Hello, please I need your help

I'm working in my jboss entreprise project with JPA EJB and Jboss AS 7.0.2 as my server runtime.

Well I'm new in rest and I don't know how I can do the thing with JPA, this is my the entity that I want lunch a list of  as ressource:

package model;

import java.io.Serializable;
import javax.persistence.*;

import java.util.List;


/**
 * The persistent class for the agence database table.
 * 
 */
@Entity
public class Agence implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private int id;

    @Lob
    private String adresse;

    @Lob
    private String agence;

    @Lob
    private String fax;

    @Lob
    private String tel;

    private String ville;

    //bi-directional many-to-one association to Banque
    @ManyToOne
    @JoinColumn(name="idbanque")
    private Banque banque;

    //bi-directional many-to-one association to Salarie
    @OneToMany(mappedBy="agence")
    private List<Salarie> salaries;

    //bi-directional many-to-one association to Societe
    @OneToMany(mappedBy="agence")
    private List<Societe> societes;

    public Agence() {
    }

    public int getId() {
        return this.id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getAdresse() {
        return this.adresse;
    }

    public void setAdresse(String adresse) {
        this.adresse = adresse;
    }

    public String getAgence() {
        return this.agence;
    }

    public void setAgence(String agence) {
        this.agence = agence;
    }

    public String getFax() {
        return this.fax;
    }

    public void setFax(String fax) {
        this.fax = fax;
    }

    public String getTel() {
        return this.tel;
    }

    public void setTel(String tel) {
        this.tel = tel;
    }

    public String getVille() {
        return this.ville;
    }

    public void setVille(String ville) {
        this.ville = ville;
    }

    public Banque getBanque() {
        return this.banque;
    }

    public void setBanque(Banque banque) {
        this.banque = banque;
    }

    public List<Salarie> getSalaries() {
        return this.salaries;
    }

    public void setSalaries(List<Salarie> salaries) {
        this.salaries = salaries;
    }

    public List<Societe> getSocietes() {
        return this.societes;
    }

    public void setSocietes(List<Societe> societes) {
        this.societes = societes;
    }

}

and this is the ejb mb

package ejb;

import java.util.ArrayList;

import javax.ejb.LocalBean;
import javax.ejb.Stateful;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;

import model.Agence;

/**
 * Session Bean implementation class ejbParameters
 */
@Stateful
@LocalBean
public class ejbParameters implements ejbParametersRemote {
    @PersistenceContext(type = PersistenceContextType.EXTENDED)
      EntityManager em;
    /**
     * Default constructor. 
     */
    public ejbParameters() {
    }
    @Override
    public ArrayList<Agence> allAgences() {
        ArrayList<Agence> societes = new ArrayList<Agence>();
        societes.addAll(em.createQuery("select a from Agence a").getResultList());
        return societes;
    }
    @Override
    public void addAgnece(Agence a) {
        // TODO Auto-generated method stub
        
    }
    
    

}

and this is the SW:

package ejbrest;

import java.util.ArrayList;

import javax.ejb.EJB;
import javax.ejb.LocalBean;
import javax.ejb.Stateless;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;


import model.Agence;

import ejb.ejbParametersRemote;

@Path("/ressources")
@Stateless
@LocalBean
public class ServicesWS {

    @EJB
    ejbParametersRemote ejb;

   
    @GET
    @Path("/agences")
    @Produces("application/json")
    public ArrayList<Agence> getCustomer() {
        return ejb.allAgences();
    }

  
    
    
}

when I access to the URL localhost:8080/myproject/ressources/agences as a result I get :

[{"adresse":"Cartier Hassan II, Agadir","salaries":[],"tel":"05...........","ville":"Agadir","fax":null,"agence":"Agence Kettani","banque":{"nom":"Banque Populaire","agences":[{"adresse":"Cartier Hassan II, Agadir","salaries":[],"tel":"05...........","ville":"Agadir","fax":null,"agence":"Agence Kettani","banque":{"nom":"Banque Populaire","ag

I have only one row in my table Agence, and it have a "many to one" relation with the table Banque and it looks like that the resteasy publichess an infinite cycle of jsons one row inside wich there is a banque wich has a number of agences(one to many) and etc.......

I forgot to mention that it's only after changing the annotation @Stateless to @Statefull of the ejb that the error bellow  goes:

LazyInitializationException: failed to lazily initialize a collection of role...................

and also I tried to add the annotation @XMLRoot ... but nothing changed

I appreciate your help

Cordialy....