Skip to main content

JavaEE 5 (JSF + JPA + EJB3) using Eclipse

Today I will show you how to create Enterprise Application using Java EE 5 and GlassFish.
I will use
- Eclipse 3.5 + WTP
- GlassFish v. 2.1
- JSF Mojarra implementation.
- EJB 3.0.
- JPA Toplink essentials implementation.
- MySQL
No NetBeans or JDeveloper magic involved :)
The prerequirement is:
Add datasource in glassfish. Read this how you can make this here: http://gochev.blogspot.com/2009/10/creating-datasource-in-glassfish-v-21.html

1) First you need to add glassfish in your eclipse.
- Go to Servers View
- Right Click, New
- Choose GlassFish v 2.1 if you dont have glassfish click on Download additional adapters link choose glassfish wait and restart eclipse. Than try again.




2) Create the database

CREATE TABLE `lesson`.`USERS` (
  `id` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
  `username` VARCHAR(45) NOT NULL,
  `password` VARCHAR(45) NOT NULL,
  `name` VARCHAR(45) NOT NULL,
  PRIMARY KEY (`id`)
)
ENGINE = InnoDB;



3) Create EJB project





4) Add persistance.xml file in META-INF folder

<?xml version="1.0" encoding="UTF-8"?>

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.0">

    <persistence-unit name="toursUnit">
     <jta-data-source>lessonMySQL</jta-data-source>
        <class>org.joke.model.User</class>
    </persistence-unit>

</persistence>



5) Create Simple Entity org.joke.model.User

package org.joke.model;

import javax.persistence.Basic;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "USERS")
public class User {

 private Long id;
 private String name;
 private String username;
 private String password;

 @Id
 @GeneratedValue(strategy = GenerationType.IDENTITY)
 public Long getId() {
  return id;
 }

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

 @Basic
 public String getName() {
  return name;
 }

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

 @Basic
 public String getUsername() {
  return username;
 }

 public void setUsername(String username) {
  this.username = username;
 }

 @Basic
 public String getPassword() {
  return password;
 }

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

 

}


6) Create HelloService EJB that will use EntityManager

- The local interface is:
package org.joke.service;
import javax.ejb.Local;

import org.joke.model.User;

@Local
public interface HelloService {
 public User login(String username,String password);
}


-The implementation is:

package org.joke.service;

import java.util.List;

import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

import org.joke.model.User;

/**
 * Session Bean implementation class HelloServiceImpl
 */
@Stateless
public class HelloServiceImpl implements HelloService {

 @PersistenceContext(unitName = "toursUnit")
 EntityManager em;

 public HelloServiceImpl() {
 }

 @Override
 public User login(String username, String password) {
  Query query = em
    .createQuery("select u from User u where u.username = :username and u.password = :password");
  query.setParameter("username", username);
  query.setParameter("password", password);
  
  List<User> result = query.getResultList();
  
  if (result != null && result.size() > 0) {
   return result.get(0); //first user
  }
  return null;
 }

}


7) Create Dynamic Web Project





8) Add JSF to this Dynamic Web Project

- Edit web.xml and add FacesServlet
 <servlet>
  <display-name>FacesServlet</display-name>
  <servlet-name>Faces Servlet</servlet-name>
  <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
  <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
  <servlet-name>Faces Servlet</servlet-name>
  <url-pattern>*.jsf</url-pattern>
 </servlet-mapping>


9) I will use a very simple login form (login.jsp) and home.jsp where you will go if login is successfull.

<?xml version="1.0" encoding="UTF-8" ?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page"
 xmlns:f="http://java.sun.com/jsf/core"
 xmlns:h="http://java.sun.com/jsf/html" version="2.1">
 <jsp:directive.page language="java"
  contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" />
 <jsp:text>
  <![CDATA[ <?xml version="1.0" encoding="UTF-8" ?> ]]>
 </jsp:text>
 <jsp:text>
  <![CDATA[ <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> ]]>
 </jsp:text>
 <html xmlns="http://www.w3.org/1999/xhtml">
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
 <title>Hello JSF Page</title>
 </head>
 <body>
 <f:view>
  <h:messages style="color:red;"></h:messages>
  <h:form id="loginForm">
   <table>
    <tr>
     <td align="right"><h:outputText value="Username: " /></td>
     <td><h:inputText id="username"
      value="#{userBean.currentUser.username}" required="true">
      <f:validateLength maximum="10" minimum="3" />
     </h:inputText></td>
     <td><h:message for="username" style="color:red;" /></td>
    </tr>
    <tr>
     <td align="right"><h:outputText value="Password: " /></td>
     <td><h:inputSecret id="password"
      value="#{userBean.currentUser.password}" required="true" /></td>
     <td><h:message for="password" style="color:red;" /></td>
    </tr>
    <tr>
     <td colspan="3"><h:commandButton value="login"
      action="#{userBean.login}" /></td>
    </tr>
   </table>


