Merge pull request #7086 from nebhale/logger-actuator

* pr/7086:
  Polish `/loggers` actuator endpoint
  Add `/loggers` actuator endpoint

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

@@ -37,6 +37,7 @@ import org.springframework.boot.actuate.endpoint.FlywayEndpoint;
 import org.springframework.boot.actuate.endpoint.HealthEndpoint;
 import org.springframework.boot.actuate.endpoint.InfoEndpoint;
 import org.springframework.boot.actuate.endpoint.LiquibaseEndpoint;
+import org.springframework.boot.actuate.endpoint.LoggersEndpoint;
 import org.springframework.boot.actuate.endpoint.MetricsEndpoint;
 import org.springframework.boot.actuate.endpoint.PublicMetrics;
 import org.springframework.boot.actuate.endpoint.RequestMappingEndpoint;
@@ -59,6 +60,7 @@ import org.springframework.boot.autoconfigure.condition.SearchStrategy;
 import org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration;
 import org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.logging.LoggingSystem;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.annotation.AnnotationAwareOrderComparator;
@@ -75,7 +77,7 @@ import org.springframework.web.servlet.handler.AbstractHandlerMethodMapping;
  * @author Stephane Nicoll
  * @author Eddú Meléndez
  * @author Meang Akira Tanaka
- *
+ * @author Ben Hale
  */
 @Configuration
 @AutoConfigureAfter({ FlywayAutoConfiguration.class, LiquibaseAutoConfiguration.class })
@@ -135,6 +137,13 @@ public class EndpointAutoConfiguration {
 				? Collections.<InfoContributor>emptyList() : this.infoContributors);
 	}
 
+	@Bean
+	@ConditionalOnBean(LoggingSystem.class)
+	@ConditionalOnMissingBean
+	public LoggersEndpoint loggersEndpoint(LoggingSystem loggingSystem) {
+		return new LoggersEndpoint(loggingSystem);
+	}
+
 	@Bean
 	@ConditionalOnMissingBean
 	public MetricsEndpoint metricsEndpoint() {

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

@@ -25,6 +25,7 @@ import org.springframework.boot.actuate.condition.ConditionalOnEnabledEndpoint;
 import org.springframework.boot.actuate.endpoint.Endpoint;
 import org.springframework.boot.actuate.endpoint.EnvironmentEndpoint;
 import org.springframework.boot.actuate.endpoint.HealthEndpoint;
+import org.springframework.boot.actuate.endpoint.LoggersEndpoint;
 import org.springframework.boot.actuate.endpoint.MetricsEndpoint;
 import org.springframework.boot.actuate.endpoint.ShutdownEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.EndpointHandlerMapping;
@@ -33,6 +34,7 @@ import org.springframework.boot.actuate.endpoint.mvc.EnvironmentMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.HealthMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.HeapdumpMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.LogFileMvcEndpoint;
+import org.springframework.boot.actuate.endpoint.mvc.LoggersMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.MetricsMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.MvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.MvcEndpoints;
@@ -57,6 +59,7 @@ import org.springframework.web.cors.CorsConfiguration;
  * Configuration to expose {@link Endpoint} instances over Spring MVC.
  *
  * @author Dave Syer
+ * @author Ben Hale
  * @since 1.3.0
  */
 @ManagementContextConfiguration
@@ -150,6 +153,13 @@ public class EndpointWebMvcManagementContextConfiguration {
 		return healthMvcEndpoint;
 	}
 
+	@Bean
+	@ConditionalOnBean(LoggersEndpoint.class)
+	@ConditionalOnEnabledEndpoint("loggers")
+	public LoggersMvcEndpoint loggersMvcEndpoint(LoggersEndpoint delegate) {
+		return new LoggersMvcEndpoint(delegate);
+	}
+
 	@Bean
 	@ConditionalOnBean(MetricsEndpoint.class)
 	@ConditionalOnEnabledEndpoint("metrics")

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/LoggersEndpoint.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright 2016-2016 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.actuate.endpoint;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.logging.LogLevel;
+import org.springframework.boot.logging.LoggerConfiguration;
+import org.springframework.boot.logging.LoggingSystem;
+import org.springframework.util.Assert;
+
+/**
+ * {@link Endpoint} to expose a collection of {@link LoggerConfiguration}s.
+ *
+ * @author Ben Hale
+ * @author Phillip Webb
+ * @since 1.5.0
+ */
+@ConfigurationProperties(prefix = "endpoints.loggers")
+public class LoggersEndpoint
+		extends AbstractEndpoint<Map<String, LoggersEndpoint.LoggerLevels>> {
+
+	private final LoggingSystem loggingSystem;
+
+	/**
+	 * Create a new {@link LoggersEndpoint} instance.
+	 * @param loggingSystem the logging system to expose
+	 */
+	public LoggersEndpoint(LoggingSystem loggingSystem) {
+		super("loggers");
+		Assert.notNull(loggingSystem, "LoggingSystem must not be null");
+		this.loggingSystem = loggingSystem;
+	}
+
+	@Override
+	public Map<String, LoggerLevels> invoke() {
+		Collection<LoggerConfiguration> configurations = this.loggingSystem
+				.getLoggerConfigurations();
+		if (configurations == null) {
+			return Collections.emptyMap();
+		}
+		Map<String, LoggerLevels> result = new LinkedHashMap<String, LoggerLevels>(
+				configurations.size());
+		for (LoggerConfiguration configuration : configurations) {
+			result.put(configuration.getName(), new LoggerLevels(configuration));
+		}
+		return result;
+	}
+
+	public LoggerLevels invoke(String name) {
+		Assert.notNull(name, "Name must not be null");
+		LoggerConfiguration configuration = this.loggingSystem
+				.getLoggerConfiguration(name);
+		return (configuration == null ? null : new LoggerLevels(configuration));
+	}
+
+	public void setLogLevel(String name, LogLevel level) {
+		Assert.notNull(name, "Name must not be empty");
+		this.loggingSystem.setLogLevel(name, level);
+	}
+
+	/**
+	 * Levels configured for a given logger exposed in a JSON friendly way.
+	 */
+	public static class LoggerLevels {
+
+		private String configuredLevel;
+
+		private String effectiveLevel;
+
+		public LoggerLevels(LoggerConfiguration configuration) {
+			this.configuredLevel = getName(configuration.getConfiguredLevel());
+			this.effectiveLevel = getName(configuration.getEffectiveLevel());
+		}
+
+		private String getName(LogLevel level) {
+			return (level == null ? null : level.name());
+		}
+
+		public String getConfiguredLevel() {
+			return this.configuredLevel;
+		}
+
+		public String getEffectiveLevel() {
+			return this.effectiveLevel;
+		}
+
+	}
+
+}

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/mvc/LoggersMvcEndpoint.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2016-2016 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.actuate.endpoint.mvc;
+
+import java.util.Map;
+
+import org.springframework.boot.actuate.endpoint.LoggersEndpoint;
+import org.springframework.boot.actuate.endpoint.LoggersEndpoint.LoggerLevels;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.logging.LogLevel;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+/**
+ * Adapter to expose {@link LoggersEndpoint} as an {@link MvcEndpoint}.
+ *
+ * @author Ben Hale
+ * @since 1.5.0
+ */
+@ConfigurationProperties(prefix = "endpoints.loggers")
+public class LoggersMvcEndpoint extends EndpointMvcAdapter {
+
+	private final LoggersEndpoint delegate;
+
+	public LoggersMvcEndpoint(LoggersEndpoint delegate) {
+		super(delegate);
+		this.delegate = delegate;
+	}
+
+	@GetMapping(value = "/{name:.*}", produces = MediaType.APPLICATION_JSON_VALUE)
+	@ResponseBody
+	@HypermediaDisabled
+	public Object get(@PathVariable String name) {
+		if (!this.delegate.isEnabled()) {
+			// Shouldn't happen - MVC endpoint shouldn't be registered when delegate's
+			// disabled
+			return getDisabledResponse();
+		}
+		LoggerLevels levels = this.delegate.invoke(name);
+		return (levels == null ? ResponseEntity.notFound().build() : levels);
+	}
+
+	@PostMapping(value = "/{name:.*}", consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
+	@ResponseBody
+	@HypermediaDisabled
+	public Object set(@PathVariable String name,
+			@RequestBody Map<String, String> configuration) {
+		if (!this.delegate.isEnabled()) {
+			// Shouldn't happen - MVC endpoint shouldn't be registered when delegate's
+			// disabled
+			return getDisabledResponse();
+		}
+		String level = configuration.get("configuredLevel");
+		this.delegate.setLogLevel(name, level == null ? null : LogLevel.valueOf(level));
+		return HttpEntity.EMPTY;
+	}
+
+}

