@Override
    public <T> ConfigBuilder withConverter(Class<T> type, int priority, Converter<T> converter) {
        synchronized (this) {
            UserConverter<?> userConverter = UserConverter.newInstance(type, priority, converter);
            addUserConverter(userConverter);
        }
        return this;
    }
@ Override public < T > ConfigBuilder withConverter ( Class < T > type , int priority , Converter < T > converter ) { synchronized ( this ) { UserConverter < ? > userConverter = UserConverter . newInstance ( type , priority , converter ) ; addUserConverter ( userConverter ) ; } return this ; }
new api method for 1.2