
For the Java-based client application you only need the IDL representation of the Notificator callback object. Based on the IDL, you will generate the necessary classes that facilitate communication between the UtilCallback bean and the callback object's implementation on the client side.
To generate the IDL file, use the command-line rmic tool that is distributed with your JDK installation.
If you are not confident about using the rmic command syntax, execute rmic -h to read the help provided with the command.
After you execute the command as described above, you must have the Notificator.idl file generated in the output directory that you have specified.