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/autoconfigure/EndpointAutoConfigurationTests.java

@@ -36,6 +36,8 @@ import org.springframework.boot.actuate.endpoint.FlywayEndpoint;
 import org.springframework.boot.actuate.endpoint.HealthEndpoint;
 import org.springframework.boot.actuate.endpoint.InfoEndpoint;
 import org.springframework.boot.actuate.endpoint.LiquibaseEndpoint;
+import org.springframework.boot.actuate.endpoint.LoggersEndpoint;
+import org.springframework.boot.actuate.endpoint.LoggersEndpoint.LoggerLevels;
 import org.springframework.boot.actuate.endpoint.MetricsEndpoint;
 import org.springframework.boot.actuate.endpoint.PublicMetrics;
 import org.springframework.boot.actuate.endpoint.RequestMappingEndpoint;
@@ -52,6 +54,7 @@ import org.springframework.boot.autoconfigure.info.ProjectInfoProperties;
 import org.springframework.boot.autoconfigure.jdbc.EmbeddedDataSourceConfiguration;
 import org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration;
 import org.springframework.boot.bind.PropertySourcesBinder;
+import org.springframework.boot.logging.LoggingSystem;
 import org.springframework.boot.test.util.EnvironmentTestUtils;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
@@ -75,6 +78,7 @@ import static org.mockito.Mockito.mock;
  * @author Stephane Nicoll
  * @author Eddú Meléndez
  * @author Meang Akira Tanaka
+ * @author Ben Hale
  */
 public class EndpointAutoConfigurationTests {
 
@@ -89,12 +93,13 @@ public class EndpointAutoConfigurationTests {
 
 	@Test
 	public void endpoints() throws Exception {
-		load(EndpointAutoConfiguration.class);
+		load(CustomLoggingConfig.class, EndpointAutoConfiguration.class);
 		assertThat(this.context.getBean(BeansEndpoint.class)).isNotNull();
 		assertThat(this.context.getBean(DumpEndpoint.class)).isNotNull();
 		assertThat(this.context.getBean(EnvironmentEndpoint.class)).isNotNull();
 		assertThat(this.context.getBean(HealthEndpoint.class)).isNotNull();
 		assertThat(this.context.getBean(InfoEndpoint.class)).isNotNull();
+		assertThat(this.context.getBean(LoggersEndpoint.class)).isNotNull();
 		assertThat(this.context.getBean(MetricsEndpoint.class)).isNotNull();
 		assertThat(this.context.getBean(ShutdownEndpoint.class)).isNotNull();
 		assertThat(this.context.getBean(TraceEndpoint.class)).isNotNull();
@@ -121,6 +126,14 @@ public class EndpointAutoConfigurationTests {
 		assertThat(result).isNotNull();
 	}
 
+	@Test
+	public void loggersEndpointHasLoggers() throws Exception {
+		load(CustomLoggingConfig.class, EndpointAutoConfiguration.class);
+		LoggersEndpoint endpoint = this.context.getBean(LoggersEndpoint.class);
+		Map<String, LoggerLevels> loggers = endpoint.invoke();
+		assertThat(loggers.size()).isGreaterThan(0);
+	}
+
 	@Test
 	public void metricEndpointsHasSystemMetricsByDefault() {
 		load(PublicMetricsAutoConfiguration.class, EndpointAutoConfiguration.class);
@@ -244,6 +257,16 @@ public class EndpointAutoConfigurationTests {
 		this.context.refresh();
 	}
 
+	@Configuration
+	static class CustomLoggingConfig {
+
+		@Bean
+		LoggingSystem loggingSystem() {
+			return LoggingSystem.get(getClass().getClassLoader());
+		}
+
+	}
+
 	@Configuration
 	static class CustomPublicMetricsConfig {
 

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/autoconfigure/EndpointWebMvcAutoConfigurationTests.java

@@ -49,6 +49,7 @@ import org.springframework.boot.actuate.endpoint.mvc.EndpointHandlerMappingCusto
 import org.springframework.boot.actuate.endpoint.mvc.EnvironmentMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.HalJsonMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.HealthMvcEndpoint;
+import org.springframework.boot.actuate.endpoint.mvc.LoggersMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.MetricsMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.MvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.ShutdownMvcEndpoint;
@@ -71,6 +72,7 @@ import org.springframework.boot.context.embedded.ServerPortInfoApplicationContex
 import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
 import org.springframework.boot.context.embedded.undertow.UndertowEmbeddedServletContainerFactory;
 import org.springframework.boot.context.event.ApplicationFailedEvent;
+import org.springframework.boot.logging.LoggingSystem;
 import org.springframework.boot.test.util.EnvironmentTestUtils;
 import org.springframework.boot.testutil.Matched;
 import org.springframework.context.ApplicationContext;
@@ -108,6 +110,7 @@ import static org.mockito.Mockito.mock;
  * @author Greg Turnquist
  * @author Andy Wilkinson
  * @author Eddú Meléndez
+ * @author Ben Hale
  */
 public class EndpointWebMvcAutoConfigurationTests {
 
@@ -429,12 +432,13 @@ public class EndpointWebMvcAutoConfigurationTests {
 
 	@Test
 	public void endpointsDefaultConfiguration() throws Exception {
-		this.applicationContext.register(RootConfig.class, BaseConfiguration.class,
-				ServerPortConfig.class, EndpointWebMvcAutoConfiguration.class);
+		this.applicationContext.register(LoggingConfig.class, RootConfig.class,
+				BaseConfiguration.class, ServerPortConfig.class,
+				EndpointWebMvcAutoConfiguration.class);
 		this.applicationContext.refresh();
-		// /health, /metrics, /env, /actuator, /heapdump (/shutdown is disabled by
-		// default)
-		assertThat(this.applicationContext.getBeansOfType(MvcEndpoint.class)).hasSize(5);
+		// /health, /metrics, /loggers, /env, /actuator, /heapdump (/shutdown is disabled
+		// by default)
+		assertThat(this.applicationContext.getBeansOfType(MvcEndpoint.class)).hasSize(6);
 	}
 
 	@Test
@@ -457,6 +461,16 @@ public class EndpointWebMvcAutoConfigurationTests {
 		endpointEnabledOverride("env", EnvironmentMvcEndpoint.class);
 	}
 
