Exit(1) : Terminate the AE immediately and rollback all DB changes made
exit(0) : Terminate the AE immediately but will not rollback the DB changes made.
This is my understanding -
Any non-zero return code is some kind of error. The way it will be handled depends on “On Return” value for each step of application engine.
So exit(0) – is success
exit(1) and On Return = Abort – is error and exit program immediately
exit(1) and On Return = Break – is exit current step and section
exit(1) and On Return = Skip Step – exits current step, continue with next step
Navigate to the process definition of the application engine that you would like to trace (PeopleTools > Process Scheduler > Processes). Go to the Overrride Options tab, and from the Parameter List drop down select Append, and in the edit box next to it add the following line:
This will trace SQLs inside of your application engine as well as peoplecode. Save the process definition and go ahead and run your program. To examine the trace files, just navigate to the process monitor, click details on your process, then View Log/Trace.
-TRACE output goes into Application Engine Trace (.AET)
-TOOLSTRACEPC output goes into the PeopleTools trace file (.trc)
原文：http://www.cnblogs.com/binquan/p/4975354.html