java-21

What problem does it solve?

This Skill provides modern Java 21 patterns and runtime practices to help engineers write safer, more maintainable code using records, sealed types, and virtual threads.

Core Features & Use Cases

• Modern language features: leverage records for immutable data and sealed types for closed hierarchies.
• Performance-conscious concurrency: apply virtual threads to scale blocking I/O.
• Patterns and guidance: guidance on pattern matching and best practices for Java 21 codebases.
• Use Case: when designing domain models or APIs that require strong immutability and clean architecture.

Quick Start

Use this skill to scaffold a small Java 21 module featuring a record-based DTO, a sealed hierarchy, and a virtual-thread I/O example.