Java Memory Problem

Hi,
We are using apache and tomcat webserver for our site (built on Unix). We are experiencing a serious problem with java memory.
For every 1 hour (at around 1000-1500 page hits), site is getting down and giving error,'java.lang.OutOfMemoryError'.
We observed that the memory consumed by java parocess is not being garbage collected. It is building up gradually and reaching its max limit(128M), and then site is getting down, throwing exception 'java.lang.OutOfMemoryError'.
I dont under stand what to do.
Can you please suggest me what to do to fix the problem..
thankyou,
Mo

Test run your server with java -Xloggc:<file> option which logs GC activity. This should give you a clue as to how often gc is running and how much of mem it reclaimed in each cycle. This is just an initial test. Once u know for sure that enough mem is not being reclaimed then you use some memory profiler tools and identify the memory leak and fix the code to release unwanted references.

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