java - Illegal attempt to exit early in Netbeans 8 form designer -


i'm mystified netbeans being unable render form in graphical designer. when run application, window , components display fine, so:

however, trying display same window in designer results in:

i have not been able pinpoint problem, given program works when run. gives?

edit: code suspected of being @ fault.

public void paint(graphics g) {     log.trace("painting...");     graphics2d g2 = (graphics2d) g;      g2.setstroke(new basicstroke(0.0f)); // hairline      affinetransform transformer = new affinetransform();     transformer.scale(scale, scale);      g2.settransform(transformer);      // todo: actual selection using combobox in frame.     collection<gravpoint> list = null;     (starsystem s: gamestate.inst().systems) {         if (list == null)             list = s.getcelestialobjects();     }      // largest orbit.     double maxorbit =1;     (gravpoint gp: list) {         if (gp.getorbit() > maxorbit)             maxorbit = gp.getorbit();         //log.debug(gp.getname() + " " + gp.getorbit());     }     //log.debug("maxorbit = "+maxorbit);      double x, y;     double orbit;     (gravpoint s: list) {         // todo: urgh, can't draw double-coordinates?         // center.         // orbital path.         orbit = 200*s.getorbit()/maxorbit;         g2.drawoval((int)(center.x/scale)-(int)orbit+1,(int)(center.y/scale)-(int)orbit+1, (int)orbit*2, (int)orbit*2);         // body.         x = center.x/scale + 200*s.getx()/maxorbit;         y = center.y/scale + 200*s.gety()/maxorbit;         g2.drawoval((int)x, (int)y , 3, 3);         // label.         g2.drawstring(s.getname() + "("+(int)x+","+(int)y+")", (float)x+10, (float)y+10);         g2.drawstring("x" + "("+center.x+","+center.y+")", (float)(center.x/scale), (float)(center.y/scale));         log.trace("printing "+s.getname()+" @ "+s.getx()+","+s.gety());     }     log.trace("done painting."); }


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