+	@Test
+	public void loggersEndpointDisabled() throws Exception {
+		endpointDisabled("loggers", LoggersMvcEndpoint.class);
+	}
+
+	@Test
+	public void loggersEndpointEnabledOverride() throws Exception {
+		endpointEnabledOverride("loggers", LoggersMvcEndpoint.class);
+	}
+
 	@Test
 	public void metricsEndpointDisabled() throws Exception {
 		endpointDisabled("metrics", MetricsMvcEndpoint.class);
@@ -625,8 +639,9 @@ public class EndpointWebMvcAutoConfigurationTests {
 
 	private void endpointEnabledOverride(String name, Class<? extends MvcEndpoint> type)
 			throws Exception {
-		this.applicationContext.register(RootConfig.class, BaseConfiguration.class,
-				ServerPortConfig.class, EndpointWebMvcAutoConfiguration.class);
+		this.applicationContext.register(LoggingConfig.class, RootConfig.class,
+				BaseConfiguration.class, ServerPortConfig.class,
+				EndpointWebMvcAutoConfiguration.class);
 		EnvironmentTestUtils.addEnvironment(this.applicationContext,
 				"endpoints.enabled:false",
 				String.format("endpoints_%s_enabled:true", name));
@@ -740,6 +755,16 @@ public class EndpointWebMvcAutoConfigurationTests {
 
 	}
 
+	@Configuration
+	public static class LoggingConfig {
+
+		@Bean
+		public LoggingSystem loggingSystem() {
+			return LoggingSystem.get(getClass().getClassLoader());
+		}
+
+	}
+
 	@Configuration
 	public static class ServerPortConfig {
 

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/autoconfigure/MvcEndpointPathConfigurationTests.java

@@ -42,6 +42,7 @@ import org.springframework.boot.actuate.endpoint.mvc.HalJsonMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.HealthMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.JolokiaMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.LogFileMvcEndpoint;
+import org.springframework.boot.actuate.endpoint.mvc.LoggersMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.ManagementServletContext;
 import org.springframework.boot.actuate.endpoint.mvc.MetricsMvcEndpoint;
 import org.springframework.boot.actuate.endpoint.mvc.MvcEndpoint;
@@ -50,6 +51,7 @@ import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionEvaluationReport;
 import org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration;
 import org.springframework.boot.autoconfigure.web.ServerPropertiesAutoConfiguration;
+import org.springframework.boot.logging.LoggingSystem;
 import org.springframework.boot.test.util.EnvironmentTestUtils;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -62,6 +64,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * Tests for configuring the path of an MVC endpoint.
  *
  * @author Andy Wilkinson
+ * @author Ben Hale
  */
 @RunWith(Parameterized.class)
 public class MvcEndpointPathConfigurationTests {
@@ -95,6 +98,7 @@ public class MvcEndpointPathConfigurationTests {
 				new Object[] { "jolokia", JolokiaMvcEndpoint.class },
 				new Object[] { "liquibase", LiquibaseEndpoint.class },
 				new Object[] { "logfile", LogFileMvcEndpoint.class },
+				new Object[] { "loggers", LoggersMvcEndpoint.class },
 				new Object[] { "mappings", RequestMappingEndpoint.class },
 				new Object[] { "metrics", MetricsMvcEndpoint.class },
 				new Object[] { "shutdown", ShutdownEndpoint.class },
@@ -151,6 +155,11 @@ public class MvcEndpointPathConfigurationTests {
 			return ConditionEvaluationReport.get(beanFactory);
 		}
 
+		@Bean
+		LoggingSystem loggingSystem() {
+			return LoggingSystem.get(getClass().getClassLoader());
+		}
+
 		@Bean
 		public FlywayEndpoint flyway() {
 			return new FlywayEndpoint(new Flyway());

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/LoggersEndpointTests.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2016-2016 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.actuate.endpoint;
+
+import java.util.Collections;
+
+import org.junit.Test;
+
+import org.springframework.boot.actuate.endpoint.LoggersEndpoint.LoggerLevels;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.logging.LogLevel;
+import org.springframework.boot.logging.LoggerConfiguration;
+import org.springframework.boot.logging.LoggingSystem;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+
+/**
+ * Tests for {@link LoggersEndpoint}.
+ *
+ * @author Ben Hale
+ */
+public class LoggersEndpointTests extends AbstractEndpointTests<LoggersEndpoint> {
+
+	public LoggersEndpointTests() {
+		super(Config.class, LoggersEndpoint.class, "loggers", true, "endpoints.loggers");
+	}
+
+	@Test
+	public void invokeShouldReturnConfigurations() throws Exception {
+		given(getLoggingSystem().getLoggerConfigurations()).willReturn(Collections
+				.singletonList(new LoggerConfiguration("ROOT", null, LogLevel.DEBUG)));
+		LoggerLevels levels = getEndpointBean().invoke().get("ROOT");
+		assertThat(levels.getConfiguredLevel()).isNull();
+		assertThat(levels.getEffectiveLevel()).isEqualTo("DEBUG");
+	}
+
+	public void invokeWhenNameSpecifiedShouldReturnLevels() throws Exception {
+		given(getLoggingSystem().getLoggerConfiguration("ROOT"))
+				.willReturn(new LoggerConfiguration("ROOT", null, LogLevel.DEBUG));
+		LoggerLevels levels = getEndpointBean().invoke("ROOT");
+		assertThat(levels.getConfiguredLevel()).isNull();
+		assertThat(levels.getEffectiveLevel()).isEqualTo("DEBUG");
+	}
+
+	public void setLogLevelShouldSetLevelOnLoggingSystem() throws Exception {
+		getEndpointBean().setLogLevel("ROOT", LogLevel.DEBUG);
+		verify(getLoggingSystem()).setLogLevel("ROOT", LogLevel.DEBUG);
+	}
+
+	private LoggingSystem getLoggingSystem() {
+		return this.context.getBean(LoggingSystem.class);
+	}
+
+	@Configuration
+	@EnableConfigurationProperties
+	public static class Config {
+
+		@Bean
+		public LoggingSystem loggingSystem() {
+			return mock(LoggingSystem.class);
+		}
+
+		@Bean
+		public LoggersEndpoint endpoint(LoggingSystem loggingSystem) {
+			return new LoggersEndpoint(loggingSystem);
+		}
+
+	}
+
+}

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/mvc/HalBrowserMvcEndpointVanillaIntegrationTests.java

@@ -119,7 +119,7 @@ public class HalBrowserMvcEndpointVanillaIntegrationTests {
 	@Test
 	public void endpointsEachHaveSelf() throws Exception {
 		Set<String> collections = new HashSet<String>(
-				Arrays.asList("/trace", "/beans", "/dump", "/heapdump"));
+				Arrays.asList("/trace", "/beans", "/dump", "/heapdump", "/loggers"));
 		for (MvcEndpoint endpoint : this.mvcEndpoints.getEndpoints()) {
 			String path = endpoint.getPath();
 			if (collections.contains(path)) {

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/mvc/LoggersMvcEndpointTests.java

