Close session of the user using primefaces and Hibernate

Question

I need when I click on "Log out" to close the session of the user connected, so for That I was thinking about improving my bean and improving my closeSession() method which I will invoke it when I click on "Log out".

this is my profile.xhtml :

<h:html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:f="http://java.sun.com/jsf/core"      
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:p="http://primefaces.org/ui">
<h:head>

</h:head>
<h:body>
<div>
      <h:form>
        <p:row>
            <p:column>
                    <p:menuButton value="#{user.name}">
                        <p:menuitem value="log out" action="#{user.closeSession}"/>
                    </p:menuButton>
            </p:column>
        </p:row>
      </h:form>
</div>

</h:body>
</h:html>

This is my Bean User :

@ManagedBean(name="user")
@RequestScoped
public class User {

    private int id;
    private String name;
    @Column(unique=true)
    private String email;
    private String password;
    private String confirmationPass;
//  private image 


    public User() {
        super();
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }


    public String getConfirmationPass() {
        return confirmationPass;
    }

    public void setConfirmationPass(String confirmationPass) {
        this.confirmationPass = confirmationPass;
    }


    public User(int id, String name, String email, String password,
            String confirmationPass) {
        super();
        this.id = id;
        this.name = name;
        this.email = email;
        this.password = password;
        this.confirmationPass = confirmationPass;
    }

    public User(int id, String name, String email, String password) {
        super();
        this.id = id;
        this.name = name;
        this.email = email;
        this.password = password;
    }

    public User(String name, String email, String password) {
        super();
        this.name = name;
        this.email = email;
        this.password = password;
    }

    @Override
    public String toString() {
        return "User [id=" + id + ", Name=" + name + ", email=" + email
                + ", password=" + password + "]";
    }

    public String save(){


        UserBusiness userBusiness = new UserBusinessImp();
        userBusiness.add(new User(name, email,password));

        return "profile";

    }

    public void closeSession(){

    //I would like to close the session of the user when he click on Log out

    }

And my business Layer consitute of :

UserBusiness interface :

public interface UserBusiness {

    **public void add(User user);**
}

And UserBusinessImp which implements UserBusiness interface :

public class UserBusinessImp implements UserBusiness{

    public void add(User user) {
        UserDao userDao = new UserDaoMysql();
        userDao.insert(user);
    }
}

And DAO layer constitute of :

UserDao interface :

public interface UserDao {

    public void insert(User user);
}

And UserDaoMysql class which implements UserDao interface :

public class UserDaoMysql implements UserDao {

    private Session session;


    private void openSession(){
        SessionFactory sessionFactory=HibernateUtil.getSessionFactory();
        session = sessionFactory.openSession();
        session.beginTransaction();
    }

    private void closeSession(){
        session.getTransaction().commit();
        session.close();
    }

    public void insert(User user) {

        try {
        openSession();
        User p = new User(user.getName(), user.getEmail(), user.getPassword());
        session.save(p);
        System.out.println("sauvegarde reussi");
        closeSession();
        } 
        catch (ConstraintViolationException e) {
            System.out.println("> email is already used");
            FacesMessage msg = new FacesMessage("Your email is already used !");  
            FacesContext.getCurrentInstance().addMessage(null, msg);
        }
    }
}

This is one class util which called HibernateUtil :

public class HibernateUtil {

    private static SessionFactory sessionFactory = buildSessionFactory();
    private static ServiceRegistry serviceRegistry;

    private static SessionFactory buildSessionFactory() {
        try {

             Configuration configuration = new Configuration();
            configuration.configure();
            serviceRegistry = new ServiceRegistryBuilder().applySettings(
                    configuration.getProperties()).buildServiceRegistry();
            sessionFactory = configuration.buildSessionFactory(serviceRegistry);
            return sessionFactory;


        } catch (Throwable ex) {
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }

    public static void shutdown() {
        getSessionFactory().close();
    }
}

Remark : I am using MySQL as a database.

Anyone could help me please ! Thanks in advance.