CODEWITHSUNDEEP
javawebsocketjetty
viq
viq

Reputation: 417

Jetty WebSocketServlet NPE

I try to use jetty web socket and have some troubles, may be you know how to fix them.

There is SocketServlet (from example):

public class SocketServlet extends WebSocketServlet {

  @Override
  public void configure(WebSocketServletFactory factory) {
      factory.register(MyEchoSocket.class);
  }
}

And EchoSocket

@WebSocket
public class MyEchoSocket {

   @OnWebSocketConnect
   public void onConnect(Session session){
       System.out.println("Connect");
   }
}

web.xml (part)

<servlet>
    <servlet-name>SocketServlet</servlet-name>
    <servlet-class>ru.servlets.SocketServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>SocketServlet</servlet-name>
    <url-pattern>/hello/*</url-pattern>
</servlet-mapping>

And when i build and run it with maven i have NPE:

2013-07-18 23:20:29.488:WARN:oejs.ServletHandler:/hello java.lang.NullPointerException at org.eclipse.jetty.websocket.server.WebSocketServerFactory.upgrade(WebSocketServerFactory.java:415) at org.eclipse.jetty.websocket.server.WebSocketServerFactory.acceptWebSocket(WebSocketServerFactory.java:178) at org.eclipse.jetty.websocket.servlet.WebSocketServlet.service(WebSocketServlet.java:160) 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) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) at org.eclipse.jetty.server.Server.handle(Server.java:368) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489) at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:942) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1004) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:640) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:628) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543) at java.lang.Thread.run(Thread.java:724)

I use jetty version 9.0.4.v20130625 jettyPlugin.version 8.1.10.v20130312 java 1.7.25

Thanks for answer!

Upvotes: 0

Views: 994

Answers (1)

user2663275
user2663275

Reputation: 1

I've the same issue, that just caused by a static method in HttpConnection, which would generate a threadLocale. and it used initValue() method, but I cannot found why this method would hardly return null in a short time.
We can find all of these is happening under tomcat.

When I change to run it in jetty, it goes well.

So we can realize that the websocket module of jetty is not independent, but based on jetty server. We'd better implement a websocketServlet.

Upvotes: 0

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