@@ -0,0 +1,159 @@
+/*
+ * Copyright 2016-2016 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.actuate.endpoint.mvc;
+
+import java.util.Collections;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mockito;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration;
+import org.springframework.boot.actuate.autoconfigure.ManagementServerPropertiesAutoConfiguration;
+import org.springframework.boot.actuate.endpoint.LoggersEndpoint;
+import org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration;
+import org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration;
+import org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration;
+import org.springframework.boot.logging.LogLevel;
+import org.springframework.boot.logging.LoggerConfiguration;
+import org.springframework.boot.logging.LoggingSystem;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.result.MockMvcResultHandlers;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+import org.springframework.web.context.WebApplicationContext;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyZeroInteractions;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * Tests for {@link LoggersMvcEndpoint}.
+ *
+ * @author Ben Hale
+ * @author Phillip Webb
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class LoggersMvcEndpointTests {
+
+	@Autowired
+	private WebApplicationContext context;
+
+	@Autowired
+	private LoggingSystem loggingSystem;
+
+	private MockMvc mvc;
+
+	@Before
+	public void setUp() {
+		this.context.getBean(LoggersEndpoint.class).setEnabled(true);
+		this.mvc = MockMvcBuilders.webAppContextSetup(this.context)
+				.alwaysDo(MockMvcResultHandlers.print()).build();
+	}
+
+	@After
+	public void reset() {
+		Mockito.reset(this.loggingSystem);
+	}
+
+	@Test
+	public void getLoggerShouldReturnAllLoggerConfigurations() throws Exception {
+		given(this.loggingSystem.getLoggerConfigurations()).willReturn(Collections
+				.singletonList(new LoggerConfiguration("ROOT", null, LogLevel.DEBUG)));
+		this.mvc.perform(get("/loggers")).andExpect(status().isOk())
+				.andExpect(content().string(equalTo("{\"ROOT\":{\"configuredLevel\":"
+						+ "null,\"effectiveLevel\":\"DEBUG\"}}")));
+	}
+
+	@Test
+	public void getLoggersWhenDisabledShouldReturnNotFound() throws Exception {
+		this.context.getBean(LoggersEndpoint.class).setEnabled(false);
+		this.mvc.perform(get("/loggers")).andExpect(status().isNotFound());
+	}
+
+	@Test
+	public void getLoggerShouldReturnLogLevels() throws Exception {
+		given(this.loggingSystem.getLoggerConfiguration("ROOT"))
+				.willReturn(new LoggerConfiguration("ROOT", null, LogLevel.DEBUG));
+		this.mvc.perform(get("/loggers/ROOT")).andExpect(status().isOk())
+				.andExpect(content().string(equalTo(
+						"{\"configuredLevel\":null," + "\"effectiveLevel\":\"DEBUG\"}")));
+	}
+
+	@Test
+	public void getLoggesWhenDisabledShouldReturnNotFound() throws Exception {
+		this.context.getBean(LoggersEndpoint.class).setEnabled(false);
+		this.mvc.perform(get("/loggers/ROOT")).andExpect(status().isNotFound());
+	}
+
+	@Test
+	public void getLoggersWhenLoggerNotFoundShouldReturnNotFound() throws Exception {
+		this.mvc.perform(get("/loggers/com.does.not.exist"))
+				.andExpect(status().isNotFound());
+	}
+
+	@Test
+	public void setLoggerShouldSetLogLevel() throws Exception {
+		this.mvc.perform(post("/loggers/ROOT").contentType(MediaType.APPLICATION_JSON)
+				.content("{\"configuredLevel\":\"DEBUG\"}")).andExpect(status().isOk());
+		verify(this.loggingSystem).setLogLevel("ROOT", LogLevel.DEBUG);
+	}
+
+	@Test
+	public void setLoggerWhenDisabledShouldReturnNotFound() throws Exception {
+		this.context.getBean(LoggersEndpoint.class).setEnabled(false);
+		this.mvc.perform(post("/loggers/ROOT").contentType(MediaType.APPLICATION_JSON)
+				.content("{\"configuredLevel\":\"DEBUG\"}"))
+				.andExpect(status().isNotFound());
+		verifyZeroInteractions(this.loggingSystem);
+	}
+
+	@Configuration
+	@Import({ JacksonAutoConfiguration.class,
+			HttpMessageConvertersAutoConfiguration.class,
+			EndpointWebMvcAutoConfiguration.class, WebMvcAutoConfiguration.class,
+			ManagementServerPropertiesAutoConfiguration.class })
+	public static class TestConfiguration {
+
+		@Bean
+		public LoggingSystem loggingSystem() {
+			return mock(LoggingSystem.class);
+		}
+
+		@Bean
+		public LoggersEndpoint endpoint(LoggingSystem loggingSystem) {
+			return new LoggersEndpoint(loggingSystem);
+		}
+
+	}
+
+}

spring-boot/src/main/java/org/springframework/boot/logging/AbstractLoggingSystem.java

@@ -16,6 +16,9 @@
 
 package org.springframework.boot.logging;
 
+import java.util.HashMap;
+import java.util.Map;
+
 import org.springframework.core.env.Environment;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.util.ClassUtils;
@@ -173,4 +176,34 @@ public abstract class AbstractLoggingSystem extends LoggingSystem {
 		new LoggingSystemProperties(environment).apply(logFile);
 	}
 
+	/**
+	 * Maintains a mapping between native levels and {@link LogLevel}.
+	 * @param <T> The native level type
+	 */
+	protected static class LogLevels<T> {
+
+		private final Map<LogLevel, T> systemToNative;
+
+		private final Map<T, LogLevel> nativeToSystem;
+
+		public LogLevels() {
+			this.systemToNative = new HashMap<LogLevel, T>();
+			this.nativeToSystem = new HashMap<T, LogLevel>();
+		}
+
+		public void map(LogLevel system, T nativeLevel) {
+			this.systemToNative.put(system, nativeLevel);
+			this.nativeToSystem.put(nativeLevel, system);
+		}
+
+		public LogLevel convertNativeToSystem(T level) {
+			return this.nativeToSystem.get(level);
+		}
+
+		public T convertSystemToNative(LogLevel level) {
+			return this.systemToNative.get(level);
+		}
+
+	}
+
 }

spring-boot/src/main/java/org/springframework/boot/logging/LoggerConfiguration.java

@@ -0,0 +1,111 @@
+/*
+ * Copyright 2016-2016 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.logging;
+
+import org.springframework.util.Assert;
+import org.springframework.util.ObjectUtils;
+
+/**
+ * Immutable class that represents the configuration of a {@link LoggingSystem}'s logger.
+ *
+ * @author Ben Hale
+ * @since 1.5.0
+ */
+public final class LoggerConfiguration {
+
+	private final String name;
+
+	private final LogLevel configuredLevel;
+
+	private final LogLevel effectiveLevel;
+
+	/**
+	 * Create a new {@link LoggerConfiguration instance}.
+	 * @param name the name of the logger
+	 * @param configuredLevel the configured level of the logger
+	 * @param effectiveLevel the effective level of the logger
+	 */
+	public LoggerConfiguration(String name, LogLevel configuredLevel,
+			LogLevel effectiveLevel) {
+		Assert.notNull(name, "Name must not be null");
+		Assert.notNull(effectiveLevel, "EffectiveLevel must not be null");
+		this.name = name;
+		this.configuredLevel = configuredLevel;
+		this.effectiveLevel = effectiveLevel;
+	}
+
+	/**
+	 * Returns the configured level of the logger.
+	 * @return the configured level of the logger
+	 */
+	public LogLevel getConfiguredLevel() {
+		return this.configuredLevel;
+	}
+
+	/**
+	 * Returns the effective level of the logger.
+	 * @return the effective level of the logger
+	 */
+	public LogLevel getEffectiveLevel() {
+		return this.effectiveLevel;
+	}
+
+	/**
+	 * Returns the name of the logger.
+	 * @return the name of the logger
+	 */
+	public String getName() {
+		return this.name;
+	}
+
+	@Override
+	public String toString() {
+		return "LoggerConfiguration [name=" + this.name + ", configuredLevel="
+				+ this.configuredLevel + ", effectiveLevel=" + this.effectiveLevel + "]";
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + ObjectUtils.nullSafeHashCode(this.name);
+		result = prime * result + ObjectUtils.nullSafeHashCode(this.configuredLevel);
+		result = prime * result + ObjectUtils.nullSafeHashCode(this.effectiveLevel);
+		return result;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) {
+			return true;
+		}
+		if (obj == null) {
+			return false;
+		}
+		if (obj instanceof LoggerConfiguration) {
+			LoggerConfiguration other = (LoggerConfiguration) obj;
+			boolean rtn = true;
+			rtn &= ObjectUtils.nullSafeEquals(this.name, other.name);
+			rtn &= ObjectUtils.nullSafeEquals(this.configuredLevel,
+					other.configuredLevel);
+			rtn &= ObjectUtils.nullSafeEquals(this.effectiveLevel, other.effectiveLevel);
+			return rtn;
+		}
+		return super.equals(obj);
+	}
+
+}

