I've never encountered this error before, but
I think it could be for a number of reasons -
maye you are trying to pass too many SQL transactions to the db - have you got autocommit on or off ? Are there restrictions on how many transactions you can submit simultaneously ?
are you connection pooling your servlet to db connections ? If not, then the db may be falling over if trying to connect on same port ?
Can you post back exact error message and the db you are using ...
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