Hi, new to websocket. I do not know why I get this exception.
java.lang.IllegalStateException: A SockJsMessageCodec is required but not available: Add Jackson 2 to the classpath, or configure a custom SockJsMessageCodec. at org.springframework.util.Assert.state(Assert.java:385) at org.springframework.web.socket.sockjs.transport.TransportHandlingSockJsService.getMessageCodec(TransportHandlingSockJsService.java:130) at org.springframework.web.socket.sockjs.transport.session.WebSocketServerSockJsSession.handleMessage(WebSocketServerSockJsSession.java:187) at org.springframework.web.socket.sockjs.transport.handler.SockJsWebSocketHandler.handleTextMessage(SockJsWebSocketHandler.java:92) at org.springframework.web.socket.handler.AbstractWebSocketHandler.handleMessage(AbstractWebSocketHandler.java:43) at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter.handleTextMessage(StandardWebSocketHandlerAdapter.java:112) at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter.access$000(StandardWebSocketHandlerAdapter.java:42) at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter$3.onMessage(StandardWebSocketHandlerAdapter.java:82) at org.springframework.web.socket.adapter.standard.StandardWebSocketHandlerAdapter$3.onMessage(StandardWebSocketHandlerAdapter.java:79) at org.apache.tomcat.websocket.WsFrameBase.sendMessageText(WsFrameBase.java:369) at org.apache.tomcat.websocket.WsFrameBase.processDataText(WsFrameBase.java:468) at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:272) at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:116) at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:54) at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onDataAvailable(WsHttpUpgradeHandler.java:192) at org.apache.coyote.http11.upgrade.AbstractServletInputStream.onDataAvailable(AbstractServletInputStream.java:178) at org.apache.coyote.http11.upgrade.AbstractProcessor.upgradeDispatch(AbstractProcessor.java:92) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:601) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)
Console output
Opening Web Socket... stomp.js:145 Web Socket Opened... stomp.js:145 >>> CONNECT accept-version:1.1,1.0 heart-beat:10000,10000 stomp.js:145 Whoops! Lost connection to undefined
This is my bjplayer-servlet.xml
<mvc:annotation-driven/> <context:annotation-config/> <context:component-scan base-package="com.package.bjplayer"/> <bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> <property name="prefix" value="/WEB-INF/view"/> <property name="suffix" value=".jsp"/> </bean> <websocket:message-broker application-destination-prefix="/app"> <websocket:stomp-endpoint path="/ws"> <websocket:sockjs/> </websocket:stomp-endpoint> <websocket:simple-broker prefix="/topic"/> </websocket:message-broker>
For my controller
@MessageMapping("/joinRoom") @SendTo("/topic/lobby") public List<Room> webSocketJoinRoom(Room room){ System.out.println("your RoomName is: "+room.getRoomName()); return roomService.getRooms(); }
My javascript
<script type="text/javascript"> var contextPath = "${pageContext.request.contextPath}"; var socket = new SockJS(contextPath+"/ws"); var stompClient = Stomp.over(socket); var connectCallback = function() { stompClient.subscribe('/topic/lobby', renderLobby); }; var errorCallback = function(error) { alert("Opps Mali ka Blehh"); }; stompClient.connect({}, connectCallback, errorCallback); function renderLobby(response) { var rooms = JSON.parse(response.body); $('#lobby').empty();
My Jsp.
Room Name: <input type="text" class="roomName" value="${room.roomName}"/> <button class="joinRoom">Try it</button>
My jar files.
spring-beans-4.1.0.RELEASE.jar spring-context-4.1.0.RELEASE.jar spring-context-support-4.1.0.RELEASE.jar spring-core-4.1.0.RELEASE.jar spring-expression-4.1.0.RELEASE.jar spring-jdbc-4.1.0.RELEASE.jar spring-jms-4.1.0.RELEASE.jar spring-messaging-4.1.0.RELEASE.jar spring-orm-4.1.0.RELEASE.jar spring-tx-4.1.0.RELEASE.jar spring-web-4.1.0.RELEASE.jar spring-webmvc-4.1.0.RELEASE.jar spring-websocket-4.1.0.RELEASE.jar jackson-databind-2.3.4.jar
Am I missing something? an exception indicates that SockJsMessageCodec is not available.
please help me thnx in advance.
By the way, this is a demo that I followed. https://gerrydevstory.com/2014/03/04/stock-ticker-demo-webapp-using-spring-4-websocket/