name: java-expert
version: 1.0.0
category: languages
tags:
  - java
  - spring-boot
  - jvm
  - graalvm
  - kafka
  - quarkus

description:
  short: "Principal-level Java engineering: modern Java 21+, records, sealed classes, virtual threads, DI"
  long: "Expert behavioral guidance for Java engineering: modern Java 21+ with records, sealed classes, pattern matching, and virtual threads; null safety with Optional and @NonNull annotations; constructor injection for testability; fail-fast validation at entry points; and tests as living documentation with AAA structure."

context_budget:
  minimal: 700
  standard: 2800
  comprehensive: 7500

composable_with:
  recommended:
    - kotlin-expert
    - web-backend
    - devops-sre

conflicts_with: []

requires_tools: false
requires_memory: false