Erro Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

galera, ta dando esse erro ai que postei no topico, mais nao sei onde… podem me ajudar?

/**
*

@author SuporteMdw
*/
public class cadastro extends javax.swing.JFrame {

/**

Creates new form cadastro
*/
Connection conecta;
PreparedStatement pst;
ResultSet rs;

String url = “jdbc:mysql://localhost/Cad_cliente”;

String driver = “com.mysql.jdbc.Driver”;

String user = “root”;

String pass = “”;

public void abreconexao()

{

try{

Class.forName(driver);

conecta = (com.mysql.jdbc.Connection) DriverManager.getConnection(url, user, pass);
 
 pst = (PreparedStatement) conecta.createStatement();
          System.out.println("conectado!");    
 } catch (ClassNotFoundException | SQLException erro){
     System.out.println("Não conectado!");    
 }

}

public cadastro() throws ClassNotFoundException {
initComponents();

public void cadastraUsuario (){
//String sql = “insert into usuario (nome,senha) values (?, ?)”;

try {

------------------------------------------ ele da um erro aqui nessa linha de baixo —

PreparedStatement stmt = conecta.prepareStatement(“insert into usuario (nome,senha) values (?,?)”);

//pst = conecta.prepareStatement(stmt);

pst.setString(1,txt_nome.getText());

pst.setString(2,txt_senha.getText());

pst.execute();

pst.close();

System.out.println(“Gravado!”);

conecta.close();

JOptionPane.showMessageDialog(null, " inserido");
        
    } catch (SQLException error) {
        JOptionPane.showMessageDialog(null, error);
    }
}

/**
 * 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() {

    jLabel1 = new javax.swing.JLabel();
    txt_nome = new javax.swing.JTextField();
    txt_senha = new javax.swing.JTextField();
    jLabel2 = new javax.swing.JLabel();
    jButton1 = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    getContentPane().setLayout(null);

    jLabel1.setText("Nome:");
    getContentPane().add(jLabel1);
    jLabel1.setBounds(20, 30, 31, 14);
    getContentPane().add(txt_nome);
    txt_nome.setBounds(70, 30, 90, 20);
    getContentPane().add(txt_senha);
    txt_senha.setBounds(70, 70, 90, 20);

    jLabel2.setText("cpf");
    getContentPane().add(jLabel2);
    jLabel2.setBounds(20, 70, 15, 14);

    jButton1.setText("jButton1");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton1ActionPerformed(evt);
        }
    });
    getContentPane().add(jButton1);
    jButton1.setBounds(50, 120, 73, 23);

    pack();
}// </editor-fold>                        

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // TODO add your handling code here:
    cadastraUsuario();
}                                        

/**
 * @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 http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    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(cadastro.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(cadastro.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(cadastro.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(cadastro.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() {
            try {
                new cadastro().setVisible(true);
            } catch (ClassNotFoundException ex) {
                Logger.getLogger(cadastro.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
    });
}

// Variables declaration - do not modify                     
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JTextField txt_nome;
private javax.swing.JTextField txt_senha;
// End of variables declaration

}

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