process disconnected exception after accsessing process variable

[jayzay212]

Hey everyone,

i am running jbpm 6.2 final with persistence in an osgi environment and i want to access a process variable in a running flow. After some search i found this code snippet to change a variables' value:

WorkflowProcessInstance processInstance = (WorkflowProcessInstance) ksession.getProcessInstance(processid);

processInstance.setVariable(variablename, value);

But everytime i try to set a new value i get a runtime exception:

java.lang.RuntimeException: Process instance 1[com.sample.bpmn] is disconnected.

    at org.jbpm.process.instance.impl.ProcessInstanceImpl.getProcess(ProcessInstanceImpl.java:100)

    at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.setVariable(WorkflowProcessInstanceImpl.java:284)

    at de.cjt.estuss.core.jbpm.impl.ProcessManager.setSpecificProcessVariable(ProcessManager.java:419)

    at de.cjt.estuss.vacation.jbpm.uiprovider.VacationObservingTaskDialog.completeTask(VacationObservingTaskDialog.java:217)

    at de.cjt.estuss.vacation.jbpm.uiprovider.VacationObservingTaskDialog.accept(VacationObservingTaskDialog.java:171)

    at de.cjt.estuss.vacation.jbpm.uiprovider.VacationObservingTaskDialog.acceptPressed(VacationObservingTaskDialog.java:244)

    at de.cjt.estuss.vacation.jbpm.uiprovider.VacationObservingTaskDialog.access$2(VacationObservingTaskDialog.java:243)

    at de.cjt.estuss.vacation.jbpm.uiprovider.VacationObservingTaskDialog$2.handleEvent(VacationObservingTaskDialog.java:305)

    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)

    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:700)

    at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:602)

    at org.eclipse.swt.widgets.Display.executeNextEvent(Display.java:1212)

    at org.eclipse.swt.widgets.Display.runPendingMessages(Display.java:1193)

    at org.eclipse.swt.widgets.Display.safeReadAndDispatch(Display.java:1176)

    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:1168)

    at org.eclipse.jface.window.Window.runEventLoop(Window.java:857)

    at org.eclipse.jface.window.Window.open(Window.java:833)

    at de.cjt.estuss.vacation.jbpm.uiprovider.VacationObservingTask.action(VacationObservingTask.java:36)

    at de.cjt.estuss.core.ui.home.TaskOverview$ActionSelectionListener.widgetSelected(TaskOverview.java:146)

    at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:262)

    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)

    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:700)

    at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:602)

    at org.eclipse.swt.widgets.Display.executeNextEvent(Display.java:1212)

    at org.eclipse.swt.widgets.Display.runPendingMessages(Display.java:1193)

    at org.eclipse.swt.widgets.Display.safeReadAndDispatch(Display.java:1176)

    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:1168)

    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1136)

    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)

    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1017)

    at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:148)

    at org.eclipse.rap.e4.E4EntryPointFactory.createWorkbench(E4EntryPointFactory.java:86)

    at org.eclipse.rap.e4.E4EntryPointFactory.access$0(E4EntryPointFactory.java:60)

    at org.eclipse.rap.e4.E4EntryPointFactory$1.createUI(E4EntryPointFactory.java:51)

    at org.eclipse.rap.rwt.internal.lifecycle.RWTLifeCycle.createUI(RWTLifeCycle.java:172)

    at org.eclipse.rap.rwt.internal.lifecycle.RWTLifeCycle$UIThreadController.run(RWTLifeCycle.java:284)

    at java.lang.Thread.run(Unknown Source)

    at org.eclipse.rap.rwt.internal.lifecycle.UIThread.run(UIThread.java:105)

Is this the right way or is there a better way to change a process variable (without humantask interaction)?

Regards,

Sebastian

[swiderski.maciej]

when using persistence best is to use command to fetch variables to ensure the operation is done within transaction, see this section of docs.

HTH

[jayzay212]

Thank you for your answer! I used the sourcecode from the docs and changed the code to change values instead of retrieving them, but i get the same result like before. Did i forget something important for transactions maybe?

The code i used from docs:

Map<String, Object> variables = ksession.execute(new GenericCommand<Map<String, Object>>() {

    public Map<String, Object> execute(Context context) {

        KieSession ksession = ((KnowledgeCommandContext) context).getStatefulKnowledgesession();

        org.jbpm.process.instance.ProcessInstance processInstance = (org.jbpm.process.instance.ProcessInstance) ksession.getProcessInstance(piId);

        VariableScopeInstance variableScope = (VariableScopeInstance) processInstance.getContextInstance(VariableScope.VARIABLE_SCOPE);

        Map<String, Object> variables = variableScope.getVariables();

        return variables;

    }

});

Regards,

Sebastian

[jayzay212]

Well, forget what i said. It's working now. Thank you for your advice!