OutOfMemory error due to system.gc() call. In the GC logs i can see a Full GC (System), once or twice a day since it was started.On the Full GC with the CMS collector,it's simply a case ofthe CMS collector failing to free up sufficient space quick enough ORheap is fragmented with insufficient contiguous space for object allocationwhich then leads to the GC defaulting to the throughput(stop-the-world) compacting collector.