annotations

Using annotations and AST transforms in Groovy classes.

Groovy Custom Annotations – Create Your Own with 10 Tested Examples

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Groovy custom annotations are versatile. See 10 tested examples covering annotation declaration, retention policies, AST transformations, and runtime processing. “Annotations are metadata that give your code a voice – they tell the compiler, the runtime, and other developers what your intentions are without cluttering your logic.” Joshua Bloch, Effective Java Last Updated: March 2026 | Tested on: Groovy 4.x / 5.x, Java 11+ | Difficulty: Advanced | Reading Time: 18 minutes Groovy ships with a rich set of built-in annotations ... Read More

Groovy AST Transformations – Compile-Time Code Generation with 10+ Examples

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Groovy AST transformations for compile-time code generation. 10+ examples covering @ToString, @EqualsAndHashCode, @Canonical, @Delegate, and custom ASTs. “The best code is code you never write. AST transformations generate boilerplate at compile time so you can focus on what matters.” Groovy Metaprogramming Philosophy Last Updated: March 2026 | Tested on: Groovy 5.x, Java 17+ | Difficulty: Intermediate to Advanced | Reading Time: 20 minutes Every developer knows the pain of writing toString(), equals(), hashCode(), constructors, and getters/setters for every class. It’s ... Read More