Java project with excessive recompilation

I have a large Java project with the property that IDEA often wants to recompile everything for no obvious reason. IDEA even recompiles a module with no dependencies other than on the system JDK. I would like to figure out what is triggering these full recompilations so that I can stop this from happening. Does anyone have any suggestions on what could be the trigger or how I can track this down?

I'm on Mac OS 10.6.5 in case it matters. The behavior has not changed from IDEA 9 to 10.

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