Intro

One log framework to rule them all.

log4j

log4j is a reliable, fast and flexible logging framework (APIs) written in Java.

pom.xml

<dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency>

Main components [1]

• loggers: Responsible for capturing logging information.
• appenders: Responsible for publishing logging information to various preferred destinations.
• layouts: Responsible for formatting logging information in different styles.

Example

//logs an error message with parameter
	logger.error("This is error : " + parameter);
	
	//logs an exception thrown from somewhere
	logger.error("This is error", exception);

REFs

[1] https://www.tutorialspoint.com/log4j/log4j_overview.htm