  </h:form>
 </f:view>
 </body>
 </html>
</jsp:root>


- The home.jsp looks like this:

<?xml version="1.0" encoding="UTF-8" ?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page"
 xmlns:f="http://java.sun.com/jsf/core"
 xmlns:h="http://java.sun.com/jsf/html" version="2.1">
 <jsp:directive.page language="java"
  contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" />
 <jsp:text>
  <![CDATA[ <?xml version="1.0" encoding="UTF-8" ?> ]]>
 </jsp:text>
 <jsp:text>
  <![CDATA[ <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> ]]>
 </jsp:text>
 <html xmlns="http://www.w3.org/1999/xhtml">
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
 <title>Hello JSF Page</title>
 </head>
 <body>
 <f:view>
   Welcome user 
  
 </f:view>
 </body>
 </html>
</jsp:root>



- and faces-config.xml looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<faces-config xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
      http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd"
 version="1.2">
 <navigation-rule>
  <from-view-id>/login.jsp</from-view-id>
  <navigation-case>
   <from-outcome>success</from-outcome>
   <to-view-id>/home.jsp</to-view-id>
  </navigation-case>
 </navigation-rule>
 
 <managed-bean>
  <managed-bean-name>userBean</managed-bean-name>
  <managed-bean-class>mbeans.UserBean</managed-bean-class>
  <managed-bean-scope>session</managed-bean-scope>
 </managed-bean>
</faces-config>


-The UserBean source is:

package mbeans;

import javax.ejb.EJB;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;

import org.joke.model.User;
import org.joke.service.HelloService;

public class UserBean {
 private User currentUser = new User();
 @EJB
 private HelloService helloService ;

 public void setCurrentUser(User currentUser) {
  this.currentUser = currentUser;
 }

 public User getCurrentUser() {
  return currentUser;
 }

 public String login() {
  User result = helloService.login(currentUser.getUsername(),
    currentUser.getPassword());
  if (result!=null) {
   currentUser = result;
   return "success";
  }
  FacesContext.getCurrentInstance().addMessage(
    null,
    new FacesMessage("username and password not found"));
  return null;
 }

}

10) You can notice that I use HelloService and User model class in the Dynamic web project. To do this you have to add the service project as referenced by the web project.
- Right click on the web project and choose Properties

-Go to Build path/Projects

-Add the services project

-Now check the UserBean it should not contain any errors.
11) Create Enterprise Applicatin and add Web and EJB module to this application



12) Right click on the Enterprise Application and choose Run on server.

13) go to http://localhost:8080/HelloWeb/login.jsf and test it :)



That's all.
Note that we did not include any third party jar files in this projects. This is because GlassFish include JSF 1.2 Mojarra implementation and Toplink JPA implementation.

*Update : full source code of the example you can download from: http://dl.getdropbox.com/u/887821/HelloJavaEE5.rar

Comments

Anonymous said…
Very nice write up!

Really shows the basics well to beginners :)

You could trim the code a little here and there. The @Basic annotation for instance isn't required, since it's the default anyway.

In your backing bean (UserBean), I think you should ommit the setter for current user. It's never used and for the purpose of this example you should emphasis it's a read only property.

Also, it might be better to make a distinction between the User instance you use for obtaining the user name and password and the user you get back from your service. Since the UserBean is session scoped, running the login page again will now change the name of the 'current user', which is a somewhat unintentional side-effect of sharing the same user instance for two purposes.
jNayden said…
Thanks for the notes. I totally agree with all that you've explained :) I've created this example just for fast "how to use ear,war and ejb jar" together :) So this was the reason why I make it simple and fast.
All your notes are totally correct.
- to remove the @Basic annotation
- to make distinction between the User instance returned from the service and the current instance :)
- and maybe one note from me:to make the HelpService to be UserService :)

I will update it when I have time thanks for the notes :)
I wish to point out other tutorial for Java EE getting start!

