Wildfly version: 8.2.0.Final

Undertow version: 1.1.0.Final

I am using Undertow web sockets.

A remote client (nopoll c client) attempts to open a websocket session; the session is opened and the client immediately sends a message.

However, at the ServerEndpoint, the onMessage handler is called prior to the onOpen handler.

My server side implementation rejects messages received prior to open and even forces a session close.

The client retries the session, and sometimes it is successful i.e. I do see an open first and then followed by a message by the client.

Is this an known issue?

Sorry, I couldn’t find a way to search the mailing-list archives.