Server has trouble finding .class for entity

[Diego Miranda]

Hi guys/gals!!
I've just finished a course on Web Application development so please bear with me hehe.
I've developed a reaaaaly simple enterprise application using Eclipse Helios (64 bit), Glassfish v3, Postgres 8.4, with JPA 2.0, EJB3.0, Struts, EclipseLink2.1
The app consists of:

- A simpe jsp file (called AltaUsuario.jsp) that consist of a simpe form with only one field

<html:form action="RegisterUser.do">
	Username: <html:text property="username"></html:text>
	<html:submit></html:submit>
</html:form>

- The corresponding ActionForm for the jsp
- The corresponding Action (called RegisterServiceAction)

public class RegisterServiceAction extends Action{
	@EJB RegisterServiceRemote service;
	
	public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception{
		AltaUsuarioForm usuarioForm = (AltaUsuarioForm)form;
		
		service = new RegisterService();
		service.registerUser(usuarioForm.getUsername());
		return mapping.findForward("OK");
	}
}

- A sessionbean called RegisterService

@Stateless
public class RegisterService implements RegisterServiceRemote, RegisterServiceLocal {
	@PersistenceContext private EntityManager em;
    /**
     * Default constructor. 
     */
    public RegisterService() {
        // TODO Auto-generated constructor stub
    }

	@Override
	public void registerUser(String username) {

		UserProfile user = new UserProfile(username);
		em.persist(user);
	}

}

- A entity called UserProfile

@Entity
public class UserProfile implements Serializable {

	
	private static final long serialVersionUID = 1L;
   
	@Id
	private String username;
	
	public UserProfile() {
		super();
	}   
  
	public String getUsername() {
		return this.username;
	}

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

- My persistence.xml file looks like this

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
	<persistence-unit name="PruebaJPAJPA">
		<class>prueba.entity.UserProfile</class>
		<properties>
			<property name="eclipselink.ddl-generation" value="drop-and-create-tables"/>
			<property name="eclipselink.ddl-generation.output-mode" value="both"/>
			<property name="eclipselink.application-location" value="D:\borrar"/>
		</properties>
	</persistence-unit>
</persistence>

The structure that eclipse deploys in the server is as follows

PruebaJPA (root)
|_____> META-INF (directory)
|_____> PruebaJPAEJB_jar (directory)
|_____> PruebaJPAJPA.jar (directory)
|_____> PruebaJPAWeb_war (directory)
|___> eclipselink.jar (file)
|___> javax.persistence_2.0.1.v201006031150.jar (file)

The error that shows me is the following:

HTTP Status 500 -

type Exception report

message

descriptionThe server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.NoClassDefFoundError: prueba/entity/UserProfile

note The full stack traces of the exception and its root causes are available in the GlassFish Server Open Source Edition 3.0.1 logs.
GlassFish Server Open Source Edition 3.0.1

But if I look into the PruebaJPAJPA.jar directory I can see that the .class is in there

Could anyone give me a hand with this?
pleeeaaseeee, I'm going nuts (even read the Specs for JavaEE 6.0 trying to solve this problem)

Thanks in advance for any help/tip that I can use!!!
Cheers!
Dieguinho

[Diego Miranda]

Sorry, maybe its better suited for the JPA forum
if someone can please move it...