There are no pre written post processing out of the box as it depends on the problem (function set of GP). I will give a short background which you may find useful for what you are doing.
 For generating automated Rules to discriminate certain patterns, i had my GP have basic terminals and non-terminals required for the Rule. I would collect my "exceptional" Rules as a memory pad outside of evolutionary runs, everytime i see some well performing ones. Finally i get a Rule set and wrote my Custom "interpreter" that can parse the GP Individuals as s-expression to evaluate. So ECJ gives you GP and Evolution for free, you need to write custom functions and interpreter for them.
Hope that helps

On Thu, Apr 25, 2013 at 10:29 AM, Bojan Janisch <[log in to unmask]> wrote:
Hello everyone,

is there a post-processing-step in the Genetic Programming algorithm? I've search through the manual,
but did not find an explanation about this topic.

Thank you and greetings,