Issue

• When stopping a broker that uses the levelDB persistent store the following exception is thrown

ERROR ManagedQueueRegion - Could not stop service: QueueRegion: destinations=12, subscriptions=0, memory=0%. Reason: java.lang.NullPointerException
java.lang.NullPointerException
    at org.fusesource.hawtdispatch.package$RichExecutor.execute(hawtdispatch.scala:171)
    at org.fusesource.hawtdispatch.package$RichExecutorTrait$class.apply(hawtdispatch.scala:68)
    at org.fusesource.hawtdispatch.package$RichExecutor.apply(hawtdispatch.scala:169)
    at org.fusesource.hawtdispatch.package$RichExecutorTrait$class.future(hawtdispatch.scala:116)
    at org.fusesource.hawtdispatch.package$RichExecutor.future(hawtdispatch.scala:169)
    at org.fusesource.hawtdispatch.package$RichExecutorTrait$class.sync(hawtdispatch.scala:107)
    at org.fusesource.hawtdispatch.package$RichExecutor.sync(hawtdispatch.scala:169)
    at org.apache.activemq.leveldb.DBManager.destroyPList(DBManager.scala:858)
    at org.apache.activemq.leveldb.LevelDBStore.removePList(LevelDBStore.scala:558)
    at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.destroyDiskList(FilePendingMessageCursor.java:171)
    at org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.destroy(FilePendingMessageCursor.java:166)
    at org.apache.activemq.broker.region.cursors.StoreQueueCursor.stop(StoreQueueCursor.java:82)
    at org.apache.activemq.broker.region.Queue.stop(Queue.java:1056)
    at org.apache.activemq.broker.region.AbstractRegion.stop(AbstractRegion.java:118)
    at org.apache.activemq.util.ServiceStopper.stop(ServiceStopper.java:41)
    at org.apache.activemq.broker.region.RegionBroker.doStop(RegionBroker.java:623)
    at org.apache.activemq.broker.jmx.ManagedRegionBroker.doStop(ManagedRegionBroker.java:128)
    at org.apache.activemq.broker.region.RegionBroker.stop(RegionBroker.java:205)
    at org.apache.activemq.broker.BrokerFilter.stop(BrokerFilter.java:187)
    at org.apache.activemq.broker.TransactionBroker.stop(TransactionBroker.java:198)
    at org.apache.activemq.broker.BrokerFilter.stop(BrokerFilter.java:187)
    at org.apache.activemq.broker.BrokerFilter.stop(BrokerFilter.java:187)
    at org.apache.activemq.broker.BrokerFilter.stop(BrokerFilter.java:187)
    at org.apache.activemq.broker.BrokerFilter.stop(BrokerFilter.java:187)
    at org.apache.activemq.plugin.RuntimeConfigurationBroker.stop(RuntimeConfigurationBroker.java:165)
    at org.apache.activemq.broker.MutableBrokerFilter.stop(MutableBrokerFilter.java:192)
    at org.apache.activemq.broker.BrokerPluginSupport.stop(BrokerPluginSupport.java:46)
    at org.apache.activemq.broker.BrokerService$5.stop(BrokerService.java:2169)
    at org.apache.activemq.util.ServiceStopper.stop(ServiceStopper.java:41)
    at org.apache.activemq.broker.BrokerService.stop(BrokerService.java:762)
    at org.apache.activemq.xbean.XBeanBrokerService.stop(XBeanBrokerService.java:122)
    at org.apache.activemq.console.command.StartCommand$1.run(StartCommand.java:104)