It looks like the cache process actually hung. During the step to select the data from DFM, there was an error and the whole process just hung. I see multiple attempts to complete but never see it get past that point.
2012-07-29 07:55:21,443 PDT WARN [com.arjuna.ats.jta.logging.loggerI18N] (WorkManager(2)-18) [com.arjuna.ats.internal.jta.transaction.arjunacore.lastResource.disallow] [com.arjuna.ats.internal.jta.transaction.arjunacore.lastResource.disallow] Adding multiple last resources is disallowed. Current resource is org.jboss.resource.connectionmanager.TxConnectionManager$LocalXAResource@43c709
2012-07-29 07:55:21,443 PDT WARN [org.hibernate.util.JDBCExceptionReporter] (WorkManager(2)-18) SQL Error: 0, SQLState: null
2012-07-29 07:55:21,443 PDT ERROR [org.hibernate.util.JDBCExceptionReporter] (WorkManager(2)-18) Could not enlist in transaction on entering meta-aware object!; - nested throwable: (javax.transaction.SystemException: java.lang.Throwable: Unabled to enlist resource, see the previous warnings. tx=TransactionImple < ac, BasicAction: a838c15:f5cb:4fc391e8:b9a31d status: ActionStatus.ABORT_ONLY >); - nested throwable: (org.jboss.resource.JBossResourceException: Could not enlist in transaction on entering meta-aware object!; - nested throwable: (javax.transaction.SystemException: java.lang.Throwable: Unabled to enlist resource, see the previous warnings. tx=TransactionImple < ac, BasicAction: a838c15:f5cb:4fc391e8:b9a31d status: ActionStatus.ABORT_ONLY >))
2012-07-29 07:55:21,490 PDT ERROR [org.jboss.aspects.tx.TxPolicy] (WorkManager(2)-18) javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Cannot open connection
2012-07-29 07:55:21,490 PDT ERROR [org.jboss.resource.adapter.jms.inflow.JmsServerSession] (WorkManager(2)-18) Unexpected error delivering message delegator->JBossMessage[22013111733039424]:PERSISTENT, deliveryId=11217
javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Cannot open connection