Java EE (Java Enterprise Edition) General Discussion

Hi ,
Iam developing a enterprise application using netbeans 6 in jEE 5 platform.
I am using glashfish V2 server , mysql database integrating in struts framework.
For business logic I use ejb3.0 component technology.

My application require a login screen ,so I designed using JSP .


I am new to ejb technology .I searched the internet for appropriate example but I cant find it.Hope i will get it here.
I will describe my application FLOW. Action classs-->Business Object-->Business Deligate-->Entity Fa�ade-->Entity-->Database.


I post the code what I have developed .

Action class:
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
LoginBusinessDelegate loginBusinessDelegate = new LoginBusinessDelegate();
LoginActionForm LoginActionForm = (LoginActionForm) form;
LoginBO loginBO = createLoginBO(form);
loginBusinessDelegate.createLogin(loginBO);
}



private LoginBO createLoginBO(ActionForm form) {
LoginBO loginBO = new LoginBO();
LoginActionForm LoginActionForm = (LoginActionForm) form;
loginBO.setUsername(LoginActionForm.getUsername());
loginBO.setPassword(LoginActionForm.getPassword());
return loginBO;


Business Object:

public class LoginBO implements Serializable{


private String username;
private String password;
public LoginBO()
{

}//getters and setters

Business deligate:
public class LoginBusinessDelegate extends BusinessDelegateBase {

public LoginBusinessDelegate() {
}

public void createLogin(LoginBO login) {
try {
LoginEntity loginEntity = new LoginEntity();
LoginAction loginaction=new LoginAction();
loginEntity.setUsername(login.getUsername());
loginEntity.setPassword(login.getPassword());
LoginEntity find = lookupLoginEntityFacade().find(loginEntity);
} catch (Exception e) {
e.printStackTrace();
}
}

private LoginEntityFacadeLocal lookupLoginEntityFacade() {
try {
Context c = new InitialContext();
return (LoginEntityFacadeLocal) c.lookup("java:comp/env/LoginEntityFacade");
�.}




Entity Fa�ade:
public class LoginEntityFacade implements LoginEntityFacadeLocal {

@PersistenceContext
private EntityManager em;

public void create(LoginEntity loginEntity) {
em.persist(loginEntity);
}

public void edit(LoginEntity loginEntity) {
em.merge(loginEntity);
}

public void remove(LoginEntity loginEntity) {
em.remove(em.merge(loginEntity));
}

public LoginEntity find(Object id) {}




Entity:

@Entity
@Table(name = "login")



public class LoginEntity implements Serializable {

private static final long serialVersionUID = 1L;
private String username;
private String password;

@Id
//getters and setters



I can persist data without any problems .But I cant even imagine how to do this:� when the user enters his username and password ,it has to be checked in database , if exists then


return mapping.findForward(SUCCESS);

else
return mapping.findForward(FAILURE);

How to do it.??Where to validate.?? Please help me.
Thank u in advance.