Hi,

  Greetings. Hope you are doing well! We are on containarised deployments and recently observed that ADM nodes are getting restarted with NullPointerException when communicating with HazelCast Clustering Service, please see below the exception.

Couldn't connect to the service, [1] retrying in 1 seconds... heartbeat","@version":1,"tenantid":"","logger_name":"com.pega.platform.serviceregistry.internal.database.tasks.TopologyChangedDetector"} {"exception":{"stacktrace":"java.lang.NullPointerException\n\tat com.pega.decision.adm.service.ADMService.handleMessage(ADMService.java:684)\n\tat com.pega.dsm.dnode.api.prpc.service.AbstractDsmService.handleMessageInternal(AbstractDsmService.java:175)\n\tat com.pega.dsm.dnode.impl.prpc.service.PostMessageJob$PostMessageJobData.handleMessage(PostMessageJob.java:87)\n\tat com.pega.dsm.dnode.impl.prpc.service.RegistryBasedDeployment.lambda$new$0(RegistryBasedDeployment.java:116)\n\tat com.pega.platform.messaging.internal.hazelcastv5.HazelcastTopic.lambda$null$1(HazelcastTopic.java:58)\n\tat com.pega.hazelcast.v5.client.impl.proxy.ClientTopicProxy$TopicItemHandler.handleTopicEvent(ClientTopicProxy.java:132)\n\tat com.pega.hazelcast.v5.client.impl.protocol.codec.TopicAddMessageListenerCodec$AbstractEventHandler.handle(TopicAddMessageListenerCodec.java:139)\n\tat com.pega.hazelcast.v5.client.impl.proxy.ClientTopicProxy$TopicItemHandler.handle(ClientTopicProxy.java:120)\n\tat com.pega.hazelcast.v5.client.impl.spi.impl.listener.ClientListenerServiceImpl.handleEventMessageOnCallingThread(ClientListenerServiceImpl.java:190)\n\tat com.pega.hazelcast.v5.client.impl.spi.impl.listener.ClientListenerServiceImpl$ClientEventProcessor.run(ClientListenerServiceImpl.java:361)\n\tat com.pega.hazelcast.v5.internal.util.executor.StripedExecutor$Worker.process(StripedExecutor.java:245)\n\tat com.pega.hazelcast.v5.internal.util.executor.StripedExecutor$Worker.run(StripedExecutor.java:228)\n","exception_class":"java.lang.NullPointerException"},"app":"","stack":"","source_host":"umb2cprdpega8-pega-adm-5dc8475d7d-hwpwf","level":"FATAL","appender_ref":"CLUSTER","message":"hz.client_1 [prpchz] [5.1.5] hz.client_1.event-1 caught an exception while processing:com.pega.hazelcast.v5.client.impl.spi.impl.listener.ClientListenerServiceImpl$ClientEventProcessor@ Any ideas on what is causing this issue? Regards,

Bharat