NamingException loading bean with JNDI

I have two stateless EJBs that implement an interface. To load an implementation I'm using InitialContext but it always fails with NamingException.

The interface

package app.ejb.login;

public interface UserValidation {

    public static final int DBValidation = 1;
    public static final int LDAPValidation = 2;

    public int validateUser(String userid, String password) throws InvalidAccessException;

}

The first implementation

package app.ejb.login;

@Stateless
public class LDAPUserValidationImpl implements UserValidation {

    @Override
    public int validateUser(String userid, String password) throws InvalidAccessException {
            ........................
    }

}

and the second implementation

package app.ejb.login;

@Stateless
public class DBUserValidationImpl implements UserValidation {

    @Override
    public int validateUser(String userid, String password) throws InvalidAccessException {
            ..................
    }

}

This is the code that calls the implementation depending on a configuration:

package app.ejb.login;

@Stateless
public class LoginBean {
.....
.....
UserValidation userValidation = null;
InitialContext ic = null;
try {
    ic = new InitialContext();
    if (flag == 1)
        userValidation = (UserValidation) 
            ic.lookup("java:comp/env/app/ejb/login/DBUserValidationImpl");
    else 
        userValidation = (UserValidation) 
            ic.lookup("java:comp/env/app/ejb/login/LDAPUserValidationImpl");
    }
    catch (NamingException e) {
            System.out.println("Error in InitialContext: " + e.getMessage());

This code prints:

Error in InitialContext: env/app/ejb/login/DBUserValidationImpl -- service jboss.naming.context.java.comp."app-2.0"."app-ejb-2.0".LoginBean.env.app.ejb.login.DBUserValidationImpl

What is the correct JNDI to load the bean? Isn't the full package path?

I also tried with java:module/app/ejb/login/DBUserValidationImpl but got the same error.

This worked:

java:module/DBUserValidationImpl