Why is the valueChanged method of my listSelectionListener not firing when an item is selected in my JBList?

public class MainPanel extends JPanel {

 private PathTextField pathTextField = new PathTextField(20, this);
 private JBList fileList = new JBList(new DefaultListModel());
 private Project project;

 public MainPanel(Project project) {
   super();

   this.project = project;

   Set<KeyStroke> forwardKeys = new HashSet<KeyStroke>(1);
   forwardKeys.add(KeyStroke.getKeyStroke(
   KeyEvent.VK_TAB, InputEvent.CTRL_MASK));
   Set<KeyStroke> backwardKeys = new HashSet<KeyStroke>(1);
   backwardKeys.add(KeyStroke.getKeyStroke(KeyEvent.VK_SHIFT, InputEvent.CTRL_MASK));
   setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, forwardKeys);
   setFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, backwardKeys);
 
   fileList.addListSelectionListener(new ListSelectionListener() {
 
     @Override
     public void valueChanged(ListSelectionEvent e) {
       System.out.println("Value changed");
       String selectedFile = fileList.getSelectedValue().toString();
       System.out.println("Selected file " + selectedFile);
       VirtualFile destination = LocalFileSystem.getInstance().findFileByPath(pathTextField.getText()
         + selectedFile);
       if(destination.isDirectory()) {
         pathTextField.setText(destination.getPath());
       }
       else {
         OpenFileDescriptor ofd = new OpenFileDescriptor(project, destination);
         ofd.navigate(false);
       }
    }
  });
  
   this.setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
   this.setPreferredSize(new Dimension(500,500));
   this.add(pathTextField);
   this.add(fileList);
 }
 

}




The problem is pretty simple: the valueChanged method never happens when I click on an item in the list.

Here is the whole project: https://github.com/adammfrank/find-file