При сбросе перспективы на E4 возникает ошибка

Question

При сбросе код перспективы делается так, как в указанной ссылке https://www.eclipse.org/forums/index.php/m/1209165/srch=reset+perspective+in+e4 а код называется как код следует

public class ResetPerspective {
// private static final String MAIN_PERSPECTIVE_STACK_ID = "MainPerspectiveStack";

 @Execute
 public void execute(@Named(IServiceConstants.ACTIVE_SHELL) Shell shell,
        EModelService modelService, MApplication app,
        EPartService partService) {

    MWindow window = (MWindow) modelService.find("Main", app);  //main

    final MPerspective perspective = modelService.getActivePerspective(window);

    final MUIElement snippet = modelService.cloneSnippet(app,
            perspective.getElementId(), window);
    snippet.setToBeRendered(true);
    if (snippet != null) {
        MElementContainer<MUIElement> parent = perspective.getParent();
        perspective.setToBeRendered(false);

        List<MWindow> existingDetachedWindows = new ArrayList<MWindow>();
        existingDetachedWindows.addAll(perspective.getWindows());



        MPerspective dummyPerspective = (MPerspective) snippet;
        while (dummyPerspective.getWindows().size() > 0) {
            MWindow detachedWindow = dummyPerspective.getWindows()
                    .remove(0);
            perspective.getWindows().add(detachedWindow);
        }

        parent.getChildren().remove(perspective);

        parent.getChildren().add(snippet);
        System.out.println(parent.getChildren().get(0).getElementId());
        partService.switchPerspective((MPerspective) snippet);
    }
 }

}

и выбор перспективы сброса дает следующую ошибку

!ENTRY org.eclipse.e4.ui.workbench 4 0 2014-06-10 11:28:54.063
!MESSAGE Internal Error
!STACK 0
org.eclipse.e4.core.di.InjectionException: java.lang.IllegalArgumentException: 
    at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:63)
    at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:243)
    at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:224)
    at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132)
    at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:167)
    at org.eclipse.core.commands.Command.executeWithChecks(Command.java:499)
    at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
    at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:213)
    at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.executeItem(HandledContributionItem.java:850)
    at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.handleWidgetSelection(HandledContributionItem.java:743)
    at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.access$7(HandledContributionItem.java:727)
    at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem$4.handleEvent(HandledContributionItem.java:662)
    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:140)
    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)
Caused by: java.lang.IllegalArgumentException: 
    at org.eclipse.core.runtime.Assert.isLegal(Assert.java:63)
    at org.eclipse.core.runtime.Assert.isLegal(Assert.java:47)
    at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.findElementsRecursive(ModelServiceImpl.java:286)
    at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.findElements(ModelServiceImpl.java:371)
    at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.getActivePerspective(ModelServiceImpl.java:1075)
    at bomb.handlers.ResetPerspective.execute(ResetPerspective.java:44)
    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.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
    ... 33 more

Answer 1

Похоже, у вас нет окна в модели приложения с идентификатором "Main", поэтому modelService.find("Main", app) возвращается ноль. ноль является недопустимым аргументом modelService.getActivePerspective(window) так что вы получите ошибку.

Вы должны адаптировать этот код, который вы нашли, чтобы использовать идентификаторы для вашего приложения. Вы также должны следовать инструкциям по созданию фрагментов для перспектив.