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From "Romain Manni-Bucau (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TOMEE-1649) Websockets Memory Leak
Date Wed, 01 Jun 2016 11:01:05 GMT

    [ https://issues.apache.org/jira/browse/TOMEE-1649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15310130#comment-15310130
] 

Romain Manni-Bucau commented on TOMEE-1649:
-------------------------------------------

on their bugzilaa (see http://tomcat.apache.org/bugreport.html for more details)

About workarounds I suspect a @Schedule can do the trick if you call yourself close() on the
disconnected sessions. Note tomcat has a org.apache.tomcat.websocket.BackgroundProcessManager
which could be used to monitor this kind of staled connections at their level too.

> Websockets Memory Leak
> ----------------------
>
>                 Key: TOMEE-1649
>                 URL: https://issues.apache.org/jira/browse/TOMEE-1649
>             Project: TomEE
>          Issue Type: Bug
>          Components: TomEE Core Server
>    Affects Versions: 1.7.2, 1.7.3
>            Reporter: Tony Weston
>            Assignee: Romain Manni-Bucau
>            Priority: Blocker
>             Fix For: 7.0.0-M2
>
>
> Websocket sessions are not GC'd on close.  This will quickly lead to out-of-memory condition,
and server hang.  I have marked this is a blocker as any application that uses Websockets
will have this issue, and there is no workaround; it is not a corner case. 
> To reproduce, create a Websocket handler, and index.html to create the socket. See below.
  Load index.html in a browser, and refresh the page several times.
> Using VisualVM (or other memory profiler), search for websocket in the heap dump.   
You should find that every refresh of the page will cause an additional instance of WsSession,
and other supporting classes.
> These instances are referenced by org.apache.openejb.core.WebContext /  creationalContexts,
and do not appear to be removed when the websocket is closed.
> {code:title=MyWebsocket.java}
> import javax.enterprise.context.ApplicationScoped;
> import javax.websocket.OnClose;
> import javax.websocket.OnOpen;
> import javax.websocket.Session;
> import javax.websocket.server.ServerEndpoint;
> @ServerEndpoint(value = "/ws")
> public class MyWebsocket {
> 	@OnOpen
> 	public void wsOpen(Session session){
> 		System.out.println("WS Opened");
> 	}
> 	
> 	@OnClose
> 	public void wsClosed(Session session){
> 		System.out.println("WS Closed");
> 	}
> }
> {code}
> Amend the ws://localhost:8080/WebsockMemleak/ws  url in the source below, to match your
context root / port number.
> {code:title=index.html}
> <html>
> <script>
> var ws = new WebSocket("ws://localhost:8080/WebsockMemleak/ws");
> window.onbeforeunload = function(){
> 	ws.close();
> }
> </script>
> </html>
> {code}



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