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Скачать или смотреть Decoding Custom Objects in Kotlin Using Jackson JsonDeserializer

  • vlogize
  • 2025-05-22
  • 0
Decoding Custom Objects in Kotlin Using Jackson JsonDeserializer
Decode custom object using Jackson JsonDeserializerkotlinjackson
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Описание к видео Decoding Custom Objects in Kotlin Using Jackson JsonDeserializer

Learn how to decode JSON objects into Kotlin classes using Jackson by understanding how to apply `JsonTypeInfo` and `JsonSubTypes`.
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This video is based on the question https://stackoverflow.com/q/67049241/ asked by the user 'Jan' ( https://stackoverflow.com/u/677987/ ) and on the answer https://stackoverflow.com/a/67049654/ provided by the user 'Jan' ( https://stackoverflow.com/u/677987/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Decode custom object using Jackson JsonDeserializer

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Decoding Custom Objects in Kotlin Using Jackson JsonDeserializer

If you're transitioning from Swift to Kotlin and diving into handling JSON, you might find yourself grappling with decoding JSON objects into various Kotlin classes based on certain fields. In this post, we'll discuss how to handle a scenario where you need to decode a JSON that can represent different shapes — either a Square or a Rectangle. We'll explore the issue and go through a step-by-step solution using Jackson's annotations.

The Problem

You have a JSON string that can represent one of two shapes, with each shape characterized by a type property. Here's the JSON structure you are dealing with:

For a Square:

[[See Video to Reveal this Text or Code Snippet]]

For a Rectangle:

[[See Video to Reveal this Text or Code Snippet]]

Your goal is to map this JSON into corresponding Kotlin classes. If the type is "Square", it should map to a Square class; if the type is "Rectangle", it should map to a Rectangle class.

Understanding Your Attempt

You initially wrote a custom JsonDeserializer in Kotlin to handle this mapping. This was your approach:

[[See Video to Reveal this Text or Code Snippet]]

While the structure was solid, your deserializer did not function as expected because the jp.readValueAs(Square::class.java) returned null. This suggests that there might be an issue with how the deserialization is being handled based on the type field.

The Solution

Upon reflection, it's clear that you can streamline the process by leveraging Jackson's powerful annotations: JsonTypeInfo and JsonSubTypes. These annotations allow you to specify how to determine the subtype of your sealed class without manually coding it in a deserializer.

Here’s how to properly annotate your Shape class:

Using Jackson Annotations

Update your Shape class with the following annotations:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Annotations

@ JsonTypeInfo: This annotation specifies that the type information will be included in the JSON data, using the existing type property to help identify which subclass to use for deserialization.

@ JsonSubTypes: This annotation defines a mapping between the string values of type and their corresponding classes. In this case, if type is "Square", the Square data class is used, and for "Rectangle", the Rectangle data class comes into play.

Conclusion

By applying these annotations, not only do you simplify your deserialization logic, but you also make your code cleaner and more maintainable. The provided solution allows Jackson to automatically choose the correct subclass based on the type property present in your JSON input.

This approach showcases the power and flexibility of Jackson when working with Kotlin data classes. Happy coding and welcome to the Kotlin community! If you experience any further issues, feel free to share them in the comments below.

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