You can experiment a bit to try to figure out what the problem attribute is. On your classpath you'd need to have jboss-ha-client.jar and jboss-ha-server-api.jar (found in $JBOSS_HOME/common/lib) as well as jboss-common-core.jar and jboss-logging-spi.jar (found in $JBOSS_HOME/lib). Then, in pseudo-code: | import org.jbossha.framework.server.*; | . | Object toTest = ... whatever attribute value you want to test | | SimpleCachableMarshelledValue mv = new SimpleCachableMarshalledValue(toTest); | mv.toByteArray(); // internally serializes toTest | mv.get(); // deserializes View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4261600#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...