Apply changes recommended by Jetty team to JettyEmbeddedErrorHandler

Closes gh-18842

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

@@ -18,20 +18,15 @@ package org.springframework.boot.web.embedded.jetty;
 
 import java.io.IOException;
 
-import javax.servlet.ServletContext;
 import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletRequestWrapper;
 import javax.servlet.http.HttpServletResponse;
 
 import org.eclipse.jetty.http.HttpMethod;
 import org.eclipse.jetty.server.Request;
-import org.eclipse.jetty.server.handler.ErrorHandler;
+import org.eclipse.jetty.servlet.ErrorPageErrorHandler;
-import org.eclipse.jetty.server.handler.ErrorHandler.ErrorPageMapper;
-
-import org.springframework.util.ReflectionUtils;
 
 /**
- * Variation of Jetty's {@link ErrorHandler} that supports all {@link HttpMethod
+ * Variation of Jetty's {@link ErrorPageErrorHandler} that supports all {@link HttpMethod
  * HttpMethods} rather than just {@code GET}, {@code POST} and {@code HEAD}. By default
  * Jetty <a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=446039">intentionally only
  * supports a limited set of HTTP methods</a> for error pages, however, Spring Boot
@@ -40,65 +35,18 @@ import org.springframework.util.ReflectionUtils;
  * @author Phillip Webb
  * @author Christoph Dreis
  */
-class JettyEmbeddedErrorHandler extends ErrorHandler implements ErrorPageMapper {
+class JettyEmbeddedErrorHandler extends ErrorPageErrorHandler {
 
-	static final boolean ERROR_PAGE_FOR_METHOD_AVAILABLE;
+	@Override
-
+	public boolean errorPageForMethod(String method) {
-	static {
+		return true;
-		ERROR_PAGE_FOR_METHOD_AVAILABLE = ReflectionUtils.findMethod(ErrorHandler.class, "errorPageForMethod",
-				String.class) != null;
-	}
-
-	private final ErrorHandler delegate;
-
-	JettyEmbeddedErrorHandler(ErrorHandler delegate) {
-		this.delegate = delegate;
 	}
 
 	@Override
 	public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
 			throws IOException {
-		if (!ERROR_PAGE_FOR_METHOD_AVAILABLE) {
+		baseRequest.setMethod("GET");
-			String method = request.getMethod();
+		super.doError(target, baseRequest, request, response);
-			if (!HttpMethod.GET.is(method) && !HttpMethod.POST.is(method) && !HttpMethod.HEAD.is(method)) {
-				request = new ErrorHttpServletRequest(request);
-			}
-		}
-		this.delegate.handle(target, baseRequest, request, response);
-	}
-
-	@Override
-	public boolean errorPageForMethod(String method) { // Available in Jetty 9.4.21+
-		return true;
-	}
-
-	@Override
-	public String getErrorPage(HttpServletRequest request) {
-		if (this.delegate instanceof ErrorPageMapper) {
-			return ((ErrorPageMapper) this.delegate).getErrorPage(request);
-		}
-		return null;
-	}
-
-	private static class ErrorHttpServletRequest extends HttpServletRequestWrapper {
-
-		private boolean simulateGetMethod = true;
-
-		ErrorHttpServletRequest(HttpServletRequest request) {
-			super(request);
-		}
-
-		@Override
-		public String getMethod() {
-			return (this.simulateGetMethod ? HttpMethod.GET.toString() : super.getMethod());
-		}
-
-		@Override
-		public ServletContext getServletContext() {
-			this.simulateGetMethod = false;
-			return super.getServletContext();
-		}
-
 	}
 
 }

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/jetty/JettyServletWebServerFactory.java

@@ -339,8 +339,8 @@ public class JettyServletWebServerFactory extends AbstractServletWebServerFactor
 
 			@Override
 			public void configure(WebAppContext context) throws Exception {
-				ErrorHandler errorHandler = context.getErrorHandler();
+				JettyEmbeddedErrorHandler errorHandler = new JettyEmbeddedErrorHandler();
-				context.setErrorHandler(new JettyEmbeddedErrorHandler(errorHandler));
+				context.setErrorHandler(errorHandler);
 				addJettyErrorPages(errorHandler, getErrorPages());
 			}
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/embedded/jetty/JettyServlet9419WebServerFactoryTests.java

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.web.embedded.jetty;
 
+import org.eclipse.jetty.server.handler.ErrorHandler;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -39,7 +40,7 @@ public class JettyServlet9419WebServerFactoryTests extends AbstractJettyServletW
 
 	@Test
 	public void correctVersionOfJettyUsed() {
-		assertThat(JettyEmbeddedErrorHandler.ERROR_PAGE_FOR_METHOD_AVAILABLE).isFalse();
+		assertThat(ErrorHandler.class.getPackage().getImplementationVersion()).isEqualTo("9.4.19.v20190610");
 	}
 
 }

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/embedded/jetty/JettyServletWebServerFactoryTests.java

@@ -20,6 +20,8 @@ import java.net.InetAddress;
 import java.time.Duration;
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 import javax.servlet.ServletContextEvent;
 import javax.servlet.ServletContextListener;
@@ -29,6 +31,7 @@ import org.eclipse.jetty.server.Handler;
 import org.eclipse.jetty.server.Server;
 import org.eclipse.jetty.server.ServerConnector;
 import org.eclipse.jetty.server.SslConnectionFactory;
+import org.eclipse.jetty.server.handler.ErrorHandler;
 import org.eclipse.jetty.server.handler.HandlerCollection;
 import org.eclipse.jetty.server.handler.HandlerWrapper;
 import org.eclipse.jetty.util.thread.QueuedThreadPool;
@@ -59,7 +62,10 @@ public class JettyServletWebServerFactoryTests extends AbstractJettyServletWebSe
 
 	@Test
 	public void correctVersionOfJettyUsed() {
-		assertThat(JettyEmbeddedErrorHandler.ERROR_PAGE_FOR_METHOD_AVAILABLE).isTrue();
+		String jettyVersion = ErrorHandler.class.getPackage().getImplementationVersion();
+		Matcher matcher = Pattern.compile("[0-9]+.[0-9]+.([0-9]+)[\\.-].*").matcher(jettyVersion);
+		assertThat(matcher.find()).isTrue();
+		assertThat(Integer.valueOf(matcher.group(1))).isGreaterThan(19);
 	}
 
 	@Test