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https://issues.apache.org/jira/browse/AMQ-5097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13971380#comment-13971380
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Timothy Bish commented on AMQ-5097:
-----------------------------------
Try creating a unit test to reproduce.
> ElectingLevelDBStore - NPE in doStop
> ------------------------------------
>
> Key: AMQ-5097
> URL: https://issues.apache.org/jira/browse/AMQ-5097
> Project: ActiveMQ
> Issue Type: Bug
> Components: activemq-leveldb-store
> Affects Versions: 5.10.0
> Reporter: Claus Ibsen
> Priority: Minor
>
> I copied the examples/conf/activemq-leveldb-replicating.xml to the conf
> directory and started AMQ
> bin/activemq console xbean:conf/activemq-leveldb-replicating.xml
> Then after a while it give up, and you get this NPE
> {code}
> ERROR | Could not stop service: Replicated
> LevelDB[/opt/apache-activemq-5.10-SNAPSHOT/data,
> 127.0.0.1:2181//activemq/leveldb-stores]. Reason:
> java.lang.NullPointerException
> java.lang.NullPointerException
> at
> org.apache.activemq.leveldb.replicated.ElectingLevelDBStore.doStop(ElectingLevelDBStore.scala:276)
> at org.apache.activemq.util.ServiceSupport.stop(ServiceSupport.java:71)
> at org.apache.activemq.util.ServiceStopper.stop(ServiceStopper.java:41)
> at org.apache.activemq.broker.BrokerService.stop(BrokerService.java:775)
> at
> org.apache.activemq.xbean.XBeanBrokerService.stop(XBeanBrokerService.java:122)
> at
> org.apache.activemq.broker.BrokerService.start(BrokerService.java:601)
> at
> org.apache.activemq.console.command.StartCommand.runTask(StartCommand.java:88)
> at
> org.apache.activemq.console.command.AbstractCommand.execute(AbstractCommand.java:57)
> at
> org.apache.activemq.console.command.ShellCommand.runTask(ShellCommand.java:150)
> at
> org.apache.activemq.console.command.AbstractCommand.execute(AbstractCommand.java:57)
> at
> org.apache.activemq.console.command.ShellCommand.main(ShellCommand.java:104)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at org.apache.activemq.console.Main.runTaskClass(Main.java:262)
> at org.apache.activemq.console.Main.main(Main.java:115)
> ERROR | Could not stop service: Replicated
> LevelDB[/opt/apache-activemq-5.10-SNAPSHOT/data,
> 127.0.0.1:2181//activemq/leveldb-stores]. Reason:
> java.lang.NullPointerException
> {code}
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