Exception when using the new Mwe2 File wizard

[miklossy]

The following exception is thrown when creating a new mwe2 file via the wizard:

138907 [main] ERROR org.eclipse.emf.mwe2.language.ui.wizard.NewMwe2FileWizard  - MWE2 does not exist
Java Model Exception: Java Model Status [MWE2 does not exist]
	at org.eclipse.jdt.internal.core.JavaElement.newJavaModelException(JavaElement.java:570)
	at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:247)
	at org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:583)
	at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:320)
	at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:306)
	at org.eclipse.jdt.internal.core.JavaElement.getChildren(JavaElement.java:261)
	at org.eclipse.jdt.internal.core.JavaProject.getPackageFragmentRoots(JavaProject.java:2143)
	at org.eclipse.emf.mwe2.language.ui.wizard.NewMwe2FileWizard$1.getModule(NewMwe2FileWizard.java:81)
	at org.eclipse.emf.mwe2.language.ui.wizard.NewMwe2FileWizard$1.getInitialContents(NewMwe2FileWizard.java:60)
	at org.eclipse.ui.dialogs.WizardNewFileCreationPage.createNewFile(WizardNewFileCreationPage.java:380)
	at org.eclipse.emf.mwe2.language.ui.wizard.NewMwe2FileWizard.performFinish(NewMwe2FileWizard.java:124)
	at org.eclipse.jface.wizard.WizardDialog.finishPressed(WizardDialog.java:778)
	at org.eclipse.jface.wizard.WizardDialog.buttonPressed(WizardDialog.java:417)
	at org.eclipse.jface.dialogs.Dialog.lambda$0(Dialog.java:619)
	at org.eclipse.swt.events.SelectionListener$1.widgetSelected(SelectionListener.java:81)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:249)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4428)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4238)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3817)
	at org.eclipse.jface.window.Window.runEventLoop(Window.java:818)
	at org.eclipse.jface.window.Window.open(Window.java:794)
	at org.eclipse.ui.internal.handlers.WizardHandler$New.executeHandler(WizardHandler.java:269)
	at org.eclipse.ui.internal.handlers.WizardHandler.execute(WizardHandler.java:290)
	at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:291)
	at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:92)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:55)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:305)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:239)
	at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132)
	at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:152)
	at org.eclipse.core.commands.Command.executeWithChecks(Command.java:494)
	at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:487)
	at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:210)
	at org.eclipse.ui.internal.handlers.LegacyHandlerService.executeCommand(LegacyHandlerService.java:390)
	at org.eclipse.ui.internal.actions.CommandAction.runWithEvent(CommandAction.java:151)
	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:565)
	at org.eclipse.jface.action.ActionContributionItem.lambda$4(ActionContributionItem.java:397)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4428)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4238)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3817)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1150)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1039)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:680)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:594)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:151)
	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:388)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1499)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1472)

@cdietrich Could you please confirm that the problem also occurs on your machine?

[cdietrich]

which version of platform and mwe

[cdietrich]

mwe needs a java project.
you dont have one

[cdietrich]

but it does not crash for me in 2019-03

[miklossy]

ah, ok, if it is a java project than it works.

[cdietrich]

does not crash in Version: 2019-12 M2 (4.14.0) MWE2 Language SDK 2.11.1.M1 org.eclipse.emf.mwe2.language.sdk.feature.group Eclipse Xtext to me

[cdietrich]

but there is a trace in error log in both versions
=> we dont treat non java projects properly / dont check that in logging / give user reasonable feedback

[miklossy]

We could also modify the wizard to allow only the selection of java projects.

[cdietrich]

or show an error message on the wizard

[miklossy]

Once #127 is done, we could consider to port the New MWE2 File Wizard to the wizard infrastructure provided by the Xtext framework.