Does he ever get a Heap Space exception? Does he ever even fill at least have of the Heap Space? If not, it may just be that the JVM hasn't felt that a GC run has been necessary yet. Also, even if it has, Java only reserves from the system the min heap space, then, as that is surpassed will periodically reserve more until the Maximum Heap Space has been reached. But the JVM never releases that memory back to the System. So, even though the memory usage of the JVM seems to go up and up and up, from the System view, that doesn't mean there is any kind of memory problem. Find a profiler and monitor the actual Heap Space, not the system memory usage of the JVM.
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