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我有一个bean UserControl，SessionScope在系统用户之后register，他/她会尝试登录系统，对吗？

使用相同的bean，但是在第二次尝试登录一次（例如使用错误的密码）后，出现我的bean的异常null，为什么？

我在 and 使用composition相同register form的login form：

<!DOCTYPE html>
<ui:composition
    xmlns="http://www.w3.org/1999/xhtml" 
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html" 
    xmlns:ui="http://java.sun.com/jsf/facelets">

    E-Mail:<h:message id="m_email" for="email" styleClass="red" /><br/>
    <h:inputText id="email" value="#{userC.user.email}" maxlength="45" validatorMessage="e-mail inválido" >
        <f:validateLength minimum="6" maximum="45" />
        <f:ajax event="blur" render="m_email" />
    </h:inputText>
    <br/>
</ui:composition>

第一次工作，但第二次，不要。给我这个例外：

/resources/jsf/composition/body/user/form/email.xhtml @9,108 value="#{userC.user.email}": Target Unreachable, 'null' returned null

这是我的豆子，UserControl：

@ManagedBean(name="userC")
@SessionScoped
public class UserControl  implements Serializable{
    private static final long serialVersionUID = 7708365499838642904L;

    @EJB UserEAO userEAO;
    @EJB AddressEAO addressEAO;

    private User user;

    private Message message;

    /*
     * Variable
     */
    private boolean logged;

    public UserControl(){
        user = new User();
        user.setAddressCity(new AddressCity());
        user.setAddressState(new AddressState());
        user.setAddressCountry(new AddressCountry());

        logged = false;
    }
  .. methods
}

是错误的启动我objects的constructor吗？

更新 完整代码UserControl：

package com.hi.mvc.controller;

import java.io.IOException;
import java.io.Serializable;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.ejb.EJB;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;

import com.hi.mvc.eao.AddressEAO;
import com.hi.mvc.eao.UserEAO;
import com.hi.mvc.model.AddressCity;
import com.hi.mvc.model.AddressCountry;
import com.hi.mvc.model.AddressState;
import com.hi.mvc.model.User;
import com.hi.utility.Crypto;
import com.hi.utility.Email;
import com.hi.utility.Message;

@ManagedBean(name="userC")
@SessionScoped
public class UserControl  implements Serializable{
        private static final long serialVersionUID = 7708365499838642904L;

        @EJB UserEAO userEAO;
        @EJB AddressEAO addressEAO;

        private User user;

        private Message message;

        /*
         * Variable
         */
        private boolean logged;

        public UserControl(){
                user = new User();
                user.setAddressCity(new AddressCity());
                user.setAddressState(new AddressState());
                user.setAddressCountry(new AddressCountry());

                logged = false;
        }

        /*
         * CRUD
         */
        public String register(){
                if (userEAO.find(user.getEmail()) == null){
                        defineUser();

                        message = userEAO.create(user);
                        //sending user email confirmation
                        if (message.getCode() == 0) {
                                message = new Message(1);
                                message.setEmail(user.getEmail());

                                sendConfirmationEmail(user);
                                return "/pages/system/message.xhtml?faces-redirect=true";
                        }else
                                //user already registered and trying to register again
                                message = new Message(-1002);
                }

                addMessage();
                return null;
        }

        public String update() {
                message = userEAO.update(user);

                this.addMessage();
                return null;
        }

        public String delete(){
                message = userEAO.delete(user);
                if (message.getCode() >= 0)
                try {
                        ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext();
                        ec.invalidateSession();

                        message = new Message(3001);
                        addMessage();

                        ec.redirect(ec.getRequestContextPath() + "/pages/system/message.xhtml");
                } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }
                addMessage();
                return null;
        }

        /*
         *  Log in/off
         */
        public String login(){
                String password = user.getPassword();
                user = userEAO.find(user.getEmail());
                // if user was found
                if ( user != null ){
                        if ( user.getEmailConfirmed()){
                                // with facebook registration, password is empty, so we avoid login empty and check the password
                                if ( !user.getPassword().isEmpty() && Crypto.check(password, user.getPassword())){
                                        //user = addressEAO.findByUser(user.getId());
                                        logged = true;

                                        return "/index.xhtml?faces-redirect=true";
                                }else
                                        message = new Message(-2000);

                        }else
                                message = new Message(-1003);
                }else
                        message = new Message(-2000);

                addMessage();
                return null;
        }

        public void logout(){
                try {
                        ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext();
                        ec.invalidateSession();
                        ec.redirect(ec.getRequestContextPath() + "/index.xhtml");
                } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }
        }

        /*
         * Functions
         */
        public void defineUser(){
                encryptPassword(user);
                user.setMemberSince(new Date());
                user.setAcceptanceRate(0);
                user.setResponseRate(0);

                // user do not confirm email yet
                user.setEmailConfirmed(false);

