Full gc's/Application non-responsiveness

I have a web application that proceeds through a series of minor collections followed by the occasional major/full collection. After a period of time, the application becomes non-responsive and the vm goes into the process of doing full collection after full collection. Can someone explain or point me towards articles explaining theoretical possibilities of what is occuring. To avoid this situation should I concentrate on increasing max memory to the vm, should I focus on increasing the new size, other...? The amount of memory after each collection is relatively constant. Thanks in advance...

Sounds like the heap is getting full and the JVM is working aggressively to make more room. Perhaps the problem is it hits its maximum heap size and it cannot make anymore room. I'm no expert on this topic, though I'm interested in it.
If you're brave, you can try reading: http://java.sun.com/docs/hotspot/gc/index.html
Also, there is a pretty good JDC Tech Tip article giving an explanation of the basics of garbage collection with a testbed program if you haven't seen it already:
http://developer.java.sun.com/developer/TechTips/2000/tt1222.html
Good luck -
- Chris

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