Possible NullPointerException in RouterStubManager -------------------------------------------------- Key: JGRP-1892 URL: https://issues.jboss.org/browse/JGRP-1892 Project: JGroups Issue Type: Bug Affects Versions: 3.5.1 Reporter: Thomas Santosa Assignee: Bela Ban Fix For: 3.5.2, 3.6 Stack trace: {noformat} Okt 14, 2014 11:41:21 AM org.jgroups.stack.RouterStub SEVERE: failed notifying ConnectionListener org.jgroups.protocols.TUNNEL$b@104a305 java.lang.NullPointerException at java.util.concurrent.ConcurrentHashMap.putIfAbsent(Unknown Source) at org.jgroups.stack.RouterStubManager.startReconnecting(Katalis.java:131) at org.jgroups.stack.RouterStubManager.connectionStatusChange(Katalis.java:166) at org.jgroups.protocols.TUNNEL$b.connectionStatusChange(Katalis.java:168) at org.jgroups.stack.RouterStub.connectionStateChanged(Katalis.java:360) at org.jgroups.stack.RouterStub.checkConnection(Katalis.java:235) at org.jgroups.stack.RouterStubManager$2.run(Katalis.java:145) at org.jgroups.util.TimeScheduler3$Task.run(Katalis.java:283) at org.jgroups.util.TimeScheduler3$RecurringTask.run(Katalis.java:314) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) {noformat} RouterStubManager line 130-131: {code} f = timer.scheduleWithFixedDelay(reconnector, 0, interval, TimeUnit.MILLISECONDS); futures.putIfAbsent(stub, f); {code}