Invalid Thread Access?

[xcallmejudasx]

I have a Composite shell that has a button set-up to open the file dialog within windows but whenever I put the commands into the selection listener I get an invalid thread access error when I try to open that view.

//file path
	    new Label(banner, SWT.NONE).setText("Build File: ");
	    fdText = new Text(banner, SWT.BORDER);	    
	    Button open = new Button(banner, SWT.PUSH);
	    open.setText("Open");
		gridData = new GridData(GridData.HORIZONTAL_ALIGN_END);
	    open.setLayoutData(gridData);
	    	    
	    shell = new Shell(new Display());
	    shell.setSize(400, 400);
	    open.addSelectionListener(new SelectionAdapter() {
	    	public void widgetSelected(SelectionEvent event){
	    		FileDialog fd = new FileDialog(shell, SWT.OPEN);
	    	    fd.setText("Open");
	    	    fd.setFilterPath("C:/");
	    	    String selected = fd.open();
	    	    System.out.println(selected);      
	    	}
	    });

if I remove the contents of widgetSelected() it will load the view but the button does nothing when its pressed. I was looking around and it seems I need to synchronize the FileDialog to the Windows action timer so that multiple commands don't try to run at the same time or something but I can't figure out how. The simplest example I've seen is

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Shell;

public class MainClass {

  public static void main(String[] a) {
    Shell s = new Shell();
    
    FileDialog fd = new FileDialog(s, SWT.OPEN);
    fd.setText("Open");
    fd.setFilterPath("C:/");
    String[] filterExt = {"*.txt","*.doc", ".rtf", "*.*"};
    fd.setFilterExtensions(filterExt);
    String selected = fd.open();
    System.out.println(selected);                    
  }
}

The only thing I can think is that I need place code thats in widgetSelected to open from Main but I don't seem to have a main method.(Running Eclipse Ganyemede). Anyone know how to fix this so I can have a button within view activate the FileDialog in a new shell?

[xcallmejudasx]

I looked up Threads a little and added this to my code. It now runs the view instead of just displaying an error message. If I click on the open button nothing happens until I close the application and then an error message appears.

 //file path
	    new Label(banner, SWT.NONE).setText("Build File: ");
	    fdText = new Text(banner, SWT.BORDER);	    
	    Button open = new Button(banner, SWT.PUSH);
	    open.setText("Open");
		gridData = new GridData(GridData.HORIZONTAL_ALIGN_END);
	    open.setLayoutData(gridData);
	    	    
	    open.addSelectionListener(new SelectionAdapter() {
	    	public void widgetSelected(SelectionEvent event){
	    		 System.out.println("Testing before open");
	    		 
	    		 new Thread(new Runnable() {
	    		      public void run() {
	    		         while (true) {
	    		            try { Thread.sleep(1000); } catch (Exception e) { }
	    		            Display.getDefault().asyncExec(new Runnable() {
	    		               public void run() {
	    		            	   Display d = new Display();
	    		  	    		   Shell s = new Shell(d);
	    		  	    		   System.out.println("Testing Thread");
	    		  	    		   FileDialog fd = new FileDialog(s, SWT.OPEN);
	    		  		           fd.setText("Open");
	    		  		           String selected = fd.open();
	    		  		           System.out.println(selected);
	    		  		       }
	    		            });
	    		         }
	    		      }
	    		   }).start();
		         System.out.println("Testing after open");
	    	}
	    });

This is the error

!ENTRY org.eclipse.ui 4 0 2008-10-30 15:43:23.924
!MESSAGE Unhandled event loop exception
!STACK 0
org.eclipse.swt.SWTException: Invalid thread access
	at org.eclipse.swt.SWT.error(SWT.java:3777)
	at org.eclipse.swt.SWT.error(SWT.java:3695)
	at org.eclipse.swt.SWT.error(SWT.java:3666)
	at org.eclipse.swt.widgets.Display.checkDisplay(Display.java:714)
	at org.eclipse.swt.widgets.Display.create(Display.java:776)
	at org.eclipse.swt.graphics.Device.<init>(Device.java:135)
	at org.eclipse.swt.widgets.Display.<init>(Display.java:447)
	at org.eclipse.swt.widgets.Display.<init>(Display.java:438)
	at views.NewBuildView$1.widgetSelected(NewBuildView.java:84)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3823)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3422)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at novlayout.Application.start(Application.java:20)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
	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:386)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1212)

The console output right now is just Testing before open Testing after open.