Single action timer is not triggered automatically after a DB outage, requires server restart --------------------------------------------------------------------------------------------- Key: WFLY-12457 URL: https://issues.jboss.org/browse/WFLY-12457 Project: WildFly Issue Type: Bug Components: EJB Reporter: Enrique González Martínez Assignee: Cheng Fang Priority: Major A timer is created with the {{timerService.createSingleActionTimer(..)}} method. When the database is down at the time this timer expires, the timer execution fails with the following ERROR: {noformat} 09:01:32,968 ERROR [org.jboss.as.ejb3.timer] (EJB timer-thread-pool - 4) WFLYEJB0502: Exception checking if timer [id=7ac2a79a-daa8-46fb-afa1-9e72f39a5b01 timedObjectId=ejb-timer-db-outage.ejb-timer-db-outage.TimeoutExample auto-timer?:false persistent?:true timerService=org.jboss.as.ejb3.timerservice.TimerServiceImpl@7071c87c initialExpiration=Fri Aug 09 09:01:32 MDT 2019 intervalDuration(in milli sec)=0 nextExpiration=Fri Aug 09 09:01:32 MDT 2019 timerState=ACTIVE info=timer_1565362882955_10000] should run: java.sql.SQLException: javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:jboss/datasources/ejb_timer at org.jboss.jca.adapters.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:159) at org.jboss.as.connector.subsystems.datasources.WildFlyDataSource.getConnection(WildFlyDataSource.java:64) at org.jboss.as.ejb3.timerservice.persistence.database.DatabaseTimerPersistence.shouldRun(DatabaseTimerPersistence.java:405) at org.jboss.as.ejb3.timerservice.TimerServiceImpl.shouldRun(TimerServiceImpl.java:1148) at org.jboss.as.ejb3.timerservice.TimerTask.run(TimerTask.java:133) at org.jboss.as.ejb3.timerservice.TimerServiceImpl$Task$1.run(TimerServiceImpl.java:1304) at org.wildfly.extension.requestcontroller.RequestController$QueuedTask$1.run(RequestController.java:494) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) at org.jboss.threads.JBossThread.run(JBossThread.java:485) Caused by: javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:jboss/datasources/ejb_timer at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:690) at org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl.getManagedConnection(TxConnectionManagerImpl.java:440) at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:789) at org.jboss.jca.adapters.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:151) ... 10 more {noformat} EXPECTATION: The timer should fire once the DB is accessible again. RESULT: The timer is not executed even after the DB connection has been restored. After a server restart, the timer is executed again. Note: This issue has originally been reported in the context of RHPAM as RHPAM-2180 where processes with timers get stuck after a DB outage. The relevant [jBPM code|https://github.com/kiegroup/jbpm/blob/master/jbpm-services/jbpm-serv...] calls {{timerService.createSingleActionTimer(..)}}.