBuilder}
+		 */
+		public ItemsBuilder found(String singular, String plural) {
+			return new ItemsBuilder(this, "found", singular, plural);
+		}
+
+		/**
+		 * Indicate that one or more results were not found. For example
+		 * {@code didNotFind("bean").items("x")} results in the message
+		 * "did not find bean x".
+		 * @param article the article found
+		 * @return an {@link ItemsBuilder}
+		 */
+		public ItemsBuilder didNotFind(String article) {
+			return didNotFind(article, article);
+		}
+
+		/**
+		 * Indicate that one or more results were found. For example
+		 * {@code didNotFind("bean", "beans").items("x", "y")} results in the message
+		 * "did not find beans x, y".
+		 * @param singular the article found in singular form
+		 * @param plural the article found in plural form
+		 * @return an {@link ItemsBuilder}
+		 */
+		public ItemsBuilder didNotFind(String singular, String plural) {
+			return new ItemsBuilder(this, "did not find", singular, plural);
+		}
+
+		/**
+		 * Indicates a single result. For example {@code resultedIn("yes")} results in the
+		 * message "resulted in yes".
+		 * @param result the result
+		 * @return a built {@link ConditionMessage}
+		 */
+		public ConditionMessage resultedIn(Object result) {
+			return because("resulted in " + result);
+		}
+
+		/**
+		 * Indicates something is available. For example {@code available("money")}
+		 * results in the message "money is available".
+		 * @param item the item that is available
+		 * @return a built {@link ConditionMessage}
+		 */
+		public ConditionMessage available(String item) {
+			return because(item + " is available");
+		}
+
+		/**
+		 * Indicates something is not available. For example {@code notAvailable("time")}
+		 * results in the message "time in not available".
+		 * @param item the item that is not available
+		 * @return a built {@link ConditionMessage}
+		 */
+		public ConditionMessage notAvailable(String item) {
+			return because(item + " is not available");
+		}
+
+		/**
+		 * Indicates the reason. For example {@code reason("running Linux")} results in
+		 * the message "running Linux".
+		 * @param reason the reason for the message
+		 * @return a built {@link ConditionMessage}
+		 */
+		public ConditionMessage because(String reason) {
+			if (StringUtils.isEmpty(reason)) {
+				return new ConditionMessage(ConditionMessage.this, this.condition);
+			}
+			return new ConditionMessage(ConditionMessage.this,
+					this.condition + " " + reason);
+		}
+
+	}
+
+	/**
+	 * Builder used to create a {@link ItemsBuilder} for a condition.
+	 */
+	public final class ItemsBuilder {
+
+		private final Builder condition;
+
+		private final String reson;
+
+		private final String singular;
+
+		private final String plural;
+
+		private ItemsBuilder(Builder condition, String reason, String singular,
+				String plural) {
+			this.condition = condition;
+			this.reson = reason;
+			this.singular = singular;
+			this.plural = plural;
+		}
+
+		/**
+		 * Used when no items are available. For example
+		 * {@code didNotFind("any beans").atAll()} results in the message
+		 * "did not find any beans".
+		 * @return a built {@link ConditionMessage}
+		 */
+		public ConditionMessage atAll() {
+			return items(Collections.emptyList());
+		}
+
+		/**
+		 * Indicate the items. For example
+		 * {@code didNotFind("bean", "beans").items("x", "y")} results in the message
+		 * "did not find beans x, y".
+		 * @param items the items (may be {@code null})
+		 * @return a built {@link ConditionMessage}
+		 */
+		public ConditionMessage items(Object... items) {
+			return items(Style.NORMAL, items);
+		}
+
+		/**
+		 * Indicate the items. For example
+		 * {@code didNotFind("bean", "beans").items("x", "y")} results in the message
+		 * "did not find beans x, y".
+		 * @param style the render style
+		 * @param items the items (may be {@code null})
+		 * @return a built {@link ConditionMessage}
+		 */
+		public ConditionMessage items(Style style, Object... items) {
+			return items(style,
+					items == null ? (Collection<?>) null : Arrays.asList(items));
+		}
+
+		/**
+		 * Indicate the items. For example
+		 * {@code didNotFind("bean", "beans").items(Collections.singleton("x")} results in
+		 * the message "did not find bean x".
+		 * @param items the source of the items (may be {@code null})
+		 * @return a built {@link ConditionMessage}
+		 */
+		public ConditionMessage items(Collection<?> items) {
+			return items(Style.NORMAL, items);
+		}
+
+		/**
+		 * Indicate the items. For example
+		 * {@code didNotFind("bean", "beans").items(Collections.singleton("x")} results in
+		 * the message "did not find bean x".
+		 * @param style the render style
+		 * @param items the source of the items (may be {@code null})
+		 * @return a built {@link ConditionMessage}
+		 */
+		public ConditionMessage items(Style style, Collection<?> items) {
+			Assert.notNull(style, "Style must not be null");
+			StringBuilder message = new StringBuilder(this.reson);
+			items = style.applyTo(items);
+			if ((this.condition == null || items.size() <= 1)
+					&& StringUtils.hasLength(this.singular)) {
+				message.append(" " + this.singular);
+			}
+			else if (StringUtils.hasLength(this.plural)) {
+				message.append(" " + this.plural);
+			}
+			if (items != null && !items.isEmpty()) {
+				message.append(
+						" " + StringUtils.collectionToDelimitedString(items, ", "));
+			}
+			return this.condition.because(message.toString());
+		}
+
+	}
+
+	/**
+	 * Render styles.
+	 */
+	public enum Style {
+
+		NORMAL {
+			@Override
+			protected Object applyToItem(Object item) {
+				return item;
+			}
+		},
+
+		QUOTE {
+			@Override
+			protected String applyToItem(Object item) {
+				return (item == null ? null : "'" + item + "'");
+			}
+		};
+
+		public Collection<?> applyTo(Collection<?> items) {
+			List<Object> result = new ArrayList<Object>();
+			for (Object item : items) {
+				result.add(applyToItem(item));
+			}
+			return result;
+		}
+
+		protected abstract Object applyToItem(Object item);
+
+	}
+
+}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/ConditionOutcome.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,20 +16,38 @@
 
 package org.springframework.boot.autoconfigure.condition;
 
+import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
 
 /**
  * Outcome for a condition match, including log message.
  *
  * @author Phillip Webb
+ * @see ConditionMessage
  */
 public class ConditionOutcome {
 
 	private final boolean match;
 
-	private final String message;
+	private final ConditionMessage message;
 
+	/**
+	 * Create a new {@link ConditionOutcome} instance. For more consistent messages
+	 * consider using {@link #ConditionOutcome(boolean, ConditionMessage)}.
+	 * @param match if the condition is a match
+	 * @param message the condition message
+	 */
 	public ConditionOutcome(boolean match, String message) {
+		this(match, ConditionMessage.of(message));
+	}
+
+	/**
+	 * Create a new {@link ConditionOutcome} instance.
+	 * @param match if the condition is a match
+	 * @param message the condition message
+	 */
+	public ConditionOutcome(boolean match, ConditionMessage message) {
+		Assert.notNull(message, "ConditionMessage must not be null");
 		this.match = match;
 		this.message = message;
 	}
@@ -39,11 +57,12 @@ public class ConditionOutcome {
 	 * @return the {@link ConditionOutcome}
 	 */
 	public static ConditionOutcome match() {
-		return match(null);
+		return match(ConditionMessage.empty());
 	}
 
 	/**
-	 * Create a new {@link ConditionOutcome} instance for 'match'.
+	 * Create a new {@link ConditionOutcome} instance for 'match'. For more consistent
+	 * messages consider using {@link #match(ConditionMessage)}.
 	 * @param message the message
 	 * @return the {@link ConditionOutcome}
 	 */
@@ -52,7 +71,17 @@ public class ConditionOutcome {
 	}
 
 	/**
-	 * Create a new {@link ConditionOutcome} instance for 'no match'.
+	 * Create a new {@link ConditionOutcome} instance for 'match'.
+	 * @param message the message
+	 * @return the {@link ConditionOutcome}
+	 */
+	public static ConditionOutcome match(ConditionMessage message) {
+		return new ConditionOutcome(true, message);
+	}
+
+	/**
+	 * Create a new {@link ConditionOutcome} instance for 'no match'. For more consistent
+	 * messages consider using {@link #noMatch(ConditionMessage)}.
 	 * @param message the message
 	 * @return the {@link ConditionOutcome}
 	 */
@@ -60,6 +89,15 @@ public class ConditionOutcome {
 		return new ConditionOutcome(false, message);
 	}
 
+	/**
+	 * Create a new {@link ConditionOutcome} instance for 'no match'.
+	 * @param message the message
+	 * @return the {@link ConditionOutcome}
+	 */
+	public static ConditionOutcome noMatch(ConditionMessage message) {
+		return new ConditionOutcome(false, message);
+	}
+
 	/**
 	 * Return {@code true} if the outcome was a match.
 	 * @return {@code true} if the outcome matches
@@ -73,6 +111,14 @@ public class ConditionOutcome {
 	 * @return the message or {@code null}
 	 */
 	public String getMessage() {
+		return (this.message.isEmpty() ? null : this.message.toString());
+	}
+
+	/**
+	 * Return an outcome message or {@code null}.
+	 * @return the message or {@code null}
+	 */
+	public ConditionMessage getConditionMessage() {
 		return this.message;
 	}
 
@@ -100,7 +146,7 @@ public class ConditionOutcome {
 
 	@Override
 	public String toString() {
-		return (this.message == null ? "" : this.message);
+		return (this.message == null ? "" : this.message.toString());
 	}
 
 	/**
@@ -110,7 +156,7 @@ public class ConditionOutcome {
 	 * @since 1.3.0
 	 */
 	public static ConditionOutcome inverse(ConditionOutcome outcome) {
-		return new ConditionOutcome(!outcome.isMatch(), outcome.getMessage());
+		return new ConditionOutcome(!outcome.isMatch(), outcome.getConditionMessage());
 	}
 
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/NoneNestedConditions.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,9 @@
 
 package org.springframework.boot.autoconfigure.condition;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import org.springframework.context.annotation.Condition;
 
 /**
@@ -47,10 +50,15 @@ public abstract class NoneNestedConditions extends AbstractNestedCondition {
 
