Hello Martin, WebSocketBehavior seems to be broken, I guess it is caused by [1] , but not sure
here is quickstart: https://github.com/solomax/wicket-websocket The error differs depending on this line [2] commented or not This is blocker for our project :( sorry for reporting this after release, I was on vacation :( [1] https://github.com/apache/wicket/commit/b6225514d9ad35a545750e2930485e212e95ca88 [2] https://github.com/solomax/wicket-websocket/blob/master/src/main/java/org/apache/solomax/WicketApplication.java#L39 -- WBR Maxim aka solomax
