https://issues.apache.org/jira/browse/AMQ-3507 - Large number of expiring messages causing QueueSize to groww. have cursor delegate to the destination for expiry processing. additional test. This will also sort out the intermittent failure of this test.
activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/cursors/FilePendingMessageCursor.java