Loading dialog doesnt paints while loading other things

I'm trying to do some kind of load screen while a heavy load code its working but i can't make the loading screen gets painted, it just have it's inside in white instread of show it's label of "Loading please wait"

It's seems that the overl开发者_如何学Gooad of the main program doesnt allows the other dialog (launched with a thread to allow me to make it modal but the code go on in background) get painted or something like that

Thank you

The typical problem is that the code is doing a long running task on the EDT. The solution is "Don't block the EDT".

See the Concurrency in Swing lesson of the Java Tutorials for further details.