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how to handle session in EJB

Samanthi perera

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posted 14 years ago

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I make a small loging application using ejb

this is loging jsp

this is userAuthorise servlet

package my;

import ejbs.EmployeeFacadeLocal;
import entity.Employee;
import java.io.IOException;
import java.io.PrintWriter;
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class userAuthorise extends HttpServlet {
    @EJB
    private EmployeeFacadeLocal employeeFacade;
   
   
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
           
            String name=request.getParameter("name");
            String password=request.getParameter("password");

Employee e=employeeFacade.find(name);
          if(password.equals(e.getPassword()));
          {
              out.println("user authenticatedddddddddddddddddddddd");
          }

} finally { 
            out.close();
        }
    }

// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

/** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

/** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}

this is sessionbean

this is entitybean

package entity;

import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;

@Entity
@Table(name = "employee")
@NamedQueries({@NamedQuery(name = "Employee.findAll", query = "SELECT e FROM Employee e"), @NamedQuery(name = "Employee.findByName", query = "SELECT e FROM Employee e WHERE e.name = :name"), @NamedQuery(name = "Employee.findByPassword", query = "SELECT e FROM Employee e WHERE e.password = :password")})
public class Employee implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "name")
    private String name;
    @Column(name = "password")
    private String password;

public Employee() {
    }

public Employee(String name) {
        this.name = name;
    }

public String getName() {
        return name;
    }

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

public String getPassword() {
        return password;
    }

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

@Override
    public int hashCode() {
        int hash = 0;
        hash += (name != null ? name.hashCode() : 0);
        return hash;
    }

@Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Employee)) {
            return false;
        }
        Employee other = (Employee) object;
        if ((this.name == null && other.name != null) || (this.name != null && !this.name.equals(other.name))) {
            return false;
        }
        return true;
    }

@Override
    public String toString() {
        return "entity.Employee[name=" + name + "]";
    }

}

This application work fine.
No problem.
Anyway i need to know how to add session to this application.
Is it add to servlet or Ejb?
if it should EJB ,HOW?

Paul Sturrock

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posted 14 years ago

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Not sure what "add sessioN" means, but you can choose to use an HTTP session or an EJB session as your needs require. Which one do you need?

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Samanthi perera

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sesion mean conversional state.
or session mean i need to identify user when his made a second request that this is a his second request?
how can i archieve this using EJB?
I know how to do this using Servlets.

Paul Sturrock

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Use a stateful session bean.

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Ravi Kiran Va

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The HTTPSession on to the JSP Page will be taken by the EJB Container and it will be rresponsible to maintain the Session in case of the Statefull Session Bean .

What Paul mentioned is right , use Statefull Session Bean

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ramprasad madathil

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use Statefull Session Bean

You would still need a session (or the equivalent of it) on the client to store a Handle to the stateful session bean.

ram.

Samanthi perera

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In this example i used Entity beans for Persistance.
I read that Entity beans are the worst part of EJB3.SO can we replace the Entity beans with Anyother thing?

Jaikiran Pai

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Samanthi perera wrote:
I read that Entity beans are the worst part of EJB3.SO can we replace the Entity beans with Anyother thing?

Where did you read that? As I said in another post, there are no entity *beans* in EJB3. They are just entities. And I have never heard that they are the worst part of EJB3. EJB2.x entity beans, yes, that's a different story.

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Jaikiran Pai

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In this example i used Entity beans for Persistance.

By the way, how is that related to the original question that you started off with in this topic?

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Krum Bakalsky

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In this example i used Entity beans for Persistance.

Nope, you are wrong! You are not using entity beans at all! What you use, is called "entities", not entity beans.
Please put some effort to use the proper terminology.
Entity beans are EJB 2.1 legacy, and are managed by the EJB container (so they really are type of EJBs)
Entities are a JPA artifact, and they are not managed by the EJB container, but by the JPA provider instead (so they are not EJBs at all)

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