[jboss-jira] [JBoss JIRA] (JGRP-1434) ClassCastException with MPING

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-1434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12674061#comment-12674061 ] 

Bela Ban commented on JGRP-1434:
--------------------------------

OK, I see what happened. In the UDP config, mcast_port is 46655. In the TCP config, MPING is also configured to use 46655. Both UDP (in jgroups-udp.xml) and MPING (in jgroups-tcp.xml) use the same multicast address.

If you now run same TCP based instances, and some UDP based instances, MPING will receive traffic from the UDP based nodes, which of course it doesn't know how to parse !

This is a configuration error, and I suggest needs to be changed in Infinispan.
                
> ClassCastException with MPING
> -----------------------------
>
>                 Key: JGRP-1434
>                 URL: https://issues.jboss.org/browse/JGRP-1434
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 3.0.6
>            Reporter: Galder Zamarreño
>            Assignee: Bela Ban
>             Fix For: 3.0.7, 3.1
>
>
> That's running https://github.com/infinispan/infinispan/blob/master/core/src/main/resources/jgroups-tcp.xml
> {code}SEVERE: failed receiving packet (from /127.0.0.1:46655)
> java.lang.ClassCastException: org.jgroups.util.TopologyUUID cannot be cast to org.jgroups.Header
> 	at org.jgroups.Message.readHeader(Message.java:901)
> 	at org.jgroups.Message.readFrom(Message.java:785)
> 	at org.jgroups.protocols.MPING.run(MPING.java:329)
> 	at java.lang.Thread.run(Thread.java:680){code}

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