bonjour
j'ai créer base de données "mam.accdb"
je veut afficher les données dans un JTable de netbeans
il m'a afficher "Erreur afficher la liste de stagiaire null "
aidez moi svp !!
le code :
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package Introduction;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Date;
import javax.swing.JOptionPane;
import javax.swing.table.DefaultTableModel;
/**
 *
 * @author rayen
 */
public class FormStagiaire extends javax.swing.JFrame {
 
    /**
     * Creates new form FormStagiaire
     */
    public FormStagiaire() {
        initComponents();
    }
 
    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {
 
        buttonGroup1 = new javax.swing.ButtonGroup();
        jPanel1 = new javax.swing.JPanel();
        txtmat = new javax.swing.JTextField();
        txtnom = new javax.swing.JTextField();
        txtprenom = new javax.swing.JTextField();
        txtmoyenne = new javax.swing.JTextField();
        txtdateNaiss = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jLabel5 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        TableStg = new javax.swing.JTable();
        btnPremier = new javax.swing.JButton();
        btnPrecedent = new javax.swing.JButton();
        btnSuivant = new javax.swing.JButton();
        btnDernier = new javax.swing.JButton();
        btnAjouter = new javax.swing.JButton();
        btnModifier = new javax.swing.JButton();
        btnSupprimer = new javax.swing.JButton();
        btnAfficher = new javax.swing.JButton();
        btnRechercher = new javax.swing.JButton();
        jRadioButton1 = new javax.swing.JRadioButton();
        jRadioButton2 = new javax.swing.JRadioButton();
        txtRechercher = new javax.swing.JTextField();
        jLabel6 = new javax.swing.JLabel();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
        jPanel1.setFont(new java.awt.Font("Century Gothic", 1, 11)); // NOI18N
 
        jLabel1.setText("mat:");
 
        jLabel2.setText("nom:");
 
        jLabel3.setText("prenom:");
 
        jLabel4.setText("moyenne:");
 
        jLabel5.setText("dateNaiss:");
 
        TableStg.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null}
            },
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4"
            }
        ));
        jScrollPane1.setViewportView(TableStg);
 
        btnPremier.setText("<<");
        btnPremier.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnPremierActionPerformed(evt);
            }
        });
 
        btnPrecedent.setText("<");
 
        btnSuivant.setText(">");
 
        btnDernier.setText(">>");
 
        btnAjouter.setText("Ajouter");
 
        btnModifier.setText("Modifier");
 
        btnSupprimer.setText("Supprimer");
 
        btnAfficher.setText("Afficher");
 
        btnRechercher.setText("Rechercher");
 
        buttonGroup1.add(jRadioButton1);
        jRadioButton1.setText("mat");
 
        buttonGroup1.add(jRadioButton2);
        jRadioButton2.setText("nom");
 
        jLabel6.setText("Recherche par");
 
        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(btnAjouter, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addGap(10, 10, 10)
                        .addComponent(btnModifier, javax.swing.GroupLayout.PREFERRED_SIZE, 79, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(btnSupprimer))
                    .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(jPanel1Layout.createSequentialGroup()
                            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addComponent(jLabel4)
                                .addComponent(jLabel5)
                                .addComponent(jLabel3)
                                .addComponent(jLabel1)
                                .addComponent(jLabel2))
                            .addGap(18, 18, 18)
                            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                                    .addComponent(txtmoyenne, javax.swing.GroupLayout.DEFAULT_SIZE, 178, Short.MAX_VALUE)
                                    .addComponent(txtprenom)
                                    .addComponent(txtnom))
                                .addComponent(txtdateNaiss, javax.swing.GroupLayout.PREFERRED_SIZE, 178, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                                    .addComponent(txtmat, javax.swing.GroupLayout.PREFERRED_SIZE, 178, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addGap(1, 1, 1))))
                        .addGroup(jPanel1Layout.createSequentialGroup()
                            .addComponent(btnPremier, javax.swing.GroupLayout.PREFERRED_SIZE, 51, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGap(18, 18, 18)
                            .addComponent(btnPrecedent, javax.swing.GroupLayout.PREFERRED_SIZE, 51, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGap(18, 18, 18)
                            .addComponent(btnSuivant, javax.swing.GroupLayout.PREFERRED_SIZE, 51, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGap(18, 18, 18)
                            .addComponent(btnDernier, javax.swing.GroupLayout.PREFERRED_SIZE, 51, javax.swing.GroupLayout.PREFERRED_SIZE))))
                .addGap(30, 30, 30)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(jLabel6)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addGap(0, 0, Short.MAX_VALUE)
                                .addComponent(btnRechercher)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(btnAfficher, javax.swing.GroupLayout.PREFERRED_SIZE, 85, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addComponent(jRadioButton1)
                                    .addComponent(jRadioButton2))
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(txtRechercher, javax.swing.GroupLayout.PREFERRED_SIZE, 126, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addGap(0, 0, Short.MAX_VALUE))))
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 417, Short.MAX_VALUE))
                .addContainerGap())
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(32, 32, 32)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(txtmat, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel1))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(txtnom, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel2))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(txtprenom, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel3))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel4)
                            .addComponent(txtmoyenne, javax.swing.GroupLayout.PREFERRED_SIZE, 26, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel5)
                            .addComponent(txtdateNaiss, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 139, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(18, 18, 18)
                        .addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addGap(19, 19, 19)
                                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                                    .addComponent(btnDernier)
                                    .addComponent(btnSuivant)
                                    .addComponent(btnPrecedent)
                                    .addComponent(btnPremier)))
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(txtRechercher, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                        .addGap(18, 18, 18)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(btnSupprimer)
                            .addComponent(btnModifier)
                            .addComponent(btnAjouter)
                            .addComponent(btnRechercher)
                            .addComponent(btnAfficher)))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(7, 7, 7)
                        .addComponent(jRadioButton1)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(jRadioButton2)))
                .addContainerGap(35, Short.MAX_VALUE))
        );
 
