Putting logger in alfresco

Many times we need to observe certain custom things to be logged.
To enable logger we need to change log4j.properties which is located in alfresco at following location:

Location : <alfresco_home>/tomcat/webapps/alfresco/WEB-INF/classes/log4j.properties

Let say we have packages which is starting with like  com.company.projectx
then make an entry at last to log4j.properties like "log4j.logger.com.company.projectx=debug"

and inside java class do following :

public class CustomClass
{
 private static final Log LOGGER = LogFactory.getLog(CustomClass.class);
  protected processNode()
 {
               LOGGER.debug(" INSIDE processNode method "); 
        }
}