Program exits with the System.exit(3) exit code, help?

Question

When I ran my program(a simulation for a wind powered vehicle), it suddenly ends with no apparent reason, and returns System.exit(3) exit code.
I have no Idea what this exit code means, and thus am stuck in the debugging...
Help is greatly appreciated

Answer 1

No error messages?
If not, then you need to search for all instances of
catch (WhateverException var) {}and replace them with
catch (WhateverException var) {
  var.printStackTrace();
}