Polish "Make sure cache busting works with error pages"

Closes gh-14583

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

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.autoconfigure.freemarker;
 
+import javax.servlet.DispatcherType;
 import javax.servlet.Servlet;
 
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
@@ -25,6 +26,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
 import org.springframework.boot.autoconfigure.web.ConditionalOnEnabledResourceChain;
 import org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration;
+import org.springframework.boot.web.servlet.FilterRegistrationBean;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.web.servlet.resource.ResourceUrlEncodingFilter;
@@ -74,8 +76,11 @@ class FreeMarkerServletWebConfiguration extends AbstractFreeMarkerConfiguration
 	@Bean
 	@ConditionalOnMissingBean
 	@ConditionalOnEnabledResourceChain
-	public ResourceUrlEncodingFilter resourceUrlEncodingFilter() {
-		return new ResourceUrlEncodingFilter();
+	public FilterRegistrationBean<ResourceUrlEncodingFilter> resourceUrlEncodingFilter() {
+		FilterRegistrationBean<ResourceUrlEncodingFilter> registration = new FilterRegistrationBean<>(
+				new ResourceUrlEncodingFilter());
+		registration.setDispatcherTypes(DispatcherType.REQUEST, DispatcherType.ERROR);
+		return registration;
 	}
 
 }

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

@@ -169,12 +169,11 @@ public class ThymeleafAutoConfiguration {
 		@Bean
 		@ConditionalOnMissingBean
 		@ConditionalOnEnabledResourceChain
-		public FilterRegistrationBean resourceUrlEncodingFilter() {
-			FilterRegistrationBean<ResourceUrlEncodingFilter> filterRegistrationBean = new FilterRegistrationBean<>(
+		public FilterRegistrationBean<ResourceUrlEncodingFilter> resourceUrlEncodingFilter() {
+			FilterRegistrationBean<ResourceUrlEncodingFilter> registration = new FilterRegistrationBean<>(
 					new ResourceUrlEncodingFilter());
-			filterRegistrationBean.setDispatcherTypes(DispatcherType.REQUEST,
-					DispatcherType.ERROR);
-			return filterRegistrationBean;
+			registration.setDispatcherTypes(DispatcherType.REQUEST, DispatcherType.ERROR);
+			return registration;
 		}
 
 		@Configuration

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -17,8 +17,10 @@
 package org.springframework.boot.autoconfigure.freemarker;
 
 import java.io.StringWriter;
+import java.util.EnumSet;
 import java.util.Locale;
 
+import javax.servlet.DispatcherType;
 import javax.servlet.http.HttpServletRequest;
 
 import org.junit.After;
@@ -26,6 +28,7 @@ import org.junit.Before;
 import org.junit.Test;
 
 import org.springframework.boot.test.util.TestPropertyValues;
+import org.springframework.boot.web.servlet.FilterRegistrationBean;
 import org.springframework.mock.web.MockHttpServletRequest;
 import org.springframework.mock.web.MockHttpServletResponse;
 import org.springframework.mock.web.MockServletContext;
@@ -153,14 +156,18 @@ public class FreeMarkerAutoConfigurationServletIntegrationTests {
 	@Test
 	public void registerResourceHandlingFilterDisabledByDefault() {
 		registerAndRefreshContext();
-		assertThat(this.context.getBeansOfType(ResourceUrlEncodingFilter.class))
-				.isEmpty();
+		assertThat(this.context.getBeansOfType(FilterRegistrationBean.class)).isEmpty();
 	}
 
 	@Test
 	public void registerResourceHandlingFilterOnlyIfResourceChainIsEnabled() {
 		registerAndRefreshContext("spring.resources.chain.enabled:true");
-		assertThat(this.context.getBean(ResourceUrlEncodingFilter.class)).isNotNull();
+		FilterRegistrationBean<?> registration = this.context
+				.getBean(FilterRegistrationBean.class);
+		assertThat(registration.getFilter())
+				.isInstanceOf(ResourceUrlEncodingFilter.class);
+		assertThat(registration).hasFieldOrPropertyWithValue("dispatcherTypes",
+				EnumSet.of(DispatcherType.REQUEST, DispatcherType.ERROR));
 	}
 
 	private void registerAndRefreshContext(String... env) {

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafServletAutoConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -51,6 +51,7 @@ import org.springframework.mock.web.MockServletContext;
 import org.springframework.test.util.ReflectionTestUtils;
 import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
 import org.springframework.web.servlet.ViewResolver;
+import org.springframework.web.servlet.resource.ResourceUrlEncodingFilter;
 import org.springframework.web.servlet.support.RequestContext;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -217,7 +218,8 @@ public class ThymeleafServletAutoConfigurationTests {
 		load(BaseConfiguration.class, "spring.resources.chain.enabled:true");
 		FilterRegistrationBean<?> registration = this.context
 				.getBean(FilterRegistrationBean.class);
-		assertThat(registration).isNotNull();
+		assertThat(registration.getFilter())
+				.isInstanceOf(ResourceUrlEncodingFilter.class);
 		assertThat(registration).hasFieldOrPropertyWithValue("dispatcherTypes",
 				EnumSet.of(DispatcherType.REQUEST, DispatcherType.ERROR));
 	}