Java Optimization on RHEL

[Chris Purcell]

We're about to set up an active/passive cluster on two RHEL ES 3.0
servers.  The servers will host a Java app that is very resource
intensive.  The servers are Compaq ProLiant DL380's with dual P4's and
4GBs of RAM each.

I don't know anything about Java, I just do the system administration
here.  Are there any Java performance tuning tweaks that can be done to
the servers to improve the performance of the servers?

Thanks,
Chris