I've 2 JBoss apps that communicate with a central broker app via JGroups. One app running on one host communicates, but the other app does not. I'm new to JBoss / JGroups (i'm a longtime C++ developer who recently inherited this codebase), so any help is appreciated. These are the errors I see in the log of the app that does not communicate:

2008-03-28 15:29:11,881 WARN [org.jgroups.protocols.pbcast.GMS] merge responses from subgroup coordinators <= 1 ([]). Cancelling merge

2008-03-28 15:29:11,881 ERROR [org.jgroups.protocols.pbcast.GMS] coords or merge_id == null

2008-03-28 16:44:30,180 ERROR [org.jgroups.protocols.pbcast.GMS] merge_id ([216.239.XXX.XXX:9900|1206745285182]) or this.merge_id (null) is null (sender=10.15.XXX.XXX:9900).

If someone would teach me how to fish, i'd appreciate it. This app used to communicate, but then the machine died and I had to install it on another, and ever since, the above messages have appeared in the log. What configuration attributes for JBoss / JGroups should I be looking at to solve this problem?

Regards,

John

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