Spring MVC supports ResponseStatusException

The ResponseStatusException is now also supported in Spring MVC
through the ResponseStatusExceptionResolver.

Issue: SPR-14895

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/annotation/ResponseStatusExceptionResolver.java

 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -16,6 +16,7 @@
 
 package org.springframework.web.servlet.mvc.annotation;
 
+import java.io.IOException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
@@ -25,6 +26,7 @@ import org.springframework.context.i18n.LocaleContextHolder;
 import org.springframework.core.annotation.AnnotatedElementUtils;
 import org.springframework.util.StringUtils;
 import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.server.ResponseStatusException;
 import org.springframework.web.servlet.ModelAndView;
 import org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver;
 
@@ -41,6 +43,8 @@ import org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver;
  * present on cause exceptions, and as of 4.2.2 this resolver supports
  * attribute overrides for {@code @ResponseStatus} in custom composed annotations.
  *
+ * <p>As of 5.0 this resolver also supports {@link ResponseStatusException}.
+ *
  * @author Arjen Poutsma
  * @author Rossen Stoyanchev
  * @author Sam Brannen
@@ -62,43 +66,80 @@ public class ResponseStatusExceptionResolver extends AbstractHandlerExceptionRes
 	protected ModelAndView doResolveException(HttpServletRequest request, HttpServletResponse response,
 			Object handler, Exception ex) {
 
-		ResponseStatus responseStatus = AnnotatedElementUtils.findMergedAnnotation(ex.getClass(), ResponseStatus.class);
-		if (responseStatus != null) {
-			try {
-				return resolveResponseStatus(responseStatus, request, response, handler, ex);
+		try {
+			if (ex instanceof ResponseStatusException) {
+				return resolveResponseStatusException((ResponseStatusException) ex, request, response, handler);
+			}
+
+			ResponseStatus status = AnnotatedElementUtils.findMergedAnnotation(ex.getClass(), ResponseStatus.class);
+			if (status != null) {
+				return resolveResponseStatus(status, request, response, handler, ex);
 			}
-			catch (Exception resolveEx) {
-				logger.warn("Handling of @ResponseStatus resulted in Exception", resolveEx);
+
+			if (ex.getCause() instanceof Exception) {
+				ex = (Exception) ex.getCause();
+				return doResolveException(request, response, handler, ex);
 			}
 		}
-		else if (ex.getCause() instanceof Exception) {
-			ex = (Exception) ex.getCause();
-			return doResolveException(request, response, handler, ex);
+		catch (Exception resolveEx) {
+			logger.warn("Handling of @ResponseStatus resulted in Exception", resolveEx);
 		}
 		return null;
 	}
 
 	/**
-	 * Template method that handles {@link ResponseStatus @ResponseStatus} annotation.
-	 * <p>The default implementation sends a response error using
-	 * {@link HttpServletResponse#sendError(int)} or
-	 * {@link HttpServletResponse#sendError(int, String)} if the annotation has a
-	 * {@linkplain ResponseStatus#reason() reason} and then returns an empty ModelAndView.
-	 * @param responseStatus the annotation
+	 * Template method that handles the {@link ResponseStatus @ResponseStatus} annotation.
+	 * <p>The default implementation delegates to {@link #applyStatusAndReason}
+	 * with the status code and reason from the annotation.
+	 * @param responseStatus the {@code @ResponseStatus} annotation
 	 * @param request current HTTP request
 	 * @param response current HTTP response
 	 * @param handler the executed handler, or {@code null} if none chosen at the
-	 * time of the exception (for example, if multipart resolution failed)
-	 * @param ex the exception that got thrown during handler execution or the
-	 * exception that has the ResponseStatus annotation if found on the cause.
-	 * @return a corresponding ModelAndView to forward to, or {@code null}
-	 * for default processing
+	 * time of the exception, e.g. if multipart resolution failed
+	 * @param ex the exception
+	 * @return an empty ModelAndView, i.e. exception resolved
 	 */
-	protected ModelAndView resolveResponseStatus(ResponseStatus responseStatus, HttpServletRequest request,
-			HttpServletResponse response, Object handler, Exception ex) throws Exception {
+	protected ModelAndView resolveResponseStatus(ResponseStatus responseStatus,
+			HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
+			throws Exception {
 
 		int statusCode = responseStatus.code().value();
 		String reason = responseStatus.reason();
+		return applyStatusAndReason(statusCode, reason, response);
+	}
+
+	/**
+	 * Template method that handles an {@link ResponseStatusException}.
+	 * <p>The default implementation delegates to {@link #applyStatusAndReason}
+	 * with the status code and reason from the exception.
+	 * @param ex the exception
+	 * @param request current HTTP request
+	 * @param response current HTTP response
+	 * @param handler the executed handler, or {@code null} if none chosen at the
+	 * time of the exception, e.g. if multipart resolution failed
+	 * @return an empty ModelAndView, i.e. exception resolved
+	 * @since 5.0
+	 */
+	protected ModelAndView resolveResponseStatusException(ResponseStatusException ex,
+			HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
+
+		int statusCode = ex.getStatus().value();
+		String reason = ex.getReason();
+		applyStatusAndReason(statusCode, reason, response);
+		return new ModelAndView();
+	}
+
+	/**
+	 * Apply the resolved status code and reason to the response.
+	 * <p>The default implementation sends a response error using
+	 * {@link HttpServletResponse#sendError(int)} or
+	 * {@link HttpServletResponse#sendError(int, String)} if there is a reason
+	 * and then returns an empty ModelAndView.
+	 * @since 5.0
+	 */
+	protected ModelAndView applyStatusAndReason(int statusCode, String reason, HttpServletResponse response)
+			throws IOException {
+
 		if (this.messageSource != null) {
 			reason = this.messageSource.getMessage(reason, null, reason, LocaleContextHolder.getLocale());
 		}

spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/annotation/ResponseStatusExceptionResolverTests.java

