I get the following exception when clustering jboss portal on two nodes: I only extract first few lines of each exception here. Could someone please help me solve this? I suspected that it is a JBoss Cache configuration issue. 09:55:53,804 WARN [arjLoggerI18N] [com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator_2] TwoPhaseCoordinator.beforeCompletion - failed for com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple@503e4b java.lang.RuntimeException: Caused by: org.jboss.cache.lock.TimeoutException: failure acquiring lock: fqn=/, caller=GlobalTransaction:<10.0.0.98:34750>:47748, lock=write owner=GlobalTransaction:<10.0.0.98:34750>:47746 (activeReaders=0, activeWriter=Thread[ajp-10.0.0.98-8009-19,5,jboss], waitingReaders=0, waitingWriters=0, waitingUpgrader=0) at org.jboss.cache.Node.acquire(Node.java:500) Caused by: org.jboss.cache.lock.TimeoutException: write lock for / could not be acquired after 15000 ms. Locks: Read lock owners: [] Write lock owner: GlobalTransaction:<10.0.0.98:34750>:47746 (caller=GlobalTransaction:<10.0.0.98:34750>:47748, lock info: write owner=GlobalTransaction:<10.0.0.98:34750>:47746 (activeReaders=0, activeWriter=Thread[ajp-10.0.0.98-8009-19,5,jboss], waitingReaders=0, waitingWriters=0, waitingUpgrader=0)) at org.jboss.cache.lock.IdentityLock.acquireWriteLock(IdentityLock.java:206) at org.jboss.cache.Node.acquireWriteLock(Node.java:529) at org.jboss.cache.Node.acquire(Node.java:476) 09:55:53,807 WARN [TreeCache] replication failure with method_call optimisticPrepare; id:18(GlobalTransaction:<10.0.0.103:34547>:15349, [_put; id:38(GlobalTransaction:<10.0.0.103:34547>:15349, /org/jboss/portal/core/impl/model/portal/ObjectNodeSecurityConstraint/actions/org.jboss.portal.core.impl.model.portal.ObjectNodeSecurityConstraint.actions#1059, item, CollectionCacheEntry[viewrecursive], true, org.hibernate.cache.OptimisticTreeCache$NonLockingDataVersion@1fe76c6)], null, 10.0.0.103:34547, false) exception Caused by: org.jboss.cache.lock.TimeoutException: write lock for /org/jboss/portal/core/impl/model/portal/ObjectNodeSecurityConstraint/actions could not be acquired after 15000 ms. Locks: Read lock owners: [] 09:55:53,807 WARN [TxInterceptor] Rolling back, exception encountered javax.transaction.RollbackException: [com.arjuna.ats.internal.jta.transaction.arjunacore.commitwhenaborted] [com.arjuna.ats.internal.jta.transaction.arjunacore.commitwhenaborted] Can't commit because the transaction is in aborted state View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4178765#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...