 	@Override
 	protected ConditionOutcome getFinalMatchOutcome(MemberMatchOutcomes memberOutcomes) {
-		return new ConditionOutcome(memberOutcomes.getMatches().isEmpty(),
-				"nested none match resulted in " + memberOutcomes.getMatches()
-						+ " matches and " + memberOutcomes.getNonMatches()
-						+ " non matches");
+		boolean match = memberOutcomes.getMatches().isEmpty();
+		List<ConditionMessage> messages = new ArrayList<ConditionMessage>();
+		messages.add(ConditionMessage.forCondition("NoneNestedConditions")
+				.because(memberOutcomes.getMatches().size() + " matched "
+						+ memberOutcomes.getNonMatches().size() + " did not"));
+		for (ConditionOutcome outcome : memberOutcomes.getAll()) {
+			messages.add(outcome.getConditionMessage());
+		}
+		return new ConditionOutcome(match, ConditionMessage.of(messages));
 	}
 
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnBeanCondition.java

@@ -31,6 +31,7 @@ import org.springframework.beans.factory.HierarchicalBeanFactory;
 import org.springframework.beans.factory.ListableBeanFactory;
 import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage.Style;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Condition;
 import org.springframework.context.annotation.ConditionContext;
@@ -74,49 +75,52 @@ class OnBeanCondition extends SpringBootCondition implements ConfigurationCondit
 	@Override
 	public ConditionOutcome getMatchOutcome(ConditionContext context,
 			AnnotatedTypeMetadata metadata) {
-		StringBuilder matchMessage = new StringBuilder();
+		ConditionMessage matchMessage = ConditionMessage.empty();
 		if (metadata.isAnnotated(ConditionalOnBean.class.getName())) {
 			BeanSearchSpec spec = new BeanSearchSpec(context, metadata,
 					ConditionalOnBean.class);
 			List<String> matching = getMatchingBeans(context, spec);
 			if (matching.isEmpty()) {
-				return ConditionOutcome
-						.noMatch("@ConditionalOnBean " + spec + " found no beans");
+				return ConditionOutcome.noMatch(
+						ConditionMessage.forCondition(ConditionalOnBean.class, spec)
+								.didNotFind("any beans").atAll());
 			}
-			matchMessage.append("@ConditionalOnBean ").append(spec)
-					.append(" found the following ").append(matching);
+			matchMessage = matchMessage.andCondition(ConditionalOnBean.class, spec)
+					.found("bean", "beans").items(Style.QUOTE, matching);
 		}
 		if (metadata.isAnnotated(ConditionalOnSingleCandidate.class.getName())) {
 			BeanSearchSpec spec = new SingleCandidateBeanSearchSpec(context, metadata,
 					ConditionalOnSingleCandidate.class);
 			List<String> matching = getMatchingBeans(context, spec);
 			if (matching.isEmpty()) {
-				return ConditionOutcome.noMatch(
-						"@ConditionalOnSingleCandidate " + spec + " found no beans");
+				return ConditionOutcome.noMatch(ConditionMessage
+						.forCondition(ConditionalOnSingleCandidate.class, spec)
+						.didNotFind("any beans").atAll());
 			}
 			else if (!hasSingleAutowireCandidate(context.getBeanFactory(), matching,
 					spec.getStrategy() == SearchStrategy.ALL)) {
-				return ConditionOutcome.noMatch("@ConditionalOnSingleCandidate " + spec
-						+ " found no primary candidate amongst the" + " following "
-						+ matching);
+				return ConditionOutcome.noMatch(ConditionMessage
+						.forCondition(ConditionalOnSingleCandidate.class, spec)
+						.didNotFind("a primary bean from beans")
+						.items(Style.QUOTE, matching));
 			}
-			matchMessage.append("@ConditionalOnSingleCandidate ").append(spec)
-					.append(" found a primary candidate amongst the following ")
-					.append(matching);
+			matchMessage = matchMessage
+					.andCondition(ConditionalOnSingleCandidate.class, spec)
+					.found("a primary bean from beans").items(Style.QUOTE, matching);
 		}
 		if (metadata.isAnnotated(ConditionalOnMissingBean.class.getName())) {
 			BeanSearchSpec spec = new BeanSearchSpec(context, metadata,
 					ConditionalOnMissingBean.class);
 			List<String> matching = getMatchingBeans(context, spec);
 			if (!matching.isEmpty()) {
-				return ConditionOutcome.noMatch("@ConditionalOnMissingBean " + spec
-						+ " found the following " + matching);
+				return ConditionOutcome.noMatch(ConditionMessage
+						.forCondition(ConditionalOnMissingBean.class, spec)
+						.found("bean", "beans").items(Style.QUOTE, matching));
 			}
-			matchMessage.append(matchMessage.length() == 0 ? "" : " ");
-			matchMessage.append("@ConditionalOnMissingBean ").append(spec)
-					.append(" found no beans");
+			matchMessage = matchMessage.andCondition(ConditionalOnMissingBean.class, spec)
+					.didNotFind("any beans").atAll();
 		}
-		return ConditionOutcome.match(matchMessage.toString());
+		return ConditionOutcome.match(matchMessage);
 	}
 
 	private List<String> getMatchingBeans(ConditionContext context,

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnClassCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,6 +21,7 @@ import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
 
+import org.springframework.boot.autoconfigure.condition.ConditionMessage.Style;
 import org.springframework.context.annotation.Condition;
 import org.springframework.context.annotation.ConditionContext;
 import org.springframework.core.Ordered;
@@ -28,7 +29,6 @@ import org.springframework.core.annotation.Order;
 import org.springframework.core.type.AnnotatedTypeMetadata;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.MultiValueMap;
-import org.springframework.util.StringUtils;
 
 /**
  * {@link Condition} that checks for the presence or absence of specific classes.
@@ -43,9 +43,7 @@ class OnClassCondition extends SpringBootCondition {
 	@Override
 	public ConditionOutcome getMatchOutcome(ConditionContext context,
 			AnnotatedTypeMetadata metadata) {
-
-		StringBuilder matchMessage = new StringBuilder();
-
+		ConditionMessage matchMessage = ConditionMessage.empty();
 		MultiValueMap<String, Object> onClasses = getAttributes(metadata,
 				ConditionalOnClass.class);
 		if (onClasses != null) {
@@ -53,32 +51,31 @@ class OnClassCondition extends SpringBootCondition {
 					context);
 			if (!missing.isEmpty()) {
 				return ConditionOutcome
-						.noMatch("required @ConditionalOnClass classes not found: "
-								+ StringUtils.collectionToCommaDelimitedString(missing));
+						.noMatch(ConditionMessage.forCondition(ConditionalOnClass.class)
+								.didNotFind("required class", "required classes")
+								.items(Style.QUOTE, missing));
 			}
-			matchMessage.append("@ConditionalOnClass classes found: ")
-					.append(StringUtils.collectionToCommaDelimitedString(
-							getMatchingClasses(onClasses, MatchType.PRESENT, context)));
+			matchMessage = matchMessage.andCondition(ConditionalOnClass.class)
+					.found("required class", "required classes").items(Style.QUOTE,
+							getMatchingClasses(onClasses, MatchType.PRESENT, context));
 		}
-
 		MultiValueMap<String, Object> onMissingClasses = getAttributes(metadata,
 				ConditionalOnMissingClass.class);
 		if (onMissingClasses != null) {
 			List<String> present = getMatchingClasses(onMissingClasses, MatchType.PRESENT,
 					context);
 			if (!present.isEmpty()) {
-				return ConditionOutcome
-						.noMatch("required @ConditionalOnMissing classes found: "
-								+ StringUtils.collectionToCommaDelimitedString(present));
+				return ConditionOutcome.noMatch(
+						ConditionMessage.forCondition(ConditionalOnMissingClass.class)
+								.found("unwanted class", "unwanted classes")
+								.items(Style.QUOTE, present));
 			}
-			matchMessage.append(matchMessage.length() == 0 ? "" : " ");
-			matchMessage.append("@ConditionalOnMissing classes not found: ")
-					.append(StringUtils.collectionToCommaDelimitedString(
-							getMatchingClasses(onMissingClasses, MatchType.MISSING,
-									context)));
+			matchMessage = matchMessage.andCondition(ConditionalOnMissingClass.class)
+					.didNotFind("unwanted class", "unwanted classes")
+					.items(Style.QUOTE, getMatchingClasses(onMissingClasses,
+							MatchType.MISSING, context));
 		}
-
-		return ConditionOutcome.match(matchMessage.toString());
+		return ConditionOutcome.match(matchMessage);
 	}
 
 	private MultiValueMap<String, Object> getAttributes(AnnotatedTypeMetadata metadata,
@@ -111,17 +108,21 @@ class OnClassCondition extends SpringBootCondition {
 	private enum MatchType {
 
 		PRESENT {
+
 			@Override
 			public boolean matches(String className, ConditionContext context) {
 				return ClassUtils.isPresent(className, context.getClassLoader());
 			}
+
 		},
 
 		MISSING {
+
 			@Override
 			public boolean matches(String className, ConditionContext context) {
 				return !ClassUtils.isPresent(className, context.getClassLoader());
 			}
+
 		};
 
 		public abstract boolean matches(String className, ConditionContext context);

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnExpressionCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2013 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,7 +24,6 @@ import org.springframework.context.expression.StandardBeanExpressionResolver;
 import org.springframework.core.Ordered;
 import org.springframework.core.annotation.Order;
 import org.springframework.core.type.AnnotatedTypeMetadata;
-import org.springframework.core.type.ClassMetadata;
 
 /**
  * A Condition that evaluates a SpEL expression.
@@ -38,17 +37,11 @@ class OnExpressionCondition extends SpringBootCondition {
 	@Override
 	public ConditionOutcome getMatchOutcome(ConditionContext context,
 			AnnotatedTypeMetadata metadata) {
-
 		String expression = (String) metadata
 				.getAnnotationAttributes(ConditionalOnExpression.class.getName())
 				.get("value");
+		expression = wrapIfNecessary(expression);
 		String rawExpression = expression;
-		if (!expression.startsWith("#{")) {
-			// For convenience allow user to provide bare expression with no #{} wrapper
-			expression = "#{" + expression + "}";
-		}
-
-		// Explicitly allow environment placeholders inside the expression
 		expression = context.getEnvironment().resolvePlaceholders(expression);
 		ConfigurableListableBeanFactory beanFactory = context.getBeanFactory();
 		BeanExpressionResolver resolver = (beanFactory != null)
@@ -59,13 +52,21 @@ class OnExpressionCondition extends SpringBootCondition {
 			resolver = new StandardBeanExpressionResolver();
 		}
 		boolean result = (Boolean) resolver.evaluate(expression, expressionContext);
+		return new ConditionOutcome(result, ConditionMessage
+				.forCondition(ConditionalOnExpression.class, "(" + rawExpression + ")")
+				.resultedIn(result));
+	}
 
