JVM Memory usage going up and up for WL 6.1 SP3

Hi there,

I have an old application running on OpenVMS JDK 1.3.1 Compaq and Weblogic 6.1
SP3.

The trouble is when it isn't doing anything at all, in the performance tab the
memory usage goes up and up in a liner fashion on the graph, even though its not
doing anything at all and there is no throughput.

Its currently set for min and max heap size of 900m. All it does it reach it
then garbage collects then starts again going up to the maximum. Even though
nothing is coming in and its idle.

Could someone give me some suggestions on what it could be??

Should I lower the max heap size to say 512 so garbage collection is more
frequent? And why would the memory usage go up and up and up when its idle?

Kind Regards,