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