Justin Bertram created ARTEMIS-5575:
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Summary: Potential NPE during MQTT link stealing
Key: ARTEMIS-5575
URL: https://issues.apache.org/jira/browse/ARTEMIS-5575
Project: ActiveMQ Artemis
Issue Type: Bug
Reporter: Justin Bertram
Assignee: Justin Bertram
There's a potential NPE due to a race condition in the logic handling MQTT link
stealing that I recently saw in the test-suite. Here's the exception:
{noformat}
ERROR [org.apache.activemq.artemis.core.protocol.mqtt] AMQ834002: Error
processing control packet:
MqttConnectMessage[fixedHeader=MqttFixedHeader[messageType=CONNECT,
isDup=false, qosLevel=AT_MOST_ONCE, isRetain=false, remainingLength=21],
variableHeader=MqttConnectVariableHeader[name=MQTT, version=4,
hasUserName=false, hasPassword=false, isWillRetain=false, isWillFlag=false,
isCleanSession=false, keepAliveTimeSeconds=1],
payload=MqttConnectPayload[clientIdentifier=reconnect, willTopic=null,
willMessage=null, userName=null, password=null]]
java.lang.NullPointerException: Cannot invoke
"org.apache.activemq.artemis.core.protocol.mqtt.MQTTConnection.getRemoteAddress()"
because "existingConnection" is null
at
org.apache.activemq.artemis.core.protocol.mqtt.MQTTProtocolHandler.handleLinkStealing(MQTTProtocolHandler.java:493)
at
org.apache.activemq.artemis.core.protocol.mqtt.MQTTProtocolHandler.handleConnect(MQTTProtocolHandler.java:258)
at
org.apache.activemq.artemis.core.protocol.mqtt.MQTTProtocolHandler.act(MQTTProtocolHandler.java:161)
at org.apache.activemq.artemis.utils.actors.Actor.doTask(Actor.java:32)
at
org.apache.activemq.artemis.utils.actors.ProcessorBase.executePendingTasks(ProcessorBase.java:69)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at
org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1.run(ActiveMQThreadFactory.java:120){noformat}
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