NPE in mod_cluster stopping --------------------------- Key: WFLY-8119 URL: https://issues.jboss.org/browse/WFLY-8119 Project: WildFly Issue Type: Bug Components: mod_cluster Affects Versions: 10.1.0.Final Reporter: Radoslav Husar Assignee: Radoslav Husar Fix For: 11.0.0.Alpha1 Don't know what causing it or how to reproduce it. It started to show with EAP 7.1.0.DR10. At first glance it shows quite randomly without any significant effect on server {noformat} 2017-01-11 08:29:19,989 INFO [org.wildfly.extension.undertow] (MSC service thread 1-3) WFLYUT0004: Undertow 1.4.8.Final-redhat-1 stopping 2017-01-11 08:29:20,108 ERROR [org.jboss.mod_cluster.undertow] (UndertowEventHandlerAdapter - 1) null: java.lang.NullPointerException at org.jboss.modcluster.ModClusterService.connectionEstablished(ModClusterService.java:305) at org.jboss.modcluster.mcmp.impl.DefaultMCMPHandler.status(DefaultMCMPHandler.java:392) at org.jboss.modcluster.mcmp.impl.DefaultMCMPHandler.status(DefaultMCMPHandler.java:365) at org.jboss.modcluster.ModClusterService.status(ModClusterService.java:454) at org.wildfly.mod_cluster.undertow.UndertowEventHandlerAdapter.run(UndertowEventHandlerAdapter.java:179) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) 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) at org.jboss.threads.JBossThread.run(JBossThread.java:320) {noformat} http://paste.fedoraproject.org/530763/30767148/