So if you can't easy throw a debugger at a running or deployed program, how do you tell what it's doing (and what's going wrong!)? Well, logging is the age-old technique of weaving code into your program that outputs a trace of what the program is doing.
Most languages offer an ability to output a string, which can be used for logging purposes. Here I'm thinking of calls like C's printf, perl's print and Java's System.out.println(). But there's a better way to add logging to software: a dedicated logging package like Log4J.
Log4J is a logging package written in Java distributed under a BSD-style license by the Apache group, and has been ported to a number of languages. It has a number of advantages over the simplistic System.out.println(), including:
Bob Frank is a Senior Engineer in Apple's Educational consulting group. He works with all Apple technologies, but is primarily focused on designing and developing Java based applications using Apple's application server WebObjects and using Apple's object persistence technology Enterprise Objects. In addition, he also helps run the Chicago Cocoa and WebObjects User Group (CAWUG), a local programing user group.
College of DuPage Building OCC, Rm. 128 C & D Fawell Boulevard and Lambert Rd. Glen Ellyn, IL 60137-6599Take 355 to Butterfield Rd (Rt 56). Take Butterfield West to Lambert Rd, then Lambert Rd North to 22nd St. Turn left and look for Lots 9 or 10 (A or B) on the left side of Fawell Blvd.
All UniForum Chicago SIG meetings are open to the public free of charge.
Contact Michael Potter at (630) 829-7033 or email@example.com for additional information about the meeting.
For more information about UniForum Chicago contact firstname.lastname@example.org.