-		StringBuilder message = new StringBuilder("SpEL expression");
-		if (metadata instanceof ClassMetadata) {
-			message.append(" on " + ((ClassMetadata) metadata).getClassName());
+	/**
+	 * Allow user to provide bare expression with no '#{}' wrapper.
+	 * @param expression source expression
+	 * @return wrapped expression
+	 */
+	private String wrapIfNecessary(String expression) {
+		if (!expression.startsWith("#{")) {
+			return "#{" + expression + "}";
 		}
-		message.append(": " + rawExpression);
-		return new ConditionOutcome(result, message.toString());
+		return expression;
 	}
 
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnJavaCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2014 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -52,13 +52,13 @@ class OnJavaCondition extends SpringBootCondition {
 	protected ConditionOutcome getMatchOutcome(Range range, JavaVersion runningVersion,
 			JavaVersion version) {
 		boolean match = runningVersion.isWithin(range, version);
-		return new ConditionOutcome(match, getMessage(range, runningVersion, version));
+		String expected = String.format(
+				range == Range.EQUAL_OR_NEWER ? "(%s or newer)" : "(older than %s)",
+				version);
+		ConditionMessage message = ConditionMessage
+				.forCondition(ConditionalOnJava.class, expected)
+				.foundExactly(runningVersion);
+		return new ConditionOutcome(match, message);
 	}
 
-	private String getMessage(Range range, JavaVersion runningVersion,
-			JavaVersion version) {
-		String expected = String.format(
-				range == Range.EQUAL_OR_NEWER ? "%s or newer" : "older than %s", version);
-		return "Required JVM version " + expected + " found " + runningVersion;
-	}
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnJndiCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2014 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -48,26 +48,33 @@ class OnJndiCondition extends SpringBootCondition {
 			return getMatchOutcome(locations);
 		}
 		catch (NoClassDefFoundError ex) {
-			return ConditionOutcome.noMatch("JNDI class not found");
+			return ConditionOutcome
+					.noMatch(ConditionMessage.forCondition(ConditionalOnJndi.class)
+							.because("JNDI class not found"));
 		}
 	}
 
 	private ConditionOutcome getMatchOutcome(String[] locations) {
 		if (!isJndiAvailable()) {
-			return ConditionOutcome.noMatch("JNDI environment is not available");
+			return ConditionOutcome
+					.noMatch(ConditionMessage.forCondition(ConditionalOnJndi.class)
+							.notAvailable("JNDI environment"));
 		}
 		if (locations.length == 0) {
-			return ConditionOutcome.match("JNDI environment is available");
+			return ConditionOutcome.match(ConditionMessage
+					.forCondition(ConditionalOnJndi.class).available("JNDI environment"));
 		}
 		JndiLocator locator = getJndiLocator(locations);
 		String location = locator.lookupFirstLocation();
+		String details = "(" + StringUtils.arrayToCommaDelimitedString(locations) + ")";
 		if (location != null) {
 			return ConditionOutcome
-					.match("JNDI location '" + location + "' found from candidates "
-							+ StringUtils.arrayToCommaDelimitedString(locations));
+					.match(ConditionMessage.forCondition(ConditionalOnJndi.class, details)
+							.foundExactly("\"" + location + "\""));
 		}
-		return ConditionOutcome.noMatch("No JNDI location found from candidates "
-				+ StringUtils.arrayToCommaDelimitedString(locations));
+		return ConditionOutcome
+				.noMatch(ConditionMessage.forCondition(ConditionalOnJndi.class, details)
+						.didNotFind("any matching JNDI location").atAll());
 	}
 
 	protected boolean isJndiAvailable() {

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnPropertyCondition.java

@@ -22,6 +22,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 
+import org.springframework.boot.autoconfigure.condition.ConditionMessage.Style;
 import org.springframework.boot.bind.RelaxedPropertyResolver;
 import org.springframework.context.annotation.Condition;
 import org.springframework.context.annotation.ConditionContext;
@@ -50,12 +51,17 @@ class OnPropertyCondition extends SpringBootCondition {
 		List<AnnotationAttributes> allAnnotationAttributes = annotationAttributesFromMultiValueMap(
 				metadata.getAllAnnotationAttributes(
 						ConditionalOnProperty.class.getName()));
-		List<ConditionOutcome> noMatchOutcomes = findNoMatchOutcomes(
-				allAnnotationAttributes, context.getEnvironment());
-		if (noMatchOutcomes.isEmpty()) {
-			return ConditionOutcome.match();
+		List<ConditionMessage> noMatch = new ArrayList<ConditionMessage>();
+		List<ConditionMessage> match = new ArrayList<ConditionMessage>();
+		for (AnnotationAttributes annotationAttributes : allAnnotationAttributes) {
+			ConditionOutcome outcome = determineOutcome(annotationAttributes,
+					context.getEnvironment());
+			(outcome.isMatch() ? match : noMatch).add(outcome.getConditionMessage());
 		}
-		return ConditionOutcome.noMatch(getCompositeMessage(noMatchOutcomes));
+		if (!noMatch.isEmpty()) {
+			return ConditionOutcome.noMatch(ConditionMessage.of(noMatch));
+		}
+		return ConditionOutcome.match(ConditionMessage.of(match));
 	}
 
 	private List<AnnotationAttributes> annotationAttributesFromMultiValueMap(
@@ -82,104 +88,110 @@ class OnPropertyCondition extends SpringBootCondition {
 		return annotationAttributes;
 	}
 
-	private List<ConditionOutcome> findNoMatchOutcomes(
-			List<AnnotationAttributes> allAnnotationAttributes,
-			PropertyResolver resolver) {
-		List<ConditionOutcome> noMatchOutcomes = new ArrayList<ConditionOutcome>(
-				allAnnotationAttributes.size());
-		for (AnnotationAttributes annotationAttributes : allAnnotationAttributes) {
-			ConditionOutcome outcome = determineOutcome(annotationAttributes, resolver);
-			if (!outcome.isMatch()) {
-				noMatchOutcomes.add(outcome);
-			}
-		}
-		return noMatchOutcomes;
-	}
-
 	private ConditionOutcome determineOutcome(AnnotationAttributes annotationAttributes,
 			PropertyResolver resolver) {
-		String prefix = annotationAttributes.getString("prefix").trim();
-		if (StringUtils.hasText(prefix) && !prefix.endsWith(".")) {
-			prefix = prefix + ".";
-		}
-		String havingValue = annotationAttributes.getString("havingValue");
-		String[] names = getNames(annotationAttributes);
-		boolean relaxedNames = annotationAttributes.getBoolean("relaxedNames");
-		boolean matchIfMissing = annotationAttributes.getBoolean("matchIfMissing");
-
-		if (relaxedNames) {
-			resolver = new RelaxedPropertyResolver(resolver, prefix);
-		}
-
+		Spec spec = new Spec(annotationAttributes);
 		List<String> missingProperties = new ArrayList<String>();
 		List<String> nonMatchingProperties = new ArrayList<String>();
-		for (String name : names) {
-			String key = (relaxedNames ? name : prefix + name);
-			if (resolver.containsProperty(key)) {
-				if (!isMatch(resolver.getProperty(key), havingValue)) {
-					nonMatchingProperties.add(name);
-				}
-			}
-			else {
-				if (!matchIfMissing) {
-					missingProperties.add(name);
-				}
-			}
-		}
-
-		if (missingProperties.isEmpty() && nonMatchingProperties.isEmpty()) {
-			return ConditionOutcome.match();
-		}
-
-		StringBuilder message = new StringBuilder("@ConditionalOnProperty ");
+		spec.collectProperties(resolver, missingProperties, nonMatchingProperties);
 		if (!missingProperties.isEmpty()) {
-			message.append("missing required properties ")
-					.append(expandNames(prefix, missingProperties)).append(" ");
+			return ConditionOutcome.noMatch(
+					ConditionMessage.forCondition(ConditionalOnProperty.class, spec)
+							.didNotFind("property", "properties")
+							.items(Style.QUOTE, missingProperties));
 		}
 		if (!nonMatchingProperties.isEmpty()) {
-			String expected = StringUtils.hasLength(havingValue) ? havingValue : "!false";
-			message.append("expected '").append(expected).append("' for properties ")
-					.append(expandNames(prefix, nonMatchingProperties));
+			return ConditionOutcome.noMatch(
+					ConditionMessage.forCondition(ConditionalOnProperty.class, spec)
+							.found("different value in property",
+									"different value in properties")
+					.items(Style.QUOTE, nonMatchingProperties));
 		}
-		return ConditionOutcome.noMatch(message.toString());
+		return ConditionOutcome.match(ConditionMessage
+				.forCondition(ConditionalOnProperty.class, spec).because("matched"));
 	}
 
-	private String[] getNames(Map<String, Object> annotationAttributes) {
-		String[] value = (String[]) annotationAttributes.get("value");
-		String[] name = (String[]) annotationAttributes.get("name");
-		Assert.state(value.length > 0 || name.length > 0,
-				"The name or value attribute of @ConditionalOnProperty must be specified");
-		Assert.state(value.length == 0 || name.length == 0,
-				"The name and value attributes of @ConditionalOnProperty are exclusive");
-		return (value.length > 0 ? value : name);
-	}
+	private static class Spec {
 
-	private boolean isMatch(String value, String requiredValue) {
-		if (StringUtils.hasLength(requiredValue)) {
-			return requiredValue.equalsIgnoreCase(value);
-		}
-		return !"false".equalsIgnoreCase(value);
-	}
+		private final String prefix;
 
-	private String expandNames(String prefix, List<String> names) {
-		StringBuilder expanded = new StringBuilder();
-		for (String name : names) {
-			expanded.append(expanded.length() == 0 ? "" : ", ");
-			expanded.append(prefix);
-			expanded.append(name);
-		}
-		return expanded.toString();
-	}
+		private final String havingValue;
 
