How to set default system java heap Xmx limits? - Red Hat Customer Portal

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Issue

I need to set default limits on java processes since my users are over-allocating memory on my servers. I can't use a hard ulimit on virtual memory.
I have set JAVA_OPTS="-Xms200m -Xmx2000" in /etc/profile and /etc/csh.login and JAVA_OPTS shows up as an environmental variable when a user logs in, but these defaults are never added to a user's java process/program when it starts.
How do I define a default heap size for java processes?

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6

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