Log4J from scratch

Log4J from scratch

Classes:

• Logger
• Categories
• Priorities
• Fatal
• Error
• Warn
• Info
• Debug
• Appenders
• Layouts

xml configured file has higher priority than properties file (log4j.xml is with highest priority than log4j.properties). Sample log4j.xml


The test class:

import org.apache.log4j.Logger;

public class Main {
/**
* Logger for this class
*/
private static final Logger logger = Logger.getLogger(Main.class);

public static void main(String[] args) {
if (logger.isDebugEnabled()) {
logger.debug("main(String[]) - start");
}

if (logger.isDebugEnabled()) {
logger.debug("main(String[]) - TADA Info - args=" + args);
}

logger.error("main(String[]) - Tada Severe", null);

if (logger.isEnabledFor(org.apache.log4j.Level.FATAL)) {
logger.fatal("main(String[]) - rsere", null);
}

logger.warn("main(String[]) - asfas", null);

if (logger.isEnabledFor(org.apache.log4j.Level.WARN)) {
logger.warn("main(String[]) - asfasf", null);
}

if (logger.isInfoEnabled()) {
logger.info("main(String[]) - adfasdfsdf");
}

if (logger.isDebugEnabled()) {
logger.debug("main(String[]) - end");
}
}

}