-	private String getCompositeMessage(List<ConditionOutcome> noMatchOutcomes) {
-		StringBuilder message = new StringBuilder();
-		for (ConditionOutcome noMatchOutcome : noMatchOutcomes) {
-			if (message.length() > 0) {
-				message.append(". ");
+		private final String[] names;
+
+		private final boolean relaxedNames;
+
+		private final boolean matchIfMissing;
+
+		Spec(AnnotationAttributes annotationAttributes) {
+			String prefix = annotationAttributes.getString("prefix").trim();
+			if (StringUtils.hasText(prefix) && !prefix.endsWith(".")) {
+				prefix = prefix + ".";
 			}
-			message.append(noMatchOutcome.getMessage().trim());
+			this.prefix = prefix;
+			this.havingValue = annotationAttributes.getString("havingValue");
+			this.names = getNames(annotationAttributes);
+			this.relaxedNames = annotationAttributes.getBoolean("relaxedNames");
+			this.matchIfMissing = annotationAttributes.getBoolean("matchIfMissing");
 		}
-		return message.toString();
+
+		private String[] getNames(Map<String, Object> annotationAttributes) {
+			String[] value = (String[]) annotationAttributes.get("value");
+			String[] name = (String[]) annotationAttributes.get("name");
+			Assert.state(value.length > 0 || name.length > 0,
+					"The name or value attribute of @ConditionalOnProperty must be specified");
+			Assert.state(value.length == 0 || name.length == 0,
+					"The name and value attributes of @ConditionalOnProperty are exclusive");
+			return (value.length > 0 ? value : name);
+		}
+
+		private void collectProperties(PropertyResolver resolver, List<String> missing,
+				List<String> nonMatching) {
+			if (this.relaxedNames) {
+				resolver = new RelaxedPropertyResolver(resolver, this.prefix);
+			}
+			for (String name : this.names) {
+				String key = (this.relaxedNames ? name : this.prefix + name);
+				if (resolver.containsProperty(key)) {
+					if (!isMatch(resolver.getProperty(key), this.havingValue)) {
+						nonMatching.add(name);
+					}
+				}
+				else {
+					if (!this.matchIfMissing) {
+						missing.add(name);
+					}
+				}
+			}
+		}
+
+		private boolean isMatch(String value, String requiredValue) {
+			if (StringUtils.hasLength(requiredValue)) {
+				return requiredValue.equalsIgnoreCase(value);
+			}
+			return !"false".equalsIgnoreCase(value);
+		}
+
+		@Override
+		public String toString() {
+			StringBuilder result = new StringBuilder();
+			result.append("(");
+			result.append(this.prefix);
+			if (this.names.length == 1) {
+				result.append(this.names[0]);
+			}
+			else {
+				result.append("[");
+				result.append(StringUtils.arrayToCommaDelimitedString(this.names));
+				result.append("]");
+			}
+			if (StringUtils.hasLength(this.havingValue)) {
+				result.append("=").append(this.havingValue);
+			}
+			result.append(")");
+			return result.toString();
+		}
+
 	}
 
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnResourceCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,7 @@ package org.springframework.boot.autoconfigure.condition;
 import java.util.ArrayList;
 import java.util.List;
 
+import org.springframework.boot.autoconfigure.condition.ConditionMessage.Style;
 import org.springframework.context.annotation.Condition;
 import org.springframework.context.annotation.ConditionContext;
 import org.springframework.core.io.DefaultResourceLoader;
@@ -42,23 +43,28 @@ class OnResourceCondition extends SpringBootCondition {
 			AnnotatedTypeMetadata metadata) {
 		MultiValueMap<String, Object> attributes = metadata
 				.getAllAnnotationAttributes(ConditionalOnResource.class.getName(), true);
-		if (attributes != null) {
-			ResourceLoader loader = context.getResourceLoader() == null
-					? this.defaultResourceLoader : context.getResourceLoader();
-			List<String> locations = new ArrayList<String>();
-			collectValues(locations, attributes.get("resources"));
-			Assert.isTrue(!locations.isEmpty(),
-					"@ConditionalOnResource annotations must specify at least one resource location");
-			for (String location : locations) {
-				if (!loader
-						.getResource(
-								context.getEnvironment().resolvePlaceholders(location))
-						.exists()) {
-					return ConditionOutcome.noMatch("resource not found: " + location);
-				}
+		ResourceLoader loader = context.getResourceLoader() == null
+				? this.defaultResourceLoader : context.getResourceLoader();
+		List<String> locations = new ArrayList<String>();
+		collectValues(locations, attributes.get("resources"));
+		Assert.isTrue(!locations.isEmpty(),
+				"@ConditionalOnResource annotations must specify at "
+						+ "least one resource location");
+		List<String> missing = new ArrayList<String>();
+		for (String location : locations) {
+			String resouce = context.getEnvironment().resolvePlaceholders(location);
+			if (!loader.getResource(resouce).exists()) {
+				missing.add(location);
 			}
 		}
-		return ConditionOutcome.match();
+		if (!missing.isEmpty()) {
+			return ConditionOutcome.noMatch(ConditionMessage
+					.forCondition(ConditionalOnResource.class)
+					.didNotFind("resource", "resources").items(Style.QUOTE, missing));
+		}
+		return ConditionOutcome
+				.match(ConditionMessage.forCondition(ConditionalOnResource.class)
+						.found("location", "locations").items(locations));
 	}
 
 	private void collectValues(List<String> names, List<Object> values) {

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnWebApplicationCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2014 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -43,45 +43,40 @@ class OnWebApplicationCondition extends SpringBootCondition {
 	@Override
 	public ConditionOutcome getMatchOutcome(ConditionContext context,
 			AnnotatedTypeMetadata metadata) {
-		boolean webApplicationRequired = metadata
+		boolean required = metadata
 				.isAnnotated(ConditionalOnWebApplication.class.getName());
-		ConditionOutcome webApplication = isWebApplication(context, metadata);
-
-		if (webApplicationRequired && !webApplication.isMatch()) {
-			return ConditionOutcome.noMatch(webApplication.getMessage());
+		ConditionOutcome outcome = isWebApplication(context, metadata, required);
+		if (required && !outcome.isMatch()) {
+			return ConditionOutcome.noMatch(outcome.getConditionMessage());
 		}
-
-		if (!webApplicationRequired && webApplication.isMatch()) {
-			return ConditionOutcome.noMatch(webApplication.getMessage());
+		if (!required && outcome.isMatch()) {
+			return ConditionOutcome.noMatch(outcome.getConditionMessage());
 		}
-
-		return ConditionOutcome.match(webApplication.getMessage());
+		return ConditionOutcome.match(outcome.getConditionMessage());
 	}
 
 	private ConditionOutcome isWebApplication(ConditionContext context,
-			AnnotatedTypeMetadata metadata) {
-
+			AnnotatedTypeMetadata metadata, boolean required) {
+		ConditionMessage.Builder message = ConditionMessage.forCondition(
+				ConditionalOnWebApplication.class, required ? "(required)" : "");
 		if (!ClassUtils.isPresent(WEB_CONTEXT_CLASS, context.getClassLoader())) {
-			return ConditionOutcome.noMatch("web application classes not found");
+			return ConditionOutcome
+					.noMatch(message.didNotFind("web application classes").atAll());
 		}
-
 		if (context.getBeanFactory() != null) {
 			String[] scopes = context.getBeanFactory().getRegisteredScopeNames();
 			if (ObjectUtils.containsElement(scopes, "session")) {
-				return ConditionOutcome.match("found web application 'session' scope");
+				return ConditionOutcome.match(message.foundExactly("'session' scope"));
 			}
 		}
-
 		if (context.getEnvironment() instanceof StandardServletEnvironment) {
 			return ConditionOutcome
-					.match("found web application StandardServletEnvironment");
+					.match(message.foundExactly("StandardServletEnvironment"));
 		}
-
 		if (context.getResourceLoader() instanceof WebApplicationContext) {
-			return ConditionOutcome.match("found web application WebApplicationContext");
+			return ConditionOutcome.match(message.foundExactly("WebApplicationContext"));
 		}
-
-		return ConditionOutcome.noMatch("not a web application");
+		return ConditionOutcome.noMatch(message.because("not a web application"));
 	}
 
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/ResourceCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,12 @@
 
 package org.springframework.boot.autoconfigure.condition;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.springframework.boot.autoconfigure.condition.ConditionMessage.Builder;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage.Style;
 import org.springframework.boot.bind.RelaxedPropertyResolver;
 import org.springframework.context.annotation.ConditionContext;
 import org.springframework.core.io.Resource;
@@ -61,8 +67,8 @@ public abstract class ResourceCondition extends SpringBootCondition {
 		RelaxedPropertyResolver resolver = new RelaxedPropertyResolver(
 				context.getEnvironment(), this.prefix);
 		if (resolver.containsProperty(this.propertyName)) {
-			return ConditionOutcome.match("A '" + this.prefix + this.propertyName + "' "
-					+ "property is specified");
+			return ConditionOutcome.match(startConditionMessage()
+					.foundExactly("property " + this.prefix + this.propertyName));
 		}
 		return getResourceOutcome(context, metadata);
 	}
@@ -75,15 +81,26 @@ public abstract class ResourceCondition extends SpringBootCondition {
 	 */
 	protected ConditionOutcome getResourceOutcome(ConditionContext context,
 			AnnotatedTypeMetadata metadata) {
+		List<String> found = new ArrayList<String>();
 		for (String location : this.resourceLocations) {
 			Resource resource = context.getResourceLoader().getResource(location);
 			if (resource != null && resource.exists()) {
-				return ConditionOutcome
-						.match("Found " + this.name + " config in " + resource);
+				found.add(location);
 			}
 		}
-		return ConditionOutcome
-				.noMatch("No specific " + this.name + " configuration found");
+		if (found.isEmpty()) {
+			ConditionMessage message = startConditionMessage()
+					.didNotFind("resource", "resources")
+					.items(Style.QUOTE, Arrays.asList(this.resourceLocations));
+			return ConditionOutcome.noMatch(message);
+		}
+		ConditionMessage message = startConditionMessage().found("resource", "resources")
+				.items(Style.QUOTE, found);
+		return ConditionOutcome.match(message);
+	}
+
+	protected final Builder startConditionMessage() {
+		return ConditionMessage.forCondition("ResourceCondition", "(" + this.name + ")");
 	}
 
