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We are running a Java application that sometimes "freezes" because some thread is using almost all the heap. Despite the JVM doing Full GC that last more than 60 seconds the application never dies with OutOfMemoryError.

I am facing above exception followed by OutOfMemoryException. JVMDUMP013I Processed Dump Event "systhrow", detail "java/lang/OutOfMemoryError". ERROR [Store org.appfuse.model.User Spool Thread] DiskStore.throwableSafeExpireElementsIfRequired(620) | org.appfuse.model.User Cache: Could not expire elements from disk due to null. Continuing... java.lang.OutOfMemoryError at java.util.Collections$SynchronizedMap . values (Unknown Source) at net.sf.ehcache.store.DiskStore . expireElements at net.sf.ehcache.store. DiskStore . Exception in thread "QuartzScheduler_QuartzSchedulerThread" java.lang.OutOfMemoryError at java.lang.String.<init>(String.java:364) at org.quartz.Trigger.getFullName(Trigger.java:435) at org.quartz.simpl.TriggerComparator.compare(RAMJobStore.java:1408) at java.util.TreeMap.find(Unknown Source) at java.util.TreeMap.remove(Unknown Source) at java.util.TreeSet.remove(Unknown