DefaultListModel model =new DefaultListModel();
 Vector dataLIST2= new Vector();
 ArrayList IDEXLIST2=new ArrayList();
 ArrayList qteL2=new ArrayList();
 ArrayList ValideL2=new ArrayList();
 JList jList2 = new JList();
   Try{               model.clear();           jList2.removeAll();             dataLIST2.clear();             IDEXLIST2.clear();             qteL2.clear();             ValideL2.clear();                        connec = getConnec();         Statement reqlist = connec.createStatement();         ResultSet Resultlis = reqlist.executeQuery("SELECT a.id,a.produit,a.valide,b.qte FROM stock.items a LEFT JOIN quantite_cat b ON a.id=id_prod and b.cat='A'");                        while(Resultlis.next()){                  dataLIST2.add(Resultlis.getString("produit"));           IDEXLIST2.add(Resultlis.getString("id"));           qteL2.add(Resultlis.getInt("qte"));             ValideL2.add(Resultlis.getString("valide"));             }            model.addElement(dataLIST2);           jList2.setModel(model);                  Resultlis.close();         }catch(Throwable exception){           System.out.println(exception) ;         }