Rework JettyEmbeddedErrorHandler to support Jetty 8

Closes gh-10175

spring-boot/src/main/java/org/springframework/boot/context/embedded/jetty/JettyEmbeddedErrorHandler.java

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 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.
@@ -17,6 +17,9 @@
 package org.springframework.boot.context.embedded.jetty;
 
 import java.io.IOException;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
 
 import javax.servlet.ServletContext;
 import javax.servlet.http.HttpServletRequest;
@@ -35,9 +38,20 @@ import org.eclipse.jetty.server.handler.ErrorHandler;
  * prefers Tomcat, Jetty and Undertow to all behave in the same way.
  *
  * @author Phillip Webb
+ * @author Andy Wilkinson
  */
 class JettyEmbeddedErrorHandler extends ErrorHandler {
 
+	private static final Set<String> SUPPORTED_METHODS;
+
+	static {
+		Set<String> supportedMethods = new HashSet<String>();
+		supportedMethods.add("GET");
+		supportedMethods.add("HEAD");
+		supportedMethods.add("POST");
+		SUPPORTED_METHODS = Collections.unmodifiableSet(supportedMethods);
+	}
+
 	private final ErrorHandler delegate;
 
 	JettyEmbeddedErrorHandler(ErrorHandler delegate) {
@@ -47,14 +61,21 @@ class JettyEmbeddedErrorHandler extends ErrorHandler {
 	@Override
 	public void handle(String target, Request baseRequest, HttpServletRequest request,
 			HttpServletResponse response) throws IOException {
-		String method = request.getMethod();
-		if (!HttpMethod.GET.is(method) && !HttpMethod.POST.is(method)
-				&& !HttpMethod.HEAD.is(method)) {
+		if (!isSupported(request.getMethod())) {
 			request = new ErrorHttpServletRequest(request);
 		}
 		this.delegate.handle(target, baseRequest, request, response);
 	}
 
+	private boolean isSupported(String method) {
+		for (String supportedMethod : SUPPORTED_METHODS) {
+			if (supportedMethod.equalsIgnoreCase(method)) {
+				return true;
+			}
+		}
+		return false;
+	}
+
 	private static class ErrorHttpServletRequest extends HttpServletRequestWrapper {
 
 		private boolean simulateGetMethod = true;

spring-boot/src/test/java/org/springframework/boot/context/embedded/jetty/Jetty8JettyEmbeddedServletContainerFactoryTests.java

+/*
+ * Copyright 2012-2017 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.context.embedded.jetty;
+
+import java.io.IOException;
+
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.boot.context.embedded.EmbeddedServletContainer;
+import org.springframework.boot.junit.runner.classpath.ClassPathExclusions;
+import org.springframework.boot.junit.runner.classpath.ClassPathOverrides;
+import org.springframework.boot.junit.runner.classpath.ModifiedClassPathRunner;
+import org.springframework.boot.web.servlet.ErrorPage;
+import org.springframework.boot.web.servlet.ServletContextInitializer;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.client.ClientHttpResponse;
+import org.springframework.web.client.ResponseErrorHandler;
+import org.springframework.web.client.RestTemplate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link JettyEmbeddedServletContainerFactory} with Jetty 8.
+ *
+ * @author Andy Wilkinson
+ */
+@RunWith(ModifiedClassPathRunner.class)
+@ClassPathExclusions({ "jetty-*.jar", "tomcat-embed-jasper-*.jar" })
+@ClassPathOverrides({ "org.eclipse.jetty:jetty-servlets:8.1.15.v20140411",
+		"org.eclipse.jetty:jetty-webapp:8.1.15.v20140411" })
+public class Jetty8JettyEmbeddedServletContainerFactoryTests {
+
+	@Test
+	public void errorHandling() {
+		JettyEmbeddedServletContainerFactory factory = new JettyEmbeddedServletContainerFactory(
+				0);
+		factory.addErrorPages(new ErrorPage("/error"));
+		EmbeddedServletContainer jetty = factory
+				.getEmbeddedServletContainer(new ServletContextInitializer() {
+
+					@Override
+					public void onStartup(ServletContext servletContext)
+							throws ServletException {
+						servletContext.addServlet("test", new TestServlet())
+								.addMapping("/test");
+						servletContext.addServlet("error", new ErrorPageServlet())
+								.addMapping("/error");
+					}
+
+				});
+		jetty.start();
+		int port = jetty.getPort();
+		RestTemplate restTemplate = new RestTemplate();
+		restTemplate.setErrorHandler(new ResponseErrorHandler() {
+
+			@Override
+			public boolean hasError(ClientHttpResponse response) throws IOException {
+				return false;
+			}
+
+			@Override
+			public void handleError(ClientHttpResponse response) throws IOException {
+			}
+
+		});
+		ResponseEntity<String> response = restTemplate
+				.getForEntity("http://localhost:" + port, String.class);
+		assertThat(response.getBody()).isEqualTo("An error occurred");
+	}
+
+	private static final class TestServlet extends HttpServlet {
+
+		@Override
+		protected void doGet(HttpServletRequest req, HttpServletResponse resp)
+				throws ServletException, IOException {
+			throw new RuntimeException("boom");
+		}
+
+	}
+
+	private static final class ErrorPageServlet extends HttpServlet {
+
+		@Override
+		protected void doGet(HttpServletRequest req, HttpServletResponse resp)
+				throws IOException {
+			resp.getWriter().print("An error occurred");
+			resp.flushBuffer();
+		}
+	}
+
+}