main function Null safety
Implementation
void main(List<String> args) async {
  if (!await InternalStateWindow.takeControl(args)) {
    runStaticInitialization15();
    genericMain(Jrpn(Controller15(createModel15())));
  }
}
void main(List<String> args) async {
  if (!await InternalStateWindow.takeControl(args)) {
    runStaticInitialization15();
    genericMain(Jrpn(Controller15(createModel15())));
  }
}