CODEWITHSUNDEEP
javaeclipse-pluginswteclipse-rcpjface
Prasad S Deshpande
Prasad S Deshpande

Reputation: 1412

NullPointerException for org.eclipse.ui.internal.WorkbenchPage.showView

Facing NullPointerException for WorkbenchPage.ShowView(String viewId).

stackstrace is as following.

!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.ui.workbench". !STACK 0

java.lang.NullPointerException
    at org.eclipse.ui.internal.WorkbenchPage.setState(WorkbenchPage.java:4024)
    at org.eclipse.ui.internal.WorkbenchPage.toggleZoom(WorkbenchPage.java:4096)
    at org.eclipse.ui.internal.WorkbenchIntroManager.setIntroStandby(WorkbenchIntroManager.java:201)
    at org.eclipse.ui.internal.WorkbenchPage.checkIntro(WorkbenchPage.java:1202)
    at org.eclipse.ui.internal.WorkbenchPage.busyShowView(WorkbenchPage.java:1170)
    at org.eclipse.ui.internal.WorkbenchPage.busyShowView(WorkbenchPage.java:1140)
    at org.eclipse.ui.internal.WorkbenchPage$20.run(WorkbenchPage.java:3925)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3922)
    at org.eclipse.ui.internal.WorkbenchPage.showView(WorkbenchPage.java:3898)
    at com.rcp.app.foundation.ui.services.PerspectiveChangeListener.perspectiveActivated(PerspectiveChangeListener.java:60)
    at org.eclipse.ui.internal.PerspectiveListenerList$1.run(PerspectiveListenerList.java:74)

I not getting what I am missing exactly. Can anyone help me to find out what exactly I am missing in this flow.

I wrote perspectiveChangeListner as following.

    public class PerspectiveChangeListener implements IPerspectiveListener, IPerspectiveListener3
{
/**
  * WindowTitleUpdater Object to update the window title based on selected erspectives.
  */
    private WindowTitleUpdater windowTitleUpdater = null;



/**
     * Constructor.
     * @param windowTitleUpdater
     */
    public PerspectiveChangeListener( WindowTitleUpdater windowTitleUpdater )
    {
        this.windowTitleUpdater = windowTitleUpdater;
    }

   /**
     * (non-Javadoc).
     * @see org.eclipse.ui.IPerspectiveListener#perspectiveActivated(org.eclipse.ui.IWorkbenchPage,
     *      org.eclipse.ui.IPerspectiveDescriptor)
     */


 @Override
    public void perspectiveActivated( IWorkbenchPage page, IPerspectiveDescriptor perspective )
    {
        windowTitleUpdater.updateTitle( false );
        if ( perspective.getId().equals( "com.app.perspective.id" ) )
        {
            try
            {
                page.showView( "com.app.view.id" );
            }
        }
    }

Upvotes: 0

Views: 1281

Answers (1)

greg-449
greg-449

Reputation: 111216

The perspectiveActivated listener is fired by the WorkbenchPage, the page seems not expect the listener to call the page showView method in the listener and gets confused if it does.

Use Display.asyncExec to run the showView call. This will run the code after the WorkbenchPage has finished the work it is doing.

Upvotes: 1

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