While doing application development it's require you to write logs into File or print logs into Console with expected Date/Time, ProgramName with line number and many more information.
log4j.properties :
1. Define CONSOLE as rootLogger
2. Add Following lined into lo4j.properties- Download Apache Log4j.jar and add it to your classpath
- Create Instance of Logger
- Use debug,info,warn,error,fatal methods to log required information
package com.anuj.application; import org.apache.log4j.Logger; public class ClientApplication { static Logger logger = Logger.getLogger(ClientApplication.class.getName()); public static void main(String[] args) { System.out.println("Application started successfully"); logger.debug("This is debug message"); logger.info("This is info message"); logger.warn("This is warn message"); logger.fatal("This is fatal message"); logger.error("This is error message"); System.out.println("Application end successfully"); } }
log4j.rootLogger=DEBUG,LOGFILE log4j.appender.LOGFILE=org.apache.log4j.RollingFileAppender log4j.appender.LOGFILE.File=application.log log4j.appender.LOGFILE.MaxFileSize=10MB log4j.appender.LOGHANDLE.MaxBackupIndex=10 log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout log4j.appender.LOGFILE.layout.ConversionPattern=[%t] %-5p %c %d{dd/MM/yyyy HH\:mm\:ss} - %m%nIf your application requires to use Console Appender then you can use add ConsoleAppender in you application log4j.properties.
1. Define CONSOLE as rootLogger
log4j.rootLogger=DEBUG,LOGFILE log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout log4j.appender.CONSOLE.layout.ConversionPattern=%d{dd/MM/yyyy HH\:mm\:ss} [%t] %-5p %c{1} (%t\:%L) - %m%n
Console Output :
Application started successfully 15/12/2012 23:28:46 [main] DEBUG ClientApplication (main:13) - This is debug message 15/12/2012 23:28:46 [main] INFO ClientApplication (main:14) - This is info message 15/12/2012 23:28:46 [main] WARN ClientApplication (main:15) - This is warn message 15/12/2012 23:28:46 [main] FATAL ClientApplication (main:16) - This is fatal message 15/12/2012 23:28:46 [main] ERROR ClientApplication (main:17) - This is error message Application end successfully
File Output :
[main] DEBUG com.anuj.application.ClientApplication 15/12/2012 23:28:46 - This is debug message [main] INFO com.anuj.application.ClientApplication 15/12/2012 23:28:46 - This is info message [main] WARN com.anuj.application.ClientApplication 15/12/2012 23:28:46 - This is warn message [main] FATAL com.anuj.application.ClientApplication 15/12/2012 23:28:46 - This is fatal message [main] ERROR com.anuj.application.ClientApplication 15/12/2012 23:28:46 - This is error message
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