hello everybody

i would like to write a logfile when initialising an object, collecting all decisions made during the initialising process.
i have a PrintWriter set up, and calling it during initialising. but i always get a NullPointerException. I understand that it has something to do with the initialising process as it, because all class functions report correctly when called after the initialising.

any ideas how to achieve the goal otherwise?
thank you very much.