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    Deadlocks on blob/lob variables
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    created by <a href="http://community.jboss.org/people/Leevoth">Aurelijus Janeliunas</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/589174#589174">View the full discussion</a>
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<div class="jive-rendered-content"><p><span>Deadlocks occur in heavy load environment. I found some issues regarding deadlocks of this version Jbpm engine (</span><a class="jive-link-external-small" href="http://www.mail-archive.com/jboss-user@lists.jboss.org/msg177884.html" target="_blank">http://www.mail-archive.com/jboss-user@lists.jboss.org/msg177884.html</a><a class="jive-link-email-small" href="mailto://www.mail-archive.com/jboss-user@lists.jboss.org" target="_blank">//www.mail-archive.com/jboss-user@lists.jboss.org</a><span>/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:</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p><span style="color: #ff0000;">2011-02-08 09:58:35,890 WARN&#160; [org.hibernate.util.JDBCExceptionReporter] (WorkManager(2)-72) SQL Error: 60, SQLState: 61000</span></p><p><span style="color: #ff0000;">2011-02-08 09:58:35,890 ERROR [org.hibernate.util.JDBCExceptionReporter] (WorkManager(2)-72) ORA-00060: deadlock detected while waiting for resource</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p><span style="color: #ff0000;">2011-02-08 09:58:35,890 ERROR [org.hibernate.event.def.AbstractFlushingEventListener] (WorkManager(2)-72) Could not synchronize database state with session</span></p><p><span style="color: #ff0000;">org.hibernate.exception.LockAcquisitionException: could not delete: [org.jbpm.pvm.internal.lob.Lob#10678725]</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:110)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2569)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2725)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:97)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:172)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:365)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.hibernate.transaction.CacheSynchronization.beforeCompletion(CacheSynchronization.java:88)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:101)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:269)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:89)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:177)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1423)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:137)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:75)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.jboss.resource.adapter.jms.inflow.JmsServerSession$XATransactionDemarcationStrategy.end(JmsServerSession.java:657)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.jboss.resource.adapter.jms.inflow.JmsServerSession.run(JmsServerSession.java:243)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.jboss.resource.work.WorkWrapper.execute(WorkWrapper.java:205)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.jboss.util.threadpool.BasicTaskWrapper.run(BasicTaskWrapper.java:260)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at java.lang.Thread.run(Thread.java:619)</span></p><p><span style="color: #ff0000;">Caused by: java.sql.SQLException: ORA-00060: deadlock detected while waiting for resource</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p><span style="color: #ff0000;">&#160;&#160;&#160; at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:70)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:112)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:173)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:455)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:413)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:1030)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:194)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:947)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1222)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3381)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3462)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeUpdate(OraclePreparedStatementWrapper.java:1349)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.jboss.resource.adapter.jdbc.WrappedPreparedStatement.executeUpdate(WrappedPreparedStatement.java:365)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2551)</span></p><p><span style="color: #ff0000;">&#160;&#160;&#160; ... 24 more</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p>or this one</p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p><span style="color: #ff0000;">org.hibernate.exception.LockAcquisitionException: could not update: [org.jbpm.pvm.internal.type.variable.BlobVariable#10613779]</span></p><p><span style="color: #ff0000;"> at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:110)</span></p><p><span style="color: #ff0000;"> at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)</span></p><p><span style="color: #ff0000;"> at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2453)</span></p><p><span style="color: #ff0000;"> at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:2335)</span></p><p><span style="color: #ff0000;"> at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2635)</span></p><p><span style="color: #ff0000;"> at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:115)</span></p><p><span style="color: #ff0000;"> at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)</span></p><p><span style="color: #ff0000;"> at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)</span></p><p><span style="color: #ff0000;"> at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:168)</span></p><p><span style="color: #ff0000;"> at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)</span></p><p><span style="color: #ff0000;"> at org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:64)</span></p><p><span style="color: #ff0000;"> at org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:996)</span></p><p><span style="color: #ff0000;"> at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1589)</span></p><p><span style="color: #ff0000;"> at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:306)</span></p><p><span style="color: #ff0000;"> at org.hibernate.impl.CriteriaImpl.uniqueResult(CriteriaImpl.java:328)</span></p><p><span style="color: #ff0000;"> at org.jbpm.pvm.internal.hibernate.DbSessionImpl.findTaskByExecution(DbSessionImpl.java:311)</span></p><p><span style="color: #ff0000;"> at org.jbpm.jpdl.internal.activity.TaskActivity.signal(TaskActivity.java:130)</span></p><p><span style="color: #ff0000;"> at org.jbpm.jpdl.internal.activity.TaskActivity.signal(TaskActivity.java:116)</span></p><p><span style="color: #ff0000;"> at org.jbpm.pvm.internal.model.op.Signal.perform(Signal.java:70)</span></p><p><span style="color: #ff0000;"> at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:672)</span></p><p><span style="color: #ff0000;"> at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:632)</span></p><p><span style="color: #ff0000;"> at org.jbpm.pvm.internal.model.ExecutionImpl.signal(ExecutionImpl.java:430)</span></p><p><span style="color: #ff0000;"> at org.jbpm.pvm.internal.model.ExecutionImpl.signal(ExecutionImpl.java:416)</span></p><p><span style="color: #ff0000;"> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)</span></p><p><span style="color: #ff0000;"> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)</span></p><p><span style="color: #ff0000;"> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)</span></p><p><span style="color: #ff0000;"> at java.lang.reflect.Method.invoke(Method.java:597)</span></p><p><span style="color: #ff0000;"> at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:197)</span></p><p><span style="color: #ff0000;"> at org.jbpm.pvm.internal.model.ExecutionImpl_$$_javassist_99.signal(ExecutionImpl_$$_javassist_99.java)</span></p><p><span style="color: #ff0000;"> at org.jbpm.pvm.internal.task.TaskImpl.complete(TaskImpl.java:201)</span></p><p><span style="color: #ff0000;"> at org.jbpm.pvm.internal.cmd.CompleteTaskCmd.execute(CompleteTaskCmd.java:65)</span></p><p><span style="color: #ff0000;"> at org.jbpm.pvm.internal.cmd.CompleteTaskCmd.execute(CompleteTaskCmd.java:32)</span></p><p><span style="color: #ff0000;"> at org.jbpm.pvm.internal.cmd.CompositeCmd.execute(CompositeCmd.java:42)</span></p><p><span style="color: #ff0000;"> at org.jbpm.pvm.internal.cmd.CompositeCmd.execute(CompositeCmd.java:34)</span></p><p><span style="color: #ff0000;"> at org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42)</span></p><p><span style="color: #ff0000;"> at org.jbpm.pvm.internal.tx.SpringCommandCallback.doInTransaction(SpringCommandCallback.java:45)</span></p><p><span style="color: #ff0000;"> at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:130) </span></p><p><span style="color: #ff0000;"><br/></span></p></div>

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