spring-boot/src/main/java/org/springframework/boot/logging/LoggerConfigurationComparator.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2016-2016 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.logging;
+
+import java.util.Comparator;
+
+import org.springframework.util.Assert;
+
+/**
+ * An implementation of {@link Comparator} for comparing {@link LoggerConfiguration}s.
+ * Sorts the "root" logger as the first logger and then lexically by name after that.
+ *
+ * @author Ben Hale
+ * @since 1.5.0
+ */
+public class LoggerConfigurationComparator implements Comparator<LoggerConfiguration> {
+
+	private final String rootLoggerName;
+
+	/**
+	 * Create a new {@link LoggerConfigurationComparator} instance.
+	 * @param rootLoggerName the name of the "root" logger
+	 */
+	public LoggerConfigurationComparator(String rootLoggerName) {
+		Assert.notNull(rootLoggerName, "RootLoggerName must not be null");
+		this.rootLoggerName = rootLoggerName;
+	}
+
+	@Override
+	public int compare(LoggerConfiguration o1, LoggerConfiguration o2) {
+		if (this.rootLoggerName.equals(o1.getName())) {
+			return -1;
+		}
+		if (this.rootLoggerName.equals(o2.getName())) {
+			return 1;
+		}
+		return o1.getName().compareTo(o2.getName());
+	}
+
+}

spring-boot/src/main/java/org/springframework/boot/logging/LoggingSystem.java

@@ -18,6 +18,7 @@ package org.springframework.boot.logging;
 
 import java.util.Collections;
 import java.util.LinkedHashMap;
+import java.util.List;
 import java.util.Map;
 
 import org.springframework.util.ClassUtils;
@@ -29,6 +30,7 @@ import org.springframework.util.StringUtils;
  * @author Phillip Webb
  * @author Dave Syer
  * @author Andy Wilkinson
+ * @author Ben Hale
  */
 public abstract class LoggingSystem {
 
@@ -97,7 +99,29 @@ public abstract class LoggingSystem {
 	 * @param loggerName the name of the logger to set
 	 * @param level the log level
 	 */
-	public abstract void setLogLevel(String loggerName, LogLevel level);
+	public void setLogLevel(String loggerName, LogLevel level) {
+		throw new UnsupportedOperationException("Unable to set log level");
+	}
+
+	/**
+	 * Returns a collection of the current configuration for all a {@link LoggingSystem}'s
+	 * loggers.
+	 * @return the current configurations
+	 * @since 1.5.0
+	 */
+	public List<LoggerConfiguration> getLoggerConfigurations() {
+		throw new UnsupportedOperationException("Unable to get logger configurations");
+	}
+
+	/**
+	 * Returns the current configuration for a {@link LoggingSystem}'s logger.
+	 * @param loggerName the name of the logger
+	 * @return the current configuration
+	 * @since 1.5.0
+	 */
+	public LoggerConfiguration getLoggerConfiguration(String loggerName) {
+		throw new UnsupportedOperationException("Unable to get logger configuration");
+	}
 
 	/**
 	 * Detect and return the logging system in use. Supports Logback and Java Logging.
@@ -146,6 +170,16 @@ public abstract class LoggingSystem {
 
 		}
 
+		@Override
+		public List<LoggerConfiguration> getLoggerConfigurations() {
+			return Collections.emptyList();
+		}
+
+		@Override
+		public LoggerConfiguration getLoggerConfiguration(String loggerName) {
+			return null;
+		}
+
 	}
 
 }

spring-boot/src/main/java/org/springframework/boot/logging/java/JavaLoggingSystem.java

@@ -18,9 +18,10 @@ package org.springframework.boot.logging.java;
 
 import java.io.ByteArrayInputStream;
 import java.io.InputStreamReader;
+import java.util.ArrayList;
 import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
+import java.util.Enumeration;
+import java.util.List;
 import java.util.logging.Level;
 import java.util.logging.LogManager;
 import java.util.logging.Logger;
@@ -28,6 +29,8 @@ import java.util.logging.Logger;
 import org.springframework.boot.logging.AbstractLoggingSystem;
 import org.springframework.boot.logging.LogFile;
 import org.springframework.boot.logging.LogLevel;
+import org.springframework.boot.logging.LoggerConfiguration;
+import org.springframework.boot.logging.LoggerConfigurationComparator;
 import org.springframework.boot.logging.LoggingInitializationContext;
 import org.springframework.boot.logging.LoggingSystem;
 import org.springframework.util.Assert;
@@ -41,21 +44,23 @@ import org.springframework.util.StringUtils;
  * @author Phillip Webb
  * @author Dave Syer
  * @author Andy Wilkinson
+ * @author Ben Hale
  */
 public class JavaLoggingSystem extends AbstractLoggingSystem {
 
-	private static final Map<LogLevel, Level> LEVELS;
+	private static final LoggerConfigurationComparator COMPARATOR = new LoggerConfigurationComparator(
+			"");
+
+	private static final LogLevels<Level> LEVELS = new LogLevels<Level>();
 
 	static {
-		Map<LogLevel, Level> levels = new HashMap<LogLevel, Level>();
-		levels.put(LogLevel.TRACE, Level.FINEST);
-		levels.put(LogLevel.DEBUG, Level.FINE);
-		levels.put(LogLevel.INFO, Level.INFO);
-		levels.put(LogLevel.WARN, Level.WARNING);
-		levels.put(LogLevel.ERROR, Level.SEVERE);
-		levels.put(LogLevel.FATAL, Level.SEVERE);
-		levels.put(LogLevel.OFF, Level.OFF);
-		LEVELS = Collections.unmodifiableMap(levels);
+		LEVELS.map(LogLevel.TRACE, Level.FINEST);
+		LEVELS.map(LogLevel.DEBUG, Level.FINE);
+		LEVELS.map(LogLevel.INFO, Level.INFO);
+		LEVELS.map(LogLevel.WARN, Level.WARNING);
+		LEVELS.map(LogLevel.ERROR, Level.SEVERE);
+		LEVELS.map(LogLevel.FATAL, Level.SEVERE);
+		LEVELS.map(LogLevel.OFF, Level.OFF);
 	}
 
 	public JavaLoggingSystem(ClassLoader classLoader) {
@@ -113,7 +118,39 @@ public class JavaLoggingSystem extends AbstractLoggingSystem {
 		Assert.notNull(level, "Level must not be null");
 		String name = (StringUtils.hasText(loggerName) ? loggerName : "");
 		Logger logger = Logger.getLogger(name);
-		logger.setLevel(LEVELS.get(level));
+		if (logger != null) {
+			logger.setLevel(LEVELS.convertSystemToNative(level));
+		}
+	}
+
+	@Override
+	public List<LoggerConfiguration> getLoggerConfigurations() {
+		List<LoggerConfiguration> result = new ArrayList<LoggerConfiguration>();
+		Enumeration<String> names = LogManager.getLogManager().getLoggerNames();
+		while (names.hasMoreElements()) {
+			result.add(getLoggerConfiguration(names.nextElement()));
+		}
+		Collections.sort(result, COMPARATOR);
+		return Collections.unmodifiableList(result);
+	}
+
+	@Override
+	public LoggerConfiguration getLoggerConfiguration(String loggerName) {
+		Logger logger = Logger.getLogger(loggerName);
+		if (logger == null) {
+			return null;
+		}
+		LogLevel level = LEVELS.convertNativeToSystem(logger.getLevel());
+		LogLevel effectiveLevel = LEVELS.convertNativeToSystem(getEffectiveLevel(logger));
+		return new LoggerConfiguration(logger.getName(), level, effectiveLevel);
+	}
+
+	private Level getEffectiveLevel(Logger root) {
+		Logger logger = root;
+		while (logger.getLevel() == null) {
+			logger = logger.getParent();
+		}
+		return logger.getLevel();
 	}
 
