Scan full classpath with /templates checks

Update template auto configurations to search for template folders in
the entire classpath rather than just the root jar.

Fixes gh-2184

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/freemarker/FreeMarkerAutoConfiguration.java

@@ -31,13 +31,12 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean
 import org.springframework.boot.autoconfigure.condition.ConditionalOnNotWebApplication;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
+import org.springframework.boot.autoconfigure.template.TemplateLocation;
 import org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.core.io.DefaultResourceLoader;
-import org.springframework.core.io.Resource;
-import org.springframework.core.io.ResourceLoader;
 import org.springframework.ui.freemarker.FreeMarkerConfigurationFactory;
 import org.springframework.ui.freemarker.FreeMarkerConfigurationFactoryBean;
 import org.springframework.util.Assert;
@@ -60,7 +59,7 @@ import org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver;
 public class FreeMarkerAutoConfiguration {
 
 	@Autowired
-	private final ResourceLoader resourceLoader = new DefaultResourceLoader();
+	private ApplicationContext applicationContext;
 
 	@Autowired
 	private FreeMarkerProperties properties;
@@ -68,18 +67,18 @@ public class FreeMarkerAutoConfiguration {
 	@PostConstruct
 	public void checkTemplateLocationExists() {
 		if (this.properties.isCheckTemplateLocation()) {
-			Resource templatePathResource = null;
-			List<Resource> resources = new ArrayList<Resource>();
+			TemplateLocation templatePathLocation = null;
+			List<TemplateLocation> locations = new ArrayList<TemplateLocation>();
 			for (String templateLoaderPath : this.properties.getTemplateLoaderPath()) {
-				Resource resource = this.resourceLoader.getResource(templateLoaderPath);
-				resources.add(resource);
-				if (resource.exists()) {
-					templatePathResource = resource;
+				TemplateLocation location = new TemplateLocation(templateLoaderPath);
+				locations.add(location);
+				if (location.exists(this.applicationContext)) {
+					templatePathLocation = location;
 					break;
 				}
 			}
-			Assert.notNull(templatePathResource, "Cannot find template location(s): "
-					+ resources + " (please add some templates, "
+			Assert.notNull(templatePathLocation, "Cannot find template location(s): "
+					+ locations + " (please add some templates, "
 					+ "check your FreeMarker configuration, or set "
 					+ "spring.freemarker.checkTemplateLocation=false)");
 		}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/groovy/template/GroovyTemplateAutoConfiguration.java

@@ -30,16 +30,15 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
+import org.springframework.boot.autoconfigure.template.TemplateLocation;
 import org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.i18n.LocaleContextHolder;
 import org.springframework.core.Ordered;
-import org.springframework.core.io.DefaultResourceLoader;
-import org.springframework.core.io.Resource;
-import org.springframework.core.io.ResourceLoader;
 import org.springframework.util.Assert;
 import org.springframework.web.servlet.view.UrlBasedViewResolver;
 import org.springframework.web.servlet.view.groovy.GroovyMarkupConfig;
@@ -68,7 +67,7 @@ public class GroovyTemplateAutoConfiguration {
 	public static class GroovyMarkupConfiguration {
 
 		@Autowired
-		private final ResourceLoader resourceLoader = new DefaultResourceLoader();
+		private ApplicationContext applicationContext;
 
 		@Autowired
 		private GroovyTemplateProperties properties;
@@ -79,12 +78,13 @@ public class GroovyTemplateAutoConfiguration {
 		@PostConstruct
 		public void checkTemplateLocationExists() {
 			if (this.properties.isCheckTemplateLocation() && !isUsingGroovyAllJar()) {
-				Resource resource = this.resourceLoader.getResource(this.properties
-						.getPrefix());
-				Assert.state(resource.exists(), "Cannot find template location: "
-						+ resource + " (please add some templates, "
-						+ "check your Groovy configuration, or set "
-						+ "spring.groovy.template.check-template-location=false)");
+				TemplateLocation location = new TemplateLocation(
+						this.properties.getPrefix());
+				Assert.state(location.exists(this.applicationContext),
+						"Cannot find template location: " + location
+								+ " (please add some templates, check your Groovy "
+								+ "configuration, or set spring.groovy.template."
+								+ "check-template-location=false)");
 			}
 		}
 

