I've just verified that the app works ok on Tomcat in both cases, so it really
seems like a bug in Jetty. I've filed
https://github.com/eclipse/jetty.project/issues/6130
On 04/04/2021 15:27, Piotr Morgwai Kotarbinski wrote:
> Hi all,
> It seems that adding websocket endpoints programmatically (via
> ServerContainer.addEndpoint) does not work in jetty-10.0.x or at least I
> can't get it to work ;-]
> Here is the code from my ServletContextListener:
>
>> public void contextInitialized(ServletContextEvent event) {
>> try {
>> var container = ((ServerContainer)
>> event.getServletContext().getAttribute(
>> "javax.websocket.server.ServerContainer"));
>> container.addEndpoint(
>>
>> ServerEndpointConfig.Builder.create(EchoEndpoint.class,
>> "/websocket/echo").build());
>> } catch (Exception e) {
>> System.err.println("adding endpoint failed: " + e);
>> }
>> }
>
> ...and here is the endpoint just in case:
>
>> //@ServerEndpoint("/websocket/echo")
>> public class EchoEndpoint {
>>
>> Session session;
>>
>> public EchoEndpoint() { System.out.println("new endpoint instance
>> created"); }
>>
>> @OnOpen
>> public void onOpen(Session session) {
>> System.out.println("new session opened: " + session.getId());
>> this.session = session;
>> session.setMaxIdleTimeout(5l * 60l * 1000l);
>> }
>>
>> @OnMessage
>> public void onMessage(String message) {
>> session.getAsyncRemote().sendText(message); }
>> }
>
> each time the browser app attempts to open a websocket, the container will
> create a new endpoint instance (`new endpoint instance created` message from
> the constructor will appear on the console), but the `onOpen` method will not
> get called (the message from the method does not appear on the console) and
> the server will close the socket immediately. no sign of any exception
> stacktrace on the console.
>
> However, if the `@ServerEndpoint` annotation is uncommented at the top of the
> `EchoEndpoint` and the `ServletContextListener` is removed, then everything
> works ok.
>
> you can see the whole app at https://github.com/morgwai/jetty-websocket
>
> am I doing something wrong or is it some bug in Jetty?
>
> I've tried Jetty versions 10.0.0 and 10.0.2 running on openjdk-11 on
> ubuntu-18.04
>
> Thanks!
>
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