 	@Override

spring-boot/src/main/java/org/springframework/boot/logging/log4j2/Log4J2LoggingSystem.java

@@ -21,9 +21,7 @@ import java.io.InputStream;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 
 import org.apache.logging.log4j.Level;
 import org.apache.logging.log4j.LogManager;
@@ -32,6 +30,7 @@ import org.apache.logging.log4j.core.Filter;
 import org.apache.logging.log4j.core.LogEvent;
 import org.apache.logging.log4j.core.Logger;
 import org.apache.logging.log4j.core.LoggerContext;
+import org.apache.logging.log4j.core.config.Configuration;
 import org.apache.logging.log4j.core.config.ConfigurationFactory;
 import org.apache.logging.log4j.core.config.ConfigurationSource;
 import org.apache.logging.log4j.core.config.LoggerConfig;
@@ -40,6 +39,8 @@ import org.apache.logging.log4j.message.Message;
 
 import org.springframework.boot.logging.LogFile;
 import org.springframework.boot.logging.LogLevel;
+import org.springframework.boot.logging.LoggerConfiguration;
+import org.springframework.boot.logging.LoggerConfigurationComparator;
 import org.springframework.boot.logging.LoggingInitializationContext;
 import org.springframework.boot.logging.LoggingSystem;
 import org.springframework.boot.logging.Slf4JLoggingSystem;
@@ -54,24 +55,26 @@ import org.springframework.util.StringUtils;
  * @author Daniel Fullarton
  * @author Andy Wilkinson
  * @author Alexander Heusingfeld
+ * @author Ben Hale
  * @since 1.2.0
  */
 public class Log4J2LoggingSystem extends Slf4JLoggingSystem {
 
+	private static final LoggerConfigurationComparator COMPARATOR = new LoggerConfigurationComparator(
+			LogManager.ROOT_LOGGER_NAME);
+
 	private static final String FILE_PROTOCOL = "file";
 
-	private static final Map<LogLevel, Level> LEVELS;
+	private static final LogLevels<Level> LEVELS = new LogLevels<Level>();
 
 	static {
-		Map<LogLevel, Level> levels = new HashMap<LogLevel, Level>();
-		levels.put(LogLevel.TRACE, Level.TRACE);
-		levels.put(LogLevel.DEBUG, Level.DEBUG);
-		levels.put(LogLevel.INFO, Level.INFO);
-		levels.put(LogLevel.WARN, Level.WARN);
-		levels.put(LogLevel.ERROR, Level.ERROR);
-		levels.put(LogLevel.FATAL, Level.FATAL);
-		levels.put(LogLevel.OFF, Level.OFF);
-		LEVELS = Collections.unmodifiableMap(levels);
+		LEVELS.map(LogLevel.TRACE, Level.TRACE);
+		LEVELS.map(LogLevel.DEBUG, Level.DEBUG);
+		LEVELS.map(LogLevel.INFO, Level.INFO);
+		LEVELS.map(LogLevel.WARN, Level.WARN);
+		LEVELS.map(LogLevel.ERROR, Level.ERROR);
+		LEVELS.map(LogLevel.FATAL, Level.FATAL);
+		LEVELS.map(LogLevel.OFF, Level.OFF);
 	}
 
 	private static final Filter FILTER = new AbstractFilter() {
@@ -196,7 +199,7 @@ public class Log4J2LoggingSystem extends Slf4JLoggingSystem {
 
 	@Override
 	public void setLogLevel(String loggerName, LogLevel logLevel) {
-		Level level = LEVELS.get(logLevel);
+		Level level = LEVELS.convertSystemToNative(logLevel);
 		LoggerConfig loggerConfig = getLoggerConfig(loggerName);
 		if (loggerConfig == null) {
 			loggerConfig = new LoggerConfig(loggerName, level, true);
@@ -208,6 +211,30 @@ public class Log4J2LoggingSystem extends Slf4JLoggingSystem {
 		getLoggerContext().updateLoggers();
 	}
 
+	@Override
+	public List<LoggerConfiguration> getLoggerConfigurations() {
+		List<LoggerConfiguration> result = new ArrayList<LoggerConfiguration>();
+		Configuration configuration = getLoggerContext().getConfiguration();
+		for (LoggerConfig loggerConfig : configuration.getLoggers().values()) {
+			result.add(convertLoggerConfiguration(loggerConfig));
+		}
+		Collections.sort(result, COMPARATOR);
+		return result;
+	}
+
+	@Override
+	public LoggerConfiguration getLoggerConfiguration(String loggerName) {
+		return convertLoggerConfiguration(getLoggerConfig(loggerName));
+	}
+
+	private LoggerConfiguration convertLoggerConfiguration(LoggerConfig loggerConfig) {
+		if (loggerConfig == null) {
+			return null;
+		}
+		LogLevel level = LEVELS.convertNativeToSystem(loggerConfig.getLevel());
+		return new LoggerConfiguration(loggerConfig.getName(), level, level);
+	}
+
 	@Override
 	public Runnable getShutdownHandler() {
 		return new ShutdownHandler();

spring-boot/src/main/java/org/springframework/boot/logging/logback/LogbackLoggingSystem.java

@@ -19,10 +19,9 @@ package org.springframework.boot.logging.logback;
 import java.net.URL;
 import java.security.CodeSource;
 import java.security.ProtectionDomain;
+import java.util.ArrayList;
 import java.util.Collections;
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 
 import ch.qos.logback.classic.Level;
 import ch.qos.logback.classic.LoggerContext;
@@ -40,6 +39,8 @@ import org.slf4j.impl.StaticLoggerBinder;
 
 import org.springframework.boot.logging.LogFile;
 import org.springframework.boot.logging.LogLevel;
+import org.springframework.boot.logging.LoggerConfiguration;
+import org.springframework.boot.logging.LoggerConfigurationComparator;
 import org.springframework.boot.logging.LoggingInitializationContext;
 import org.springframework.boot.logging.LoggingSystem;
 import org.springframework.boot.logging.Slf4JLoggingSystem;
@@ -53,23 +54,25 @@ import org.springframework.util.StringUtils;
  * @author Phillip Webb
  * @author Dave Syer
  * @author Andy Wilkinson
+ * @author Ben Hale
  */
 public class LogbackLoggingSystem extends Slf4JLoggingSystem {
 
+	private static final LoggerConfigurationComparator COMPARATOR = new LoggerConfigurationComparator(
+			Logger.ROOT_LOGGER_NAME);
+
 	private static final String CONFIGURATION_FILE_PROPERTY = "logback.configurationFile";
 
-	private static final Map<LogLevel, Level> LEVELS;
+	private static final LogLevels<Level> LEVELS = new LogLevels<Level>();
 
 	static {
-		Map<LogLevel, Level> levels = new HashMap<LogLevel, Level>();
-		levels.put(LogLevel.TRACE, Level.TRACE);
-		levels.put(LogLevel.DEBUG, Level.DEBUG);
-		levels.put(LogLevel.INFO, Level.INFO);
-		levels.put(LogLevel.WARN, Level.WARN);
-		levels.put(LogLevel.ERROR, Level.ERROR);
-		levels.put(LogLevel.FATAL, Level.ERROR);
-		levels.put(LogLevel.OFF, Level.OFF);
-		LEVELS = Collections.unmodifiableMap(levels);
+		LEVELS.map(LogLevel.TRACE, Level.TRACE);
+		LEVELS.map(LogLevel.DEBUG, Level.DEBUG);
+		LEVELS.map(LogLevel.INFO, Level.INFO);
+		LEVELS.map(LogLevel.WARN, Level.WARN);
+		LEVELS.map(LogLevel.ERROR, Level.ERROR);
+		LEVELS.map(LogLevel.FATAL, Level.ERROR);
+		LEVELS.map(LogLevel.OFF, Level.OFF);
 	}
 
 	private static final TurboFilter FILTER = new TurboFilter() {
@@ -209,9 +212,38 @@ public class LogbackLoggingSystem extends Slf4JLoggingSystem {
 		System.setProperty("org.jboss.logging.provider", "slf4j");
 	}
 