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/hazelcast/HazelcastConfigResourceCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -43,8 +43,8 @@ public abstract class HazelcastConfigResourceCondition extends ResourceCondition
 	protected ConditionOutcome getResourceOutcome(ConditionContext context,
 			AnnotatedTypeMetadata metadata) {
 		if (System.getProperty(CONFIG_SYSTEM_PROPERTY) != null) {
-			return ConditionOutcome
-					.match("System property '" + CONFIG_SYSTEM_PROPERTY + "' is set.");
+			return ConditionOutcome.match(startConditionMessage()
+					.because("System property '" + CONFIG_SYSTEM_PROPERTY + "' is set."));
 		}
 		return super.getResourceOutcome(context, metadata);
 	}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/info/ProjectInfoAutoConfiguration.java

@@ -20,6 +20,7 @@ import java.io.IOException;
 import java.util.Properties;
 
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnResource;
@@ -104,9 +105,13 @@ public class ProjectInfoAutoConfiguration {
 					location = "classpath:git.properties";
 				}
 			}
-			boolean match = loader.getResource(location).exists();
-			return new ConditionOutcome(match,
-					"Git info " + (match ? "found" : "not found") + " at " + location);
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("GitResource");
+			if (loader.getResource(location).exists()) {
+				return ConditionOutcome.match(message.found("git info at").items(location));
+			}
+			return ConditionOutcome
+					.noMatch(message.didNotFind("git info at").items(location));
 		}
 
 	}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration.java

@@ -31,6 +31,7 @@ import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.AnyNestedCondition;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
@@ -156,10 +157,14 @@ public class DataSourceAutoConfiguration {
 		@Override
 		public ConditionOutcome getMatchOutcome(ConditionContext context,
 				AnnotatedTypeMetadata metadata) {
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("PooledDataSource");
 			if (getDataSourceClassLoader(context) != null) {
-				return ConditionOutcome.match("supported DataSource class found");
+				return ConditionOutcome
+						.match(message.foundExactly("supported DataSource"));
 			}
-			return ConditionOutcome.noMatch("missing supported DataSource");
+			return ConditionOutcome
+					.noMatch(message.didNotFind("supported DataSource").atAll());
 		}
 
 		/**
@@ -187,15 +192,19 @@ public class DataSourceAutoConfiguration {
 		@Override
 		public ConditionOutcome getMatchOutcome(ConditionContext context,
 				AnnotatedTypeMetadata metadata) {
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("EmbeddedDataSource");
 			if (anyMatches(context, metadata, this.pooledCondition)) {
-				return ConditionOutcome.noMatch("supported DataSource class found");
+				return ConditionOutcome
+						.noMatch(message.foundExactly("supported pooled data source"));
 			}
 			EmbeddedDatabaseType type = EmbeddedDatabaseConnection
 					.get(context.getClassLoader()).getType();
 			if (type == null) {
-				return ConditionOutcome.noMatch("no embedded database detected");
+				return ConditionOutcome
+						.noMatch(message.didNotFind("embedded database").atAll());
 			}
-			return ConditionOutcome.match("embedded database " + type + " detected");
+			return ConditionOutcome.match(message.found("embedded database").items(type));
 		}
 
 	}
@@ -214,16 +223,20 @@ public class DataSourceAutoConfiguration {
 		@Override
 		public ConditionOutcome getMatchOutcome(ConditionContext context,
 				AnnotatedTypeMetadata metadata) {
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("EmbeddedDataAvailble");
 			if (hasBean(context, DataSource.class)
 					|| hasBean(context, XADataSource.class)) {
 				return ConditionOutcome
-						.match("existing bean configured database detected");
+						.match(message.foundExactly("existing database bean"));
 			}
 			if (anyMatches(context, metadata, this.pooledCondition,
 					this.embeddedCondition)) {
-				return ConditionOutcome.match("existing auto database detected");
+				return ConditionOutcome
+						.match(message.foundExactly("existing auto-configured database"));
 			}
-			return ConditionOutcome.noMatch("no existing bean configured database");
+			return ConditionOutcome
+					.noMatch(message.didNotFind("any existing data source bean").atAll());
 		}
 
 		private boolean hasBean(ConditionContext context, Class<?> type) {

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/logging/ConditionEvaluationReportMessage.java

@@ -116,8 +116,9 @@ public class ConditionEvaluationReportMessage {
 				.append(String.format("%n"));
 		for (ConditionAndOutcome conditionAndOutcome : conditionAndOutcomes) {
 			message.append("      - ");
-			if (StringUtils.hasLength(conditionAndOutcome.getOutcome().getMessage())) {
-				message.append(conditionAndOutcome.getOutcome().getMessage());
+			String outcomeMessage = conditionAndOutcome.getOutcome().getMessage();
+			if (StringUtils.hasLength(outcomeMessage)) {
+				message.append(outcomeMessage);
 			}
 			else {
 				message.append(conditionAndOutcome.getOutcome().isMatch() ? "matched"

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.java

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.autoconfigure.orm.jpa;
 
+import java.util.Arrays;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
@@ -28,6 +29,8 @@ import org.apache.commons.logging.LogFactory;
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage.Style;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
@@ -199,13 +202,18 @@ public class HibernateJpaAutoConfiguration extends JpaBaseConfiguration {
 		@Override
 		public ConditionOutcome getMatchOutcome(ConditionContext context,
 				AnnotatedTypeMetadata metadata) {
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("HibernateEntityManager");
 			for (String className : CLASS_NAMES) {
 				if (ClassUtils.isPresent(className, context.getClassLoader())) {
-					return ConditionOutcome.match("found HibernateEntityManager class");
+					return ConditionOutcome
+							.match(message.found("class").items(Style.QUOTE, className));
 				}
 			}
-			return ConditionOutcome.noMatch("did not find HibernateEntityManager class");
+			return ConditionOutcome.noMatch(message.didNotFind("class", "classes")
+					.items(Style.QUOTE, Arrays.asList(CLASS_NAMES)));
 		}
+
 	}
 
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/client/EnableOAuth2SsoCondition.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.security.oauth2.client;
+
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
+import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
+import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
+import org.springframework.context.annotation.ConditionContext;
+import org.springframework.core.type.AnnotatedTypeMetadata;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+
+/**
+ * Condition that checks for {@link EnableOAuth2Sso} on a
+ * {@link WebSecurityConfigurerAdapter}.
+ *
+ * @author Dave Syer
+ */
+class EnableOAuth2SsoCondition extends SpringBootCondition {
+
+	@Override
+	public ConditionOutcome getMatchOutcome(ConditionContext context,
+			AnnotatedTypeMetadata metadata) {
+		String[] enablers = context.getBeanFactory()
+				.getBeanNamesForAnnotation(EnableOAuth2Sso.class);
+		ConditionMessage.Builder message = ConditionMessage
+				.forCondition("@EnableOAuth2Sso Condition");
+		for (String name : enablers) {
+			if (context.getBeanFactory().isTypeMatch(name,
+					WebSecurityConfigurerAdapter.class)) {
+				return ConditionOutcome.match(message
+						.found("@EnableOAuth2Sso annotation on WebSecurityConfigurerAdapter")
+						.items(name));
+			}
+		}
+		return ConditionOutcome.noMatch(message.didNotFind(
+				"@EnableOAuth2Sso annotation " + "on any WebSecurityConfigurerAdapter")
+				.atAll());
+	}
+
+}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/client/OAuth2RestOperationsConfiguration.java

@@ -19,6 +19,7 @@ package org.springframework.boot.autoconfigure.security.oauth2.client;
 import javax.annotation.Resource;
 
 import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
@@ -161,8 +162,14 @@ public class OAuth2RestOperationsConfiguration {
 			PropertyResolver resolver = new RelaxedPropertyResolver(
 					context.getEnvironment(), "security.oauth2.client.");
 			String clientId = resolver.getProperty("client-id");
-			return new ConditionOutcome(StringUtils.hasLength(clientId),
-					"Non empty security.oauth2.client.client-id");
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("OAuth Client ID");
+			if (StringUtils.hasLength(clientId)) {
+				return ConditionOutcome.match(message
+						.foundExactly("security.oauth2.client.client-id property"));
+			}
+			return ConditionOutcome.match(message
+					.didNotFind("security.oauth2.client.client-id property").atAll());
 		}
 
 	}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/client/OAuth2SsoCustomConfiguration.java

@@ -24,16 +24,11 @@ import org.aopalliance.intercept.MethodInvocation;
 import org.springframework.aop.framework.ProxyFactory;
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.config.BeanPostProcessor;
-import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
-import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
-import org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2SsoCustomConfiguration.WebSecurityEnhancerCondition;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationContextAware;
-import org.springframework.context.annotation.ConditionContext;
 import org.springframework.context.annotation.Conditional;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.ImportAware;
-import org.springframework.core.type.AnnotatedTypeMetadata;
 import org.springframework.core.type.AnnotationMetadata;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
@@ -49,7 +44,7 @@ import org.springframework.util.ReflectionUtils;
  * @author Dave Syer
  */
 @Configuration
-@Conditional(WebSecurityEnhancerCondition.class)
+@Conditional(EnableOAuth2SsoCondition.class)
 public class OAuth2SsoCustomConfiguration
 		implements ImportAware, BeanPostProcessor, ApplicationContextAware {
 
@@ -111,24 +106,4 @@ public class OAuth2SsoCustomConfiguration
 
 	}
 
-	protected static class WebSecurityEnhancerCondition extends SpringBootCondition {
-
-		@Override
-		public ConditionOutcome getMatchOutcome(ConditionContext context,
-				AnnotatedTypeMetadata metadata) {
-			String[] enablers = context.getBeanFactory()
-					.getBeanNamesForAnnotation(EnableOAuth2Sso.class);
-			for (String name : enablers) {
-				if (context.getBeanFactory().isTypeMatch(name,
-						WebSecurityConfigurerAdapter.class)) {
-					return ConditionOutcome.match(
-							"found @EnableOAuth2Sso on a WebSecurityConfigurerAdapter");
-				}
-			}
-			return ConditionOutcome.noMatch(
-					"found no @EnableOAuth2Sso on a WebSecurityConfigurerAdapter");
-		}
-
-	}
-
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/client/OAuth2SsoDefaultConfiguration.java

@@ -17,7 +17,6 @@
 package org.springframework.boot.autoconfigure.security.oauth2.client;
 
