Final Keyword is a Lie? Breaking Java Immutability with Reflection & Serialization (JDK 26 Warning)

Most Java developers trust final to guarantee immutability. But under the hood, that guarantee has always had cracks.

In this video, we go beyond theory and prove it with code:

* How final fields can be modified using reflection
* How serialization bypasses constructors and changes supposedly immutable objects
* A real scenario using file-based serialization and version mismatch
* Why you get ClassCastException when using a different class (v2 package)
* How to fix it using custom ObjectInputStream
* What changes with JDK 26 (JEP 500) and why the JVM now warns you

This is not just a trick—these behaviors exist in real frameworks and can impact system design, security, and debugging.

If you work with Spring Boot, microservices, or distributed systems, this is something you must understand.

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⚠️ *Disclaimer*
The content and opinions expressed on this channel are personal. Code samples shared here are for educational purposes and can be reused for learning.

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#Java #JDK26 #Reflection #Serialization #Immutability #SystemDesign #SpringBoot #BackendEngineering #JVM #Codefarm

Видео Final Keyword is a Lie? Breaking Java Immutability with Reflection & Serialization (JDK 26 Warning) канала Codefarm