This DOESN'T happen under load - I am the only person using the system (its in development on my local PC running XP). Here is a bit more of the log: 2006-08-22 16:03:09,421 DEBUG [com.msxi.warrantySystem.ejb.dao.GenericHibernateDAO] getting com.msxi.warrantySystem.ejb.entities.AuditType instance with id: 1 2006-08-22 16:03:09,421 DEBUG [org.jboss.cache.interceptors.OptimisticNodeInterceptor] unable to find node /com/msxi/warrantySystem/ejb/entities/AuditType/com.msxi.warrantySystem.ejb.entities.AuditType#1 in workspace. 2006-08-22 16:03:09,421 DEBUG [org.jboss.cache.interceptors.OptimisticNodeInterceptor] unable to find node /com/msxi/warrantySystem/ejb/entities/AuditType/com.msxi.warrantySystem.ejb.entities.AuditType#1 in workspace. 2006-08-22 16:03:09,421 INFO [org.jboss.cache.interceptors.OptimisticNodeInterceptor] Cannot Handle Method _put(GlobalTransaction::166, /com/msxi/warrantySystem/ejb/entities/AuditType/com.msxi.warrantySystem.ejb.entities.AuditType#1, item, CacheEntry(com.msxi.warrantySystem.ejb.entities.AuditType)[THIRD PARTY,An audit conducted by a third party], true, 0) 2006-08-22 16:03:09,421 DEBUG [org.jboss.cache.interceptors.OptimisticNodeInterceptor] Adding Method _put(GlobalTransaction::166, /com/msxi/warrantySystem/ejb/entities/AuditType/com.msxi.warrantySystem.ejb.entities.AuditType#1, item, CacheEntry(com.msxi.warrantySystem.ejb.entities.AuditType)[THIRD PARTY,An audit conducted by a third party], true, 0) to modification list 2006-08-22 16:03:09,437 DEBUG [com.msxi.warrantySystem.ejb.dao.GenericHibernateDAO] get successful, instance found All the other log output is my own output. We use the bundled hibernate: 3.2.0.cr2. This deployed as a HAR and is configured to use the tree cache availble in JNDI like so: | <attribute name="CacheProviderClass">org.jboss.hibernate.cache.DeployedTreeCacheProvider</attribute> | <attribute name="DeployedTreeCacheObjectName">jboss.cache:service=HibernateTreeCache</attribute> | | The tree cache mbean is configured like so: | <server> | <classpath codebase="./lib" archives="jboss-cache.jar, jgroups.jar"/> | <mbean code="org.jboss.cache.TreeCache" name="jboss.cache:service=HibernateTreeCache"> | <depends>jboss:service=Naming</depends> | <depends>jboss:service=TransactionManager</depends> | <attribute name="TransactionManagerLookupClass">org.jboss.cache.GenericTransactionManagerLookup</attribute> | <attribute name="NodeLockingScheme">OPTIMISTIC</attribute> | <attribute name="IsolationLevel">REPEATABLE_READ</attribute> | <attribute name="CacheMode">LOCAL</attribute> | <attribute name="UseReplQueue">false</attribute> | <attribute name="ReplQueueInterval">0</attribute> | <attribute name="ReplQueueMaxElements">0</attribute> | <attribute name="ClusterName">TreeCache-Cluster</attribute> | <attribute name="ClusterConfig"> | <config> | <UDP mcast_addr="228.1.2.3" mcast_port="48866" ip_ttl="64" ip_mcast="true" mcast_send_buf_size="150000" | mcast_recv_buf_size="80000" ucast_send_buf_size="150000" ucast_recv_buf_size="80000" loopback="true"/> | <PING timeout="2000" num_initial_members="3" up_thread="false" down_thread="false"/> | <MERGE2 min_interval="10000" max_interval="20000"/> | <!-- <FD shun="true" up_thread="true" down_thread="true" />--> | <FD_SOCK/> | <VERIFY_SUSPECT timeout="1500" up_thread="false" down_thread="false"/> | <pbcast.NAKACK gc_lag="50" retransmit_timeout="600,1200,2400,4800" max_xmit_size="8192" up_thread="false" down_thread="false"/> | <UNICAST timeout="600,1200,2400" window_size="100" min_threshold="10" down_thread="false"/> | <pbcast.STABLE desired_avg_gossip="20000" up_thread="false" down_thread="false"/> | <FRAG frag_size="8192" down_thread="false" up_thread="false"/> | <pbcast.GMS join_timeout="5000" join_retry_timeout="2000" shun="true" print_local_addr="true"/> | <pbcast.STATE_TRANSFER up_thread="true" down_thread="true"/> | </config> | </attribute> | <attribute name="FetchInMemoryState">false</attribute> | <attribute name="SyncReplTimeout">20000</attribute> | <attribute name="LockAcquisitionTimeout">15000</attribute> | <attribute name="InitialStateRetrievalTimeout">20000</attribute> | <attribute name="EvictionPolicyClass"/> | <attribute name="UseRegionBasedMarshalling">false</attribute> | </mbean> | </server> | | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3966731#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...