NPE in FindSubgroupsTask ------------------------ Key: JGRP-1861 URL: https://issues.jboss.org/browse/JGRP-1861 Project: JGroups Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 3.5 Reporter: Radim Vansa Assignee: Bela Ban Priority: Minor Fix For: 3.5 With JGroups 3.5.0.Beta9, when the node is starting, I see several NPEs: {code} 04:07:19,396 ERROR [org.jgroups.protocols.MERGE2] (Timer-3,edg-perf01-29005) FindSubgroupsTask failed java.lang.NullPointerException at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:1124) at org.jgroups.protocols.MERGE2$FindSubgroupsTask.fetchViews(MERGE2.java:430) at org.jgroups.protocols.MERGE2$FindSubgroupsTask._findAndNotify(MERGE2.java:376) at org.jgroups.protocols.MERGE2$FindSubgroupsTask.findAndNotify(MERGE2.java:361) at org.jgroups.protocols.MERGE2$1.run(MERGE2.java:266) at org.jgroups.util.TimeScheduler3$Task.run(TimeScheduler3.java:283) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:744) {code} These are probably harmless, later the cluster forms correctly.