Question

I have developed a spring application, I want to configure it with apache log4j, have downloaded it and put the jar in project’s class path. Below is my log4j.Properties file.

# Root logger option
log4j.rootLogger=INFO, file
# Direct log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=C\:\\loging.log
log4j.appender.file.MaxFileSize=1MB
log4j.appender.file.MaxBackupIndex=1
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

And below is my main spring application class.

import org.apache.log4j.Logger;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;

public class DrawingClass {

    public static void main(String args[])
    {
        //without dependency injection 
        /*Triangle t1 = new Triangle();
        t1.draw();*/


        //with dependency injection     
        BeanFactory factory = new XmlBeanFactory(new FileSystemResource("Spring.xml"));
        Triangle t1 =(Triangle) factory.getBean("triangle");
        t1.draw();
    }
}

Please advise if I want to put the log.info in my above main class what modifications I need to do in my main class and also please advise what modifications I need to done to call log4j in my main class?

come up with this solution and it works ..the edited log4j.properties file is

### direct messages to file or.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=C:/logs/s.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1} - %m%n
log4j.appender.file.append=true

### set log levels - for more verbose logging change 'info' to 'debug' ##
log4j.rootCategory=ALL, file
log4j.logger.Demo=\=debug
log4j.logger.org.eclipse=debug

and the way to callit from main class is

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;

public class DrawingClass {
     /* Get actual class name to be printed on */
    static final Logger log = Logger.getLogger(DrawingClass.class);
    public static void main(String args[])
    {PropertyConfigurator.configure("log4j.properties");
        //without dependency injection 
        /*Triangle t1 = new Triangle();
        t1.draw();*/

         log.info("Before execution");
        //with dependency injection     
        BeanFactory factory = new XmlBeanFactory(new FileSystemResource("Spring.xml"));
        Triangle t1 =(Triangle) factory.getBean("triangle");
        log.info("Hello this is an info message");
        t1.draw();
         log.info("after object execution");
    }
}

If there is any other better way then please advise .

Answer 1

Can you try adding this line to your class –

public class DrawingClass {

   static final Logger log = Logger.getLogger(DrawingClass.class);

public static void main(String args[])
{
    //without dependency injection 
    /*Triangle t1 = new Triangle();
    t1.draw();*/

    log.info("Before execution");
    //with dependency injection     
    BeanFactory factory = new XmlBeanFactory(new FileSystemResource("Spring.xml"));
    Triangle t1 =(Triangle) factory.getBean("triangle");
    t1.draw();
}
 }

Now let me know if anything gets added to the log.

This link might help you – http://www.dzone.com/tutorials/java/log4j/sample-log4j-properties-file-configuration-1.html