Re: [jetty-users] NPE in WebSocketServlet

[Greg Wilkins <gregw@xxxxxxxxxxx>]

Arnold,

does the demo work for you?

Have you altered the demo in any way?

regards




Benedikt Arnold wrote:
> Hi,
> my name is Ben and I'm new to jetty users list.
> 
> I want to try out websockets whith jetty 7.0.1 but I got a NullPointerException in WebSocketServlet#service() on line 58 because the http object is null. See stacktrace below.
> 
> My own implementation of WebSocketServlet is very simple:
> 
> public class CountWebSocketServlet extends WebSocketServlet {
> 
> 	protected void doGet(HttpServletRequest request,
> 			HttpServletResponse response) throws ServletException, IOException {
> 		getServletContext().getNamedDispatcher("default").forward(request,
> 				response);
> 	}
> 
> 	protected WebSocket doWebSocketConnect(HttpServletRequest arg0, String arg1) {
> 		return new CountWebSocket();
> 	}
> }
> 
> Can anyone give me a hint or is this still a bug?
> 
> Thanks a lot,
> Ben
> 
> 
> java.lang.NullPointerException
> 	at org.eclipse.jetty.websocket.WebSocketServlet.service(WebSocketServlet.java:58)
> 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
> 	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:530)
> 	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:427)
> 	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
> 	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:457)
> 	at org.eclipse.jetty.server.session.SessionHandler.handle(SessionHandler.java:182)
> 	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:933)
> 	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:362)
> 	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:867)
> 	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
> 	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:245)
> 	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)
> 	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113)
> 	at org.eclipse.jetty.server.Server.handle(Server.java:334)
> 	at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:559)
> 	at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:992)
> 	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:541)
> 	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:203)
> 	at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:406)
> 	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:462)
> 	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436)
> 	at java.lang.Thread.run(Thread.java:619)