Java SE client source code?

[carenot]

Thanks for you answer.

I managed to get the sessionId by adding a onSessionStartedExt method to my ConnectionListener.

Looking forward to the open source date.

[DarioCrivelli]

You are right. Sorry for even forgetting about that later extension to the library interface, which however is still undocumented.
You must have also discovered that it is enabled by setting the "lightstreamer.extended_session_info" JVM property to any value.
Since the session ID is no longer considered an implementation aspect, but it is also supplied by the new libraries, this technique for the old library can now be disclosed.