[jira] [Created] (GEODE-7220) NPE in the logs on reconnect

["Dan Smith (Jira)" <ji...@apache.org>]

Dan Smith created GEODE-7220:
--------------------------------

             Summary: NPE in the logs on reconnect
                 Key: GEODE-7220
                 URL: https://issues.apache.org/jira/browse/GEODE-7220
             Project: Geode
          Issue Type: Bug
          Components: membership
            Reporter: Dan Smith


We saw a NullPointerException in the logs when a member reconnects, see below.

It looks like it is likely caused by this code in JGroupsMessenger.start(), which is setting the receiver to null for a window of time. Because myChannel here is the same channel that was created before the reconnect, this means it may be receiving messages at this time:

{code:java}
myChannel.setReceiver(null);      
jgroupsReceiver = new JGroupsReceiver();      
myChannel.setReceiver(jgroupsReceiver); 
{code}

{noformat}
java.lang.AssertionError: Suspicious strings were written to the log during this run.
Fix the strings or use IgnoredException.addIgnoredException to ignore.
-----------------------------------------------------------------------
Found suspect string in log4j at line 2233

[error 2019/09/19 17:14:01.998 GMT <unicast receiver,bbe9b1b57f4c-16062> tid=81] JGRP000027: failed passing message up
java.lang.NullPointerException
	at org.jgroups.JChannel.invokeCallback(JChannel.java:816)
	at org.jgroups.JChannel.up(JChannel.java:741)
	at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:1030)
	at org.jgroups.protocols.FRAG2.up(FRAG2.java:165)
	at org.jgroups.protocols.FlowControl.up(FlowControl.java:390)
	at org.jgroups.protocols.UNICAST3.up(UNICAST3.java:442)
	at org.apache.geode.distributed.internal.membership.gms.messenger.StatRecorder.up(StatRecorder.java:73)
	at org.apache.geode.distributed.internal.membership.gms.messenger.AddressManager.up(AddressManager.java:72)
	at org.jgroups.protocols.TP.passMessageUp(TP.java:1658)
	at org.jgroups.protocols.TP$SingleMessageHandler.run(TP.java:1876)
	at org.jgroups.util.DirectExecutor.execute(DirectExecutor.java:10)
	at org.jgroups.protocols.TP.handleSingleMessage(TP.java:1789)
	at org.jgroups.protocols.TP.receive(TP.java:1714)
	at org.apache.geode.distributed.internal.membership.gms.messenger.Transport.receive(Transport.java:152)
	at org.jgroups.protocols.UDP$PacketReceiver.run(UDP.java:701)
	at java.lang.Thread.run(Thread.java:748)

 {noformat}



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