[mwildam]

I just found out (also re-reading some NetBeans documentation) that the "errorMessage" in my test case was an attempt of NetBeans to guess the correct parameter to pass. "errorMessage" was a variable I used above but this was actually a bad guess.

Too much guessing is not good. If I move the cursor to somewhere else before finishing a code line might be left with some bad "default" from the guess of NetBeans and as the line has been autocompleted I might forget easily that this line should have been completed.