Log4j with Maven

Log4j with Maven

1. Add dependency.

<dependency>

<groupId>log4j</groupId>

<artifactId>log4j</artifactId>

<version>1.2.17</version>

</dependency>

2. Add log4j.properties file inside "src/main/java" package (Because when we are building the project this file will reside in /target/classes, you can select any package which is a java build path source )

# Root logger option

log4j.rootLogger=DEBUG, stdout, file

# Redirect log messages to console

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.Target=System.out

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

# Redirect log messages to a log file, support file rolling.

log4j.appender.file=org.apache.log4j.RollingFileAppender

log4j.appender.file.File=GIVE_PATH_FOR_LOGFILE

log4j.appender.file.MaxFileSize=5MB

log4j.appender.file.MaxBackupIndex=10

log4j.appender.file.layout=org.apache.log4j.PatternLayout

log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

3. Main function

import org.apache.log4j.Logger;

import org.apache.log4j.PropertyConfigurator;

public class LogMain {

final static Logger logger = Logger.getLogger(LogMain.class);

public static void main(String[] args) {

logger.debug("test debug");

logger.error("test error");

}

}

4. Run !!

You will get this in “GIVE_PATH_FOR_LOGFILE”

2015-02-23 15:42:39 DEBUG LogMain:12 - test debug

2015-02-23 15:42:39 ERROR LogMain:13 - test error