[jboss-jira] [JBoss JIRA] Reopened: (JBAS-8626) QueuedPessimisticEJBLock is released too early

QueuedPessimisticEJBLock is released too early ---------------------------------------------- Key: JBAS-8626 URL: https://issues.jboss.org/browse/JBAS-8626 Project: Legacy JBoss Application Server 6 Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: JBossAS-3.2.7 Final, JBossAS-5.1.0.GA Reporter: Judith Bürgstein Fix For: No Release Attachments: bug-0.1-SNAPSHOT.jar, jboss_logfile.log, source.jar Usecase: All xx, xy, yy and xz are representing readonly entitybean-methods and are called on one EntityBean. CMT required and reentrant true. The following methods are executed on the server in this order: Thread1: calls entitybean.xx Thread1: calls entitybean.xy Thread2: calls entitybean.yy -> has to wait for the QueuedPessimisticEJBLock Thread1: returns from entitybean.xy and frees the QueuedPessimisticEJBLock <--- BUG Thread2: gets the QueuedPessimisticEJBLock but doesn't get the NonReentrantLock Thread1: calls entitybean.xz -> has to wait for the QueuedPessimisticEJBLock and still holds the NonReentrantLock Result: Undetected deadlock between QueuedPessimisticEJBLock and NonReentrantLock. Please use the attached bug-0.1-SNAPSHOT.jar for verification. Main class for the test is locking.bug.DeadlockTest. Our current workaround: Created a subclass of QueuedPessimisticEJBLock and override problematic method "endInvocation": public void endInvocation(Invocation P_mi) { Transaction F_tx = P_mi.getTransaction(); if (F_tx != null && F_tx.equals(getTransaction())) { EntityEnterpriseContext F_ctx = (EntityEnterpriseContext)P_mi.getEnterpriseContext(); if(F_ctx == null) { endTransaction(F_tx); } else if(F_ctx.hasTxSynchronization() == false) { NonReentrantLock F_mLock = F_ctx.getMethodLock(); if (F_mLock == null) { endTransaction(F_tx); } else { Object F_resourceHolder = F_mLock.getResourceHolder(); if (F_resourceHolder instanceof Thread && Thread.currentThread().equals(F_resourceHolder)) { // don't end the transaction, because we still own the // lock! } else if (F_resourceHolder instanceof Transaction && F_tx.equals(F_resourceHolder)) { // don't end the transaction, because we still own the // lock! } else { endTransaction(F_tx); } } } else { //hasTxSynchronization is true -> don't end the transaction } } }