@@ -32,6 +32,7 @@ import org.springframework.mock.web.test.MockHttpServletRequest;
 import org.springframework.mock.web.test.MockHttpServletResponse;
 import org.springframework.tests.sample.beans.ITestBean;
 import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.server.ResponseStatusException;
 import org.springframework.web.servlet.ModelAndView;
 
 import static org.junit.Assert.*;
@@ -41,6 +42,7 @@ import static org.junit.Assert.*;
  *
  * @author Arjen Poutsma
  * @author Sam Brannen
+ * @author Rossen Stoyanchev
  */
 public class ResponseStatusExceptionResolverTests {
 
@@ -50,40 +52,32 @@ public class ResponseStatusExceptionResolverTests {
 
 	private final MockHttpServletResponse response = new MockHttpServletResponse();
 
+
 	@Before
 	public void setup() {
 		exceptionResolver.setWarnLogCategory(exceptionResolver.getClass().getName());
 	}
 
+
 	@Test
 	public void statusCode() {
 		StatusCodeException ex = new StatusCodeException();
 		ModelAndView mav = exceptionResolver.resolveException(request, response, null, ex);
-		assertNotNull("No ModelAndView returned", mav);
-		assertTrue("No Empty ModelAndView returned", mav.isEmpty());
-		assertEquals("Invalid status code", 400, response.getStatus());
-		assertTrue("Response has not been committed", response.isCommitted());
+		assertResolved(mav, 400, null);
 	}
 
 	@Test
 	public void statusCodeFromComposedResponseStatus() {
 		StatusCodeFromComposedResponseStatusException ex = new StatusCodeFromComposedResponseStatusException();
 		ModelAndView mav = exceptionResolver.resolveException(request, response, null, ex);
-		assertNotNull("No ModelAndView returned", mav);
-		assertTrue("No Empty ModelAndView returned", mav.isEmpty());
-		assertEquals("Invalid status code", 400, response.getStatus());
-		assertTrue("Response has not been committed", response.isCommitted());
+		assertResolved(mav, 400, null);
 	}
 
 	@Test
 	public void statusCodeAndReason() {
 		StatusCodeAndReasonException ex = new StatusCodeAndReasonException();
 		ModelAndView mav = exceptionResolver.resolveException(request, response, null, ex);
-		assertNotNull("No ModelAndView returned", mav);
-		assertTrue("No Empty ModelAndView returned", mav.isEmpty());
-		assertEquals("Invalid status code", 410, response.getStatus());
-		assertEquals("Invalid status reason", "You suck!", response.getErrorMessage());
-		assertTrue("Response has not been committed", response.isCommitted());
+		assertResolved(mav, 410, "You suck!");
 	}
 
 	@Test
@@ -112,16 +106,29 @@ public class ResponseStatusExceptionResolverTests {
 		assertNull("ModelAndView returned", mav);
 	}
 
-	// SPR-12903
-
-	@Test
+	@Test // SPR-12903
 	public void nestedException() throws Exception {
 		Exception cause = new StatusCodeAndReasonMessageException();
 		TypeMismatchException ex = new TypeMismatchException("value", ITestBean.class, cause);
 		ModelAndView mav = exceptionResolver.resolveException(request, response, null, ex);
-		assertNotNull("No ModelAndView returned", mav);
-		assertTrue("No Empty ModelAndView returned", mav.isEmpty());
-		assertEquals("Invalid status code", 410, response.getStatus());
+		assertResolved(mav, 410, null);
+	}
+
+	@Test
+	public void responseStatusException() throws Exception {
+		ResponseStatusException ex = new ResponseStatusException(HttpStatus.BAD_REQUEST, "The reason");
+		ModelAndView mav = exceptionResolver.resolveException(request, response, null, ex);
+		assertResolved(mav, 400, null);
+	}
+
+
+	private void assertResolved(ModelAndView mav, int status, String reason) {
+		assertTrue("No Empty ModelAndView returned", mav != null && mav.isEmpty());
+		assertEquals(status, response.getStatus());
+		if (reason != null) {
+			assertEquals(reason, response.getErrorMessage());
+		}
+		assertTrue(response.isCommitted());
 	}
 
 
@@ -142,6 +149,7 @@ public class ResponseStatusExceptionResolverTests {
 
 	@ResponseStatus
 	@Retention(RetentionPolicy.RUNTIME)
+	@SuppressWarnings("unused")
 	@interface ComposedResponseStatus {
 
 		@AliasFor(annotation = ResponseStatus.class, attribute = "code")