Limit memory usage for a user

Hi,

We have a situation, where our memory parameter tuning is as per the regular calculations.

But sometimes, a single user is consuming all the memory of a application server and leading to hanging that server.

When we received alerts, system used to be struck and taking long time to bring the system to normal.

1. Is there any parameter to limit the memory usage at user level... i.e any user session should terminate or failed to get memory even memory is available in that particular application server. No issues even the session cancelled by throwing any type of dump.

Is there any parameter in java to limit the user/thread to use particular amount of memory like  in case of ABAP.

Thanks in advance

vijendar