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I am facing dealock in concurrent scenarios
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created by <a href="https://community.jboss.org/people/sachin.francis">Sachin Francis</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/778546#778546">View the full discussion</a>
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<div class="jive-rendered-content"><p>I am doing create and start of a process, with persistence enabled, in tomcat 7 and oracle DB.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I am doing the operation in 300 concurrent threads.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Randomly i get the following error.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Could someone help me in this?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Please find the trace below</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>63670 27/11 17:11:02,138[http-8080-Processor1236] ERROR drools.persistence.SingleSessionCommandService.rollbackTransaction  - Could not commit session<br/>java.lang.RuntimeException: Unable to commit transaction<br/> at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:182)<br/> at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:348)<br/> at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.startProcess(CommandBasedStatefulKnowledgeSession.java:223)<br/> at com.xxxxx.bpm.test.util.JBPMManager.createAndProcessWithSetVariable(JBPMManager.java:63)<br/> at org.apache.jsp.jsp.createProcess_jsp._jspService(createProcess_jsp.java:82)<br/> at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)<br/> at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)<br/> at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)<br/> at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)<br/> at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)<br/> at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)<br/> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)<br/> at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)<br/> at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)<br/> at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)<br/> at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)<br/> at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)<br/> at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)<br/> at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)<br/> at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)<br/> at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)<br/> at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)<br/> at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)<br/> at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)<br/> at java.lang.Thread.run(Thread.java:662)<br/>Caused by: javax.persistence.PersistenceException: org.hibernate.exception.LockAcquisitionException: Could not execute JDBC batch update<br/> at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:614)<br/> at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:513)<br/> at bitronix.tm.BitronixTransaction.fireBeforeCompletionEvent(BitronixTransaction.java:478)<br/> at bitronix.tm.BitronixTransaction.commit(BitronixTransaction.java:193)<br/> at bitronix.tm.BitronixTransactionManager.commit(BitronixTransactionManager.java:120)<br/> at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:179)<br/> ... 24 more<br/>Caused by: org.hibernate.exception.LockAcquisitionException: Could not execute JDBC batch update<br/> at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:110)<br/> at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)<br/> at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)<br/> at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:266)<br/> at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:167)<br/> at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)<br/> at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)<br/> at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1028)<br/> at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:366)<br/> at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:504)<br/> ... 28 more<br/>Caused by: java.sql.BatchUpdateException: ORA-00060: deadlock detected while waiting for resource</p><p> at oracle.jdbc.driver.DatabaseError.throwBatchUpdateException(DatabaseError.java:674)<br/> at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:9394)<br/> at oracle.jdbc.driver.OracleStatementWrapper.executeBatch(OracleStatementWrapper.java:211)<br/> at org.apache.tomcat.dbcp.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:294)<br/> at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)<br/> at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)<br/> ... 35 more</p></div>
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