Groovy

Groovy programming language tutorials, examples, and best practices.

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.” Last Updated: July 2026 | Tested on: Groovy 5.0.6, Java 17 | Difficulty: Advanced | Reading Time: 18 minutes Groovy ships with a rich set of built-in annotations – @Immutable, @ToString, @Builder, and dozens ... Read More

Groovy Property Files – Read, Write, and Manage Config with 10 Tested Examples

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Working with Groovy property files is simple. See 10 tested examples to read, write, merge properties, use defaults, and convert between formats on Groovy 5.0.6. “Configuration is the soul of every application. Get it wrong and nothing works. Get it right and nobody notices.” Last Updated: July 2026 | Tested on: Groovy 5.0.6, Java 17+ | Difficulty: Beginner to Intermediate | Reading Time: 14 minutes Every application needs configuration. Database URLs, API keys, feature flags, environment-specific settings – they all ... Read More

Groovy Shell (groovysh) – Interactive REPL with 10 Tested Examples

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The Groovy Shell (groovysh) REPL is covered here with 10 tested examples. Learn commands, tab completion, multi-line input, imports, and scripting tips on Groovy 5.0.6. “The best way to learn a language is to have a conversation with it. A REPL is that conversation.” Last Updated: July 2026 | Tested on: Groovy 5.0.6, Java 17+ | Difficulty: Beginner | Reading Time: 14 minutes If you’ve installed Groovy and want a quick way to experiment with code without creating files, the ... Read More