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
-import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
 import org.springframework.boot.autoconfigure.security.SecurityProperties;
 import org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2SsoDefaultConfiguration.NeedsWebSecurityCondition;
 import org.springframework.context.ApplicationContext;
@@ -75,22 +74,12 @@ public class OAuth2SsoDefaultConfiguration extends WebSecurityConfigurerAdapter
 		return SecurityProperties.ACCESS_OVERRIDE_ORDER;
 	}
 
-	protected static class NeedsWebSecurityCondition extends SpringBootCondition {
+	protected static class NeedsWebSecurityCondition extends EnableOAuth2SsoCondition {
 
 		@Override
 		public ConditionOutcome getMatchOutcome(ConditionContext context,
 				AnnotatedTypeMetadata metadata) {
-			String[] enablers = context.getBeanFactory()
-					.getBeanNamesForAnnotation(EnableOAuth2Sso.class);
-			for (String name : enablers) {
-				if (context.getBeanFactory().isTypeMatch(name,
-						WebSecurityConfigurerAdapter.class)) {
-					return ConditionOutcome.noMatch(
-							"found @EnableOAuth2Sso on a WebSecurityConfigurerAdapter");
-				}
-			}
-			return ConditionOutcome
-					.match("found no @EnableOAuth2Sso on a WebSecurityConfigurerAdapter");
+			return ConditionOutcome.inverse(super.getMatchOutcome(context, metadata));
 		}
 
 	}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/resource/OAuth2ResourceServerConfiguration.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.autoconfigure.security.oauth2.resource;
 
 import org.springframework.beans.BeanUtils;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
@@ -112,28 +113,32 @@ public class OAuth2ResourceServerConfiguration {
 		@Override
 		public ConditionOutcome getMatchOutcome(ConditionContext context,
 				AnnotatedTypeMetadata metadata) {
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("OAuth ResourceServer Condition");
 			Environment environment = context.getEnvironment();
 			RelaxedPropertyResolver resolver = new RelaxedPropertyResolver(environment,
 					"security.oauth2.resource.");
 			if (hasOAuthClientId(environment)) {
-				return ConditionOutcome.match("found client id");
+				return ConditionOutcome.match(message.foundExactly("client-id property"));
 			}
 			if (!resolver.getSubProperties("jwt").isEmpty()) {
-				return ConditionOutcome.match("found JWT resource configuration");
+				return ConditionOutcome
+						.match(message.foundExactly("JWT resource configuration"));
 			}
 			if (StringUtils.hasText(resolver.getProperty("user-info-uri"))) {
 				return ConditionOutcome
-						.match("found UserInfo " + "URI resource configuration");
+						.match(message.foundExactly("user-info-url property"));
 			}
 			if (ClassUtils.isPresent(AUTHORIZATION_ANNOTATION, null)) {
 				if (AuthorizationServerEndpointsConfigurationBeanCondition
 						.matches(context)) {
-					return ConditionOutcome.match(
-							"found authorization " + "server endpoints configuration");
+					return ConditionOutcome
+							.match(message.found("class").items(AUTHORIZATION_ANNOTATION));
 				}
 			}
-			return ConditionOutcome.noMatch("found neither client id nor "
-					+ "JWT resource nor authorization server");
+			return ConditionOutcome.noMatch(
+					message.didNotFind("client id, JWT resource or authorization server")
+							.atAll());
 		}
 
 		private boolean hasOAuthClientId(Environment environment) {

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/resource/ResourceServerTokenServicesConfiguration.java

@@ -25,6 +25,7 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
 import org.springframework.beans.factory.ObjectProvider;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
@@ -292,6 +293,8 @@ public class ResourceServerTokenServicesConfiguration {
 		@Override
 		public ConditionOutcome getMatchOutcome(ConditionContext context,
 				AnnotatedTypeMetadata metadata) {
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("OAuth TokenInfo Condition");
 			Environment environment = context.getEnvironment();
 			RelaxedPropertyResolver resolver = new RelaxedPropertyResolver(environment,
 					"security.oauth2.resource.");
@@ -305,13 +308,14 @@ public class ResourceServerTokenServicesConfiguration {
 			String tokenInfoUri = resolver.getProperty("token-info-uri");
 			String userInfoUri = resolver.getProperty("user-info-uri");
 			if (!StringUtils.hasLength(userInfoUri)) {
-				return ConditionOutcome.match("No user info provided");
+				return ConditionOutcome
+						.match(message.didNotFind("user-info-uri property").atAll());
 			}
 			if (StringUtils.hasLength(tokenInfoUri) && preferTokenInfo) {
-				return ConditionOutcome.match(
-						"Token info endpoint " + "is preferred and user info provided");
+				return ConditionOutcome
+						.match(message.foundExactly("preferred token-info-uri property"));
 			}
-			return ConditionOutcome.noMatch("Token info endpoint is not provided");
+			return ConditionOutcome.noMatch(message.didNotFind("token info").atAll());
 		}
 
 	}
@@ -321,14 +325,18 @@ public class ResourceServerTokenServicesConfiguration {
 		@Override
 		public ConditionOutcome getMatchOutcome(ConditionContext context,
 				AnnotatedTypeMetadata metadata) {
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("OAuth JWT Condition");
 			RelaxedPropertyResolver resolver = new RelaxedPropertyResolver(
 					context.getEnvironment(), "security.oauth2.resource.jwt.");
 			String keyValue = resolver.getProperty("key-value");
 			String keyUri = resolver.getProperty("key-uri");
 			if (StringUtils.hasText(keyValue) || StringUtils.hasText(keyUri)) {
-				return ConditionOutcome.match("public key is provided");
+				return ConditionOutcome
+						.match(message.foundExactly("provided public key"));
 			}
-			return ConditionOutcome.noMatch("public key is not provided");
+			return ConditionOutcome
+					.noMatch(message.didNotFind("provided public key").atAll());
 		}
 
 	}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/session/SessionCondition.java

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.autoconfigure.session;
 
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
 import org.springframework.boot.bind.RelaxedPropertyResolver;
@@ -38,22 +39,27 @@ class SessionCondition extends SpringBootCondition {
 	@Override
 	public ConditionOutcome getMatchOutcome(ConditionContext context,
 			AnnotatedTypeMetadata metadata) {
+		ConditionMessage.Builder message = ConditionMessage
+				.forCondition("Session Condition");
 		RelaxedPropertyResolver resolver = new RelaxedPropertyResolver(
 				context.getEnvironment(), "spring.session.");
 		StoreType sessionStoreType = SessionStoreMappings
 				.getType(((AnnotationMetadata) metadata).getClassName());
 		if (!resolver.containsProperty("store-type")) {
 			if (sessionStoreType == StoreType.REDIS && redisPresent) {
-				return ConditionOutcome
-						.match("Session store type default to redis (deprecated)");
+				return ConditionOutcome.match(
+						message.foundExactly("default store type of redis (deprecated)"));
 			}
-			return ConditionOutcome.noMatch("Session store type not set");
+			return ConditionOutcome.noMatch(
+					message.didNotFind("spring.session.store-type property").atAll());
 		}
 		String value = resolver.getProperty("store-type").replace("-", "_").toUpperCase();
 		if (value.equals(sessionStoreType.name())) {
-			return ConditionOutcome.match("Session store type " + sessionStoreType);
+			return ConditionOutcome.match(message
+					.found("spring.session.store-type property").items(sessionStoreType));
 		}
-		return ConditionOutcome.noMatch("Session store type " + value);
+		return ConditionOutcome
+				.noMatch(message.found("spring.session.store-type property").items(value));
 	}
 
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/DispatcherServletAutoConfiguration.java

@@ -27,6 +27,8 @@ import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.AutoConfigureOrder;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage.Style;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
@@ -153,23 +155,28 @@ public class DispatcherServletAutoConfiguration {
 		@Override
 		public ConditionOutcome getMatchOutcome(ConditionContext context,
 				AnnotatedTypeMetadata metadata) {
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("Default DispatcherServlet");
 			ConfigurableListableBeanFactory beanFactory = context.getBeanFactory();
 			List<String> dispatchServletBeans = Arrays.asList(beanFactory
 					.getBeanNamesForType(DispatcherServlet.class, false, false));
 			if (dispatchServletBeans.contains(DEFAULT_DISPATCHER_SERVLET_BEAN_NAME)) {
-				return ConditionOutcome.noMatch("found DispatcherServlet named "
-						+ DEFAULT_DISPATCHER_SERVLET_BEAN_NAME);
+				return ConditionOutcome.noMatch(message.found("dispatcher servlet bean")
+						.items(DEFAULT_DISPATCHER_SERVLET_BEAN_NAME));
 			}
 			if (beanFactory.containsBean(DEFAULT_DISPATCHER_SERVLET_BEAN_NAME)) {
-				return ConditionOutcome.noMatch("found non-DispatcherServlet named "
-						+ DEFAULT_DISPATCHER_SERVLET_BEAN_NAME);
+				return ConditionOutcome
+						.noMatch(message.found("non dispatcher servlet bean")
+								.items(DEFAULT_DISPATCHER_SERVLET_BEAN_NAME));
 			}
 			if (dispatchServletBeans.isEmpty()) {
-				return ConditionOutcome.match("no DispatcherServlet found");
+				return ConditionOutcome
+						.match(message.didNotFind("dispatcher servlet beans").atAll());
 			}
-			return ConditionOutcome
-					.match("one or more DispatcherServlets found and none is named "
-							+ DEFAULT_DISPATCHER_SERVLET_BEAN_NAME);
+			return ConditionOutcome.match(message
+					.found("dipatcher servlet bean", "dispatcher servlet beans")
+					.items(Style.QUOTE, dispatchServletBeans)
+					.append("and none is named " + DEFAULT_DISPATCHER_SERVLET_BEAN_NAME));
 		}
 