Another approach by using netbeans wizards:
entity bean + session bean + servlet + jsp in a mvc way!

http://programmaremobile.blogspot.com/2009/01/java-ee-how-to-use-ejb-and-web.html
Unknown said…
Hi JOKe,

I would like to know how I can install "MySql Table Editor" to see my database.

Thank you!
jNayden said…
sry I am not using MySQL Table Editor and MySQL Administrator but you can always start mysql from command line to connect to your database and to view all tables.
Unknown said…
Hi JOKe,

I saw in your example at the step 2) "Create the database", the GUI with the title "MySQL Table Editor". Which software is it?

Thank you,
Lan
jNayden said…
Ou :) This is MYSQL Query Browser. It is part of MySQL Gui Tools.. There is a E/R Designer and this called MySQL Query Tools. It it simple too where you can execute all types of queries and there is designer for tables included(which is shown in the screenshot).
So the answer is: MySQL Query Tools, part of MySQL Gui Tools
Unknown said…
Thank you very much!
Shekhar said…
Thank you for this wonderful article. It helped me lot bringing up my own application using technologies mentioned in this article.Content was absolutely right at the point. Keep this good work up.
Thanks once again.

Popular posts from this blog

Hibernate Generic DAO.

When you use Hibernate and DAO pattern it is a good idea to use a Generic Base Dao. The fallowing code snippet contains GenericDAO that is a base class for all my DAO classes. This GenericDAO uses HibernateDaoSupport from Spring for its implementation if you want you can use JpaDaoSupport or JdbcDaoSupport in your projects. My Generic DAO interface looks like this : package org.joke.myproject.dao.base; import java.io.Serializable; import java.util.List; /** * @author Naiden Gochev * @param <E> * @param <PK> */ public interface GenericDao<E,PK  extends Serializable> {     PK save(E newInstance);     void update(E transientObject);     void saveOrUpdate(E transientObject);     void delete(E persistentObject);     E findById(PK id);     List<E> findAll();     List<E> findAllByProperty(String propertyName,Object value); } All method names are very common so I don't

Patching a Maven library with your custom class.

Sometimes you use a library that has a bug. Or maybe it doesn’t has a bug but you want to change something. Of course if it is an open source you can get the sources… build them … with your change and so on. However this first takes a lot of time and second you need the sources. What you usually want .. is to just replace one class.. or few classes with something custom… maybe add a line .. or remove a line and so on. Yesterday… I had an issue with jboss-logging. The version I was using was 3.2.0Beta1 and it turns out that using this version and log4j2 2.0 final basically meant that no log is send to log4j2. The reason was a null pointer exception that was catched in jboss logging class called Log4j2Logger. The bug I submitted is here https://issues.jboss.org/browse/JBLOGGING-107 and it was fixed at the same day. However I will use it as an example since I didn’t knew when this will be fixed.. and I didn’t want to wait till it is fixed. So I was thinking what I want.. to take the j

Use Multiple JVM versions on Mac OS and Linux

Linux Download multiple Java versions and put them into /opt/ If you already have some JDK from ubuntu repo or etc not a big deal, just fix the paths bellow Register them as alternatives sudo update-alternatives --install /usr/bin/java java /opt/java-8-oracle/bin/java 1081 sudo update-alternatives --install /usr/bin/java java /opt/sap-machine-jdk-11.0.3/bin/java 1080 Edit your ~/.bashrc file alias java11='sudo update-alternatives --set java /opt/sapmachine-jdk-11.0.3/bin/java;export JAVA_HOME=/opt/sapmachine-jdk-11.0.3/' alias java8='sudo update-alternatives --set java /opt/java-8-oracle/bin/java;export JAVA_HOME=/usr/lib/java-8-oracle/' SAVE and start a new bash terminal execute java8 to use java8 java11 to use java11 the latest version you have set stays as system wide, but the JAVA_HOME is not :( you can put java8 or java11 as a last line in the bashrc but since it is sudo it will always require password when start and is not gr