Memory Utilization by java.exe

After i would say a week of uptime i notice that i am not getting on the home page any type of "Servers with high CPU..." or Routers with high Memory ..." and at the same time i no longer seem to get any notifications of faults. During this time i also get no reporting on interface utilization ect...

I then remote into the server and notice that java.exe is using over 1GB of ram. The processor seems fine but memory only has around 50MB free. This is obviously the problem but i am unsure if java.exe should be using over 1GB of ram.

I then attempt to restart the Opmanager service and it fails to stop. I then manually kill the process java.exe and then the service is stopped. Then i can start the service again and things work great for another week and the process starts all over again.

Before today System specs:
Windows Server 2003 R2 Standard - 64 Bit
2GB RAM
Intel Pentium 4 D 2.8GHZ CPU

After todays upgrade:
Windows Server 2003 R2 Standard - 64 Bit
4GB RAM
Intel Pentium 4 D 2.8GHZ CPU

I am currently monitoring around:
13 Servers
24 Routers
2 Switches
1 UPS
2 Domain Controllers

I hope the memory upgrade will help, well it couldn't hurt :)

Any way to tune memory utilization?
Is this a memory leak?

Any ideas?

Thanks

Michael