[jboss-jira] [JBoss JIRA] (JGRP-2261) NPE in FD_ALL2

NPE in FD_ALL2 -------------- Key: JGRP-2261 URL: https://issues.jboss.org/browse/JGRP-2261 Project: JGroups Issue Type: Bug Affects Versions: 4.0.10 Environment: WildFly 12.0.0.Final Reporter: Rich DiCroce Assignee: Bela Ban Fix For: 4.0.12 I'm seeing a NPE in FD_ALL2 from time to time. Not consistent but the reason isn't hard to see. Stack trace: {code} 16:08:06,244 ERROR [stderr] (thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)) Exception in thread "thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)" java.lang.NullPointerException 16:08:06,244 ERROR [stderr] (thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)) at org.jgroups.protocols.FD_ALL2.lambda$new$0(FD_ALL2.java:83) 16:08:06,245 ERROR [stderr] (thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)) at org.jgroups.util.MessageBatch.replaceIf(MessageBatch.java:220) 16:08:06,245 ERROR [stderr] (thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)) at org.jgroups.protocols.FD_ALL2.up(FD_ALL2.java:186) 16:08:06,245 ERROR [stderr] (thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)) at org.jgroups.stack.Protocol.up(Protocol.java:372) 16:08:06,245 ERROR [stderr] (thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)) at org.jgroups.stack.Protocol.up(Protocol.java:372) 16:08:06,246 ERROR [stderr] (thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)) at org.jgroups.stack.Protocol.up(Protocol.java:372) 16:08:06,246 ERROR [stderr] (thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)) at org.jgroups.protocols.TP.passBatchUp(TP.java:1274) 16:08:06,246 ERROR [stderr] (thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)) at org.jgroups.util.SubmitToThreadPool$BatchHandler.passBatchUp(SubmitToThreadPool.java:140) 16:08:06,246 ERROR [stderr] (thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)) at org.jgroups.util.SubmitToThreadPool$BatchHandler.run(SubmitToThreadPool.java:136) 16:08:06,246 ERROR [stderr] (thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 16:08:06,246 ERROR [stderr] (thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 16:08:06,247 ERROR [stderr] (thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)) at org.jboss.as.clustering.jgroups.ClassLoaderThreadFactory.lambda$newThread$0(ClassLoaderThreadFactory.java:52) 16:08:06,247 ERROR [stderr] (thread-10,ee,RCD_GP (flags=0), site-id=DEFAULT, rack-id=null, machine-id=null)) at java.lang.Thread.run(Thread.java:748) {code} HAS_HEADER is assuming msg is non-null, but MessageBatch makes it clear that it's valid for elements of the batch to be null, and replaceIf() doesn't perform a null check.