* @return Instance of custom implementation if one was given; otherwise instance of default type
     */
    @SuppressWarnings("unchecked")
    private static <T> T newImplementation(final XmlPullParser parser, final Class<T> defaultClazz) {
        return (T) newImplementation(loadImplementation(parseImplementation(parser), defaultClazz));
    }

    /**

            String goalPrefix, String goal, String existingImplementation, String newImplementation) {
        super("Goal: " + goal + " already exists in the plugin descriptor for prefix: " + goalPrefix
                + System.lineSeparator() + "Existing implementation is: " + existingImplementation
                + System.lineSeparator() + "Conflicting implementation is: " + newImplementation);
    }