I would agree with installing NMON and monitoring. However, I had two
H80's on 4.3.3 ml 09, oracle 8.1.7 and 6h1's with 5.2 and oracle 9.2.
They too loose memory and paging space, but I found with help from our
developers that it was not java but was the listener process to the
database. Try bouncing the listeners for the apps servers, when I've
done this for my db servers, the memory has returned.

HTH,
Pete's