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;
    }
}

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?

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.