[jboss-jira] [JBoss JIRA] (JGRP-1465) [org.jgroups.protocols.TCP] failed sending message to NJ-WKST-2CF6D2X-62641 (91 bytes): java.lang.NullPointerException, cause: null

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12697093#comment-12697093 ] 

Bela Ban commented on JGRP-1465:
--------------------------------

This happens when we get a discovery request (received by the MPING multicast socket) before the channel is fully initialized. This is possible because MPING.start() (which creates and listens on the multicast socket) is called before TCP.start (which creates the ConnectionMap).
I fixed this by checking for a non-null connection map before sending a message.
                
> [org.jgroups.protocols.TCP] failed sending message to NJ-WKST-2CF6D2X-62641 (91 bytes): java.lang.NullPointerException, cause: null
> -----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: JGRP-1465
>                 URL: https://issues.jboss.org/browse/JGRP-1465
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 3.0.10
>         Environment: TCP + MPING
>            Reporter: freeliuade freeliuade
>            Assignee: Bela Ban
>            Priority: Minor
>             Fix For: 3.0.11, 3.1
>
>
> using TCP + MPING, on connect a channel, throws following error:
> ------------
> 2012-05-16 12:20:16,604 ERROR [org.jgroups.protocols.TCP] failed sending message to NJ-WKST-2CF6D2X-62641 (91 bytes): java.lang.NullPointerException, cause: null
> ------------
> using debug to get the exception detail as below:
> 2012-05-16 16:05:39,690 ERROR [STDERR] java.lang.NullPointerException
> 2012-05-16 16:05:39,690 ERROR [STDERR] 	at org.jgroups.protocols.TCP.send(TCP.java:56)
> 2012-05-16 16:05:39,690 ERROR [STDERR] 	at org.jgroups.protocols.BasicTCP.sendUnicast(BasicTCP.java:95)
> 2012-05-16 16:05:39,690 ERROR [STDERR] 	at org.jgroups.protocols.TP.sendToSingleMember(TP.java:1214)
> 2012-05-16 16:05:39,690 ERROR [STDERR] 	at org.jgroups.protocols.TP.doSend(TP.java:1198)
> 2012-05-16 16:05:39,690 ERROR [STDERR] 	at org.jgroups.protocols.TP.send(TP.java:1184)
> 2012-05-16 16:05:39,690 ERROR [STDERR] 	at org.jgroups.protocols.TP.down(TP.java:1041)
> 2012-05-16 16:05:39,690 ERROR [STDERR] 	at org.jgroups.protocols.Discovery.sendDiscoveryResponse(Discovery.java:512)
> 2012-05-16 16:05:39,690 ERROR [STDERR] 	at org.jgroups.protocols.Discovery.up(Discovery.java:347)
> 2012-05-16 16:05:39,690 ERROR [STDERR] 	at org.jgroups.protocols.PING.up(PING.java:69)
> 2012-05-16 16:05:39,690 ERROR [STDERR] 	at org.jgroups.protocols.MPING.up(MPING.java:176)
> 2012-05-16 16:05:39,690 ERROR [STDERR] 	at org.jgroups.protocols.MPING.run(MPING.java:327)
> 2012-05-16 16:05:39,690 ERROR [STDERR] 	at java.lang.Thread.run(Thread.java:662)
> and it should caused by MPING received a message, but the jchannel initialize doesn't done at this time. (TCPConnectionMap(ct) doesn't initialized in TCP). 
> I guess this error should be harmless, but I think MPING should receive message after jchannel initialze done. 

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