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/template/TemplateLocation.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2012-2014 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.template;
+
+import java.io.IOException;
+
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.ResourceLoader;
+import org.springframework.core.io.support.ResourcePatternResolver;
+import org.springframework.util.Assert;
+
+/**
+ * Contains a location that templates can be loaded from.
+ *
+ * @author Phillip Webb
+ * @since 1.2.1
+ */
+public class TemplateLocation {
+
+	private final String path;
+
+	public TemplateLocation(String path) {
+		Assert.notNull(path, "Path must not be null");
+		this.path = path;
+	}
+
+	/**
+	 * Determine if this template location exists using the specified
+	 * {@link ResourcePatternResolver}.
+	 * @param resolver the resolver used to test if the location exists
+	 * @return {@code true} if the location exists.
+	 */
+	public boolean exists(ResourcePatternResolver resolver) {
+		Assert.notNull(resolver, "Resolver must not be null");
+		if (resolver.getResource(this.path).exists()) {
+			return true;
+		}
+		try {
+			if (anyExists(resolver)) {
+				return true;
+			}
+		}
+		catch (IOException ex) {
+		}
+		return false;
+	}
+
+	private boolean anyExists(ResourcePatternResolver resolver) throws IOException {
+		String searchPath = this.path;
+		if (searchPath.startsWith(ResourceLoader.CLASSPATH_URL_PREFIX)) {
+			searchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX
+					+ searchPath.substring(ResourceLoader.CLASSPATH_URL_PREFIX.length());
+		}
+		if (this.path.startsWith(ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX)) {
+			Resource[] resources = resolver.getResources(this.path);
+			for (Resource resource : resources) {
+				if (resource.exists()) {
+					return true;
+				}
+			}
+		}
+		return false;
+	}
+
+	@Override
+	public String toString() {
+		return this.path;
+	}
+
+}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafAutoConfiguration.java

@@ -31,14 +31,13 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
+import org.springframework.boot.autoconfigure.template.TemplateLocation;
 import org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.Ordered;
-import org.springframework.core.io.DefaultResourceLoader;
-import org.springframework.core.io.Resource;
-import org.springframework.core.io.ResourceLoader;
 import org.springframework.util.Assert;
 import org.thymeleaf.dialect.IDialect;
 import org.thymeleaf.extras.conditionalcomments.dialect.ConditionalCommentsDialect;
@@ -72,17 +71,18 @@ public class ThymeleafAutoConfiguration {
 		private ThymeleafProperties properties;
 
 		@Autowired
-		private final ResourceLoader resourceLoader = new DefaultResourceLoader();
+		private ApplicationContext applicationContext;
 
 		@PostConstruct
 		public void checkTemplateLocationExists() {
-			Boolean checkTemplateLocation = this.properties.isCheckTemplateLocation();
+			boolean checkTemplateLocation = this.properties.isCheckTemplateLocation();
 			if (checkTemplateLocation) {
-				Resource resource = this.resourceLoader.getResource(this.properties
-						.getPrefix());
-				Assert.state(resource.exists(), "Cannot find template location: "
-						+ resource + " (please add some templates "
-						+ "or check your Thymeleaf configuration)");
+				TemplateLocation location = new TemplateLocation(
+						this.properties.getPrefix());
+				Assert.state(location.exists(this.applicationContext),
+						"Cannot find template location: " + location
+								+ " (please add some templates or check "
+								+ "your Thymeleaf configuration)");
 			}
 		}
 

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/velocity/VelocityAutoConfiguration.java

@@ -32,13 +32,12 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean
 import org.springframework.boot.autoconfigure.condition.ConditionalOnNotWebApplication;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
+import org.springframework.boot.autoconfigure.template.TemplateLocation;
 import org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.core.io.DefaultResourceLoader;
-import org.springframework.core.io.Resource;
-import org.springframework.core.io.ResourceLoader;
 import org.springframework.ui.velocity.VelocityEngineFactory;
 import org.springframework.ui.velocity.VelocityEngineFactoryBean;
 import org.springframework.util.Assert;
@@ -59,7 +58,7 @@ import org.springframework.web.servlet.view.velocity.VelocityViewResolver;
 public class VelocityAutoConfiguration {
 
 	@Autowired
-	private final ResourceLoader resourceLoader = new DefaultResourceLoader();
+	private ApplicationContext applicationContext;
 
 	@Autowired
 	private VelocityProperties properties;
@@ -67,11 +66,13 @@ public class VelocityAutoConfiguration {
 	@PostConstruct
 	public void checkTemplateLocationExists() {
 		if (this.properties.isCheckTemplateLocation()) {
-			Resource resource = this.resourceLoader.getResource(this.properties
-					.getResourceLoaderPath());
-			Assert.state(resource.exists(), "Cannot find template location: " + resource
-					+ " (please add some templates, check your Velocity configuration, "
-					+ "or set spring.velocity.checkTemplateLocation=false)");
+			TemplateLocation location = new TemplateLocation(
+					this.properties.getResourceLoaderPath());
+			Assert.state(location.exists(this.applicationContext),
+					"Cannot find template location: " + location
+							+ " (please add some templates, check your Velocity "
+							+ "configuration, or set spring.velocity."
+							+ "checkTemplateLocation=false)");
 		}
 	}