Detect custom ContentNegotiationViewResolver

The <mvc:annotation-driven> element now adds an alias when a
ContentNegotiationManager bean is registered with a custom name.
This helps <mvc:view-resolvers> to more reliably find such a custom
ContentNegotiationManager.

Issue: SPR-13559

spring-webmvc/src/main/java/org/springframework/web/servlet/config/AnnotationDrivenBeanDefinitionParser.java

 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -352,7 +352,11 @@ class AnnotationDrivenBeanDefinitionParser implements BeanDefinitionParser {
 	private RuntimeBeanReference getContentNegotiationManager(Element element, Object source, ParserContext parserContext) {
 		RuntimeBeanReference contentNegotiationManagerRef;
 		if (element.hasAttribute("content-negotiation-manager")) {
-			contentNegotiationManagerRef = new RuntimeBeanReference(element.getAttribute("content-negotiation-manager"));
+			String name = element.getAttribute("content-negotiation-manager");
+			contentNegotiationManagerRef = new RuntimeBeanReference(name);
+			if (!CONTENT_NEGOTIATION_MANAGER_BEAN_NAME.equals(name)) {
+				parserContext.getRegistry().registerAlias(name, CONTENT_NEGOTIATION_MANAGER_BEAN_NAME);
+			}
 		}
 		else {
 			RootBeanDefinition factoryBeanDef = new RootBeanDefinition(ContentNegotiationManagerFactoryBean.class);
@@ -360,10 +364,10 @@ class AnnotationDrivenBeanDefinitionParser implements BeanDefinitionParser {
 			factoryBeanDef.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
 			factoryBeanDef.getPropertyValues().add("mediaTypes", getDefaultMediaTypes());
 
-			String beanName = CONTENT_NEGOTIATION_MANAGER_BEAN_NAME;
-			parserContext.getReaderContext().getRegistry().registerBeanDefinition(beanName , factoryBeanDef);
-			parserContext.registerComponent(new BeanComponentDefinition(factoryBeanDef, beanName));
-			contentNegotiationManagerRef = new RuntimeBeanReference(beanName);
+			String name = CONTENT_NEGOTIATION_MANAGER_BEAN_NAME;
+			parserContext.getReaderContext().getRegistry().registerBeanDefinition(name , factoryBeanDef);
+			parserContext.registerComponent(new BeanComponentDefinition(factoryBeanDef, name));
+			contentNegotiationManagerRef = new RuntimeBeanReference(name);
 		}
 		return contentNegotiationManagerRef;
 	}

spring-webmvc/src/main/java/org/springframework/web/servlet/config/ViewResolversBeanDefinitionParser.java

@@ -185,9 +185,9 @@ public class ViewResolversBeanDefinitionParser implements BeanDefinitionParser {
 		if (resolverElement.hasAttribute("use-not-acceptable")) {
 			values.add("useNotAcceptableStatusCode", resolverElement.getAttribute("use-not-acceptable"));
 		}
-		String beanName = AnnotationDrivenBeanDefinitionParser.CONTENT_NEGOTIATION_MANAGER_BEAN_NAME;
-		if (context.getRegistry().containsBeanDefinition(beanName)) {
-			values.add("contentNegotiationManager", new RuntimeBeanReference(beanName));
+		String name = AnnotationDrivenBeanDefinitionParser.CONTENT_NEGOTIATION_MANAGER_BEAN_NAME;
+		if (context.getRegistry().containsBeanDefinition(name) || context.getRegistry().isAlias(name)) {
+			values.add("contentNegotiationManager", new RuntimeBeanReference(name));
 		}
 		return beanDef;
 	}

spring-webmvc/src/main/java/org/springframework/web/servlet/view/ContentNegotiatingViewResolver.java

@@ -124,6 +124,10 @@ public class ContentNegotiatingViewResolver extends WebApplicationObjectSupport
 		this.contentNegotiationManager = contentNegotiationManager;
 	}
 
+	public ContentNegotiationManager getContentNegotiationManager() {
+		return this.contentNegotiationManager;
+	}
+
 	/**
 	 * Indicate whether the extension of the request path should be used to determine the requested media type,
 	 * in favor of looking at the {@code Accept} header. The default value is {@code true}.

spring-webmvc/src/test/java/org/springframework/web/servlet/config/MvcNamespaceTests.java

@@ -680,7 +680,7 @@ public class MvcNamespaceTests {
 
 	@Test
 	public void testContentNegotiationManager() throws Exception {
-		loadBeanDefinitions("mvc-config-content-negotiation-manager.xml", 13);
+		loadBeanDefinitions("mvc-config-content-negotiation-manager.xml", 15);
 
 		RequestMappingHandlerMapping mapping = appContext.getBean(RequestMappingHandlerMapping.class);
 		ContentNegotiationManager manager = mapping.getContentNegotiationManager();
@@ -688,6 +688,15 @@ public class MvcNamespaceTests {
 		MockHttpServletRequest request = new MockHttpServletRequest("GET", "/foo.xml");
 		NativeWebRequest webRequest = new ServletWebRequest(request);
 		assertEquals(Arrays.asList(MediaType.valueOf("application/rss+xml")), manager.resolveMediaTypes(webRequest));
+
+		ViewResolverComposite compositeResolver = this.appContext.getBean(ViewResolverComposite.class);
+		assertNotNull(compositeResolver);
+		assertEquals("Actual: " + compositeResolver.getViewResolvers(), 1, compositeResolver.getViewResolvers().size());
+
+		ViewResolver resolver = compositeResolver.getViewResolvers().get(0);
+		assertEquals(ContentNegotiatingViewResolver.class, resolver.getClass());
+		ContentNegotiatingViewResolver cnvr = (ContentNegotiatingViewResolver) resolver;
+		assertSame(manager, cnvr.getContentNegotiationManager());
 	}
 
 	@Test

spring-webmvc/src/test/resources/org/springframework/web/servlet/config/mvc-config-content-negotiation-manager.xml

@@ -9,6 +9,10 @@
 
 	<mvc:annotation-driven content-negotiation-manager="contentNegotiationManager" />
 
+	<mvc:view-resolvers>
+		<mvc:content-negotiation/>
+	</mvc:view-resolvers>
+
 	<bean id="contentNegotiationManager" class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
 		<property name="mediaTypes">
 			<value>