WizardDialog.open() throw NullPointerException

Question

도구 모음에 NewCSSWizard를 추가하려고합니다. 이를 위해 플랫폼 명령 프레임 워크를 사용하여 명령 및 처리기 확장 점을 추가하십시오. WizardHandler를 확장하지만 작동하지 않고 NPE를 throw합니다. executeHandler (ExecutionEvent) 메서드에서 자체 마법사를 만들면 잘 작동합니다.

public class NewCssWizardHandler extends WizardHandler 
{ 
    @Override 
    protected void executeHandler(ExecutionEvent event) 
    { 
    try 
    { 
     IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindowChecked(event); 
     WizardDialog wizardDialog = new WizardDialog(window.getShell(), new NewCSSWizard()); 
     wizardDialog.open(); 
     } 
     catch (ExecutionException e) 
     { 
     e.printStackTrace(); 
     }   
    } 

    @Override 
    protected String getWizardIdParameterId() 
    { 
     return IWorkbenchCommandConstants.FILE_NEW_PARM_WIZARDID; 
    } 

    @Override 
    protected IWizardRegistry getWizardRegistry() 
    { 
     return PlatformUI.getWorkbench().getNewWizardRegistry(); 
    } 
} 

스택 트레이스 : 당신이 computeSelectedResources null 인수를 건네처럼

org.eclipse.e4.core.di.InjectionException: java.lang.NullPointerException 
    at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:63) 
    at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:231) 
    at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:212) 
    at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:131) 
    at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:171) 
    at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.executeItem(HandledContributionItem.java:831) 
    at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.handleWidgetSelection(HandledContributionItem.java:724) 
    at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.access$7(HandledContributionItem.java:708) 
    at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem$4.handleEvent(HandledContributionItem.java:647) 
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) 
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1276) 
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3562) 
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3186) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1053) 
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:942) 
    at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86) 
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:588) 
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) 
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:543) 
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) 
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124) 
    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:353) 
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180) 
    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:601) 
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629) 
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584) 
    at org.eclipse.equinox.launcher.Main.run(Main.java:1438) 
    at org.eclipse.equinox.launcher.Main.main(Main.java:1414) 
Caused by: java.lang.NullPointerException 
    at org.eclipse.ui.ide.IDE.computeSelectedResources(IDE.java:1480) 
    at org.eclipse.wst.css.ui.internal.wizard.NewCSSWizard.addPages(NewCSSWizard.java:48) 
    at org.eclipse.jface.wizard.WizardDialog.createContents(WizardDialog.java:605) 
    at org.eclipse.jface.window.Window.create(Window.java:431) 
    at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089) 
    at org.eclipse.jface.window.Window.open(Window.java:790) 
    at com.sdad.sdk.ui.actions.NewCssWizardHandler.executeHandler(NewCssWizardHandler.java:27) 
    at org.eclipse.ui.internal.handlers.WizardHandler.execute(WizardHandler.java:279) 
    at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:290) 
    at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:76) 
    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:601) 
    at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56) 

Answer 1

보인다. 그 메소드를 호출하기 전에 null 체크 만하면됩니다. 당신이 작업하고있는 코드가 NewCSSWizard.java이라고 가정합니다.

Answer 2

public class NewFileHandler extends AbstractHandler implements IHandler { 

    @Override 
    public Object execute(ExecutionEvent event) throws ExecutionException { 

     IWorkbenchWindow window = HandlerUtil 
       .getActiveWorkbenchWindowChecked(event); 
     System.out.println("window ok"); 

     NewFileWizard nfw = new NewFileWizard(); 

     nfw.init(PlatformUI.getWorkbench(), new StructuredSelection()); 
     WizardDialog dialog = new WizardDialog(window.getShell(), nfw); 
     System.out.println("new WizardDialog"); 
     dialog.open(); 
     System.out.println("dialog open"); 
     return null; 
    } 

}