OutOfMemoryError in ActiveMQ Broker due to large KahaDB PageFile instance

Solution Verified - Updated -

Issue

The ActiveMQ broker runs out of memory:
java.lang.OutOfMemoryError: Java heap space.

Upon inspection of the heap dump that was written at the time of the OutOfMemoryError , it shows a large instance of org.apache.activemq.store.kahadb.KahaDBStore, retaining several hundred MB of JVM heap.

This instance internally references a org.apache.activemq.store.kahadb.disk.page.PageFile which accumulates around the same amount of heap space.

This PageFile instance holds a reference to org.apache.activemq.util.LRUCache that contains 10,000 entries and retains most of the heap space.

Environment

  • JBoss Fuse 6.3 R5

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