Log4j using Logger Wrapper with RollingFileAppender

Please follow the below steps to implement this example.

Step 1 : XML file for configuration.

log4j-configuration.xml

<xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration debug="true"

       xmlns:log4j='http://jakarta.apache.org/log4j/'>

       <appender name="ROLLING" class="org.apache.log4j.RollingFileAppender">

              <param name="File" value="sample.log" />

              <param name="MaxFileSize" value="100KB" />

              <param name="MaxBackupIndex" value="2" />

              <layout class="org.apache.log4j.PatternLayout">

                     <param name="ConversionPattern" value="%d %5p [%t] %c (%F:%L) - %m%n" />

              </layout>

       </appender>

       <root>

              <appender-ref ref="ROLLING" />

       </root>

</log4j:configuration>

Step 2 : Class to load logger configuration.

LoggerConfiguration.java:

public final class LoggerConfiguration {

       private LoggerConfiguration() {

              DOMConfigurator.configure("log4j-configuration.xml");

       }

       private static class LoggerConfigurationHolder {

              private static final LoggerConfiguration INSTANCE = new LoggerConfiguration();

       }

       public static LoggerConfiguration configure() {

              return LoggerConfigurationHolder.INSTANCE;

       }

}

Step 3 : Class to log the logging details

MyLogger.java

import org.apache.log4j.Level;

import org.apache.log4j.Logger;

public class MyLogger {

       private static String FQCN = MyLogger.class.getName();

       private Logger logger;

       public MyLogger(String name) {

              LoggerConfiguration.configure();

              this.logger = Logger.getLogger(name);

       }

       public MyLogger(@SuppressWarnings("rawtypes") Class clazz) {

              this(clazz.getName());

       }

       public void trace(Object message) {

              logger.log(FQCN, Level.TRACE, message, null);

       }

       public void trace(Object message, Throwable t) {

              logger.log(FQCN, Level.TRACE, message, t);

       }

       public boolean isTraceEnabled() {

              return logger.isEnabledFor(Level.TRACE);

       }

       public void debug(Object message) {

              logger.log(FQCN, Level.DEBUG, message, null);

       }

       public void debug(Object message, Throwable throwable) {

              logger.log(FQCN, Level.DEBUG, message, throwable);

       }

       public boolean isDebugEnabled() {

              return logger.isDebugEnabled();

       }

       public void info(Object message) {

              logger.log(FQCN, Level.INFO, message, null);

       }

       public void info(Object message, Throwable t) {

              logger.log(FQCN, Level.INFO, message, t);

       }

       public boolean isInfoEnabled() {

              return logger.isInfoEnabled();

       }

       public void warn(Object message) {

              logger.log(FQCN, Level.WARN, message, null);

       }

       public void warn(Object message, Throwable t) {

              logger.log(FQCN, Level.WARN, message, t);

       }

       public void error(Object message) {

              logger.log(FQCN, Level.ERROR, message, null);

       }

       public void error(Object message, Throwable t) {

              logger.log(FQCN, Level.ERROR, message, t);

       }

       public void fatal(Object message) {

              logger.log(FQCN, Level.FATAL, message, null);

       }

       public void fatal(Object message, Throwable t) {

              logger.log(FQCN, Level.FATAL, message, t);

       }

}

Step 4 : Class to test the Logger.

LoggerTest.java

public class LoggerTest {

       private static MyLogger LOG = new MyLogger(LoggerTest.class);

       public static void main(String[] args) {

              LOG.debug("Debugging Message");

              LOG.error("Error Message");

              LOG.info("Information Message");

              LOG.warn("Warning Message");

              LOG.trace("Tracing Message");

       }

}