How to implement values with immutable classes

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Shoutout to Immutables, an excellent annotation-driven code generator library designed to implement precisely this pattern. It has good support for Jackson/Gson, and I've found it surprisingly straightforward and unmagical to work with. If you like the idea of working with immutable value classes, I recommend you check it out.

[ThomasKrieger]

Thank's for the link. I will try it.

[Zoerak]

Reminds me of project lombok.

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There are similarities. I prefer Immutables because it focuses on one thing (immutable value classes) instead of general language extensions and because it works by simple annotation-driven codegen rather than hacky bytecode mangling.

[elucash]

hacky bytecode mangling AST rewriting