As addition to other solutions, @JsonProperty annotation is absolutely important if you use the @JsonCreator annotation in classes which do not have a no-arg constructor. So your DataContext for "video_length_textbox" is about to itself, and also your IncrementingTextBox class does not have a community property known as ConfigurationModel Actually, properties https://propertyyamunaexpressway.blogspot.com/2025/05/shape-your-future-with-modern-elegance.html