Resolving java.io.NotSerializableException in Kotlin data class with kotlinx.serialization

Discover how to fix the `java.io.NotSerializableException` error in Kotlin for serializable data classes using kotlinx.serialization.
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This video is based on the question https://stackoverflow.com/q/75094058/ asked by the user 'Vishal Mahavar' ( https://stackoverflow.com/u/13896580/ ) and on the answer https://stackoverflow.com/a/75094577/ provided by the user 'Surajkaran Meghwanshi' ( https://stackoverflow.com/u/12748481/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving java.io.NotSerializableException in Kotlin data class with kotlinx.serialization

If you're developing an Android application using Kotlin and kotlinx.serialization, you might run into the java.io.NotSerializableException. This error can stop you in your tracks, especially when you’re trying to serialize your data classes. Let's break down the problem and the solution for this issue.

What is java.io.NotSerializableException?

java.io.NotSerializableException is thrown when an attempt is made to serialize an object that does not implement the Serializable interface. Serialization is crucial in many applications for saving object states, sending objects over a network, or storing them in files. If your class doesn’t properly implement the requirements for serialization, this exception will arise.

In this case, your BaseElement data class is marked using @ Serializable from kotlinx.serialization, which is a great start. However, you also need to implement the standard Serializable interface from Java to avoid the NotSerializableException during the serialization process using ObjectOutputStream.

The Problem: Code Overview

In your code, you attempted to serialize an object of your BaseElement class like this:

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

Here is your class definition:

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

The NotSerializableException was triggered based on the stack trace you provided. This indicates that although your class is configured for kotlinx.serialization, it does not implement the Java Serializable interface that ObjectOutputStream requires.

Solution: Implementing the Serializable Interface

To resolve this issue, you only need to add : Serializable to your class definition. Here’s how to make the necessary modification:

Updated Code for BaseElement

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

Explanation

Annotations: The @ Serializable annotation is used to indicate that this class is serializable with Kotlin's serialization library.

Extending Serializable: By adding : Serializable, you are explicitly telling Java’s serialization process that this class can also be serialized using Java’s standard serialization methods, which is requisite when using ObjectOutputStream.

Conclusion

After implementing the above changes to your BaseElement class, you should be able to serialize your data class without encountering the java.io.NotSerializableException. Serialization is a common requirement in application development, and understanding how to implement it correctly in Kotlin will enhance your ability to manage data efficiently across your applications.

Feel free to share your thoughts or ask further questions in the comments below! Happy coding!

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