TimerImpl should set ACTIVE state before scheduling to avoid race condition --------------------------------------------------------------------------- Key: JBAS-6874 URL: https://jira.jboss.org/jira/browse/JBAS-6874 Project: JBoss Application Server Issue Type: Bug Security Level: Public (Everyone can see) Components: Scheduling/Timers Affects Versions: JBossAS-5.1.0.CR1, JBossAS-5.1.0.Beta1, JBossAS-5.0.1.GA, JBossAS-5.0.0.GA, JBossAS-4.2.3.GA, JBossAS-4.2.2.GA, JBossAS-4.2.1.GA, JBossAS-4.2.0.GA, JBossAS-4.0.5.GA Reporter: Galder Zamarreño Assignee: Galder Zamarreño Fix For: JBossAS-5.1.0.GA, JBossAS-6.0.0.Alpha1 Attachments: server.log TimerImpl sets ACTIVE state after it's scheduled the timer task which means that you can have a race condition leading to something like this: 2009-04-28 18:55:03,370 45084 DEBUG [org.jboss.ejb.txtimer.TimerImpl] (ScannerThread:) setTimerState: created 2009-04-28 18:55:03,372 45086 DEBUG [org.jboss.ejb.txtimer.TimerImpl] (EJB-Timer-2[target=jboss.j2ee:service=EJB3,jar=acme-ejb3.jar,name=ProblematicTimerManagerProxyBean]:) run: [id=2,target=[target=jboss.j2ee:service=EJB3,jar=acme-ejb3.jar,name=ProblematicTimerManagerProxyBean],remaining=-438372,periode=0,created] 2009-04-28 18:55:03,372 45086 DEBUG [org.jboss.ejb.txtimer.TimerImpl] (EJB-Timer-2[target=jboss.j2ee:service=EJB3,jar=acme-ejb3.jar,name=ProblematicTimerManagerProxyBean]:) setTimerState: in_timeout 2009-04-28 18:55:03,372 45086 DEBUG [org.jboss.ejb.txtimer.TimerImpl] (ScannerThread:) setTimerState: active Sometimes, the timer can kick off even before it's timer state has been set to active, which means that active state will be set after in_timeout. What's the effect of this? After the timer has executed, this means that the finally clause in TimerTaskImpl.run() won't be executed and hence, the timer won't be deleted from the database. This leads to multiple timer executions. Please find attached a thread dump where you can see EJB-Timer-1 being executed correctly, including removal from database, but EJB-Timer-2 is not. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: https://jira.jboss.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira