Mapping héritage vers DB

Bonjour,

Un nullpointer exception est jeté lors de l'éxécusion. pq :mur:

Merci

Application

Code:

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package Launcher;
 
import javax.persistence.EntityManager;
 
import javax.persistence.PersistenceContext;
 
import com.sun.xml.internal.ws.developer.Stateful;
 
import model.Employee;
 
public class Application {
 
	/**
         * @param args
         */
 
	@PersistenceContext(unitName="magasin")
	public static void main(String[] args) {
 
		OrgStructure b = new OrgStructure();
 
		System.out.println(b.findEmployee(1));
	}
 
 
 
	public void make(){
 
	}
 
}
 
@Stateful
class OrgStructure{
	private static final String ORG_QUERY =	"SELECT idEmployee FROM employee " +
											"WHERE idEmployee = ?";
 
	@PersistenceContext(unitName="magasin")
	EntityManager em;
 
	private Employee c = null;
 
	public Employee findEmployee(int id){
		c = (Employee) em.createNativeQuery(ORG_QUERY, model.Employee.class)
		.setParameter(1, id).getSingleResult();
 
		System.out.println(c.getNom());
 
		return c;
	}
}

classe Employee

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package model;
 
import java.io.Serializable;
import java.lang.String;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Transient;
 
/**
 * Entity implementation class for Entity: Employee
 * 
 */
 @Entity
public class Employee implements Serializable {
	private static final long serialVersionUID = 1L;
 
	@Id
	private java.lang.Integer idEmployee;
 
	private String Nom;
	@Transient
	private String Matricule;
 
	public Employee() {
		super();
	}
 
	public java.lang.Integer getIdEmployee() {
		return idEmployee;
	}
 
	public void setIdEmployee(java.lang.Integer idEmployee) {
		this.idEmployee = idEmployee;
	}
 
	public String getNom() {
		return this.Nom;
	}
 
	public void setNom(String Nom) {
		this.Nom = Nom;
	}
 
	public String getMatricule() {
		return Matricule;
	}
 
	public void setMatricule(String matricule) {
		Matricule = matricule;
	}
 
	public String toString(){
		StringBuilder v = new StringBuilder();
		v.append("Numéro : "+this.getIdEmployee() + " Nom : " + this.getNom());
 
		return v.toString();
	}
}