ys i though the same and did clustering for it now i have 4 JVM 2 on each server, when i run the test the connection exhasut after say 50 mins.
its happing for the test for application where the users will view some stats and accept it , this acceptation will updates some values in table if user exist in table else insert it ,
i think heavy insert of update is causing the problem and not able to find that excatly needs to be tuuned up to help easier way for this update or insert.
if i test for senarios where will jus some and view some content thats works fine