 	}
@@ -197,39 +204,48 @@ public class DispatcherServletAutoConfiguration {
 					.containsBean(DEFAULT_DISPATCHER_SERVLET_BEAN_NAME);
 			if (containsDispatcherBean
 					&& !servlets.contains(DEFAULT_DISPATCHER_SERVLET_BEAN_NAME)) {
-				return ConditionOutcome.noMatch("found non-DispatcherServlet named "
-						+ DEFAULT_DISPATCHER_SERVLET_BEAN_NAME);
+				return ConditionOutcome
+						.noMatch(startMessage().found("non dispatcher servlet")
+								.items(DEFAULT_DISPATCHER_SERVLET_BEAN_NAME));
 			}
 			return ConditionOutcome.match();
 		}
 
 		private ConditionOutcome checkServletRegistration(
 				ConfigurableListableBeanFactory beanFactory) {
+			ConditionMessage.Builder message = startMessage();
 			List<String> registrations = Arrays.asList(beanFactory
 					.getBeanNamesForType(ServletRegistrationBean.class, false, false));
 			boolean containsDispatcherRegistrationBean = beanFactory
 					.containsBean(DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME);
 			if (registrations.isEmpty()) {
 				if (containsDispatcherRegistrationBean) {
-					return ConditionOutcome.noMatch("found no ServletRegistrationBean "
-							+ "but a non-ServletRegistrationBean named "
-							+ DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME);
+					return ConditionOutcome
+							.noMatch(message.found("non servlet registration bean").items(
+									DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME));
 				}
-				return ConditionOutcome.match("no ServletRegistrationBean found");
+				return ConditionOutcome
+						.match(message.didNotFind("servlet registration bean").atAll());
 			}
 			if (registrations
 					.contains(DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME)) {
-				return ConditionOutcome.noMatch("found ServletRegistrationBean named "
-						+ DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME);
+				return ConditionOutcome.noMatch(message.found("servlet registration bean")
+						.items(DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME));
 			}
 			if (containsDispatcherRegistrationBean) {
-				return ConditionOutcome.noMatch("found non-ServletRegistrationBean named "
-						+ DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME);
+				return ConditionOutcome
+						.noMatch(message.found("non servlet registration bean").items(
+								DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME));
 			}
-			return ConditionOutcome
-					.match("one or more ServletRegistrationBeans is found and none is named "
-							+ DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME);
+			return ConditionOutcome.match(message.found("servlet registration beans")
+					.items(Style.QUOTE, registrations).append("and none is named "
+							+ DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME));
 		}
+
+		private ConditionMessage.Builder startMessage() {
+			return ConditionMessage.forCondition("DispatcherServlet Registration");
+		}
+
 	}
 
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ErrorMvcAutoConfiguration.java

@@ -32,6 +32,7 @@ import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
@@ -166,6 +167,8 @@ public class ErrorMvcAutoConfiguration {
 		@Override
 		public ConditionOutcome getMatchOutcome(ConditionContext context,
 				AnnotatedTypeMetadata metadata) {
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("ErrorTemplate Misssing");
 			TemplateAvailabilityProviders providers = new TemplateAvailabilityProviders(
 					context.getClassLoader());
 			TemplateAvailabilityProvider provider = providers.getProvider("error",
@@ -173,9 +176,10 @@ public class ErrorMvcAutoConfiguration {
 					context.getResourceLoader());
 			if (provider != null) {
 				return ConditionOutcome
-						.noMatch("Template from " + provider + " found for error view");
+						.noMatch(message.foundExactly("template from " + provider));
 			}
-			return ConditionOutcome.match("No error template view detected");
+			return ConditionOutcome
+					.match(message.didNotFind("error template view").atAll());
 		}
 
 	}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/OnEnabledResourceChainCondition.java

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.autoconfigure.web;
 
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
 import org.springframework.boot.bind.PropertySourcesPropertyValues;
@@ -31,6 +32,7 @@ import org.springframework.util.ClassUtils;
  * enabled.
  *
  * @author Stephane Nicoll
+ * @see ConditionalOnEnabledResourceChain
  */
 class OnEnabledResourceChainCondition extends SpringBootCondition {
 
@@ -45,15 +47,21 @@ class OnEnabledResourceChainCondition extends SpringBootCondition {
 		RelaxedDataBinder binder = new RelaxedDataBinder(properties, "spring.resources");
 		binder.bind(new PropertySourcesPropertyValues(environment.getPropertySources()));
 		Boolean match = properties.getChain().getEnabled();
+		ConditionMessage.Builder message = ConditionMessage
+				.forCondition(ConditionalOnEnabledResourceChain.class);
 		if (match == null) {
-			boolean webJarsLocatorPresent = ClassUtils.isPresent(WEBJAR_ASSERT_LOCATOR,
-					getClass().getClassLoader());
-			return new ConditionOutcome(webJarsLocatorPresent,
-					"Webjars locator (" + WEBJAR_ASSERT_LOCATOR + ") is "
-							+ (webJarsLocatorPresent ? "present" : "absent"));
+			if (ClassUtils.isPresent(WEBJAR_ASSERT_LOCATOR,
+					getClass().getClassLoader())) {
+				return ConditionOutcome
+						.match(message.found("class").items(WEBJAR_ASSERT_LOCATOR));
+			}
+			return ConditionOutcome
+					.noMatch(message.didNotFind("class").items(WEBJAR_ASSERT_LOCATOR));
 		}
-		return new ConditionOutcome(match,
-				"Resource chain is " + (match ? "enabled" : "disabled"));
+		if (match) {
+			return ConditionOutcome.match(message.because("enabled"));
+		}
+		return ConditionOutcome.noMatch(message.because("disabled"));
 	}
 
 }

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/condition/ConditionEvaluationReportTests.java

@@ -216,9 +216,11 @@ public class ConditionEvaluationReportTests {
 		for (ConditionAndOutcome outcome : outcomes) {
 			messages.add(outcome.getOutcome().getMessage());
 		}
-		assertThat(messages).areAtLeastOne(Matched.by(
-				containsString("@ConditionalOnClass classes found: javax.servlet.Servlet,"
-						+ "org.springframework.web.multipart.support.StandardServletMultipartResolver")));
+		assertThat(messages).areAtLeastOne(
+				Matched.by(containsString("@ConditionalOnClass found required classes "
+						+ "'javax.servlet.Servlet', 'org.springframework.web.multipart."
+						+ "support.StandardServletMultipartResolver', "
+						+ "'javax.servlet.MultipartConfigElement'")));
 		context.close();
 	}
 

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/condition/ConditionMessageTests.java

@@ -0,0 +1,197 @@
+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.condition;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Test;
+
+import org.springframework.boot.autoconfigure.condition.ConditionMessage.Style;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link ConditionMessage}.
+ *
+ * @author Phillip Webb
+ */
+public class ConditionMessageTests {
+
+	@Test
+	public void isEmptyWhenEmptyShouldReturnTrue() throws Exception {
+		ConditionMessage message = ConditionMessage.empty();
+		assertThat(message.isEmpty()).isTrue();
+	}
+
+	@Test
+	public void isEmptyWhenNotEmptyShouldReturnFalse() throws Exception {
+		ConditionMessage message = ConditionMessage.of("Test");
+		assertThat(message.isEmpty()).isFalse();
+	}
+
+	@Test
+	public void toStringWhenHasMessageShouldReturnMessage() throws Exception {
+		ConditionMessage message = ConditionMessage.empty();
+		assertThat(message.toString()).isEqualTo("");
+	}
+
+	@Test
+	public void toStringWhenEmptyShouldReturnEmptyString() throws Exception {
+		ConditionMessage message = ConditionMessage.of("Test");
+		assertThat(message.toString()).isEqualTo("Test");
+	}
+
+	@Test
+	public void appendWhenHasExistingMessageShouldAddSpace() throws Exception {
+		ConditionMessage message = ConditionMessage.of("a").append("b");
+		assertThat(message.toString()).isEqualTo("a b");
+	}
+
+	@Test
+	public void appendWhenAppendingNullShouldDoNothing() throws Exception {
+		ConditionMessage message = ConditionMessage.of("a").append(null);
+		assertThat(message.toString()).isEqualTo("a");
+	}
+
+	@Test
+	public void appendWhenNoMessageShouldNotAddSpace() throws Exception {
+		ConditionMessage message = ConditionMessage.empty().append("b");
+		assertThat(message.toString()).isEqualTo("b");
+	}
+
+	@Test
+	public void andConditionWhenUsingClassShouldIncludeCondition() throws Exception {
+		ConditionMessage message = ConditionMessage.empty().andCondition(Test.class)
+				.because("OK");
+		assertThat(message.toString()).isEqualTo("@Test OK");
+	}
+
+	@Test
+	public void andConditionWhenUsingStringShouldIncludeCondition() throws Exception {
+		ConditionMessage message = ConditionMessage.empty().andCondition("@Test")
+				.because("OK");
+		assertThat(message.toString()).isEqualTo("@Test OK");
+	}
+
+	@Test
+	public void andConditionWhenIncludingDetailsShouldIncludeCondition()
+			throws Exception {
+		ConditionMessage message = ConditionMessage.empty()
+				.andCondition(Test.class, "(a=b)").because("OK");
+		assertThat(message.toString()).isEqualTo("@Test (a=b) OK");
+	}
+
+	@Test
+	public void ofCollectionShouldCombine() throws Exception {
+		List<ConditionMessage> messages = new ArrayList<ConditionMessage>();
+		messages.add(ConditionMessage.of("a"));
+		messages.add(ConditionMessage.of("b"));
+		ConditionMessage message = ConditionMessage.of(messages);
+		assertThat(message.toString()).isEqualTo("a; b");
+	}
+
+	@Test
+	public void ofCollectionWhenNullShouldReturnEmpty() throws Exception {
+		ConditionMessage message = ConditionMessage.of((List<ConditionMessage>) null);
+		assertThat(message.isEmpty()).isTrue();
+	}
+
+	@Test
+	public void forConditionShouldIncludeCondition() throws Exception {
+		ConditionMessage message = ConditionMessage.forCondition("@Test").because("OK");
+		assertThat(message.toString()).isEqualTo("@Test OK");
+	}
+
+	@Test
+	public void forConditionWhenClassShouldIncludeCondition() throws Exception {
+		ConditionMessage message = ConditionMessage.forCondition(Test.class, "(a=b)")
+				.because("OK");
+		assertThat(message.toString()).isEqualTo("@Test (a=b) OK");
+	}
+
+	@Test
+	public void foundExactlyShouldConstructMessage() throws Exception {
+		ConditionMessage message = ConditionMessage.forCondition(Test.class)
+				.foundExactly("abc");
+		assertThat(message.toString()).isEqualTo("@Test found abc");
+	}
+
+	@Test
+	public void foundWhenSingleElementShouldUsingSingular() throws Exception {
+		ConditionMessage message = ConditionMessage.forCondition(Test.class)
+				.found("bean", "beans").items("a");
+		assertThat(message.toString()).isEqualTo("@Test found bean a");
+	}
+
+	@Test
+	public void foundNoneAtAllShouldConstructMessage() throws Exception {
+		ConditionMessage message = ConditionMessage.forCondition(Test.class)
+				.found("no beans").atAll();
+		assertThat(message.toString()).isEqualTo("@Test found no beans");
+	}
+
+	@Test
+	public void foundWhenMultipleElementsShouldUsePlural() throws Exception {
+		ConditionMessage message = ConditionMessage.forCondition(Test.class)
+				.found("bean", "beans").items("a", "b", "c");
+		assertThat(message.toString()).isEqualTo("@Test found beans a, b, c");
+	}
+
+	@Test
+	public void foundWhenQuoteStyleShouldQuote() throws Exception {
+		ConditionMessage message = ConditionMessage.forCondition(Test.class)
+				.found("bean", "beans").items(Style.QUOTE, "a", "b", "c");
+		assertThat(message.toString()).isEqualTo("@Test found beans 'a', 'b', 'c'");
+	}
+
+	@Test
+	public void didNotFindWhenSingleElementShouldUsingSingular() throws Exception {
+		ConditionMessage message = ConditionMessage.forCondition(Test.class)
+				.didNotFind("class", "classes").items("a");
+		assertThat(message.toString()).isEqualTo("@Test did not find class a");
+	}
+
+	@Test
+	public void didNotFindWhenMultipleElementsShouldUsePlural() throws Exception {
+		ConditionMessage message = ConditionMessage.forCondition(Test.class)
+				.didNotFind("class", "classes").items("a", "b", "c");
+		assertThat(message.toString()).isEqualTo("@Test did not find classes a, b, c");
+	}
+
+	@Test
+	public void resultedInShouldConstructMessage() throws Exception {
+		ConditionMessage message = ConditionMessage.forCondition(Test.class)
+				.resultedIn("Green");
+		assertThat(message.toString()).isEqualTo("@Test resulted in Green");
+	}
+
+	@Test
+	public void notAvailableShouldConstructMessage() throws Exception {
+		ConditionMessage message = ConditionMessage.forCondition(Test.class)
+				.notAvailable("JMX");
+		assertThat(message.toString()).isEqualTo("@Test JMX is not available");
+	}
+
+	@Test
+	public void availableShouldConstructMessage() throws Exception {
+		ConditionMessage message = ConditionMessage.forCondition(Test.class)
+				.available("JMX");
+		assertThat(message.toString()).isEqualTo("@Test JMX is available");
+	}
+
+}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/condition/ConditionalOnClassTests.java

