Making multiple query to mysql in one java event

I'm having and error when trying to make multiple queries in one event. I have a table where I have a list of all the films with the main actor, producer, genre etc.

The actor, producers and genres are stocked as an int which in another table refers to a String. I'm therefore making multiple queries to print out all the data in a textarea.
However i keep getting the error

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
 at tp2.MainPage.jList1ValueChanged(MainPage.java:231)
 at tp2.MainPage.access$300(MainPage.java:24)
 at tp2.MainPage$4.valueChanged(MainPage.java:106)
 

I refered to all the lines mentioned, line 24 and 106 are generated by netbeans so i doubt the error comes from there. Line 231 is mentioned in the code below.

    private void jList1ValueChanged(javax.swing.event.ListSelectionEvent evt) {
     String npays = "null",titre= "null",nacteurPrincipal= "null",oscar= "null",realisateur= "null";
     try {
         String url = "jdbc:mysql://localhost/mycinema";
         Class.forName("com.mysql.jdbc.Driver");
         Connection connexion = DriverManager.getConnection(url, "root", "");
         Statement inst = connexion.createStatement();
         titre = jList1.getSelectedValue().toString(); //LINE 231
         ResultSet resultat = inst.executeQuery("SELECT * FROM film WHERE titre = '" + titre + "'");
         while (resultat.next()) {
             npays = resultat.getString("npays");
             realisateur = resultat.getString("realisateur");
             nacteurPrincipal = resultat.getString("nacteurPrincipal");
             oscar = resultat.getString("oscar");
         }
         resultat = inst.executeQuery("SELECT * FROM pays WHERE npays =" + npays);
         while (resultat.next()) {
             npays = resultat.getString("nom");
         }
 
         resultat = inst.executeQuery("SELECT * FROM acteur WHERE nacteur =" + nacteurPrincipal);
         while (resultat.next()) {
             nacteurPrincipal = resultat.getString("prenom") + resultat.getString("nom");
         }
 
         jTextArea3.setText(titre + " : un film par " + realisateur + "\n" + npays);
     } catch (ClassNotFoundException ex) {
         Logger.getLogger(MainPage.class.getName()).log(Level.SEVERE, null, ex);
     } catch (SQLException ex) {
         Logger.getLogger(MainPage.class.getName()).log(Level.SEVERE, null, ex);
     }
 }
 

If somebody can spot my error pleas point in out thankyou :)

P.S the variables are in french. srry for that :/

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