Individual skill
java-modern
Java 21+ features for Spring Boot - records, sealed classes, pattern matching, virtual threads, text blocks. Use when user asks about modern Java, Java 21 features, or when modernizing existing code.
skills/java-modern/SKILL.md
Source commit 8d0eeefe2cd52876bb750fc7677bbe45ae5c026c
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- Last checked
- Nov 9, 2026
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- Nov 7, 2026
- License
- Apache-2.0
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# Java Modern Skill
Java 21+ language features and how to use them in Spring Boot applications.
## When to Use
- Building new Spring Boot 4.x applications (default to modern features)
- Modernizing/refactoring existing Java code
- User asks about records, sealed classes, pattern matching, virtual threads
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## Records (Java 16+)
### DTOs