+	@Override
+	public List<LoggerConfiguration> getLoggerConfigurations() {
+		List<LoggerConfiguration> result = new ArrayList<LoggerConfiguration>();
+		for (ch.qos.logback.classic.Logger logger : getLoggerContext().getLoggerList()) {
+			result.add(getLoggerConfiguration(logger));
+		}
+		Collections.sort(result, COMPARATOR);
+		return result;
+	}
+
+	@Override
+	public LoggerConfiguration getLoggerConfiguration(String loggerName) {
+		return getLoggerConfiguration(getLogger(loggerName));
+	}
+
+	private LoggerConfiguration getLoggerConfiguration(
+			ch.qos.logback.classic.Logger logger) {
+		if (logger == null) {
+			return null;
+		}
+		LogLevel level = LEVELS.convertNativeToSystem(logger.getLevel());
+		LogLevel effectiveLevel = LEVELS
+				.convertNativeToSystem(logger.getEffectiveLevel());
+		return new LoggerConfiguration(logger.getName(), level, effectiveLevel);
+	}
+
 	@Override
 	public void setLogLevel(String loggerName, LogLevel level) {
-		getLogger(loggerName).setLevel(LEVELS.get(level));
+		ch.qos.logback.classic.Logger logger = getLogger(loggerName);
+		if (logger != null) {
+			logger.setLevel(LEVELS.convertSystemToNative(level));
+		}
 	}
 
 	@Override
@@ -221,8 +253,8 @@ public class LogbackLoggingSystem extends Slf4JLoggingSystem {
 
 	private ch.qos.logback.classic.Logger getLogger(String name) {
 		LoggerContext factory = getLoggerContext();
-		return factory
-				.getLogger(StringUtils.isEmpty(name) ? Logger.ROOT_LOGGER_NAME : name);
+		name = (StringUtils.isEmpty(name) ? Logger.ROOT_LOGGER_NAME : name);
+		return factory.getLogger(name);
 
 	}
 

spring-boot/src/test/java/org/springframework/boot/logging/LoggerConfigurationComparatorTests.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2016-2016 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.logging;
+
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link LoggerConfigurationComparator}.
+ *
+ * @author Ben Hale
+ */
+public class LoggerConfigurationComparatorTests {
+
+	private final LoggerConfigurationComparator comparator = new LoggerConfigurationComparator(
+			"ROOT");
+
+	@Test
+	public void rootLoggerFirst() {
+		LoggerConfiguration first = new LoggerConfiguration("ROOT", null, LogLevel.OFF);
+		LoggerConfiguration second = new LoggerConfiguration("alpha", null, LogLevel.OFF);
+		assertThat(this.comparator.compare(first, second)).isLessThan(0);
+	}
+
+	@Test
+	public void rootLoggerSecond() {
+		LoggerConfiguration first = new LoggerConfiguration("alpha", null, LogLevel.OFF);
+		LoggerConfiguration second = new LoggerConfiguration("ROOT", null, LogLevel.OFF);
+		assertThat(this.comparator.compare(first, second)).isGreaterThan(0);
+	}
+
+	@Test
+	public void rootLoggerFirstEmpty() {
+		LoggerConfiguration first = new LoggerConfiguration("ROOT", null, LogLevel.OFF);
+		LoggerConfiguration second = new LoggerConfiguration("", null, LogLevel.OFF);
+		assertThat(this.comparator.compare(first, second)).isLessThan(0);
+	}
+
+	@Test
+	public void rootLoggerSecondEmpty() {
+		LoggerConfiguration first = new LoggerConfiguration("", null, LogLevel.OFF);
+		LoggerConfiguration second = new LoggerConfiguration("ROOT", null, LogLevel.OFF);
+		assertThat(this.comparator.compare(first, second)).isGreaterThan(0);
+	}
+
+	@Test
+	public void lexicalFirst() {
+		LoggerConfiguration first = new LoggerConfiguration("alpha", null, LogLevel.OFF);
+		LoggerConfiguration second = new LoggerConfiguration("bravo", null, LogLevel.OFF);
+		assertThat(this.comparator.compare(first, second)).isLessThan(0);
+	}
+
+	@Test
+	public void lexicalSecond() {
+		LoggerConfiguration first = new LoggerConfiguration("bravo", null, LogLevel.OFF);
+		LoggerConfiguration second = new LoggerConfiguration("alpha", null, LogLevel.OFF);
+		assertThat(this.comparator.compare(first, second)).isGreaterThan(0);
+	}
+
+	@Test
+	public void lexicalEqual() {
+		LoggerConfiguration first = new LoggerConfiguration("alpha", null, LogLevel.OFF);
+		LoggerConfiguration second = new LoggerConfiguration("alpha", null, LogLevel.OFF);
+		assertThat(this.comparator.compare(first, second)).isEqualTo(0);
+	}
+
+}

spring-boot/src/test/java/org/springframework/boot/logging/LoggingApplicationListenerTests.java

@@ -18,6 +18,7 @@ package org.springframework.boot.logging;
 
 import java.io.File;
 import java.io.IOException;
+import java.util.List;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import java.util.logging.Handler;
@@ -57,6 +58,7 @@ import static org.hamcrest.Matchers.not;
  * @author Phillip Webb
  * @author Andy Wilkinson
  * @author Stephane Nicoll
+ * @author Ben Hale
  */
 public class LoggingApplicationListenerTests {
 
@@ -518,7 +520,16 @@ public class LoggingApplicationListenerTests {
 
 		@Override
 		public void setLogLevel(String loggerName, LogLevel level) {
+		}
 
+		@Override
+		public List<LoggerConfiguration> getLoggerConfigurations() {
+			return null;
+		}
+
+		@Override
+		public LoggerConfiguration getLoggerConfiguration(String loggerName) {
+			return null;
 		}
 
 		@Override
@@ -552,17 +563,24 @@ public class LoggingApplicationListenerTests {
 		private boolean cleanedUp = false;
 
 		public TestCleanupLoggingSystem(ClassLoader classLoader) {
-
 		}
 
 		@Override
 		public void beforeInitialize() {
-
 		}
 
 		@Override
 		public void setLogLevel(String loggerName, LogLevel level) {
+		}
 
+		@Override
+		public List<LoggerConfiguration> getLoggerConfigurations() {
+			return null;
+		}
+
+		@Override
+		public LoggerConfiguration getLoggerConfiguration(String loggerName) {
+			return null;
 		}
 
 		@Override

spring-boot/src/test/java/org/springframework/boot/logging/LoggingSystemTests.java

@@ -42,4 +42,28 @@ public class LoggingSystemTests {
 		assertThat(loggingSystem).isInstanceOf(NoOpLoggingSystem.class);
 	}
 
