resolve intermittent hang of JDBCQueueMasterSlaveTest - shutdown of the executor used to check the db lock during shutdown may cause the shutdown thread to interrupt and die before shutdown is complete. A wait for shutdown to complete can hang forever. Just cancelling the periodic tasks is sufficient
activemq/trunk/activemq-core/src/main/java/org/apache/activemq/store/jdbc/DefaultDatabaseLocker.java