Re: [javagroups-users] NAKACK messages fills JBoss logs after startup

[<cen...@ic...>]

> Which version of JGroups ? I cannot find this error message anywhere in 
> JGroups 2.8 or 2.4...

We are using JGroups 2.2.7

> No, this is not expected, maybe you have a multicast loop somewhere. Try 

> changing the -ttl parameter to 1

Had no effect on anything. It's obviously a loop at the receiver. Seems to 
perceive the response as a new message.

BR,
Cenk






cen...@ic... wrote:
> Hi All,
>
> I am configuring a third party application based on JBoss, using
> application clustering with JGroups.
> However I am experiencing errormessages in the server logs that I don't
> quite understand, as below:
>
> ==============
> :UpHandler
> (NAKACK):org.jgroups.protocols.pbcast.NAKACK:2009/11/04-14:08:20.416 
CET:
> message did not contain a list (LinkedList) of retransmitted messages:
> java.lang.IllegalArgumentException: java.io.IOException:
> java.lang.ArrayStoreException: org.jgroups.stack.IpAddress
> ==============

Which version of JGroups ? I cannot find this error message anywhere in 
JGroups 2.8 or 2.4...

> What does this message mean? Are the nodes not capable of communicating?
> We got three nodes on the same machine multicasting eachother.
>
> As for testing multicasting with org.jgroups.tests.McastReceiverTest and
> org.jgroups.tests.McastSenderTest, seems to work ok when starting up the
> sender first. Starting the sender last will instead give me an infinite
> loop of "Hello from bela" on the receiver side. Is this expected? Using
> different bind_addr does not make any difference in the application
> server.

No, this is not expected, maybe you have a multicast loop somewhere. Try 
changing the -ttl parameter to 1

> We are using Solaris 10 machines. Used to have 2 or more NICs, but tests
> with only one interface gives the same result.

-- 
Bela Ban
Lead JGroups / Clustering Team
JBoss





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