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Prior to upgrading this site to Java 5 and Tomcat 5.5, I used to run into lots of memory related problems. Tomcat 4 would tend to use an awful lot of memory servicing individual requests, which would eventually lead to the JVM exchausting the available heap. After the upgrade, my JVM is using a much smaller amount of the memory it was previously. After 14 days uptime, here are the JVM stats taken from my blog.

This is a great testament to the advances made in Java 5 and the newer versions of Tomcat. Upgrade if you can.