Timer fails if transaction isolation set to SERIALIZABLE -------------------------------------------------------- Key: WFLY-8043 URL: https://issues.jboss.org/browse/WFLY-8043 Project: WildFly Issue Type: Bug Components: EJB Affects Versions: 8.2.0.Final, 10.0.0.Final Environment: Linux, JDK8, Oracle DB 11g Reporter: Wolf-Dieter Fink If the transaction isolation level is set to SERIALIZABLE if one node aquires the row lock via the UPDATE JBOSS_EJB_TIMER.. the other nodes throw an ORA-08177: can't serialize access for this transaction exception. The timer thats row threw the exception never runs any more, not even in case the other nodes were shut down. The serialization exception is also thrown upon server/application startup sometimes.