Define CDI and Quarkus development standards for CUI projects.
npx skills add https://github.com/cuioss/cui-llm-rules --skill cui-java-cdi
Please help me install this Agent Skill. Skill: cui-java-cdi Source: https://github.com/cuioss/cui-llm-rules/tree/main/claude/marketplace/skills/cui-java-cdi Command: npx skills add https://github.com/cuioss/cui-llm-rules --skill cui-java-cdi
Developing Java applications with CDI (Contexts and Dependency Injection) and Quarkus can be complex, especially when aiming for native compilation, secure containerization, and robust testing. This Skill provides a comprehensive set of standards to ensure consistent, high-quality, and performant Java development, automating best practices and reducing common pitfalls.
@RegisterForReflection and deployment processors to achieve efficient native images.finalHigh-intent search queries and answers about installing and using this skill.
Dependency injection in CDI uses constructor injection with `@Inject` annotations on bean classes. Define beans with appropriate scopes (`@ApplicationScoped` for stateless services), make injected fields `final`, use qualifiers to disambiguate multiple implementations, and leverage `Instance<T>` for optional dependencies. Quarkus optimizes CDI at build time for fast startup and efficient native images.
`@ApplicationScoped` creates singletons for stateless services, `@RequestScoped` isolates per-request state, `@SessionScoped` persists user sessions, and `@Dependent` creates new instances per injection point. Use `@ApplicationScoped` by default for microservices; avoid `@Singleton` unless you need eager initialization. Proper scoping ensures thread safety and resource efficiency in Quarkus applications.
Build secure Quarkus Docker images using minimal base images (UBI or distroless), multi-stage builds to reduce size, run containers as non-root users, configure health checks, set resource limits, and scan for vulnerabilities. Quarkus native images are particularly lean and start instantly, making containerization straightforward while maintaining security hardening.
Yes, Quarkus compiles Java applications to native binaries using GraalVM, eliminating the JVM startup overhead and reducing memory footprint dramatically. Use `@RegisterForReflection` annotations for classes requiring runtime reflection, configure deployment processors for native optimization, and validate reflection usage guidelines to ensure compatibility with ahead-of-time compilation.
CDI and Quarkus support both unit tests and integration tests with dependency injection. Use constructor injection in test classes, configure test containers with CDI scopes, mock producers for external dependencies, and run integration tests against the full Quarkus container. Test configurations should match production standards for security, resource limits, and health checks.
Constructor injection makes dependencies explicit, immutable, and testable without reflection or additional frameworks. Field injection hides dependencies and complicates testing; constructor injection with `final` fields prevents accidental mutation, clarifies object requirements, and integrates naturally with Quarkus's build-time optimization and native compilation.
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