In this project, TestLog4j, we have created a directory lib. We have downloaded log4j-1.2.17.jar and kept it in the lib directory. We have also created a file, log4j.properties, and kept it in the project.
The content of log4j.properties file
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# Root logger option
log4j.rootLogger=DEBUG, stdout, file
# The following properties are set to 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
# The following properties are set to redirect log messages to a file
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=D:\\log4j.log
log4j.appender.file.MaxFileSize=20MB
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
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package com.t4b.log.test;
import org.apache.log4j.Logger;
public class Test {
final static Logger logger = Logger.getLogger(Test.class);
public static void main(String[] args) {
PropertyConfigurator.configure("log4j.properties");
Test obj = new Test();
obj.testMethod("Totorials4Beginner");
}
private void testMethod(String msg) {
if (logger.isDebugEnabled())
logger.debug("This is debug : " + msg);
if (logger.isInfoEnabled())
logger.info("This is info : " + msg);
logger.warn("This is warn : " + msg);
logger.error("This is error : " + msg);
logger.fatal("This is fatal : " + msg);
}
The jar file has been configured as a required library of the project. If you are not familiar with this configuration, you may go through the following steps.
Java Build Path Configuration
- Right-click on the project in Project Explorer and select Properties.
- Click on Java Build Path, then select Libraries Tab
- Click on Add Jars, and a new window will be opened.
- In the Jar Selection window expand the project, then expand the lib directory where the jar file is kept.
- Select the jar file and click on Ok.
- After returning to the previous window, click on Apply and Close.
Now, you may run the project. To run this project, right-click on the Java file or Project, go to Run As and select Java Application.
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