This function is called from the EmpireStrutsDispatcher when a request ends
if an action was accociated with the request and the action implements the Disposible interface
then the exit code returned by Disposible.dispose() is passed with the exitCode parameter
You might use the exitCode e.g. to commit or rollback a transaction on the JDBC-Connection
This exit-code might be used to indicate a successful action from the dispose method
The code will be forwarded to the WebRequest's exit method (see WebRequest.exit())