Download EJB 2 - KSU Web Home

EJB 2.x Stateful Session Bean
Select File  New Project… and then choose the Enterprise category and Enterprise Application
project:
Click Next. Specify a project name and location:
In the ejb module, create three java class files.
Home interface (CartHome)
Remote interface (Cart)
Session bean class (CartBean)
Cart. Java
import java.util.*;
import javax.ejb.EJBObject;
import java.rmi.RemoteException;
public interface Cart extends EJBObject {
public void addItem(String item) throws RemoteException;
public void removeItem(String item) throws RemoteException;
public Vector getCart() throws RemoteException;
}
CartBean.java
import java.util.*;
import javax.ejb.*;
import java.rmi.*;
public class CartBean implements SessionBean {
String name;
Vector cart;
SessionContext sessionContext;
//ejbCreate() is called back by EJB container after clients invoke
//create() method. Some initialization is done here. The main job
//here is to create a vector to hold all shopped items for this cart.
public void ejbCreate(String name)throws CreateException {
if (name == null) {
throw new CreateException("creation failed.");
}
else {
this.name = name;
}
cart = new Vector();
}
//Add an new item to the cart
public void addItem(String item) {
cart.add(item); }
//Remove an existing item from the cart
public void removeItem(String item) throws RemoteException {
boolean result = cart.remove(item);
if (result == false) {
throw new RemoteException("Can't find it");
}
}
//Return this cart
public Vector getCart() {
return cart;
}
public CartBean() {}
public void ejbRemove() {}
public void ejbActivate() {}
public void ejbPassivate() {}
public void setSessionContext(SessionContext sc){
sessionContext = sc;
}
}
CartHome.java
import java.rmi.RemoteException;
import javax.ejb.*;
public interface CartHome extends EJBHome {
public Cart create(String name) throws RemoteException, CreateException;
}
Right click on the Cart-ejb node and choose New-> Other->JaveEE->Standard Deployment
Descriptor
ejb-jar.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN'
'http://java.sun.com/dtd/ejb-jar_2_0.dtd'>
<ejb-jar>
<display-name>Cart-ejb</display-name>
<enterprise-beans>
<session>
<display-name>Cart-ejb</display-name>
<ejb-name>Cart-ejb</ejb-name>
<home>CartHome</home>
<remote>Cart</remote>
<ejb-class>CartBean</ejb-class>
<session-type>Stateful</session-type>
<transaction-type>Bean</transaction-type>
<security-identity>
<description></description>
<use-caller-identity></use-caller-identity>
</security-identity>
</session>
</enterprise-beans>
</ejb-jar>
Redo the above step and Right click on the Cart-ejb node and choose New->
Other->GlassFish->sun- Deployment Descriptor.
sun-ejb-jar.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sun-ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD GlassFish Application Server 3.0
EJB 3.1//EN" "http://www.sun.com/software/appserver/dtds/sun-ejb-jar_3_1-0.dtd">
<sun-ejb-jar>
<enterprise-beans>
<ejb>
<ejb-name>Cart-ejb</ejb-name>
<jndi-name>CartBean</jndi-name>
</ejb>
</enterprise-beans>
</sun-ejb-jar>
In the Cart-app-client module, we should create CartClient.java file
CartClient.java
import java.util.Collection;
import java.util.Iterator;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.rmi.PortableRemoteObject;
public class CartClient {
public static void main(String [] args) throws NamingException {
try {
Context initial = new InitialContext();
Object objref = initial.lookup("CartBean");
CartHome
home
(CartHome)PortableRemoteObject.narrow(objref,CartHome.class);
Cart cart = home.create("Duke");
System.out.println("Adding items to cart");
cart.addItem("Pizza");
cart.addItem("Pasta");
cart.addItem("Noodles");
cart.addItem("Bread");
cart.addItem("Butter");
System.out.println("Listing cart contents");
Collection items = cart.getCart();
for (Iterator i = items.iterator(); i.hasNext();) {
String item = (String) i.next();
System.out.println(" " + item);
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
private static Context getInitialContext() throws NamingException {
return new InitialContext();
=
}
}
Finally, after building and deploying the project, run it.