Further worked on this to resolve this cluster issue.

Followed jgroups manual link --> http://www.jgroups.org/manual/html/ch02.html

Interstingly when I tested whether the IP Multicast  is setup properly or not (point 2.8 in the article), it works fine. What ever I type in 'Sender' is coming to 'Receiver'(both are running in two different instances/jvm's).

But when I tested the 'Draw' demo java program (point 2.6 in the article), it gace me the same exception. Please find the below stack trace for the same.

> java -cp /home/jboss/jboss-5.1.1/lib/concurrent.jar:/home/jboss/jboss-5.1.1/server/DasMonitor/lib/jgroups.jar:/home/jboss/jboss-5.1.1/client/commons-logging.jar org.jgroups.demos.Draw
Nov 7, 2011 3:32:25 AM org.jgroups.JChannel init
INFO: JGroups version: 2.6.19.Final

---------------------------------------------------------
GMS: address is 127.0.0.2:44446 (cluster=DrawGroupDemo)
---------------------------------------------------------
Nov 7, 2011 3:32:25 AM org.jgroups.protocols.TP down
SEVERE: failed sending message to null (48 bytes)
java.lang.Exception: dest=/228.10.10.10:45588 (51 bytes)
        at org.jgroups.protocols.UDP._send(UDP.java:374)
        at org.jgroups.protocols.UDP.sendToAllMembers(UDP.java:302)
        at org.jgroups.protocols.TP.doSend(TP.java:1478)
        at org.jgroups.protocols.TP.send(TP.java:1468)
        at org.jgroups.protocols.TP.down(TP.java:1186)
        at org.jgroups.protocols.PING.sendMcastDiscoveryRequest(PING.java:278)
        at org.jgroups.protocols.PING.sendGetMembersRequest(PING.java:259)
        at org.jgroups.protocols.Discovery$PingSenderTask$1.run(Discovery.java:407)
        at org.jgroups.util.TimeScheduler$RobustRunnable.run(TimeScheduler.java:196)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.IOException: Invalid argument
        at java.net.PlainDatagramSocketImpl.send(Native Method)
        at java.net.DatagramSocket.send(DatagramSocket.java:625)
        at org.jgroups.protocols.UDP._send(UDP.java:

Thanks and Regards

Murali Reddy

One more test result.

Followed Testing JBoss link -->: http://community.jboss.org/docs/DOC-12375

Tested with 'jbm-control' jgroups stack. Got the similar exception.

~> java -cp /home/jboss/jboss-5.1.1/lib/concurrent.jar:/home/jboss/jboss-5.1.1/server/DasMonitor/lib/jgroups.jar:/home/jboss/jboss-5.1.1/client/commons-logging.jar  org.jgroups.demos.ViewDemo -props /home/jboss/jbm-control.xml

Nov 7, 2011 3:42:01 AM org.jgroups.JChannel init
INFO: JGroups version: 2.6.19.Final

---------------------------------------------------------
GMS: address is 127.0.0.2:55200 (cluster=ViewDemo)
---------------------------------------------------------
Nov 7, 2011 3:42:01 AM org.jgroups.protocols.TP down
SEVERE: failed sending message to null (43 bytes)
java.lang.Exception: dest=/228.11.11.11:45688 (46 bytes)
        at org.jgroups.protocols.UDP._send(UDP.java:374)
        at org.jgroups.protocols.UDP.sendToAllMembers(UDP.java:302)
        at org.jgroups.protocols.TP.doSend(TP.java:1478)
        at org.jgroups.protocols.TP.send(TP.java:1468)
        at org.jgroups.protocols.TP.down(TP.java:1186)
        at org.jgroups.protocols.TP$ProtocolAdapter.down(TP.java:2308)
        at org.jgroups.protocols.PING.sendMcastDiscoveryRequest(PING.java:278)
        at org.jgroups.protocols.PING.sendGetMembersRequest(PING.java:259)
        at org.jgroups.protocols.Discovery$PingSenderTask$1.run(Discovery.java:407)
        at org.jgroups.util.TimeScheduler$RobustRunnable.run(TimeScheduler.java:196)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.IOException: Invalid argument
        at java.net.PlainDatagramSocketImpl.send(Native Method)
        at java.net.DatagramSocket.send(DatagramSocket.java:625)
        at org.jgroups.protocols.UDP._send(UDP.java:358)
        ... 18 more
       

Thanks and Regards
Murali Reddy

Added 'jbm-control' jgroups stack configuration file.

Tested same test case(with jbm-control.xml) in SUSE 9 with out any issues. So guessing some fight between JBoss EAP 5.1.1 'jbm-control' jgroups stack with SUSE 11.

Thanks and Regards

Murali Reddy

Finally able to resolve(I am guessing) this issue.

Added "-Djava.net.preferIPv4Stack=true" for above tests. Also added same in JBoss start up script. This resolved the issue. Now cluster is working good.

Not sure what"-Djava.net.preferIPv4Stack=true" will do.

Thanks and Regards

Murali Reddy