Problema com busca

private JTextField keyWordText = new JTextField(); 
private JButton keyWordButton = new JButton(); 
private JLabel searchingLabel = new JLabel(); 

keyWordButton.addActionListener(new ActionListener() {
     public void actionPerformed(ActionEvent e) {                                   
         
          final SwingWorker worker = new SwingWorker() {

              public Object construct() {
         
                  // pega do Bundle a string referente a "searching" ("Procurando")    
                  searchingLabel.setText( messages.getString("searching") + "...");
                  return null;
              }         
 
 	  
              public void finished() {
                  // executa busca no webservice	
	          // demora uns 4segundos
                  newSearch();         
 
          	  // seta o text para "";
                  searchingLabel.setText("");
              }
          };
          worker.start();

     }
 }