logging : Java Glossary

2008-04-14 by Roedy Green ©1996-2008 Canadian Mind Products
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logging

Dumping out information as a program proceeds to a file. It may be a log of transactions, debugging information or raw material for statistics. This sounds like something mindless that could be entirely handled with println, but by adding sufficient bells and whistles it becomes an entire package unto itself. For example, you control at runtime which logging information you want included using the LogManager class and a configuration file. You have multiple log files, that cycle rather than one big one.

There are logging classes built-in to Java 1.1.4+. Here is how you use them:

Log4J allows channels to stream different classes of messages to different files, and to configure logging behaviour after the code is compiled on a very fine granularity.

Instead of peppering your code with debugging println statements that you remove entirely when you find the bug, with logging you leave the logging/generic debug instrumentation code in place, and turn it on and off, in different parts of the program, to varying degrees of detail, at run time, without having to recompile. You normally leave at least a minimum amount of the logging engaged even in production to help track down trouble and to produce statistics.

Normally small project would not use a formal logging package, but almost any team project will be fitted with a logger.

Learning More

Sun’s JDK Technote Guide on Logging : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 on your local J: drive.

Sun’s Javadoc on the Logger class : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in JDK 1.5.0_15 on your local J: drive.

Sun’s Javadoc on the FileHandler class : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in JDK 1.5.0_15 on your local J: drive.

Sun’s Javadoc on the Level class : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in JDK 1.5.0_15 on your local J: drive.

Sun’s Javadoc on the SimpleFormatter class : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in JDK 1.5.0_15 on your local J: drive.

Sun’s Javadoc on the LogManager class : available:

on the web at java.Sun.com
in the JDK 1.6.0_06 or in JDK 1.5.0_15 on your local J: drive.

Books

recommend book⇒The Complete Manual log4j

paperback

ISBN13:

978-2-97003690-6

ISBN10:

2-97003690-8

publisher:

QOS.ch

published:

2003-05-07

by:

Ceki Gülcü

	amazon.ca	amazon.com
	chapters.indigo.ca	powells.com
	amazon.fr	barnesandnoble.com
	amazon.de	amazon.co.uk

Appache Logging
Log4c
log4C++
Log4CPlus
Log4j
Log4Perl
Log4PLSQL
Log4Web
Lumbermill
Protomatter Syslog
SuperLogging

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