Impossible de créer des instances GEF dans la vue RCP

Question

Il s'agit d'une automatisation dont j'ai besoin pour utiliser GEF dans une application RCP.

Dans l'une des vues, je dois créer une instance de GEF, mais si j'essaie de créer ces instances, elle lance une erreur disant ne pas pouvoir instancier la vue.

Voici la décharge d'erreur

SESSION 2010-12-03 14:06:06.650 ----------------------------------------------- 
eclipse.buildId=unknown 
java.version=1.7.0-ea 
java.vendor=Sun Microsystems Inc. 
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US 
Framework arguments: -product GEFTutorial.product 
Command-line arguments: -product GEFTutorial.product -data C:\Documents and Settings\rtiragat\workspace/../runtime-GEFTutorial.product -dev file:C:/Documents and Settings/rtiragat/workspace/.metadata/.plugins/org.eclipse.pde.core/GEFTutorial.product/dev.properties -os win32 -ws win32 -arch x86 -consoleLog 

!ENTRY org.eclipse.equinox.registry 4 1 2010-12-03 14:06:09.680 
!MESSAGE Unable to create view ID GEFTutorial.view: Plug-in "GEFTutorial" was unable to instantiate class "geftutorial.View". 
!STACK 0 
java.lang.NoClassDefFoundError: org/eclipse/gef/EditPartFactory 
    at java.lang.Class.getDeclaredConstructors0(Native Method) 
    at java.lang.Class.privateGetDeclaredConstructors(Unknown Source) 
    at java.lang.Class.getConstructor0(Unknown Source) 
    at java.lang.Class.newInstance0(Unknown Source) 
    at java.lang.Class.newInstance(Unknown Source) 
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:184) 
    at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:904) 
    at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243) 
    at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55) 
    at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:259) 
    at org.eclipse.ui.internal.registry.ViewDescriptor.createView(ViewDescriptor.java:63) 
    at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:327) 
    at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:229) 
    at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595) 
    at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:313) 
    at org.eclipse.ui.internal.ViewPane.setVisible(ViewPane.java:529) 
    at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:180) 
    at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:270) 
    at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65) 
    at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:473) 
    at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1254) 
    at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1207) 
    at org.eclipse.ui.internal.PartStack.showPart(PartStack.java:1606) 
    at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:647) 
    at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:574) 
    at org.eclipse.ui.internal.PartSashContainer.createControl(PartSashContainer.java:568) 
    at org.eclipse.ui.internal.PerspectiveHelper.activate(PerspectiveHelper.java:272) 
    at org.eclipse.ui.internal.Perspective.onActivate(Perspective.java:981) 
    at org.eclipse.ui.internal.WorkbenchPage.onActivate(WorkbenchPage.java:2632) 
    at org.eclipse.ui.internal.WorkbenchWindow$27.run(WorkbenchWindow.java:2986) 
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) 
    at org.eclipse.ui.internal.WorkbenchWindow.setActivePage(WorkbenchWindow.java:2967) 
    at org.eclipse.ui.internal.WorkbenchWindow.busyOpenPage(WorkbenchWindow.java:771) 
    at org.eclipse.ui.internal.Workbench$23.runWithException(Workbench.java:1221) 
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31) 
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) 
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134) 
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041) 
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660) 
    at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803) 
    at org.eclipse.ui.internal.Workbench$31.runWithException(Workbench.java:1567) 
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31) 
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) 
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134) 
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041) 
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660) 
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2548) 
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438) 
    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671) 
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) 
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664) 
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) 
    at geftutorial.Application.start(Application.java:20) 
    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:369) 
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) 
    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:619) 
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574) 
    at org.eclipse.equinox.launcher.Main.run(Main.java:1407) 
    at org.eclipse.equinox.launcher.Main.main(Main.java:1383) 
Caused by: java.lang.ClassNotFoundException: org.eclipse.gef.EditPartFactory 
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:506) 
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422) 
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410) 
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107) 
    at java.lang.ClassLoader.loadClass(Unknown Source) 
    at java.lang.ClassLoader.loadClassInternal(Unknown Source) 
    ... 66 more 

Answer 1

Vous pouvez consulter la page « Shape diagram Editor » et le wiki « GEF_Description2 » pour vérifier si votre utilisation d'un spectateur est ici appropriée. Voir par exemple this example.