Issue Regarding SWTException: Invalid Thread Exception|synExec usage is getting failed

As it is SWTException, I used the syncExec method , but even I could not ressolve the SWTException issue from my code. Please suggest.

public class SampleSwtAction implements IWorkbenchWindowActionDelegate {
    开发者_如何学JAVAprivate IWorkbenchWindow window;

    public SampleSwtAction() {
    }


    public void run(IAction action) {

    MessageDialog.openInformation(
            window.getShell(),
            "SampleSwt",
            "Hello,Run swt application");


        window.getShell().getDisplay().syncExec(
                  new Runnable() {
                    public void run(){
                        Display firstDisplay = new Display();   

                        Shell firstShell = new Shell(firstDisplay);
                        firstShell.setText("Sample SWT application");
                        firstShell.setSize(200,100);
                        firstShell.open ();
                            while (!firstShell.isDisposed()) {
                            if (!firstDisplay.readAndDispatch())
                                firstDisplay.sleep ();
                        }
                        firstDisplay.dispose ();
                    }
                  });



    }


    public void selectionChanged(IAction action, ISelection selection) {
    }


    public void dispose() {
    }

    public void init(IWorkbenchWindow window) {
        this.window = window;
    }
}

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Just a guess, but you define a new Display 'firstDisplay' within your Runnable.

Shouldn't' you also put a syncExec(Runable) for all actions (updating the UI) you are taking on that display?

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Actually, the OP Abhishek Choudhary reports he doesn't need the extra display 'firstDisplay' and performs all he need to do within the single syncExec(Runable), with the default Display.