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POJetty 8.1.9.v20130131 Web Socket issues
 

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  1. POJetty 8.1.9.v20130131 Web Socket issues
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    <p>I do have a strange problem with jetty 8 websockets. I found several tutorials that pretty much show the same code, yet I get this error when I try to open the websocket from a local html page:</p> <pre><code>2013-02-05 13:14:03.467:INFO:oejs.Server:jetty-8.1.9.v20130131 2013-02-05 13:14:03.770:INFO:oejs.AbstractConnector:Started SelectChannelConnector@0.0.0.0:8080 2013-02-05 13:14:18.002:WARN:oejs.ServletHandler:/echo java.lang.NullPointerException at org.eclipse.jetty.websocket.WebSocketFactory.upgrade(WebSocketFactory.java:236) at org.eclipse.jetty.websocket.WebSocketFactory.acceptWebSocket(WebSocketFactory.java:382) at org.eclipse.jetty.websocket.WebSocketServlet.service(WebSocketServlet.java:104) at javax.servlet.http.HttpServlet.service(HttpServlet.java:848) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:669) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:457) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137) </code></pre> <p>Here is the Socket servlet:</p> <pre class="lang-java prettyprint-override"><code>public class ExampleWebSocketServlet extends WebSocketServlet { private static final long serialVersionUID = 1L; /** * @see WebSocketServlet#WebSocketServlet() */ public ExampleWebSocketServlet() { super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter out = response.getWriter(); out.println("OK"); out.close(); System.out.println("OK"); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { getServletContext().getNamedDispatcher("default").forward(request, response); } public WebSocket doWebSocketConnect(HttpServletRequest request, String protocol) { return new EchoWebSocket(); } } </code></pre> <p>and the WebSocket (for a simple Echo)</p> <pre class="lang-java prettyprint-override"><code>public class EchoWebSocket implements WebSocket.OnTextMessage { private Connection con; @Override public void onClose(int closeCode, String message) { } @Override public void onOpen(Connection con) { this.con = con; try { con.sendMessage("Server received Web Socket upgrade ..."); } catch (IOException e) { e.printStackTrace(); } } @Override public void onMessage(String msg) { System.out.println("Received: "+msg); try { con.sendMessage(msg); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } //send it back } } </code></pre> <p>My html page works fine with other websocket test servers, e.g. websocket.org</p> <p>What could be wrong? I am on Eclipse, created a dynamic web project and use the jetty webapp run configuration. Also, when jetty starts up i can see that </p> <p>/Users/sven.haiges/dev/jetty/jetty-distribution-8.1.9.v20130131/lib/jetty-websocket-8.1.9.v20130131.jar</p> <p>is on the classpath. </p> <p>Any help appreciated,thx!</p>
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    1. CODoes the test webapp in the distribution work for you on the same server machine + web browser combo?
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    2. COStart the distribution `java -jar start.jar` and goto `http://localhost:8080/ws/` and see what happens
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