bonjour,
je suis en train de développer l'interface d'authentification de ma application et le controle des champs du formulaire n'est éffectuer que ci les champs sont vides càd que la vérification de l'existance de l'utilisateur dans la base de données n'a pas eu lieu si les champs sont remplies. Je ne sais pas la cause d'un tel probléme. merci de m'aider s'il vous plait.
ceci le code que j'ai saisi.



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import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.PreparedStatement;
import javax.swing.JOptionPane;
 
/**
 *
 * @author nabil.khedhri.stg
 */
public class login extends javax.swing.JFrame {
 
     public Connection con;
    public ResultSet Rs;
  public PreparedStatement ps;
 
    /**
     * Creates new form login
     */
    public login() {
        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() {
 
        jPanel1 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        txtuser = new javax.swing.JTextField();
        txtpass = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
        jPanel1.setLayout(null);
 
        jLabel1.setText("username");
        jPanel1.add(jLabel1);
        jLabel1.setBounds(20, 60, 60, 14);
 
        jLabel2.setText("password ");
        jPanel1.add(jLabel2);
        jLabel2.setBounds(20, 100, 60, 14);
 
        txtuser.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                txtuserActionPerformed(evt);
            }
        });
        jPanel1.add(txtuser);
        txtuser.setBounds(100, 60, 170, 20);
        jPanel1.add(txtpass);
        txtpass.setBounds(100, 100, 160, 20);
 
        jButton1.setText("jButton1");
        jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton1MouseClicked(evt);
            }
        });
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });
        jPanel1.add(jButton1);
        jButton1.setBounds(110, 230, 73, 23);
 
        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>                        
 
    private void txtuserActionPerformed(java.awt.event.ActionEvent evt) {                                        
        // TODO add your handling code here:
    }                                       
 
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
 
 
 
    }                                        
 
    private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {                                      
        // TODO add your handling code here:
        String Sql =  "Select * from personne where username "
                +txtuser.getText()+"and password"+txtpass.getText()+"";
        try 
     { 
 
        ps = con.prepareStatement(Sql);
        ps.setString(1,txtuser.getText());
        ps.setString(1,txtpass.getText());
        Rs = ps.executeQuery(Sql); 
        if (Rs.next())
        {
            JOptionPane.showMessageDialog(null,"Welcome" +txtuser.getText());
            ApplicationTest s = new ApplicationTest  ();
            s.setVisible(true);
        }
        else
        {
            JOptionPane.showMessageDialog(null,"Invalid username or password");
 
        }
     }
     catch (Exception e) {
           JOptionPane.showMessageDialog(null,"Empty fields");
 
 
     }  
 
 
    }                                     
 
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* 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(login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(login.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
 
        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new login().setVisible(true);
            }
        });
    }
 
    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JTextField txtpass;
    private javax.swing.JTextField txtuser;
    // End of variables declaration                   
}