I will try to install the game on a real phone and see if it works. And after that I will look deeper into the code. It might be a install problem. The game is a hobby project that is intended to be published for downloading to phones.

I have been using flushGraphics if that is what you mean double buffer. Maybe there is  better way to do double buffer?

The apply does start. The backgrond color is painted on the screen but not the images and sound. I do not request repaint(). There is a automatic paint in the end of the loop, the repaint is controlled by the loop time sequence. I will look into doubble buffering and quadTree. But when it comes to collision, painting and other actions I have made it to be unactive until the player is close to the so all actors and collision testing does not happen.

Can it be that i have to many actor objects to paint out to the screen, I have about 50 enemies on the first level. Maybe I should make different threads for collisionstest and all other tests?

In wtk ota is a option for testing, over-the-air. The game is getting installed to the emulator when it is run through ota. The error message is uncaugth exception, nullPointer. Cant track it down cause it doesnt give any information in what class or anything.

Havent tried it on a real phone. new to this so i havent learned how to instal to phones yet. Just strange that it work on wtk on ordinary run but not in ota in wtk

I have a game that works in the wireless tool kit but when i run it OTA in the wireless tool kit it doesnt work. The music works but no Images is shown, a error message in the wireless toolkit " java/Lang/ null pointer exception" I dont understand what is wrong when it works when it is run without the ota. Regards Mick