[news.eclipse.platform.swt] Re: Invalid thread access, but using only 1

[craquerpro@xxxxxxxx (David Perez)]

To update the UI from other threads, you must use Display#asyncExec()

Eric de Vries wrote:

> I am trying to build a simple app using SWT, but ever since i changed a 
> bit of code to use another thread for processing some objects i have, swt 
> throws an error about invalid thread access. So after fixing it (i 
> thought) it still throws the error. Even after removing ALL references to 
> the other thread object, not even initializing it or using it at all, it 
> doesnt get past the "new Display()" code

> The code, without useless code

> public static void main(String[] args) {
> 	MainFrame frame = new MainFrame();
> }

> public class MainFrame {
> 	public MainFrame() {
> 		createWindow();
> 	}

> 	public void createWindow() {
> 		Display display = new Display(); // it happens here
> 		// etc
> 	}
> }

> and the exception:

> Exception in thread "main" org.eclipse.swt.SWTException: Invalid thread 
> access
>         at org.eclipse.swt.SWT.error(Unknown Source)
>         at org.eclipse.swt.SWT.error(Unknown Source)
>         at org.eclipse.swt.SWT.error(Unknown Source)
>         at org.eclipse.swt.widgets.Display.checkDisplay(Unknown Source)
>         at org.eclipse.swt.widgets.Display.create(Unknown Source)
>         at org.eclipse.swt.graphics.Device.<init>(Unknown Source)
>         at org.eclipse.swt.widgets.Display.<init>(Unknown Source)
>         at org.eclipse.swt.widgets.Display.<init>(Unknown Source)
>         at kippers.gui.MainFrame.createWindow(MainFrame.java:96)
>         at kippers.gui.MainFrame.<init>(MainFrame.java:57)
>         at kippers.Main.main(Main.java:25)

> Notice how it says: Exception in thread "main" 

> What is the cause of this error? And how do i solve this? Im pretty 
> clueless about this one, because it happens at the initialization of the 
> Display object, and i read the main thread is determined by the thread the 
> "new Display()" code is called in!

> Seriously, i cant figure this one out