log warning messages

[sudheer kiran]

i get these messages in every execution.
log4j:WARN No appenders could be found for logger (hb.dao.PersonDAO).
log4j:WARN Please initialize the log4j system properly.

what would be the cause.
my code snippet

    
import org.apache.log4j.Logger;
import util.BaseHibernateDAO;
public class PersonDAO extends BaseHibernateDAO{
	private final Logger log = Logger.getLogger(PersonDAO.class);
			public void attachDirty(Person  instance) {
				log.debug("attaching dirty Students instance");

[Christian Dillinger]

That's not a problem for "Object Relational Mapping". As you can see it's a warning from log4j that you should configure log4j properly. So, have a look at the log4j-website how to do that.

[Paul Sturrock]

Indeed. I'll move this to a more appropriate forum.

[Cameron Wallace McKenzie]

Remember, they're just warnings. They are not errors, and they won't stop your program from running.

-Cameron McKenzie