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
 
        pack();
    }// </editor-fold>                        
// load formstagiere
     void formWindowOpened (){
    try{
 
        // connection avec Base de données tsdi
 
       Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        String url = "jdbc:odbc:Driver={Microsoft Access Driver " +
            "(*.mdb, *.accdb)};DBQ=C:\\database\\mam.accdb";
        Connection con = DriverManager.getConnection(url);
        System.out.println("Connected!");
 
 
       con.close(); 
 
    dt = new DefaultTableModel();
    dt.addColumn("mat");
    dt.addColumn("nom");
    dt.addColumn("prenom");
    dt.addColumn("moyenne");
    dt.addColumn("dateNaiss");
   TableStg.setModel(dt);
    AfficherStagiaire();
 
    }catch(ClassNotFoundException | SQLException e)
    {
        JOptionPane.showMessageDialog(null, "Erreur de connection\n"+e.getMessage());
    }
    }
    // procedure qui affiche la liste des stagiereres
    private void AfficherStagiaire(){
    try{
 
        dt.setRowCount(0);// vider la liste de stagiaires
        Rs = St.executeQuery("Select * From stg");
        while(Rs.next()){
         mat = Rs.getInt("mat");
         nom = Rs.getString("nom");
         prenom = Rs.getString("prenom");
         moyenne = Rs.getDouble("moyenne");
         dateNaiss = Rs.getDate("dateNaiss");
         Object[] stg = {mat,nom,prenom,moyenne,dateNaiss};
         dt.addRow(stg);
        }
 
 
 
 
 
 
    }catch(Exception e)
    {
        JOptionPane.showMessageDialog(null, "Erreur afficher la liste de stagiaire\n"+e.getMessage());
    }
    }
 
 
    private void btnPremierActionPerformed(java.awt.event.ActionEvent evt) {                                           
        // TODO add your handling code here:
    }                                          
 
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
 
      new FormStagiaire().formWindowOpened();
 
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see <a href="http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html" target="_blank">http://download.oracle.com/javase/tu...feel/plaf.html</a> 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(FormStagiaire.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(FormStagiaire.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(FormStagiaire.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(FormStagiaire.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
 
        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new FormStagiaire().setVisible(true);
            }
        });
    }
    private Connection cnx;
    private Statement St;
    private ResultSet Rs;
    private DefaultTableModel dt;
    private int mat;
    private String nom,prenom;
    private double moyenne;
    private Date dateNaiss;
 
 
    private int i; // indice de deplacement
 
 
    // Variables declaration - do not modify                     
    private javax.swing.JTable TableStg;
    private javax.swing.JButton btnAfficher;
    private javax.swing.JButton btnAjouter;
    private javax.swing.JButton btnDernier;
    private javax.swing.JButton btnModifier;
    private javax.swing.JButton btnPrecedent;
    private javax.swing.JButton btnPremier;
    private javax.swing.JButton btnRechercher;
    private javax.swing.JButton btnSuivant;
    private javax.swing.JButton btnSupprimer;
    private javax.swing.ButtonGroup buttonGroup1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JRadioButton jRadioButton1;
    private javax.swing.JRadioButton jRadioButton2;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextField txtRechercher;
    private javax.swing.JTextField txtdateNaiss;
    private javax.swing.JTextField txtmat;
    private javax.swing.JTextField txtmoyenne;
    private javax.swing.JTextField txtnom;
    private javax.swing.JTextField txtprenom;
    // End of variables declaration                   
}