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https://issues.apache.org/jira/browse/ARTEMIS-1998?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justin Bertram resolved ARTEMIS-1998.
-------------------------------------
Resolution: Duplicate
> NPE in MQTTProtocolManager.isClientConnected
> --------------------------------------------
>
> Key: ARTEMIS-1998
> URL: https://issues.apache.org/jira/browse/ARTEMIS-1998
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Components: MQTT
> Affects Versions: 2.4.0, 2.6.2
> Reporter: Assen Sharlandjiev
> Priority: Minor
>
> I've encountered the following unhandled null pointer exception
> {code:java}
> 2018-05-24 07:02:52.632 WARN 5030 --- [mpl$5@7c3e4b1a)]
> o.a.a.a.utils.actors.OrderedExecutor : null java.lang.NullPointerException:
> null at
> org.apache.activemq.artemis.core.protocol.mqtt.MQTTProtocolManager.isClientConnected(MQTTProtocolManager.java:182)
> at
> org.apache.activemq.artemis.core.protocol.mqtt.MQTTConnectionManager.disconnect(MQTTConnectionManager.java:150)
> at
> org.apache.activemq.artemis.core.protocol.mqtt.MQTTFailureListener.connectionFailed(MQTTFailureListener.java:37)
> at
> org.apache.activemq.artemis.core.protocol.mqtt.MQTTConnection.fail(MQTTConnection.java:146)
> at
> org.apache.activemq.artemis.core.remoting.server.impl.RemotingServiceImpl$FailureCheckAndFlushThread$2.run(RemotingServiceImpl.java:734)
> at
> org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:42)
> at
> org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:31)
> at
> org.apache.activemq.artemis.utils.actors.ProcessorBase$ExecutorTask.run(ProcessorBase.java:53)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> Perhaps a null check should be added to the connectedClients.get(clientId).
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