You're facing the most common exception in SWT world! Invalid Thread Access means only one thing: you want to modify or simply access a GUI element and you're doing it in a thread that is not the GUI thread.

It never happens when your code comes a click on button or something like this, but, when you're using background process or asynchronous notifications, it occurs all the time.

There's one solution: execute your code in a specific block:

Display.getDefautl().syncExec(new Runnable() {
   public void run() {
      // code related to GUI element(s)
   }
}

or

Display.getDefautl().asyncExec(new Runnable() {
   public void run() {
      // code related to GUI element(s)
   }
}

In the first case, the execution is synchronous. The calling thread waits for the run method to be executed. In the second case, the calling thread is not waiting.

경축! 아무것도 안하여 에스천사게임즈가 새로운 모습으로 재오픈 하였습니다.
어린이용이며, 설치가 필요없는 브라우저 게임입니다.
https://s1004games.com

To learn more about threads in Eclipse application, look at the stack in your Debug view (in debug mode). The first thread called Main is the UI thread.