Running Artemis 2.28.0 in HA cluster active:stanby pair under Kubernetes. System will run for a period of time and then we will start seeing these messages in the log. What does this mean?
2023-10-04 20:50:53,098 ERROR [org.apache.activemq.artemis.core.protocol.mqtt] AMQ834002: Error processing control packet: MqttSubscribeMessage[fixedHeader=MqttFixedHeader[messageType=SUBSCRIBE, isDup=false, qosLevel=AT_LEAST_ONCE, isRetain=false, remainingLength=110], variableHeader=MqttMessageIdAndPropertiesVariableHeader[messageId=1, properties=io.netty.handler.codec.mqtt.MqttProperties@79b1f918<mailto:properties=io.netty.handler.codec.mqtt.MqttProperties@79b1f918>], payload=MqttSubscribePayload[MqttTopicSubscription[topicFilter=trusted/+/nfs/dropped_messages/myhost1:22, option=SubscriptionOption[qos=AT_MOST_ONCE, noLocal=false, retainAsPublished=false, retainHandling=SEND_AT_SUBSCRIBE]], MqttTopicSubscription[topicFilter=trusted/+/nfs/server/state, option=SubscriptionOption[qos=AT_MOST_ONCE, noLocal=false, retainAsPublished=false, retainHandling=SEND_AT_SUBSCRIBE]], MqttTopicSubscription[topicFilter=trusted/+/nfs/client/state, option=SubscriptionOption[qos=AT_MOST_ONCE, noLocal=false, retainAsPublished=false, retainHandling=SEND_AT_SUBSCRIBE]]]] java.util.NoSuchElementException: null at org.apache.activemq.artemis.utils.collections.LinkedListImpl$Iterator.next(LinkedListImpl.java:581) ~[artemis-commons-2.28.0.jar:?] at org.apache.activemq.artemis.utils.collections.PriorityLinkedListImpl$PriorityLinkedListIterator.next(PriorityLinkedListImpl.java:287) ~[artemis-commons-2.28.0.jar:?] at org.apache.activemq.artemis.core.server.impl.QueueImpl$SynchronizedIterator.next(QueueImpl.java:4367) ~[artemis-server-2.28.0.jar:2.28.0] at org.apache.activemq.artemis.core.server.impl.QueueImpl$SynchronizedIterator.next(QueueImpl.java:4335) ~[artemis-server-2.28.0.jar:2.28.0] at org.apache.activemq.artemis.core.protocol.mqtt.MQTTRetainMessageManager.addRetainedMessagesToQueue(MQTTRetainMessageManager.java:79) ~[artemis-mqtt-protocol-2.28.0.jar:2.28.0] at org.apache.activemq.artemis.core.protocol.mqtt.MQTTSubscriptionManager.addSubscription(MQTTSubscriptionManager.java:127) ~[artemis-mqtt-protocol-2.28.0.jar:2.28.0] at org.apache.activemq.artemis.core.protocol.mqtt.MQTTSubscriptionManager.addSubscriptions(MQTTSubscriptionManager.java:323) ~[artemis-mqtt-protocol-2.28.0.jar:2.28.0] at org.apache.activemq.artemis.core.protocol.mqtt.MQTTProtocolHandler.handleSubscribe(MQTTProtocolHandler.java:377) ~[artemis-mqtt-protocol-2.28.0.jar:2.28.0] at org.apache.activemq.artemis.core.protocol.mqtt.MQTTProtocolHandler.act(MQTTProtocolHandler.java:176) ~[artemis-mqtt-protocol-2.28.0.jar:2.28.0] at org.apache.activemq.artemis.utils.actors.Actor.doTask(Actor.java:32) ~[artemis-commons-2.28.0.jar:?] at org.apache.activemq.artemis.utils.actors.ProcessorBase.executePendingTasks(ProcessorBase.java:68) ~[artemis-commons-2.28.0.jar:?] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[?:?] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[?:?] at org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1.run(ActiveMQThreadFactory.java:118) ~[artemis-commons-2.28.0.jar:?] Thanks, Paul Shields
