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This page discusses various memory issues. In a nutshell - if your computer has less than 128MB of ram - you will probably have trouble. Anyhow, also read the following threads for other memory related issues:

• java.lang.OutOfMemoryError during deploy
• Memory requirements
• Memory Mgmt Tomcat
• Tomcat Out of memory
• Tracking memory usage over time
  

Also look at JProbe, YourKit or OptimizeIt, or other profiling tools. Lots of people recommend these tools. This is not an endorsement for them, I just notice other people like them.

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