As addition to other answers, @JsonProperty annotation is admittedly significant if you use the @JsonCreator annotation in lessons which do not need a no-arg constructor. So your DataContext for "video_length_textbox" is about to by itself, plus your IncrementingTextBox course does not have a public property identified as ConfigurationModel Examples are https://aipljoydistrict.travel.blog/2025/07/10/jms-floors-manesar-nature-inspired-low-rise-homes-in-gurgaon/