# Root logger option
log4j.rootLogger=DEBUG, stdout, file

# Redirect log messages to console
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

# Redirect log messages to a log file, support file rolling.
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=D:\WorkSpace\ToDoList\src\log\log4j-application.log
log4j.appender.file.MaxFileSize=5MB
log4j.appender.file.MaxBackupIndex=10
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

import org.apache.log4j.Logger;

@WebServlet("/Login")
public class LoginApp extends HttpServlet {
    private static final long serialVersionUID = 1L;

    private final static Logger logger = Logger.getLogger(LoginApp.class);
    private HttpSession session = null;
    private String username;
    private String password;
    private User user;
    private List<Item> items = null;
    private final static HibernateToDoListDao actions = HibernateToDoListDao.getInstance();

    public LoginApp()
    {
        super();
    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException
    {
        username = request.getParameter("username");
        password = request.getParameter("password");

        try
        {
            if(actions.authenticate(username, password) == true)
            {
                logger.info("The user: "+ username+" connect to app.");
                session = request.getSession();
                user = new User();
                user = actions.getUser(username);
                session.setAttribute("user", user);
                items = actions.getItems(username);
                session.setAttribute("listItem", items);
                request.getRequestDispatcher("Index.jsp").forward(request, response);
            }
            else
            {
                logger.error("The authenticate fail.");
                response.sendRedirect("error.jsp");
            }
        }
        catch(ToDoListDaoException e)
        {
            System.out.println(e.getMessage());
        }
    }

2017-01-14 17:14:29 DEBUG AbstractBatcher:418 - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
2017-01-14 17:14:29 DEBUG TwoPhaseLoad:131 - resolving associations for [model.User#1]
2017-01-14 17:14:29 DEBUG TwoPhaseLoad:239 - done materializing entity [model.User#1]
2017-01-14 17:14:29 DEBUG StatefulPersistenceContext:892 - initializing non-lazy collections
2017-01-14 17:14:29 DEBUG ConnectionManager:427 - aggressively releasing JDBC connection
2017-01-14 17:14:29 DEBUG ConnectionManager:464 - releasing JDBC connection [ (open PreparedStatements: 0, globally: 0) (open ResultSets: 0, globally: 0)]
2017-01-14 17:14:29 INFO  LoginApp:50 - The user: tal111s connect to app.
2017-01-14 17:14:29 DEBUG SessionImpl:257 - opened session at timestamp: 14844068691
2017-01-14 17:14:29 DEBUG QueryTranslatorImpl:272 - parse() - HQL: from model.User where username = :username
2017-01-14 17:14:29 DEBUG AST:291 - --- HQL AST ---