Gets an object for the given key from this resource bundle or one of its parents. This method first tries to obtain the object from this resource bundle using handleGetObject. If not successful, and the parent resource bundle is not null, it calls the parent's getObject method. If still not successful, it throws a MissingResourceException.
key - the key for the desired object
the object for the given key
NullPointerException - if key is null
MissingResourceException - if no object for the given key can be found