Aurelijus Janeliunas [http://community.jboss.org/people/Leevoth] created the discussion "Deadlocks on blob/lob variables" To view the discussion, visit: http://community.jboss.org/message/589174#589174 -------------------------------------------------------------- Deadlocks occur in heavy load environment. I found some issues regarding deadlocks of this version Jbpm engine ( http://www.mail-archive.com/jboss-user@lists.jboss.org/msg177884.html http://www.mail-archive.com/jboss-user@lists.jboss.org/msg177884.html mailto://www.mail-archive.com/jboss-user@lists.jboss.org //www.mail-archive.com/jboss-user(a)lists.jboss.org/msg177884.html). I implemented custom DatabaseDbIdGenerator. This custom DbID generator selects values from Oracle sequence which is independent from transactions. But still we have problems regarding deadlocks on BlobVariable or Lob: 2011-02-08 09:58:35,890 WARN  [org.hibernate.util.JDBCExceptionReporter] (WorkManager(2)-72) SQL Error: 60, SQLState: 61000 2011-02-08 09:58:35,890 ERROR [org.hibernate.util.JDBCExceptionReporter] (WorkManager(2)-72) ORA-00060: deadlock detected while waiting for resource 2011-02-08 09:58:35,890 ERROR [org.hibernate.event.def.AbstractFlushingEventListener] (WorkManager(2)-72) Could not synchronize database state with session org.hibernate.exception.LockAcquisitionException: could not delete: [org.jbpm.pvm.internal.lob.Lob#10678725]     at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:110)     at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)     at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2569)     at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2725)     at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:97)     at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)     at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)     at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:172)     at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)     at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)     at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)     at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:365)     at org.hibernate.transaction.CacheSynchronization.beforeCompletion(CacheSynchronization.java:88)     at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:101)     at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:269)     at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:89)     at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:177)     at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1423)     at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:137)     at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:75)     at org.jboss.resource.adapter.jms.inflow.JmsServerSession$XATransactionDemarcationStrategy.end(JmsServerSession.java:657)     at org.jboss.resource.adapter.jms.inflow.JmsServerSession.run(JmsServerSession.java:243)     at org.jboss.resource.work.WorkWrapper.execute(WorkWrapper.java:205)     at org.jboss.util.threadpool.BasicTaskWrapper.run(BasicTaskWrapper.java:260)     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)     at java.lang.Thread.run(Thread.java:619) Caused by: java.sql.SQLException: ORA-00060: deadlock detected while waiting for resource     at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:70)     at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:112)     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:173)     at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:455)     at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:413)     at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:1030)     at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:194)     at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:947)     at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1222)     at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3381)     at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3462)     at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeUpdate(OraclePreparedStatementWrapper.java:1349)     at org.jboss.resource.adapter.jdbc.WrappedPreparedStatement.executeUpdate(WrappedPreparedStatement.java:365)     at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2551)     ... 24 more or this one org.hibernate.exception.LockAcquisitionException: could not update: [org.jbpm.pvm.internal.type.variable.BlobVariable#10613779] at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:110) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2453) at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:2335) at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2635) at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:115) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:168) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321) at org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:64) at org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:996) at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1589) at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:306) at org.hibernate.impl.CriteriaImpl.uniqueResult(CriteriaImpl.java:328) at org.jbpm.pvm.internal.hibernate.DbSessionImpl.findTaskByExecution(DbSessionImpl.java:311) at org.jbpm.jpdl.internal.activity.TaskActivity.signal(TaskActivity.java:130) at org.jbpm.jpdl.internal.activity.TaskActivity.signal(TaskActivity.java:116) at org.jbpm.pvm.internal.model.op.Signal.perform(Signal.java:70) at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:672) at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:632) at org.jbpm.pvm.internal.model.ExecutionImpl.signal(ExecutionImpl.java:430) at org.jbpm.pvm.internal.model.ExecutionImpl.signal(ExecutionImpl.java:416) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:197) at org.jbpm.pvm.internal.model.ExecutionImpl_$$_javassist_99.signal(ExecutionImpl_$$_javassist_99.java) at org.jbpm.pvm.internal.task.TaskImpl.complete(TaskImpl.java:201) at org.jbpm.pvm.internal.cmd.CompleteTaskCmd.execute(CompleteTaskCmd.java:65) at org.jbpm.pvm.internal.cmd.CompleteTaskCmd.execute(CompleteTaskCmd.java:32) at org.jbpm.pvm.internal.cmd.CompositeCmd.execute(CompositeCmd.java:42) at org.jbpm.pvm.internal.cmd.CompositeCmd.execute(CompositeCmd.java:34) at org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42) at org.jbpm.pvm.internal.tx.SpringCommandCallback.doInTransaction(SpringCommandCallback.java:45) at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130) -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/589174#589174] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]