[marcmac]

restarting tomcat did not help.

Have you rebooted the server?

What is this set to:
zmlocalconfig tomcat_java_options

You've got 4 gigs of ram - is this box running in a virtual server?

Is this a 64 bit machine (more importantly, are you running a 64 bit OS?)

What else is running on the box?

Which version are you running (FOSS or network?)