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[EMFForms] How to enable creation and linking of Reference Features when embedding the Editor? [message #1266526]

Fri, 07 March 2014 15:24

Marina Knieling

Messages: 83
Registered: February 2013

Member

Hey guys, me again ;-)

I managed to create my own viewmodel and open it from my own ListViewer.
I simply used the ECPE4Editor (removed the reference to the ECPProject)
and wrote and registered my own E4ModelElementOpener. Everything works
fine and the reference features show up in the editor. Nevertheless it
is not possible to add or link new / existing elements. You mention in
your tutorial
(http://eclipsesource.com/blogs/tutorials/emf-client-platform-how-to-customize-the-editor-layout/#embbededitor)
that this is not supported out of the box. So my question is: what do I
need to do in order to make this work?

Actually I'm getting a ConcurrentModificationException when trying to
add a new element and a NullPointerException when trying to link an
existing element. Stack trace below:

!ENTRY org.eclipse.e4.ui.workbench 4 0 2014-03-07 15:56:15.209
!MESSAGE Internal Error
!STACK 0
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
at java.util.HashMap$KeyIterator.next(Unknown Source)
at org.eclipse.emf.ecp.core.util.ECPUtil.getSubClasses(ECPUtil.java:139)
at
org.eclipse.emf.ecp.spi.ui.ECPReferenceServiceImpl.getNewElementFor(ECPReferenceServiceImpl.java:109)
at
org.eclipse.emf.ecp.edit.internal.swt.reference.NewReferenceAction.run(NewReferenceAction.java:155)
at
org.eclipse.emf.ecp.edit.internal.swt.util.SWTControl$4.widgetSelected(SWTControl.java:326)
at
org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)
at
org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)
at
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at
org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)
at
org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:138)
at
org.eclipse.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:162)
at
org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
at org.eclipse.equinox.launcher.Main.main(Main.java:1426)

and number two:

!ENTRY org.eclipse.e4.ui.workbench 4 0 2014-03-07 16:04:36.197
!MESSAGE Internal Error
!STACK 0
java.lang.NullPointerException
at
org.eclipse.emf.ecp.spi.ui.ECPReferenceServiceImpl.getExistingElementFor(ECPReferenceServiceImpl.java:149)
at
org.eclipse.emf.ecp.edit.internal.swt.reference.AddReferenceAction.run(AddReferenceAction.java:106)
at
org.eclipse.emf.ecp.edit.internal.swt.util.SWTControl$4.widgetSelected(SWTControl.java:326)
at
org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)
at
org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)
at
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at
org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)
at
org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:138)
at
org.eclipse.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:162)
at
org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
at org.eclipse.equinox.launcher.Main.main(Main.java:1426)

Thanks and have a nice weekend

Marina

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Re: [EMFForms] How to enable creation and linking of Reference Features when embedding the Editor? [message #1270158 is a reply to message #1266526]

Wed, 12 March 2014 15:11

Eugen Neufeld

Messages: 63
Registered: March 2012

Member

Hi Marina,
In order to reference an EObject, EMF Forms needs to know where to search for possible elements. The default implementation relies on the ECPProject of the currently opened EObject. The NullPointerException you get is caused by the missing ECPProject.
So you would need to provide your own ReferenceService. As you already have your own e4 editor class, you will find this line:

final ViewModelContext vmc = ViewModelContextFactory.INSTANCE.createViewModelContext(view, modelElement,
				new ECPReferenceServiceImpl());

Instead of the ECPReferenceServiceImpl that is provided there you have to provide your own ReferenceService.

The ConcurrentModificationException should not be there. I will have to check this, maybe it has something to do with the wrong uri that caused the EMFStore errors?
The exception occurs, because EMF adds additional EPackages to the EPackageRegistry while reading all EPackages. This shouldn't happen normally.

Cheers,
Eugen

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