How to design using J2EE pattern?

Question

I am new to J2EE and I would like some ideas on how I should design the following system in J2EE pattern. I am required to use JSP pages + EJB to implement a very simple online shopping system. And I already created the following classes:
This is the EJB object interface.
package assignment;
import java.rmi.*;
import javax.ejb.*;
import java.util.Vector;
public interface ShoppingSystem extends EJBObject {
     public boolean LoginAsCust(String id,String pwd) throws RemoteException;
     public boolean LoginAsAdmin(String id,String pwd) throws RemoteException;
     public Vector getMusicCategories() throws RemoteException;
     public Vector getCategoryItems(String category) throws RemoteException;
     public MusicRecording getMusicRecording(String id) throws RemoteException;
}This is the home interface.
package assignment;
import java.rmi.*;
import javax.ejb.*;
public interface ShoppingSystemHome extends EJBHome {
     public ShoppingSystemHome create() throws RemoteException, CreateException;
}This is the session bean objects.
package assignment;
import java.rmi.*;
import javax.ejb.*;
import java.util.Vector;
public class ShoppingSystemBean implements SessionBean {
     // data item to hold a reference to a passed Session context
     private SessionContext ctx;
     // save the session context
     public void setSessionContext(SessionContext x) { ctx = x;}
     // the various method implementations
     // imposed on us by interface
     public void ejbCreate() {}
     public void ejbActivate() {}
     public void ejbPassivate() {}
     public void ejbRemove() {}
     public boolean LoginAsCust(String id,String pwd) throws RemoteException{
     public boolean LoginAsAdmin(String id,String pwd) throws RemoteException{
     public Vector getMusicCategories() throws RemoteException{
     public Vector getCategoryItems(String category) throws RemoteException{
public MusicRecording getMusicRecording(String id) throws RemoteException{
}I will probably need to create a shopping cart class and a database accessor class. What I would like to know is , do I need to divide the shopping cart class into three components: Home interface, EJB object interface, SessionBean object.
Please give me some ideas on how I can develop this system using EJB. (This is just a school assignment)
Thanks.

Answer 1

know is , do I need to divide the shopping cart class
into three components: Home interface, EJB object
interface, SessionBean object.Shopping cart is a typical example of a stateful session bean. So you need to write a session bean. And, of course, every session bean consists of three things: remote interface, home interface and bean class.
Please give me some ideas on how I can develop this
system using EJB. (This is just a school assignment)In this case you can tell them to fuk off.