IndexOutOfBoundsException when trace logging -------------------------------------------- Key: JGRP-2085 URL: https://issues.jboss.org/browse/JGRP-2085 Project: JGroups Issue Type: Bug Affects Versions: 3.6.9 Reporter: Radim Vansa Assignee: Bela Ban Priority: Minor Fix For: 3.6.11 When running with trace logging, I got couple of these STs: {code} Exception in thread "OOB-1,test-NodeE-13479" java.lang.IndexOutOfBoundsException: Index: 4, Size: 2 at java.util.ArrayList.rangeCheck(ArrayList.java:653) at java.util.ArrayList.get(ArrayList.java:429) at org.jgroups.protocols.pbcast.NAKACK2.handleMessages(NAKACK2.java:868) at org.jgroups.protocols.pbcast.NAKACK2.up(NAKACK2.java:705) at org.jgroups.stack.Protocol.up(Protocol.java:425) at org.jgroups.protocols.TP.passBatchUp(TP.java:1600) at org.jgroups.protocols.TP$BatchHandler.run(TP.java:1820) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) {code} Seems that part of the list of received messages is removed in handleMessages:864 in {code} boolean added=loopback || buf.add(msgs, oob, oob? DUMMY_OOB_MSG : null); {code} But the {{size}} is not recomputed afterwards.