JCA recovery race condition --------------------------- Key: JBTM-1354 URL: https://issues.jboss.org/browse/JBTM-1354 Project: JBoss Transaction Manager Issue Type: Bug Security Level: Public(Everyone can see) Components: JCA, JTA, Recovery Reporter: Tom Jenkinson Assignee: Tom Jenkinson Fix For: 4.17.4, 5.0.0.M2 Evidenced in SimpleIsolatedServers::testSimultaneousRecovery Basically XATerminatorImple -> SAA::activate() -> XAResourceRecord::restore_state() -> getNewXAResource() -> XARecoveryModule::getNewXAResource() At this point _xidScans may be none-null but still only partial from the first scan: periodicWorkSecondPass -> bottomUpRecovery -> resourceInitiatedRecoveryForRecoveryHelpers -> xaRecovery if (_xidScans == null) _xidScans = new Hashtable<XAResource,RecoveryXids>(); What I am not sure of is whether we should synchronize bottomUpRecovery and getNewXAResource as that would stop this race condition. Gonna give that a whirl.