help with bean validation error in JPA when trying to persist an Entity

[caleb momanyi]

i get this error when trying to Persist a customer Entity in my web application using netbeans with the default glassfish server persistence provider eclipselink(JPA2.0)

error is

SEVERE: javax.validation.ConstraintViolationException: Bean Validation constraint(s) violated while executing Automatic Bean Validation on callback event:'prePersist'. Please refer to embedded ConstraintViolations for details.

the table that i want to write to has the following colums
id ==> primarykey auto increment not null int
name == varchar(45) not null
phone ==> varchar(19)
nationalIdNo ==>varchar(19)
balance ==> bigdecimal(6,2) not null default(0.00)

in my addNewCustomer i only need to set name, phone and nationalIdNo only

this is my code

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package session;

import cart.Cart;
import entity.Customer;
import javax.ejb.Stateless;
import javax.ejb.LocalBean;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

/**
 *
 * @author qualebs
 */
@Stateless
@LocalBean
public class BetManager {
    @PersistenceContext(unitName="qualebsPU")
            private EntityManager em;
    
    public void myCustomer(String name, String natId, String phone, String password, Cart cart) {
        
        Customer customer = addCustomer(name,natId,phone,password);
    }

    private Customer addCustomer(String name, String natId, String phone, String password) {
        Customer customer = new Customer();
      
        customer.setName(name);
        customer.setNationalId(natId);
        customer.setPhone(phone);
        customer.setPassword(password);     
        em.persist(customer);
       
        return customer;
    }
}

why am i getting this error?
and how do you do a bean validation?

[ntumba lobo]

My guess would be that you have validation rules emdedded in your Customer class and the validation fails before persisting.
But it is hard to say without seeing the Customer

[caleb momanyi]

I removed all validation annotations beggining with @NOTNULL and it worked.