Teach Java 21 records, sealed types, pattern matching, and virtual threads.
npx skills add https://github.com/fearovex/claude-config --skill java-21-fearovex
Please help me install this Agent Skill. Skill: java-21 Source: https://github.com/fearovex/claude-config/tree/main/skills/java-21 Command: npx skills add https://github.com/fearovex/claude-config --skill java-21-fearovex
Java 21 introduces powerful features that can be misapplied or underutilized. This guide explains how to adopt records, sealed types, pattern matching, and virtual threads to write clearer, safer concurrent code.
Use cases include building lightweight data transfer objects, modeling domain hierarchies, and implementing high-throughput I/O tasks with robust error handling.
Write a small Java 21 module that demonstrates records, sealed interfaces, pattern matching, and virtual threads in a concurrent example.
High-intent search queries and answers about installing and using this skill.
Virtual threads in Java 21 allow you to implement scalable I/O-bound concurrency by handling high-throughput tasks with robust error handling. This guide provides concrete examples demonstrating virtual-thread-based concurrency for typical application scenarios.
The best way to model closed domain hierarchies is using sealed interfaces and classes alongside pattern matching. This approach enforces closed hierarchies with exhaustive switches, ensuring concise and safe control flow.
You create immutable value objects using records in Java 21 by leveraging compact constructors and built-in validation hooks. This allows you to build lightweight data transfer objects with safer, more expressive code.
Yes, you need a Java 21+ toolchain to use sealed types, records, and virtual threads. This environment is required to access the pattern matching enhancements and concurrency features demonstrated in the guide.
You should use sealed interfaces instead of standard classes to guarantee exhaustiveness in your pattern matching switches. This prevents unhandled cases during domain hierarchy modeling, making your control flow safer.
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