[JSF2]Projekt i błędy

package com.jsfcourse.security;

import javax.ejb.EJB;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpSession;
//import java.util.Date;


import com.jsf.dao.GraczDAO;
import com.jsf.entities.Gracz;

@ManagedBean
public class LoginBB {
	private static final String PAGE_MAIN = "index.jsf";
	private static final String PAGE_LOGIN = "gracz.jsf?faces-redirect=true";
	private static final String PAGE_STAY_AT_THE_SAME = null;
	@EJB
	GraczDAO graczDAO;

	private String nazwa;
	private String haslo;



	public String getNazwa() {
		return nazwa;
	}

	public void setNazwa(String nazwa) {
		this.nazwa = nazwa;
	}

	public String getHaslo() {
		return haslo;
	}

	public void setHaslo(String haslo) {
		this.haslo = haslo;
	}



	public boolean validateData() {
		boolean result;
		FacesContext ctx = FacesContext.getCurrentInstance();

		// check if not empty
		if (nazwa == null || nazwa.length() == 0) {
			ctx.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR,
					"Musisz podać nazwę gracza", "null"));
		}

		if (haslo == null || haslo.length() == 0) {
			ctx.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR,
					"Musisz podać hasło ", "null"));
		}
	
		if (ctx.getMessageList().isEmpty()) {
			result = true;
		} else {
			result = false;
		}
		return result;

	}

	public String doLogin() {
		FacesContext ctx = FacesContext.getCurrentInstance();
		Gracz gracz = null;

		// 1. check parameters and stay if errors
		if (!validateData()) {
			return PAGE_STAY_AT_THE_SAME;
		}

		// 2. verify login and password - get User from "database"
		gracz = getUserFromDatabase(nazwa, haslo);

		// 3. if bad login or password - stay with error info
		if (gracz == null) {
			ctx.addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR,
					"Niepoprawny login lub hasło", null));
			return PAGE_STAY_AT_THE_SAME;
		}
	

		// 4. if login ok - save User object in session
		HttpSession session = (HttpSession) ctx.getExternalContext()
				.getSession(true);
		session.setAttribute("Gracz", gracz);

		// and enter the system
		return PAGE_LOGIN;
	}

	public Gracz getGracz() {
		HttpSession session = (HttpSession) FacesContext.getCurrentInstance()
				.getExternalContext().getSession(true);
		return (Gracz) session.getAttribute("Gracz");
	}
	
	public String doLogout(){
		HttpSession session = (HttpSession) FacesContext.getCurrentInstance()
				.getExternalContext().getSession(true);
		//Invalidate session
		// - all objects within session will be destroyed
		// - new session will be created (with new ID)
		session.invalidate();
		return PAGE_MAIN;
	}
	
	// simulate finding user in database
	private Gracz getUserFromDatabase(String nazwa, String haslo) {
		Gracz g = null;

		if (nazwa.equals("nazwa") && haslo.equals("haslo")) {
			g = new Gracz(nazwa, haslo);
			g.setNazwa("nazwa");
		//	g.setOstatniWynik("#{gracz.ostatniWynik}");

			// assumed system roles
		/*	g.getRoles().add("role1");
			g.getRoles().add("role2");
			g.getRoles().add("admin");*/
		}

		return g;
	}

}