Quarkus Core Guidelines

Apply Quarkus core guidelines for CDI beans, configuration, profiles, and lifecycle.

What is covered in this Skill?

• @QuarkusMain and application entry (when custom main is needed)
• CDI scopes: @ApplicationScoped, @Singleton, @Dependent; bean disambiguation (@Default, @Alternative, @Named)
• Constructor injection with @Inject
• CDI interceptors (@Interceptor, @InterceptorBinding) for cross-cutting concerns
• CDI events: @Observes StartupEvent / ShutdownEvent, @ObservesAsync for async dispatch
• Programmatic injection with Instance for dynamic bean selection
• @ConfigMapping and structured configuration with Bean Validation (@Valid)
• Profile-specific properties (%dev, %test, %prod) and @IfBuildProfile
• Startup and shutdown observers (@Startup, @PreDestroy)
• Virtual threads with @RunOnVirtualThread (Java 21+)
• Native-image safety: @RegisterForReflection, @DisabledOnNativeImage

Scope: Apply recommendations based on the reference rules and good/bad code examples.