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log4j-logging

log4j is a very popular logging library for Java development. It provides convenient and flexible logging mechanism as well as fast performance.

Typically, configuring log4j involves in the following tasks:

Configure the root logger.
Configure individual loggers (if needed).
Specify appenders.
Specify message layout.

The specifiers used in the above example:

t: name of the current executing thread.
p: priority
c: category
m: log message.
n: line separator character.

There are three ways to configure log4j:

Using .properties file.
Using XML file.
Using Java code programmatically.