Java Idioms and Patterns

What problem does it solve?

This Skill reduces the risk of non-idiomatic, brittle, or unsafe Java code by guiding you toward modern Java patterns, consistent error handling, and maintainable architecture.

Core Features & Use Cases

• Modern Java (17+ LTS) guidance: use records, sealed types, pattern-matching switch, text blocks, and virtual threads appropriately for clean, expressive code.
• Robust error handling: model domain errors with exception hierarchies, avoid broad catches, and design predictable failure modes.
• Clean interfaces and DI: prefer constructor injection, program to interfaces, and avoid field injection to keep services testable and decoupled.
• Quality gates and testing: recommend JUnit 5 + AssertJ, parameterized tests, Mockito, and TestContainers to validate behavior with real dependencies.

Quick Start

Use the Java Idioms and Patterns skill to rewrite a feature’s Java code so it uses modern language features (17+), applies consistent error handling, and follows idiomatic naming, DI, and testing practices.