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Home » Eclipse Projects » BPMN 2.0 Modeler » How to extend a model entry at runime
How to extend a model entry at runime [message #1643539] Sun, 01 March 2015 16:30 Go to next message
Ralph Soika is currently offline Ralph SoikaFriend
Messages: 146
Registered: July 2009
Senior Member
I have a strange problem with my BPMN extension based on the customTask example.
So far everything works. I use the method createBindings() to test if my taskConfig element already exists:

...
List<TaskConfig> allTaskConfigs = ModelDecorator
				.getAllExtensionAttributeValues(myTask, TaskConfig.class);
		if (allTaskConfigs.size() == 0) {


...if not I create a new one and initialize also some parameters :

	Parameter param = ModelFactory.eINSTANCE.createParameter();
		param.setName("somename");
		param.setValue("");
		taskConfig.getParameters().add(param);


Now I can bind a widget with the following code:

		bindAttribute(this.getAttributesParent(),param, "value", "Summary");


So fare all is fine. The problem is, that if I try to open an older bpmn file which was created before I added a new parameter into my plugin I need to add the missing new parameter.
But if I try to add the parameter in the createBindings() method I got the following Error:

java.lang.IllegalStateException: Cannot modify resource set without a write transaction
	at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.assertWriting(TransactionChangeRecorder.java:348)
	at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.appendNotification(TransactionChangeRecorder.java:302)
	at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.processObjectNotification(TransactionChangeRecorder.java:284)
	at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.notifyChanged(TransactionChangeRecorder.java:240)
	at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:374)
	at org.eclipse.emf.ecore.util.EcoreEList.dispatchNotification(EcoreEList.java:249)
	at org.eclipse.emf.common.notify.impl.NotifyingListImpl.addUnique(NotifyingListImpl.java:294)
	at org.eclipse.emf.common.util.AbstractEList.add(AbstractEList.java:303)
	at org.imixs.bpmn.model.ImixsRuntimeExtension.initializeProperty(ImixsRuntimeExtension.java:95)
	at org.imixs.bpmn.model.ImixsRuntimeExtension.getProperty(ImixsRuntimeExtension.java:120)
	at org.imixs.bpmn.properties.ProcessSummaryPropertySection$SummaryDetailComposite.createBindings(ProcessSummaryPropertySection.java:44)
	at org.eclipse.bpmn2.modeler.core.merrimac.clad.AbstractDetailComposite.setBusinessObject(AbstractDetailComposite.java:131)
	at org.imixs.bpmn.properties.AbstractImixsDetailComposite.setBusinessObject(AbstractImixsDetailComposite.java:110)
	at org.eclipse.bpmn2.modeler.core.merrimac.clad.AbstractBpmn2PropertySection.refresh(AbstractBpmn2PropertySection.java:223)
	at org.eclipse.ui.views.properties.tabbed.TabContents$6.run(TabContents.java:217)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:50)
	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:178)
	at org.eclipse.ui.views.properties.tabbed.TabContents.refresh(TabContents.java:220)
	at org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage$SelectionChangedListener.selectionChanged(TabbedPropertySheetPage.java:222)
	at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:163)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:50)
	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:178)
	at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:160)
	at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:2171)
	at org.eclipse.jface.viewers.StructuredViewer.handleSelect(StructuredViewer.java:1202)
	at org.eclipse.jface.viewers.StructuredViewer$4.widgetSelected(StructuredViewer.java:1231)
	at org.eclipse.jface.util.OpenStrategy.fireSelectionEvent(OpenStrategy.java:242)
	at org.eclipse.jface.util.OpenStrategy.access$4(OpenStrategy.java:236)
	at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:408)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4454)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1388)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1412)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1397)
	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1182)
	at org.eclipse.ui.internal.views.properties.tabbed.view.TabbedPropertyList.select(TabbedPropertyList.java:864)
	at org.eclipse.ui.internal.views.properties.tabbed.view.TabbedPropertyList$2.mouseUp(TabbedPropertyList.java:175)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:220)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4454)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1388)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3799)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3409)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1151)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1032)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:148)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:636)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:579)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:135)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:648)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1438)



How can I solve this problem?
Re: How to extend a model entry at runime [message #1643988 is a reply to message #1643539] Sun, 01 March 2015 21:41 Go to previous message
Ralph Soika is currently offline Ralph SoikaFriend
Messages: 146
Registered: July 2009
Senior Member
I think I figured out how to solve this situation. The trick is to embedd the code into a EMF transactional editing domain:

TransactionalEditingDomain domain = TransactionUtil.getEditingDomain(be);
		domain.getCommandStack().execute(new RecordingCommand(domain) {
		public void doExecute() {
                 ....
 	       }
        }
  );


I added also some information about this into my blog: http://ralph.soika.com/extending-eclipse-bpmn2-plugin-part-iii/
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