[jbosscache-users] Issue with JBC on Tomcat 5.5

Tue Nov 13 05:30:08 EST 2007

Hi Manik,

Thanks for your reply. 
Yes, the tomcat clustering is enabled and works fine. Does tomcat also
use JGroups ? 

The tomcat's clustering is on say 228.8.8.8 and port 4554. What I have
done is, configured replSync-service.xml that comes with JBossCache and
pointed the UDP/mcastaddr  to the same addr and port as in Tomcat. Is
there something wrong here ? What I have udnerstood from the documetns
of JBossCAche is that, it leverages on JGroups which is capable of
discovering an existing multicast group, in that case is'nt this
configuration enough ? If the answer is no then what is the role of
replSync-service.xml ? Is there a separate xml that is to be configured
for automatic discovery ? Or the mping.xml found in jgroups.jar has to
be modified ?

Have not found any information on configuring for automatic discovery in
the JBoss user guide. 

Best Regards,
Jigyaasa_Jbosscache

________________________________

From: Manik Surtani [mailto:manik at jboss.org] 
Sent: Monday, November 12, 2007 7:03 PM
To: Mamta, Jain
Cc: jbosscache-users at lists.jboss.org
Subject: Re: [jbosscache-users] Issue with JBC on Tomcat 5.5 

Have you enabled Tomcat clustering as well?  By the look of that stack
trace Tomcat clustering is enabled, and it may use a different version
of JGroups.  If you want to use TOmcat clustering as well, make sure
your multicast address and ports don't overlap.

http://wiki.jboss.org/wiki/Wiki.jsp?page=PromiscuousTraffic

On 12 Nov 2007, at 05:17, Mamta, Jain wrote:

	Hi All,

	We are having trouble using JBC Habanero version 2.0.0.0 GA for
enabling Distributed Caching. The error encountered as appearing in the
log is :

	Nov 2, 2007 6:00:07 AM org.jgroups.protocols.TP$IncomingPacket
run
	WARNING: packet from a.b.c.d:45564 has different version (0.0.0)
from ours (2.5.0). Packet is discarded

	Environment :
	Tomcat 5.5.20, Multicast
	Starting Catalina with the following option to avoid the
"Problem creating sockets" :
	    -Djava.net.preferIPv4Stack=true

	What I am trying to do is, use JBC for distributing cache over
the Tomcats cluster established with multicasting. The steps followed
were :

	    1. modified ip address & port for the UDP/mcastaddr and port
in replSync-service.xml
	    2. commented off transaction manager tag in the xml, as we
dont have the requirement for Transactional Caching
	    3. created a client that would enable/initialize the JBC
caching :

	        CacheFactory factory =
DefaultCacheFactory.getInstance();
	        cache = factory.createCache(<url of the
replSync-service.xml>);

	Whats happening is :

	    1. JGroups seems to be doing whats required as I see the
following in the log :

	        INFO: JGroups version: 2.5.0
	        -------------------------------------------------------
	        GMS: address is a.b.c.d:32838

	    2. And further the following is logged :

	    INFO: viewAccepted(): [a.b.c.d:32838|0] [a.b.c.d:32838]
	    Nov 2, 2007 6:00:06 AM org.jboss.cache.CacheImpl
internalStart
	    INFO: CacheImpl local address is a.b.c.d:32838
	    Nov 2, 2007 6:00:06 AM org.jboss.cache.CacheImpl
internalStart
	    INFO: JBoss Cache version: JBossCache 'Habanero' 2.0.0.GA[
$Id: Version.java,v 1.35 2007/08/01 16:52:13 msurtani Exp $]
	    Nov 2, 2007 6:00:07 AM
org.apache.catalina.cluster.mcast.McastServiceImpl$ReceiverThread run
	    WARNING: Error receiving mcast package. Sleeping 500ms
	        java.lang.ArrayIndexOutOfBoundsException
	         at java.lang.System.arraycopy(Native Method)
	         at
org.apache.catalina.cluster.mcast.McastMember.getMember(McastMember.java
:174)
	         at
org.apache.catalina.cluster.mcast.McastServiceImpl.receive(McastServiceI
mpl.java:210)
	         at
org.apache.catalina.cluster.mcast.McastServiceImpl$ReceiverThread.run(Mc
astServiceImpl.java:254)
	    Nov 2, 2007 6:00:07 AM
org.jgroups.protocols.TP$IncomingPacket run
	    WARNING: packet from a.b.c.d:45564 has different version
(0.0.0) from ours (2.5.0). Packet is discarded

	    3. Is the observed error ignorable ?
	    4. I have not started the other node in the cluster as there
are hundreds of lines appearing in the log with Packet discarded
message.

	Have I done enough, or missing something obvious as the
documents do direct us to do just the above.

	Best Regards,
	Jigyaasa_Jbosscache
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--
Manik Surtani
Lead, JBoss Cache
manik at jboss.org

This email is confidential. If you are not the addressee tell the sender immediately and destroy this email
without using, sending or storing it. Emails are not secure and may suffer errors, viruses, delay,
interception and amendment. Standard Chartered PLC and subsidiaries ("SCGroup") do not accept liability for
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