Access to an object of my SWT thread from my Swing thread

So I have an SWT thread, an eclipse plugin that consists of a simple view myView, with a JPanel myJPanel and a JTree myJTree embedded into it. With a listener on the Swing thread, when the selection change on my JTree it refresh JPanel into the Swing thread.

Simplified code version of my myView :

 public class myView extends ViewPart {
  public java.awt.Frame myFrame;

     @Override
      public void createPartControl(Composite parent) { 
        Composite myComposite = new Composite(parent, SWT.EMBEDDED);
        myFrame = SWT_AWT.new_Frame(myComposite); 
        myFrame.add(myJPanel);
        myFrame.repaint();
        myFrame.revalidate();

        //same kind of code for Jtree -> myJTreeFrame 
    }

What I want to do is to refresh myFrame from the Swing thread, when the listener of myJTree has to refresh myJPanel

I thought about this :

public void valueChanged(TreeSelectionEvent e) {
// some code that refresh myJPanel       

Display.getDefault().asyncExec(
    new Runnable() {
      public void run() {
          try { 
            myView view = (viewMap4j)PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().showView( "pluginProject.myView");
          } catch (PartInitException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
          }
          view.myFrame.repaint();
          view.myFrame.revalidate(); 
      }
    });     
}

But I get this error with librairies : No exception of type PartInitException can be thrown; an exception type must be a subclass of Throwable

My question is : How to access to an object from my SWT thread (here myView) in a Swing thread? and any ideas to make it work in this specific example?

This did the trick, it gave me access to myView where I could find myFrame to refresh it from the JTree listener :

  PlatformUI.getWorkbench().getDisplay().asyncExec(
            new Runnable() {
              public void run() {
                try {
                  myView view =null;
                  view = (myView)PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().showView("pluginProject.myView");
                  view.reloadMyFrame();
                } catch (CoreException e) {
                  e.printStackTrace();
                } 
              }
            });