[Bug 56026] RemoteEndpoint.Async#sendText(String, SendHandler) not thread safe

[bu...@apache.org]

https://bz.apache.org/bugzilla/show_bug.cgi?id=56026

--- Comment #12 from balusc <ba...@gmail.com> ---
Just in case, I investigated this issue for JSF <f:websocket> and OmniFaces
<o:socket> too. This threadsafety problem doesn't occur on Jetty, Undertow
(WildFly) nor Tyrus (GlassFish/Payara). It occurs on Tomcat only.

Work around was to synchronize session:

    synchronized (session) {
        results.add(session.getAsyncRemote().sendText(text));
    }

Frankly, this kind of contradicts the javax.websocket.Session javadoc
http://docs.oracle.com/javaee/7/api/javax/websocket/Session.html:

> Session objects may be called by multiple threads. Implementations must ensure the integrity of the mutable properties of the session under such circumstances.

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