Exception while executing SubProcess

[suchi1247]

Hi.,
Iam trying to executing the below program in which ProcessState node is used.

<process-definition
 xmlns="" name="MainProcess">
 <start-state name="start">
 <transition name="" to="state1"></transition>
 </start-state>
 <state name="state1">
 <transition name="" to="process1"></transition>
 </state>
 <end-state name="end1"></end-state>
 <process-state name="process1">
 <sub-process name="ChildProcess"></sub-process>
 <transition name="" to="end1"></transition>
 </process-state>
</process-definition>

And the childProcess is

<process-definition
 xmlns="" name="ChildProcess">
 <start-state name="start">
 <transition name="" to="ChildProcessState"></transition>
 </start-state>
 <state name="ChildProcessState">
 <event type="node-enter">
 <action name="Action" class="com.iton.handlers.ChildProcessAction"></action>
 </event>
 <transition name="" to="end1"></transition>
 </state>
 <end-state name="end1"></end-state>
</process-definition>

The Program which iam trying to Execute is

 JbpmConfiguration jbpmConfiguration =JbpmConfiguration.parseResource("hibernate.cfg");
 JbpmContext jbpmContext=jbpmConfiguration.createJbpmContext();
 try{
// parsing sub process
 ProcessDefinition subProcessDefinition = ProcessDefinition.parseXmlResource("ChildProcess/processdefinition.xml");
 System.out.println("Entered into Subproceess");
 jbpmContext.deployProcessDefinition(subProcessDefinition);
 System.out.println("subproceess Deployed ");
 ProcessDefinition processDefinition = ProcessDefinition.parseXmlResource("MainProcess/processdefinition.xml");
 System.out.println("Entered into Main Process");
 jbpmContext.deployProcessDefinition(processDefinition);
 System.out.println("Main proceess deployed");

 ProcessInstance subProcessInstance = subProcessDefinition.createProcessInstance();
 jbpmContext.save(subProcessInstance);
 System.out.println("subproceess saved ");
 //parsing parent process
 ProcessInstance processInstance = processDefinition.createProcessInstance();
 jbpmContext.save(processInstance);
 System.out.println("Main Process Saved");

 System.out.println(" a: "+ processInstance.getRootToken().getNode().getName());
 processInstance.signal();
 System.out.println(" b: "+ processInstance.getRootToken().getNode().getName());
 System.out.println("going to Process State now");
 processInstance.signal();
 }
 catch(Exception e)
 {e.printStackTrace();}
 finally{
 jbpmContext.close();
 }

But I found the following Exception while executing the above code.

14:25:15,057 WARN [JDBCExceptionReporter] SQL Error: 1, SQLState: 23000
14:25:15,057 ERROR [JDBCExceptionReporter] ORA-00001: unique constraint (JBPM.SYS_C007079) violate

14:25:15,057 WARN [JDBCExceptionReporter] SQL Error: 1, SQLState: 23000
14:25:15,057 ERROR [JDBCExceptionReporter] ORA-00001: unique constraint (JBPM.SYS_C007079) violate

14:25:15,057 ERROR [AbstractFlushingEventListener] Could not synchronize database state with sessi
org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
 at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71)
 at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
 at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:249)
 at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:92)
 at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:87)
 at org.hibernate.jdbc.AbstractBatcher.prepareBatchStatement(AbstractBatcher.java:218)
 at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.ja
 at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.ja
 at org.hibernate.action.EntityInsertAction.execute(EntityInsertAction.java:52)
 at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:232)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:139)
 at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushing
 at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java
 at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
 at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
 at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
 at org.jbpm.persistence.db.DbPersistenceService.commit(DbPersistenceService.java:253)
 at org.jbpm.persistence.db.DbPersistenceService.close(DbPersistenceService.java:211)
 at org.jbpm.svc.Services.close(Services.java:222)
 at org.jbpm.JbpmContext.close(JbpmContext.java:139)
 at com.iton.servlets.TestProcessState.doGet(TestProcessState.java:90)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173
 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.
 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.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.j
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
 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(Ht
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
 at java.lang.Thread.run(Thread.java:595)
Caused by: java.sql.BatchUpdateException: ORA-00001: unique constraint (JBPM.SYS_C007079) violated

 at oracle.jdbc.dbaccess.DBError.throwBatchUpdateException(DBError.java:441)
 at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:337
 at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:48)
 at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:242)
 ... 39 more

And I found that exceptiom is araised when it entered in to subprocess and the statements in childprocess action are printed on console.Also processdefinition and processinstances are saved in the db while executing.

Please Some one Help me to solve this Problem.

Thank you.

[mputz]

why do you explicitly create an instance of the sub-process?

[suchi1247]

Thank u Martin.I could able to solve that exception now.
but now iam getting NullPointerException.
Below is the modified code and Exception .

JbpmConfiguration jbpmConfiguration =JbpmConfiguration.parseResource("hibernate.cfg");
 JbpmContext jbpmContext=jbpmConfiguration.createJbpmContext();
 try{
// parsing sub process
 ProcessDefinition subProcessDefinition = ProcessDefinition.parseXmlResource("ChildProcess/processdefinition.xml");
 jbpmContext.deployProcessDefinition(subProcessDefinition);
 System.out.println("subproceess Deployed ");
 ProcessDefinition processDefinition = ProcessDefinition.parseXmlResource("MainProcess/processdefinition.xml");
 jbpmContext.deployProcessDefinition(processDefinition);
 System.out.println("Main proceess deployed");

 ProcessInstance processInstance = processDefinition.createProcessInstance();
 System.out.println(" a: "+ processInstance.getRootToken().getNode().getName());
 processInstance.signal();
 System.out.println(" b: "+ processInstance.getRootToken().getNode().getName());
 System.out.println("going to Process State now");
 processInstance.signal();
 System.out.println(" c: "+ processInstance.getRootToken().getNode().getName());
 System.out.println("reached to process State Now");


 System.out.println(" : "+ processInstance.getRootToken().getNode().getName());

 processInstance.signal();// i expect , signal to end node of main process here. but i got the below exception.
 System.out.println(" d: "+ processInstance.getRootToken().getNode().getName());

 }
 catch(Exception e)
 {e.printStackTrace();}
 finally{
 jbpmContext.close();
 }

And the exception is

 java.lang.NullPointerException
 at org.jbpm.graph.node.ProcessState.leave(ProcessState.java:197)
 at org.jbpm.graph.exe.Token.signal(Token.java:194)
 at org.jbpm.graph.exe.Token.signal(Token.java:139)
 at org.jbpm.graph.exe.ProcessInstance.signal(ProcessInstance.java:251)
 at com.iton.servlets.TestProcessState.doGet(TestProcessState.java:110)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 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.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
 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.ja

 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
 at java.lang.Thread.run(Thread.java:595)

Plz tell me whats wrong in my code??

[jkva]

I'm having the same problem. Does somebody have a solution for this problem?

Apart from some names, my process definition looks the same as the one posted above.

[jkva]

"jkva" wrote:
I'm having the same problem. Does somebody have a solution for this problem?

Apart from some names, my process definition looks the same as the one posted above.

With problem, I mean the NullPointerException.

[jkva]

I've found a possible solution for the NPE. I don't think it's a best practice, but at the moment it works.

The fix is manually creating an instance of the sub process and then manually creating a token, like in the following snippet.

token.signal();
ProcessInstance subProcessInstance = token.createSubProcessInstance(subProcessDefinition);
Token subToken = subProcessInstance.getRootToken();
subToken.signal();
subToken.signal();

However, it doesn't feel that good actually. It looks like I'm doing jBPM's job.