+	@Test(expected = UnsupportedOperationException.class)
+	public void getLoggerConfigurationIsUnsupported() {
+		new StubLoggingSystem().getLoggerConfiguration("test-logger-name");
+	}
+
+	@Test(expected = UnsupportedOperationException.class)
+	public void listLoggerConfigurationsIsUnsupported() {
+		new StubLoggingSystem().getLoggerConfigurations();
+	}
+
+	private static final class StubLoggingSystem extends LoggingSystem {
+
+		@Override
+		public void beforeInitialize() {
+			// Stub implementation
+		}
+
+		@Override
+		public void setLogLevel(String loggerName, LogLevel level) {
+			// Stub implementation
+		}
+
+	}
+
 }

spring-boot/src/test/java/org/springframework/boot/logging/java/JavaLoggingSystemTests.java

@@ -19,7 +19,9 @@ package org.springframework.boot.logging.java;
 import java.io.File;
 import java.io.FileFilter;
 import java.io.IOException;
+import java.util.List;
 import java.util.Locale;
+import java.util.logging.Level;
 
 import org.apache.commons.logging.impl.Jdk14Logger;
 import org.junit.After;
@@ -29,6 +31,7 @@ import org.junit.Test;
 
 import org.springframework.boot.logging.AbstractLoggingSystemTests;
 import org.springframework.boot.logging.LogLevel;
+import org.springframework.boot.logging.LoggerConfiguration;
 import org.springframework.boot.testutil.InternalOutputCapture;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.StringUtils;
@@ -40,6 +43,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Dave Syer
  * @author Phillip Webb
+ * @author Ben Hale
  */
 public class JavaLoggingSystemTests extends AbstractLoggingSystemTests {
 
@@ -74,6 +78,11 @@ public class JavaLoggingSystemTests extends AbstractLoggingSystemTests {
 		Locale.setDefault(this.defaultLocale);
 	}
 
+	@After
+	public void resetLogger() {
+		this.logger.getLogger().setLevel(Level.OFF);
+	}
+
 	@Test
 	public void noFile() throws Exception {
 		this.loggingSystem.beforeInitialize();
@@ -150,4 +159,26 @@ public class JavaLoggingSystemTests extends AbstractLoggingSystemTests {
 				.isEqualTo(1);
 	}
 
+	@Test
+	public void getLoggingConfigurations() throws Exception {
+		this.loggingSystem.beforeInitialize();
+		this.loggingSystem.initialize(null, null, null);
+		this.loggingSystem.setLogLevel(getClass().getName(), LogLevel.DEBUG);
+		List<LoggerConfiguration> configurations = this.loggingSystem
+				.getLoggerConfigurations();
+		assertThat(configurations).isNotEmpty();
+		assertThat(configurations.get(0).getName()).isEmpty();
+	}
+
+	@Test
+	public void getLoggingConfiguration() throws Exception {
+		this.loggingSystem.beforeInitialize();
+		this.loggingSystem.initialize(null, null, null);
+		this.loggingSystem.setLogLevel(getClass().getName(), LogLevel.DEBUG);
+		LoggerConfiguration configuration = this.loggingSystem
+				.getLoggerConfiguration(getClass().getName());
+		assertThat(configuration).isEqualTo(new LoggerConfiguration(getClass().getName(),
+				LogLevel.DEBUG, LogLevel.DEBUG));
+	}
+
 }

spring-boot/src/test/java/org/springframework/boot/logging/log4j2/Log4J2LoggingSystemTests.java

@@ -38,6 +38,7 @@ import org.junit.Test;
 
 import org.springframework.boot.logging.AbstractLoggingSystemTests;
 import org.springframework.boot.logging.LogLevel;
+import org.springframework.boot.logging.LoggerConfiguration;
 import org.springframework.boot.testutil.InternalOutputCapture;
 import org.springframework.boot.testutil.Matched;
 import org.springframework.util.FileCopyUtils;
@@ -57,6 +58,7 @@ import static org.mockito.Mockito.verify;
  * @author Daniel Fullarton
  * @author Phillip Webb
  * @author Andy Wilkinson
+ * @author Ben Hale
  */
 public class Log4J2LoggingSystemTests extends AbstractLoggingSystemTests {
 
@@ -131,6 +133,28 @@ public class Log4J2LoggingSystemTests extends AbstractLoggingSystemTests {
 				.isEqualTo(1);
 	}
 
+	@Test
+	public void getLoggingConfigurations() throws Exception {
+		this.loggingSystem.beforeInitialize();
+		this.loggingSystem.initialize(null, null, null);
+		this.loggingSystem.setLogLevel(getClass().getName(), LogLevel.DEBUG);
+		List<LoggerConfiguration> configurations = this.loggingSystem
+				.getLoggerConfigurations();
+		assertThat(configurations).isNotEmpty();
+		assertThat(configurations.get(0).getName()).isEmpty();
+	}
+
+	@Test
+	public void getLoggingConfiguration() throws Exception {
+		this.loggingSystem.beforeInitialize();
+		this.loggingSystem.initialize(null, null, null);
+		this.loggingSystem.setLogLevel(getClass().getName(), LogLevel.DEBUG);
+		LoggerConfiguration configuration = this.loggingSystem
+				.getLoggerConfiguration(getClass().getName());
+		assertThat(configuration).isEqualTo(new LoggerConfiguration(getClass().getName(),
+				LogLevel.DEBUG, LogLevel.DEBUG));
+	}
+
 	@Test
 	public void setLevelOfUnconfiguredLoggerDoesNotAffectRootConfiguration()
 			throws Exception {

spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackLoggingSystemTests.java

@@ -18,6 +18,7 @@ package org.springframework.boot.logging.logback;
 
 import java.io.File;
 import java.io.FileReader;
+import java.util.List;
 import java.util.logging.Handler;
 import java.util.logging.LogManager;
 
@@ -39,6 +40,7 @@ import org.slf4j.impl.StaticLoggerBinder;
 import org.springframework.boot.logging.AbstractLoggingSystemTests;
 import org.springframework.boot.logging.LogFile;
 import org.springframework.boot.logging.LogLevel;
+import org.springframework.boot.logging.LoggerConfiguration;
 import org.springframework.boot.logging.LoggingInitializationContext;
 import org.springframework.boot.testutil.InternalOutputCapture;
 import org.springframework.boot.testutil.Matched;
@@ -59,6 +61,7 @@ import static org.mockito.Mockito.verify;
  * @author Dave Syer
  * @author Phillip Webb
  * @author Andy Wilkinson
+ * @author Ben Hale
  */
 public class LogbackLoggingSystemTests extends AbstractLoggingSystemTests {
 
@@ -170,6 +173,29 @@ public class LogbackLoggingSystemTests extends AbstractLoggingSystemTests {
 				.isEqualTo(1);
 	}
 
+	@Test
+	public void getLoggingConfigurations() throws Exception {
+		this.loggingSystem.beforeInitialize();
+		this.loggingSystem.initialize(this.initializationContext, null, null);
+		this.loggingSystem.setLogLevel(getClass().getName(), LogLevel.DEBUG);
+		List<LoggerConfiguration> configurations = this.loggingSystem
+				.getLoggerConfigurations();
+		assertThat(configurations).isNotEmpty();
+		assertThat(configurations.get(0).getName())
+				.isEqualTo(org.slf4j.Logger.ROOT_LOGGER_NAME);
+	}
+
+	@Test
+	public void getLoggingConfiguration() throws Exception {
+		this.loggingSystem.beforeInitialize();
+		this.loggingSystem.initialize(this.initializationContext, null, null);
+		this.loggingSystem.setLogLevel(getClass().getName(), LogLevel.DEBUG);
+		LoggerConfiguration configuration = this.loggingSystem
+				.getLoggerConfiguration(getClass().getName());
+		assertThat(configuration).isEqualTo(new LoggerConfiguration(getClass().getName(),
+				LogLevel.DEBUG, LogLevel.DEBUG));
+	}
+
 	@Test
 	public void loggingThatUsesJulIsCaptured() {
 		this.loggingSystem.beforeInitialize();