The clustering seems to work okay in a local setting. But the CacheMarshaller200 class is in the jbosscache-core.jar (jbosscache-core.jar MANIFEST shows version 3.1.0.GA). Should it be in this jar? I am using the jar that came with JBoss AS 5.1.0. | jar -tvf jbosscache-core.jar | grep CacheMarshaller | 30170 Mon May 04 15:48:16 PDT 2009 org/jboss/cache/marshall/CacheMarshaller200.class | 1801 Mon May 04 15:48:16 PDT 2009 org/jboss/cache/marshall/CacheMarshaller210.class | 4274 Mon May 04 15:48:16 PDT 2009 org/jboss/cache/marshall/CacheMarshaller300.class | View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4246261#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...