@@ -70,37 +70,45 @@ public class ConditionalOnClassTests {
 	@Configuration
 	@ConditionalOnClass(ConditionalOnClassTests.class)
 	protected static class BasicConfiguration {
+
 		@Bean
 		public String bar() {
 			return "bar";
 		}
+
 	}
 
 	@Configuration
 	@ConditionalOnClass(name = "FOO")
 	protected static class MissingConfiguration {
+
 		@Bean
 		public String bar() {
 			return "bar";
 		}
+
 	}
 
 	@Configuration
 	protected static class FooConfiguration {
+
 		@Bean
 		public String foo() {
 			return "foo";
 		}
+
 	}
 
 	@Configuration
 	@ImportResource("org/springframework/boot/autoconfigure/condition/foo.xml")
 	protected static class XmlConfiguration {
+
 	}
 
 	@Configuration
 	@Import(BasicConfiguration.class)
 	@ImportResource("org/springframework/boot/autoconfigure/condition/foo.xml")
 	protected static class CombinedXmlConfiguration {
+
 	}
 }

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/condition/ConditionalOnJavaTests.java

@@ -81,7 +81,7 @@ public class ConditionalOnJavaTests {
 		ConditionOutcome outcome = this.condition.getMatchOutcome(Range.EQUAL_OR_NEWER,
 				JavaVersion.SEVEN, JavaVersion.SIX);
 		assertThat(outcome.getMessage())
-				.isEqualTo("Required JVM version " + "1.6 or newer found 1.7");
+				.isEqualTo("@ConditionalOnJava (1.6 or newer) found 1.7");
 	}
 
 	@Test
@@ -89,7 +89,7 @@ public class ConditionalOnJavaTests {
 		ConditionOutcome outcome = this.condition.getMatchOutcome(Range.OLDER_THAN,
 				JavaVersion.SEVEN, JavaVersion.SIX);
 		assertThat(outcome.getMessage())
-				.isEqualTo("Required JVM version " + "older than 1.6 found 1.7");
+				.isEqualTo("@ConditionalOnJava (older than 1.6) found 1.7");
 	}
 
 	@Test

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/autoconfigure/DevToolsDataSourceAutoConfiguration.java

@@ -27,6 +27,7 @@ import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
 import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
@@ -126,16 +127,18 @@ public class DevToolsDataSourceAutoConfiguration {
 		@Override
 		public ConditionOutcome getMatchOutcome(ConditionContext context,
 				AnnotatedTypeMetadata metadata) {
+			ConditionMessage.Builder message = ConditionMessage
+					.forCondition("DevTools DataSource Condition");
 			String[] dataSourceBeanNames = context.getBeanFactory()
 					.getBeanNamesForType(DataSource.class);
 			if (dataSourceBeanNames.length != 1) {
 				return ConditionOutcome
-						.noMatch("A single DataSource bean was not found in the context");
+						.noMatch(message.didNotFind("a single DataSource bean").atAll());
 			}
 			if (context.getBeanFactory()
 					.getBeanNamesForType(DataSourceProperties.class).length != 1) {
 				return ConditionOutcome.noMatch(
-						"A single DataSourceProperties bean was not found in the context");
+						message.didNotFind("a single DataSourceProperties bean").atAll());
 			}
 			BeanDefinition dataSourceDefinition = context.getRegistry()
 					.getBeanDefinition(dataSourceBeanNames[0]);
@@ -146,9 +149,11 @@ public class DevToolsDataSourceAutoConfiguration {
 							.getFactoryMethodMetadata().getDeclaringClassName()
 							.startsWith(DataSourceAutoConfiguration.class.getPackage()
 									.getName() + ".DataSourceConfiguration$")) {
-				return ConditionOutcome.match("Found auto-configured DataSource");
+				return ConditionOutcome
+						.match(message.foundExactly("auto-configured DataSource"));
 			}
-			return ConditionOutcome.noMatch("DataSource was not auto-configured");
+			return ConditionOutcome
+					.noMatch(message.didNotFind("an auto-configured DataSource").atAll());
 		}
 
 	}

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/remote/client/LocalDebugPortAvailableCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,6 +18,7 @@ package org.springframework.boot.devtools.remote.client;
 
 import javax.net.ServerSocketFactory;
 
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
 import org.springframework.boot.bind.RelaxedPropertyResolver;
@@ -35,6 +36,8 @@ class LocalDebugPortAvailableCondition extends SpringBootCondition {
 	@Override
 	public ConditionOutcome getMatchOutcome(ConditionContext context,
 			AnnotatedTypeMetadata metadata) {
+		ConditionMessage.Builder message = ConditionMessage
+				.forCondition("Local Debug Port Condition");
 		RelaxedPropertyResolver resolver = new RelaxedPropertyResolver(
 				context.getEnvironment(), "spring.devtools.remote.debug.");
 		Integer port = resolver.getProperty("local-port", Integer.class);
@@ -42,9 +45,9 @@ class LocalDebugPortAvailableCondition extends SpringBootCondition {
 			port = RemoteDevToolsProperties.Debug.DEFAULT_LOCAL_PORT;
 		}
 		if (isPortAvailable(port)) {
-			return ConditionOutcome.match("Local debug port available");
+			return ConditionOutcome.match(message.foundExactly("local debug port"));
 		}
-		return ConditionOutcome.noMatch("Local debug port unavailable");
+		return ConditionOutcome.noMatch(message.didNotFind("local debug port").atAll());
 	}
 
 	private boolean isPortAvailable(int port) {

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/restart/OnInitializedRestarterCondition.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,7 @@
 
 package org.springframework.boot.devtools.restart;
 
+import org.springframework.boot.autoconfigure.condition.ConditionMessage;
 import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
 import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
 import org.springframework.context.annotation.Condition;
@@ -33,14 +34,16 @@ class OnInitializedRestarterCondition extends SpringBootCondition {
 	@Override
 	public ConditionOutcome getMatchOutcome(ConditionContext context,
 			AnnotatedTypeMetadata metadata) {
+		ConditionMessage.Builder message = ConditionMessage
+				.forCondition("Initializer Restarter Condition");
 		Restarter restarter = getRestarter();
 		if (restarter == null) {
-			return ConditionOutcome.noMatch("Restarter unavailable");
+			return ConditionOutcome.noMatch(message.because("unavailable"));
 		}
 		if (restarter.getInitialUrls() == null) {
-			return ConditionOutcome.noMatch("Restarter initialized without URLs");
+			return ConditionOutcome.noMatch(message.because("initialized without URLs"));
 		}
-		return ConditionOutcome.match("Restarter available and initialized");
+		return ConditionOutcome.match(message.because("available and initialized"));
 	}
 
 	private Restarter getRestarter() {

spring-boot-devtools/src/test/java/org/springframework/boot/devtools/remote/client/LocalDebugPortAvailableConditionTests.java

@@ -47,7 +47,8 @@ public class LocalDebugPortAvailableConditionTests {
 	public void portAvailable() throws Exception {
 		ConditionOutcome outcome = getOutcome();
 		assertThat(outcome.isMatch()).isTrue();
-		assertThat(outcome.getMessage()).isEqualTo("Local debug port available");
+		assertThat(outcome.getMessage())
+				.isEqualTo("Local Debug Port Condition found local debug port");
 	}
 
 	@Test
@@ -57,7 +58,8 @@ public class LocalDebugPortAvailableConditionTests {
 		ConditionOutcome outcome = getOutcome();
 		serverSocket.close();
 		assertThat(outcome.isMatch()).isFalse();
-		assertThat(outcome.getMessage()).isEqualTo("Local debug port unavailable");
+		assertThat(outcome.getMessage())
+				.isEqualTo("Local Debug Port Condition did not find local debug port");
 	}
 
 	private ConditionOutcome getOutcome() {