Duplication des labels checkboxlist et optgroup

Hi everybody,

I continue my learning Struts 2 with some small concerns.

In one of my JSP I have the following code:

This code is within a form that's pointes in follow action:

package exemple05;
 
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 
import com.opensymphony.xwork2.ActionSupport;
 
 
@SuppressWarnings("serial")
public class Client extends ActionSupport {
 
    private String identifiant;
    private String motdepasse;
    private int profession;
    private int[] repas;
    private List<Profession> listeProfessions=new ArrayList<Profession>();
    private List<Repas> listeRepas=new ArrayList<Repas>();
    private Map<Integer,String> niveauProfession=new HashMap<Integer,String>();
 
 
	public Client()
    {
 
    }
 
    //retourne les options qui pré-coché
	public int [] getDefaultRepas(){
		//listKey="id" c'est la valeur de l'id, voir comment est-ce que un Repas est instencié
		System.out.println("Dans la méthode getDefaultRepas");
		return new int [] {1, 2}; // De cette façon ci les deux options son coché par défaut
	}
 
	// retourner une liste de professions
    public List<Profession> getListeProfessions() {
		listeProfessions.add(new Profession(1, "Informaticien"));
		listeProfessions.add(new Profession(2, "Formateur"));
		listeProfessions.add(new Profession(3, "SGBDM"));
		listeProfessions.add(new Profession(4, "Responsable reseau"));
		return listeProfessions;
	}
 
 // getter et setter
    public Map<Integer, String> getNiveauProfession() {
    niveauProfession.put(1, "BAC");
    niveauProfession.put(2, "BAC1");
    niveauProfession.put(3, "BAC2");
    return niveauProfession;
    }
 
 
	public void setListeProfessions(List<Profession> listeProfessions) {
		this.listeProfessions = listeProfessions;
	}
 
	public int getProfession() {
		return profession;
	}
 
	public void setProfession(int profession) {
		this.profession = profession;
	}
 
	public List<Repas> getListeRepas() {
		listeRepas.add(new Repas(1, "Repas du midi"));
		listeRepas.add(new Repas(2, "Repas du soir"));
		return listeRepas;
	}
 
	public void setListeRepas(List<Repas> listeRepas) {
		this.listeRepas = listeRepas;
	}
 
	public int[] getRepas() {
		return repas;
	}
 
	public void setRepas(int repas[]) {
		this.repas = repas;
	}
 
	public String getIdentifiant() {
		return identifiant;
	}
 
	public void setIdentifiant(String identifiant) {
		this.identifiant = identifiant;
	}
 
	public String getMotdepasse() {
		return motdepasse;
	}
 
	public void setMotdepasse(String motdepasse) {
		this.motdepasse = motdepasse;
	}
 
 
	public String execute() {
		System.out.println("Dans la méthode execute");
		return SUCCESS;
	}
 
	// ajouter les informations du client dans la session
	public String ajouter()
	{	
		// vérifier les saisies, en cas d'erreur retourner sur la page de saisie
		if(this.identifiant.equals("") || this.motdepasse.equals(""))
		{
			return "input";
		}
		// pas d'erreur
		else
		{
			return "afficher";
		}
	}
 
 
}
 
 
// Classe de gestion des professions
class Profession 
{
    private int idProfession;
    private String nom;
    public Profession(int idProfession, String nom) 
    {
        this.idProfession=idProfession;
        this.nom=nom;
    }
 
	public int getIdProfession() {
		return idProfession;
	}
 
	public void setIdProfession(int idProfession) {
		this.idProfession=idProfession;
	}
 
	public String getNom() {
		return nom;
	}
	public void setNom(String nom) {
		this.nom=nom;
	}
 
}
 
 
//Classe de gestion des repas
class Repas 
{
    private int id;
    private String nom;
    public Repas(int id, String nom) 
    {
        this.id=id;
        this.nom=nom;
    }
 
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getNom() {
		return nom;
	}
	public void setNom(String nom) {
		this.nom = nom;
	}
 
 
}

As you may notice in the JSP, I use the same list twice listeRepas, once in:

and another time :

If I delete the tag <s

ptgroup/> the CheckBoxList tag is well generated, while if both are present I get a duplicate labels as seen in the picture attached.

I use twice the same list, is this a problem?

Thank you in advance.

Look real close at this code. Ask yourself what happens if you invoke this method more than once:

Thanks a lot, another time I will see my code with more atention and I will put more logs.