Java 1.4.2 version CPU spike to 100%, require tools to monitor CPU spike

Hi,
When using our application CPU is spiked to 100% (Suspecting memory leak here). The Java version used is Java 1.4.2_04. This CPU spike is seen only when more users are logged in (may be around 25 users and more).
Any tools to monitor the CPU spike (other than perfmon) ? How to nail down the memory leak issue or CPU spike in code perspective.
Please suggest some tools to do monitoring as well..
Thanks in Advance.

It's quite heard to create a memory leak with Java (except from creating objects in a loop or something like that). Perhaps it's only the garbage collector? If you have a memory leak you don't only get a CPU spike, but the VM will exit if the heap space is full.
I used JProfiler before and it's really good.

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