Jetty 7 embedded configuration for websockets, servlets AND resource handlers

Question

I am trying to configure embedded Jetty (7.6) to handle the WebSocketHandler, ServletContextHandler and ResourceHandler classes at the same time.

I have tried using both HandlerCollection and HandlerList classes but I can't get all 3 parts to work.

  Server server = new Server(8081);

  // static files handler
  ResourceHandler resourceHandler = new ResourceHandler();
  resourceHandler.setDirectoriesListed(true);
  resourceHandler.setResourceBase("./src/main/webapp/");

  // servlet handler
  ServletContextHandler servletContextHandler = new ServletContextHandler(ServletContextHandler.SESSIONS);
  servletContextHandler.setContextPath("/");
  servletContextHandler.addServlet(new ServletHolder(new myServlet()), "/myServlet");

  // websocket handler
  myWebSocketHandler myWebSocketHandler = new myWebSocketHandler();

  // putting it together
  HandlerCollection handlerList = new HandlerCollection();
  handlerList.setHandlers(new Handler[]{resourceHandler,myWebSocketHandler,servletContextHandler});
  server.setHandler(handlerList);

In this state, the static files and the servlet are handled fine, but when I send a websocket request, I get:

2012-02-22 10:16:44.703:WARN:oejs.Response:Committed before 503 null
2012-02-22 10:16:44.705:WARN:oejs.AbstractHttpConnection:/
java.lang.IllegalStateException: Committed
    at org.eclipse.jetty.server.Response.resetBuffer(Response.java:1080)
...

and if I check the state of the base requests "handled" property inside my websockets handler, it's already set to true. So this means that my request is being handled and committing before it gets to myWebSocketHandler?

Any comments are appreciated, thanks.

score 6 · Accepted Answer · answered Feb 22 '12 at 23:57

Have you tried simply switching the order of the handlers?

 handlerList.setHandlers(new Handler[]{myWebSocketHandler,servletContextHandler,resourceHandler});

Jetty runs the handlers in the order you add them, and the resource handler handles every request that comes its way (potentially by serving a 404 error).

score 3 · Answer 2 · answered Apr 17 '12 at 14:53

I had the same problem but using only websocketHandler and resourceHandler. I solve it setting the resourceHandler into the websocketHandler:

public static void main(String[] args) {
    try {
        Server server = new Server(8081);

        ResourceHandler resourceHandler = new ResourceHandler();
        resourceHandler.setResourceBase("./chat");

        WebSocketHandler chatWebSocketHandler = new ChatWebSocketHandler();
        chatWebSocketHandler.setHandler(resourceHandler);

        HandlerList handlers = new HandlerList();
        handlers.setHandlers(new Handler[]{chatWebSocketHandler});

        server.setHandler(handlers);

        server.start();
        // Jetty server is stopped when the Thread is interrupted.
        server.join();
    } catch (Throwable e) {
        e.printStackTrace();
    }
}

Jetty 7 embedded configuration for websockets, servlets AND resource handlers

2 Answers2