Merge pull request #5162 from Kazuki Shimizu

* gh-5126:
  Auto-configure ResourceUrlEncodingFilter when using FreeMarker

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

 /*
- * 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.
@@ -35,6 +35,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnNotWebAppli
 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.ConditionalOnEnabledResourceChain;
 import org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.ApplicationContext;
@@ -42,6 +43,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.ui.freemarker.FreeMarkerConfigurationFactory;
 import org.springframework.ui.freemarker.FreeMarkerConfigurationFactoryBean;
+import org.springframework.web.servlet.resource.ResourceUrlEncodingFilter;
 import org.springframework.web.servlet.view.freemarker.FreeMarkerConfig;
 import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;
 import org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver;
@@ -51,6 +53,7 @@ import org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver;
  *
  * @author Andy Wilkinson
  * @author Dave Syer
+ * @author Kazuki Shimizu
  * @since 1.1.0
  */
 @Configuration
@@ -149,5 +152,12 @@ public class FreeMarkerAutoConfiguration {
 			return resolver;
 		}
 
+		@Bean
+		@ConditionalOnMissingBean
+		@ConditionalOnEnabledResourceChain
+		public ResourceUrlEncodingFilter resourceUrlEncodingFilter() {
+			return new ResourceUrlEncodingFilter();
+		}
+
 	}
 }

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/freemarker/FreeMarkerAutoConfigurationTests.java

 /*
- * 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.
@@ -36,6 +36,7 @@ import org.springframework.mock.web.MockServletContext;
 import org.springframework.test.util.ReflectionTestUtils;
 import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
 import org.springframework.web.servlet.View;
+import org.springframework.web.servlet.resource.ResourceUrlEncodingFilter;
 import org.springframework.web.servlet.support.RequestContext;
 import org.springframework.web.servlet.view.AbstractTemplateViewResolver;
 import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;
@@ -48,6 +49,7 @@ import static org.hamcrest.Matchers.containsString;
  * Tests for {@link FreeMarkerAutoConfiguration}.
  *
  * @author Andy Wilkinson
+ * @author Kazuki Shimizu
  */
 public class FreeMarkerAutoConfigurationTests {
 
@@ -189,6 +191,20 @@ public class FreeMarkerAutoConfigurationTests {
 		}
 	}
 
+	@Test
+	public void registerResourceHandlingFilterDisabledByDefault() throws Exception {
+		registerAndRefreshContext();
+		assertThat(this.context.getBeansOfType(ResourceUrlEncodingFilter.class))
+				.isEmpty();
+	}
+
+	@Test
+	public void registerResourceHandlingFilterOnlyIfResourceChainIsEnabled()
+			throws Exception {
+		registerAndRefreshContext("spring.resources.chain.enabled:true");
+		assertThat(this.context.getBean(ResourceUrlEncodingFilter.class)).isNotNull();
+	}
+
 	private void registerAndRefreshContext(String... env) {
 		EnvironmentTestUtils.addEnvironment(this.context, env);
 		this.context.register(FreeMarkerAutoConfiguration.class);

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -1509,9 +1509,10 @@ for all static resources, effectively adding a content hash in URLs, such as
 ----
 
 NOTE: Links to resources are rewritten at runtime in template, thanks to a
-`ResourceUrlEncodingFilter`, auto-configured for Thymeleaf and Velocity. You should
-manually declare this filter when using JSPs. Other template engines aren't automatically
-supported right now, but can be with custom template macros/helpers and the use of the
+`ResourceUrlEncodingFilter`, auto-configured for Thymeleaf, Velocity and FreeMarker. You
+should manually declare this filter when using JSPs. Other template engines aren't
+automatically supported right now, but can be with custom template macros/helpers and the
+use of the
 {spring-javadoc}/web/servlet/resource/ResourceUrlProvider.{dc-ext}[`ResourceUrlProvider`].
 
 When loading resources dynamically with, for example, a JavaScript module loader, renaming