For deserialization error this makes sense (you probably would also want to add the session id to the invalidSessionsCache), but not for other issues like a timeout. So this case should be handled more specifically and the session should not be deleted for all exceptions.
Having a test for this would be uber cool! :-)

Added the session Id to the invalidSessionCache and made the exception more specific.

Furthermode I added a simple test for the case of a desiralization error, a more complete integration test is out of scope at the moment.

Looks good, nice test :-)

The TranscoderDeserializationException should also be thrown by other transcoders, but I can do this as well once I'm back from holidays.

Thanx for the PR, I changed other transcoders to throw the TranscoderDeserializationException as well.