RTC 3.0 iFix1 - Tomcat Heap full after 2 days. Is that OK?

Setting the scene:
jts and ccm on out-of-the-box Tomcat, on RHEL 5.6 w/8GB RAM. jts and ccm are all it does.
Database is DB2 on a nearby IBM i.

After 2-3 days, Server status looks like so:
http://dl.dropbox.com/u/3169699/FullHeap.jpg

The logs are clean, but this rapid filling up of the JVM VM to the brim looks ... alarming. I've seen several installations of 3.0 in differnet configs. They generally lope along for days, weeks or months at something like 23% of 333MB of 4GB. I don't recall ever seeing this full VM thing happen.

IBM Support suggests this is just normal query caching and is nothing to worry about.

Should I worry?

Thanks,
Larry.

Sorry, Anthony - to answer your question, there were a few, small builds (2-3 source artifacts identified in change sets) going on. No dependency builds, nothing fancy, only 4 users, maybe 10 Work Items created and workflow'ed in the 3 days or so that it lasted before the OOM condition killed it.

- Larry.