Polish SPR-12286

Issue: SPR-12286

spring-web/src/main/java/org/springframework/web/accept/ContentNegotiationManagerFactoryBean.java

@@ -61,8 +61,6 @@ public class ContentNegotiationManagerFactoryBean
 
 	private String parameterName = "format";
 
-	private MediaType defaultContentType;
-
 	private ContentNegotiationStrategy defaultNegotiationStrategy;
 
 	private ContentNegotiationManager contentNegotiationManager;
@@ -186,7 +184,7 @@ public class ContentNegotiationManagerFactoryBean
 	 * determine the requested content type.
 	 */
 	public void setDefaultContentType(MediaType defaultContentType) {
-		this.defaultContentType = defaultContentType;
+		this.defaultNegotiationStrategy = new FixedContentNegotiationStrategy(defaultContentType);
 	}
 
 	/**
@@ -196,7 +194,7 @@ public class ContentNegotiationManagerFactoryBean
 	 * the requested content type.
 	 * @since 4.1.2
 	 */
-	public void setDefaultContentType(ContentNegotiationStrategy defaultStrategy) {
+	public void setDefaultContentTypeStrategy(ContentNegotiationStrategy defaultStrategy) {
 		this.defaultNegotiationStrategy = defaultStrategy;
 	}
 
@@ -235,10 +233,6 @@ public class ContentNegotiationManagerFactoryBean
 			strategies.add(new HeaderContentNegotiationStrategy());
 		}
 
-		if (this.defaultContentType != null) {
-			strategies.add(new FixedContentNegotiationStrategy(this.defaultContentType));
-		}
-
 		if(this.defaultNegotiationStrategy != null) {
 			strategies.add(defaultNegotiationStrategy);
 		}

spring-web/src/test/java/org/springframework/web/accept/ContentNegotiationManagerFactoryBeanTests.java

@@ -171,7 +171,7 @@ public class ContentNegotiationManagerFactoryBeanTests {
 	// SPR-12286
 	@Test
 	public void setDefaultContentTypeWithStrategy() throws Exception {
-		this.factoryBean.setDefaultContentType(new FixedContentNegotiationStrategy(MediaType.APPLICATION_JSON));
+		this.factoryBean.setDefaultContentTypeStrategy(new FixedContentNegotiationStrategy(MediaType.APPLICATION_JSON));
 		this.factoryBean.afterPropertiesSet();
 		ContentNegotiationManager manager = this.factoryBean.getObject();
 

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

@@ -162,6 +162,9 @@ public class ContentNegotiationConfigurer {
 	 * <p>This content type will be used when neither the request path extension,
 	 * nor a request parameter, nor the {@code Accept} header could help determine
 	 * the requested content type.
+	 * <p>Note that this method achieves the same goal as {@code defaultContentTypeStrategy}, so both
+	 * shouldn't be used at the same time.
+	 * @see #defaultContentTypeStrategy(org.springframework.web.accept.ContentNegotiationStrategy)
 	 */
 	public ContentNegotiationConfigurer defaultContentType(MediaType defaultContentType) {
 		this.factoryBean.setDefaultContentType(defaultContentType);
@@ -173,10 +176,13 @@ public class ContentNegotiationConfigurer {
 	 * <p>This content type will be used when neither the request path extension,
 	 * nor a request parameter, nor the {@code Accept} header could help determine
 	 * the requested content type.
+	 * <p>Note that this method achieves the same goal as {@code defaultContentType}, so both
+	 * shouldn't be used at the same time.
 	 * @since 4.1.2
+	 * @see #defaultContentType(org.springframework.http.MediaType)
 	 */
-	public ContentNegotiationConfigurer defaultContentType(ContentNegotiationStrategy defaultStrategy) {
-		this.factoryBean.setDefaultContentType(defaultStrategy);
+	public ContentNegotiationConfigurer defaultContentTypeStrategy(ContentNegotiationStrategy defaultStrategy) {
+		this.factoryBean.setDefaultContentTypeStrategy(defaultStrategy);
 		return this;
 	}
 

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

@@ -113,8 +113,8 @@ public class ContentNegotiationConfigurerTests {
 	}
 
 	@Test
-	public void setDefaultContentTypeWithStrategy() throws Exception {
-		this.configurer.defaultContentType(new FixedContentNegotiationStrategy(MediaType.APPLICATION_JSON));
+	public void setDefaultContentTypeStrategy() throws Exception {
+		this.configurer.defaultContentTypeStrategy(new FixedContentNegotiationStrategy(MediaType.APPLICATION_JSON));
 		ContentNegotiationManager manager = this.configurer.getContentNegotiationManager();
 
 		assertEquals(Arrays.asList(MediaType.APPLICATION_JSON), manager.resolveMediaTypes(this.webRequest));