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Hi Björn,

running our application on JBoss Server the server logs a ClassCastException whenever a new client starts. There seems to be no negative side effects in the application.

2021-10-27 09:08:05,910 MESZ ERROR [io.undertow.websockets.jsr.request] (default task-1) UT026001: Unable to instantiate endpoint: java.lang.ClassCastException: org.eclnt.jsfserver.polling.websocket.WebSocketPollingEndPoint cannot be cast to javax.websocket.Endpoint

JBoss contains websocket API 1.1.

Setting <blockerinfo active="false"/> in system.xml makes the exception disapear.

Is there a better solution?

Regards
Axel

Hi,

uuuh: we are using annotation based endpoint implementation. Please check e.g. https://www.baeldung.com/java-websockets for difference between annotation-based and extension-based implementation. It is part of JEE7 (see: https://docs.oracle.com/javaee/7/tutorial/websocket004.htm).

...is your JBoss such old!?? ;-)
Anyway: switching off by system.xml is the right way to avoid problems with our own usage of WebSockets.

Kind regards! Björn