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If you refresh the page, the old page should be destroyed before it can get the session close notification;
but if you open a new page on a different browser, the previous page is supposed to...

Sorry but now I'm no longer sure I understood your goals correctly.
If a page is handling a session S1 and gets the refresh, then the new page tries to open a second session S2.
In this scenario,...

The code you added seems unneeded.
The problem here is that we must agree on how the Server will invoke your Metadata Adapter.

When I said that "you should rely on the Server to call...

Hi, there was a misunderstanding.
When I suggested "you should instead just throw a ConflictingSessionException" and "At this stage, you shouldn't do anything else and leave the "sessions" and...

I see that you look for an existing session with the same user and, if found, you remove it from the "sessions" Map.
But this has no effect on Lightstreamer Server as the "sessions" Map is yours....