codice:
if(bottone.getName().equals("Modificatori")){
          File modificatori= new File("/gui/images/Modificatori.pdf"); 
                       try { 
                            java.awt.Desktop.getDesktop().open(modificatori);
          } 
          catch (IOException e1) {
                     // TODO Auto-generated catch block 
                     e1.printStackTrace(); 
          }
          dispose(); 
}
E mi restituisce questo errore..

codice:
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: The file: \gui\images\Modificatori.pdf doesn't exist. 
at java.awt.Desktop.checkFileValidation(Unknown Source) 
at java.awt.Desktop.open(Unknown Source)

........
Grazie in anticipo!!!