when  exporting as an app un-check the field ("show stop button" or so) in the dialog

ok, but what if i dont want to export anything?

hello,

why not use the standard mode (the one you use also for interactive programs, see 2nd link below) with

1. noLoop();

Your code would be almost the same except for using setup() and draw()

Like this 
http://www.processing.org/learning/overview/


Greetings, Chrisir