title: List items = new ArrayList() : it does not work
body: <p>Is all in the title,
  I do not understand the problem this time is a bit different, I used the same Object(List) for two different programs and it does not work in the second time, see :</p>
  
  <pre><code>private void jMenuItem23ActionPerformed(java.awt.event.ActionEvent evt) {                                            
  init_creer_client();
  List  items  = new ArrayList();
  items.add("mawren");
  items.add("blabla");
  items.add("Bonjour");
  
  CL.show(cartes,"creer_client");       
  }   
  </code></pre>
  
  <p>screenshot about the error :
  <img src="https://i.stack.imgur.com/Dawol.png" alt="enter image description here"></p>
  
  <p>by cons here its work smoothly :</p>
  
  <pre><code> import java.awt.Dimension;
   import java.awt.HeadlessException;
   import java.util.ArrayList;
   import java.util.List;
   import javax.swing.JFrame;
   import javax.swing.JPanel;
   import javax.swing.JTextField;
   import org.jdesktop.swingx.autocomplete.AutoCompleteDecorator;
  
   public class Test_swingx extends JFrame {
  
  public Test_swingx(String title) throws HeadlessException {
  
  this.setTitle(title);
  JPanel pan=new JPanel();
  JTextField jtf=new JTextField();
  jtf.setColumns(20);
  List items  = new ArrayList();
  items.add("hello");
  items.add("marwen");
  items.add("allooo");
  AutoCompleteDecorator.decorate(jtf, items,false);
  pan.add(jtf);
  this.setContentPane(pan);
  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  this.setVisible(true);
  this.setBounds(280, 150, 500, 200);
  
  }
  
  
   public static void main(String[] args) {
  
  Test_swingx tsx=new Test_swingx("helloo swingx");
  
  }
  }
  </code></pre>
  
  <p>can anyone explain to me ?</p>