LOG4J

public class a{

    private static final Logger logger = Logger.getLogger(a.class);

    public void testLog(){
           
        SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
        try {
              sdf.parse("");

        } catch (ParseException e) {

             logger.fatal("testLog method log:"+ex.getMessage());  
  
        }

    }

}