I tested again using JBoss 1.4.1.BETA and I am getting numerous exceptions like this: Caused by: org.jboss.cache.optimistic.DataVersioningException: Attempting to apply data version of type class org.hibernate.cache.OptimisticTreeCache$NonLockingDataVersion to a node that already contains version of type class org.jboss.cache.optimistic.DefaultDataVersion at org.jboss.cache.interceptors.OptimisticValidatorInterceptor.simpleValidate(OptimisticValidatorInterceptor.java:144) at org.jboss.cache.interceptors.OptimisticValidatorInterceptor.validateNodes(OptimisticValidatorInterceptor.java:110) at org.jboss.cache.interceptors.OptimisticValidatorInterceptor.invoke(OptimisticValidatorInterceptor.java:75) at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68) at org.jboss.cache.interceptors.OptimisticLockingInterceptor.invoke(OptimisticLockingInterceptor.java:99) at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68) at org.jboss.cache.interceptors.OptimisticReplicationInterceptor.invoke(OptimisticReplicationInterceptor.java:85) at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68) at org.jboss.cache.interceptors.TxInterceptor.runPreparePhase(TxInterceptor.java:859) at org.jboss.cache.interceptors.TxInterceptor$LocalSynchronizationHandler.beforeCompletion(TxInterceptor.java:1124) ... 135 more View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3987246#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...