                // set address to be empty
                user.getAddressCity().setCity(" ");
                user.getAddressState().setState(" ");
                user.getAddressCountry().setCode(" ");
                defineAddress();
        }

        public void defineAddress(){
                AddressCity addressCity = addressEAO.findCity(user.getAddressCity().getCity());
                if (addressCity == null){
                        addressCity = new AddressCity();
                        addressCity.setCity(user.getAddressCity().getCity());
                        addressEAO.createCity(addressCity);
                }
                user.setAddressCity(addressCity);

                AddressState addressState = addressEAO.findState(user.getAddressState().getState());
                if (addressState == null){
                        addressState = new AddressState();
                        addressState.setState(user.getAddressState().getState());
                        addressEAO.createState(addressState);
                }
                user.setAddressState(addressState);

                AddressCountry addressCountry = addressEAO.findCountry(user.getAddressCountry().getCode());
                if (addressCountry == null){
                        addressCountry = new AddressCountry();
                        addressCountry.setCode(user.getAddressCountry().getCountry());
                        addressEAO.createCountry(addressCountry);
                }
                user.setAddressCountry(addressCountry);
        }

        /*
         * Date
         */
        public Date convertDate(String date){
                try {
                        DateFormat formatter = new SimpleDateFormat("MM/dd/yy");  
                        return (Date)formatter.parse(date);
                } catch (ParseException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }
                return null;
        }

        /*
         * E-Mail
         */
        public void sendConfirmationEmail(User u){
                Email email = new Email();
                email.setUser(u);
                email.setSubject("Hotel Informal - Por favor, confirme seu endereço de email");
                email.simpleEmail();
        }

        public void sendWelcomeEmail(User u){
                Email email = new Email();
                email.setUser(u);
                email.setSubject("Hotel Informal - Olá, seja bem-vindo(a)");
                email.simpleEmail();
        }

        public String resendEmailConfirmation(){
                sendConfirmationEmail(user);
                message = new Message(2);
                message.setEmail(this.user.getEmail());

                return "/pages/system/message.xhtml?faces-redirect=true";
        }

        /*
         * Password
         */
        public void encryptPassword(User u) {
                if (u.getPassword() != null){
                        u.setPassword(Crypto.encrypt(u.getPassword()));
                }
        }

        public String changePassword(){
                encryptPassword(user);
                message = userEAO.update(user);
                if (message.getCode() >= 0)
                        message = new Message(2002);

                addMessage();
                return null;
        }

        public Message checkPassword(User user) {
                if (user == null)
                        return new Message(-3000);

                if (Crypto.check(user.getPassword(), user.getPassword())) {
                        return new Message(1);
                } else
                        return new Message(-2000);
        }

        public String forgotPassword(){
                user = userEAO.find(user.getEmail());
                if (user != null){
                        Email email = new Email();
                        email.setUser(user);
                        email.setSubject("Hotel Informal - Redefinir senha");
                        email.simpleEmail();

                        message = new Message(6);
                        message.setEmail(user.getEmail());
                }else
                        message = new Message(-1004);

                addMessage();
                return "/pages/system/message.xhtml?faces-redirect=true";
        }       

        public String resetPassword(){
                encryptPassword(user);
                userEAO.update(user);

                Email email = new Email();
                email.setUser(user);
                email.setSubject("Hotel Informal - Senha redefinida");
                email.simpleEmail();

                message.setEmail(user.getEmail());
                message = new Message(2001);

                addMessage();
                return "/pages/system/message.xhtml?faces-redirect=true";
        }

        private void addMessage(){
                FacesMessage fMessage = new FacesMessage(message.getMessage());
                FacesContext.getCurrentInstance().addMessage(null, fMessage);
        }

        // get's & set's

        public Message getMessage() {
                return message;
        }

        public void setMessage(Message message) {
                this.message = message;
        }

        public User getUser() {
                return user;
        }

        public void setUser(User user) {
                this.user = user;
        }

        public boolean isLogged() {
                return logged;
        }

        public void setLogged(boolean logged) {
                this.logged = logged;
        }


}
4

1 回答 1

0

遵循 and 的建议maple_shaft并kolossun不足以解决我的问题，但遵循这个建议，检查方法中的isuser是否是。nullpublic User getUser()

@PostConstruct
public void init(){
    if (user == null){
        user = new User();
        logged = false;
    }

    if (user != null && user.getAddressCity() == null)
        user.setAddressCity(new AddressCity());

    if (user != null && user.getAddressState() == null)
        user.setAddressState(new AddressState());

    if (user != null && user.getAddressCountry() == null)
        user.setAddressCountry(new AddressCountry());
}

和 ：

public User getUser() {
    init();
    return user;
}

通过这种方式，我确保user始终初始化对象和其他类。我仍然不明白为什么null办理登机手续@PostConstruct还不够，它一直给我同样的错误。

于 2013-04-15T23:27:40.817 回答