ECJ does not use or affect asserts in any way: so it had to be your code. Sean On Apr 10, 2014, at 3:30 PM, Eric 'Siggy' Scott <[log in to unmask]> wrote: > Inside my custom Problem implementation, I had an assert that was failing, but no output was printed to the screen. The evolutionary run just crashed without explanation. > > Debugging was tricky, because all I knew was that it crashed with "-ea" and didn't crash without it. > > Does ECJ somehow suppress assert messages even when asserts are enabled? Or is it more likely that I somehow managed to do so myself? > > Siggy > > -- > > Ph.D student in Computer Science > George Mason University > http://mason.gmu.edu/~escott8/