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Posted to issues@artemis.apache.org by "Daniel Martin (Jira)" <ji...@apache.org> on 2026/05/29 07:45:00 UTC
[jira] [Created] (ARTEMIS-6085) Null pointer exception calling `MQTTSessionState.getSession()`
Daniel Martin created ARTEMIS-6085:
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Summary: Null pointer exception calling `MQTTSessionState.getSession()`
Key: ARTEMIS-6085
URL: https://issues.apache.org/jira/browse/ARTEMIS-6085
Project: Artemis
Issue Type: Bug
Reporter: Daniel Martin
{{I found this among my broker's logs:}}
{{}}
{code:java}
2026-05-28 16:19:43,429 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=99], variableHeader=MqttConnectVariableHeader[name=MQTT, version=5, hasUserName=true, hasPassword=true, isWillRetain=false, isWillFlag=false, isCleanSession=false, keepAliveTimeSeconds=30], payload=MqttConnectPayload[clientIdentifier=xyz-1, willTopic=null, willMessage=null, userName=artemis, password=[99, 50, 56, 54, 100, 56, 51, 49, 48, 98, 99, 102, 98, 49, 99, 50, 102, 57, 101, 98, 48, 49, 57, 56, 102, 100, 101, 49, 49, 56, 102, 54, 97, 52, 53, 51, 48, 57, 56, 48, 98, 99, 48, 51, 51, 99, 99, 55, 56, 100, 97, 52, 57, 97, 56, 53, 54, 98, 99, 97, 100, 55, 57, 99]]]java.lang.NullPointerException: Cannot invoke "org.apache.activemq.artemis.core.protocol.mqtt.MQTTSessionState.getSession()" because the return value of "org.apache.activemq.artemis.core.protocol.mqtt.MQTTStateManager.getSessionState(String)" is nullat org.apache.activemq.artemis.core.protocol.mqtt.MQTTProtocolHandler.handleLinkStealing(MQTTProtocolHandler.java:484)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(Unknown Source)at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1.run(ActiveMQThreadFactory.java:120) {code}
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