Fix handling of empty payload Pong message on Jetty

Issue: SPR-12727

spring-websocket/src/main/java/org/springframework/web/socket/adapter/jetty/JettyWebSocketHandlerAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 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.
@@ -16,6 +16,8 @@
 
 package org.springframework.web.socket.adapter.jetty;
 
+import java.nio.ByteBuffer;
+
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.eclipse.jetty.websocket.api.Session;
@@ -36,6 +38,7 @@
 import org.springframework.web.socket.WebSocketHandler;
 import org.springframework.web.socket.handler.ExceptionWebSocketHandlerDecorator;
 
+
 /**
  * Adapts {@link WebSocketHandler} to the Jetty 9 WebSocket API.
  *
@@ -45,8 +48,11 @@
 @WebSocket
 public class JettyWebSocketHandlerAdapter {
 
+	private static final ByteBuffer EMPTY_PAYLOAD = ByteBuffer.wrap(new byte[0]);
+
 	private static final Log logger = LogFactory.getLog(JettyWebSocketHandlerAdapter.class);
 
+
 	private final WebSocketHandler webSocketHandler;
 
 	private final JettyWebSocketSession wsSession;
@@ -96,7 +102,8 @@ public void onWebSocketBinary(byte[] payload, int offset, int length) {
 	@OnWebSocketFrame
 	public void onWebSocketFrame(Frame frame) {
 		if (OpCode.PONG == frame.getOpCode()) {
-			PongMessage message = new PongMessage(frame.getPayload());
+			ByteBuffer payload = frame.getPayload() != null ? frame.getPayload() : EMPTY_PAYLOAD;
+			PongMessage message = new PongMessage(payload);
 			try {
 				this.webSocketHandler.handleMessage(this.wsSession, message);
 			}

spring-websocket/src/test/java/org/springframework/web/socket/WebSocketIntegrationTests.java

@@ -1,5 +1,5 @@
 /*
- * 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.
@@ -17,8 +17,14 @@
 package org.springframework.web.socket;
 
 
+import static org.junit.Assert.*;
+
 import java.net.URI;
+import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -32,10 +38,10 @@
 import org.springframework.web.socket.config.annotation.EnableWebSocket;
 import org.springframework.web.socket.config.annotation.WebSocketConfigurer;
 import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry;
+import org.springframework.web.socket.handler.AbstractWebSocketHandler;
 import org.springframework.web.socket.handler.TextWebSocketHandler;
 import org.springframework.web.socket.server.support.DefaultHandshakeHandler;
 
-import static org.junit.Assert.*;
 
 /**
  * Client and server-side WebSocket integration tests.
@@ -67,6 +73,24 @@ public void subProtocolNegotiation() throws Exception {
 		URI url = new URI(getWsBaseUrl() + "/ws");
 		WebSocketSession session = this.webSocketClient.doHandshake(new TextWebSocketHandler(), headers, url).get();
 		assertEquals("foo", session.getAcceptedProtocol());
+		session.close();
+	}
+
+	// SPR-12727
+
+	@Test
+	public void unsolicitedPongWithEmptyPayload() throws Exception {
+		TestWebSocketHandler serverHandler = this.wac.getBean(TestWebSocketHandler.class);
+		serverHandler.setWaitMessageCount(1);
+
+		String url = getWsBaseUrl() + "/ws";
+		WebSocketSession session = this.webSocketClient.doHandshake(new AbstractWebSocketHandler() {}, url).get();
+		session.sendMessage(new PongMessage());
+
+		serverHandler.await();
+		assertNull(serverHandler.getTransportError());
+		assertEquals(1, serverHandler.getReceivedMessages().size());
+		assertEquals(PongMessage.class, serverHandler.getReceivedMessages().get(0).getClass());
 	}
 
 
@@ -84,8 +108,51 @@ public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
 		}
 
 		@Bean
-		public TextWebSocketHandler handler() {
-			return new TextWebSocketHandler();
+		public TestWebSocketHandler handler() {
+			return new TestWebSocketHandler();
+		}
+
+	}
+
+	private static class TestWebSocketHandler extends AbstractWebSocketHandler {
+
+		private List<WebSocketMessage> receivedMessages = new ArrayList<>();
+
+		private int waitMessageCount;
+
+		private final CountDownLatch latch = new CountDownLatch(1);
+
+		private Throwable transportError;
+
+
+		public void setWaitMessageCount(int waitMessageCount) {
+			this.waitMessageCount = waitMessageCount;
+		}
+
+		public List<WebSocketMessage> getReceivedMessages() {
+			return this.receivedMessages;
+		}
+
+		public Throwable getTransportError() {
+			return this.transportError;
+		}
+
+		@Override
+		public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception {
+			this.receivedMessages.add(message);
+			if (this.receivedMessages.size() >= this.waitMessageCount) {
+				this.latch.countDown();
+			}
+		}
+
+		@Override
+		public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
+			this.transportError = exception;
+			this.latch.countDown();
+		}
+
+		public void await() throws InterruptedException {
+			this.latch.await(5, TimeUnit.SECONDS);
 		}
 	}