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401-frameworks-quarkus-core

Use when building or reviewing core Quarkus applications with CDI beans and scopes, SmallRye Config and profiles, lifecycle, interceptors and events, virtual threads, and test-friendly design. This should trigger for requests such as Review Java code for Quarkus application structure and CDI; Apply best practices for Quarkus configuration and beans; Improve CDI interceptors, events, or programmatic injection in Quarkus; Add virtual-thread configuration or tune CDI lifecycle. Part of cursor-rules-java project

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Files included (2)

  • SKILL.md3.4 KB
  • source.json1.1 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

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<T> 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.

Constraints

Before applying any Quarkus changes, ensure the project compiles. If compilation fails, stop immediately. After applying improvements, run full verification.

  • MANDATORY: Run ./mvnw compile or mvn compile before applying any change
  • PREREQUISITE: Project must compile successfully before applying Quarkus core improvements
  • SAFETY: If compilation fails, stop immediately — compilation failure is a blocking condition
  • BLOCKING CONDITION: Compilation errors must be resolved by the user before proceeding
  • VERIFY: Run ./mvnw clean verify or mvn clean verify after applying improvements
  • BEFORE APPLYING: Read the reference for detailed rules, good/bad patterns, and constraints

When to use this skill

  • Review Java code for Quarkus application structure and CDI
  • Apply best practices for Quarkus configuration and beans
  • Improve CDI interceptors, events, or programmatic injection in Quarkus
  • Add virtual-thread configuration or tune CDI lifecycle

Workflow

  1. Read reference and assess project context

Read references/401-frameworks-quarkus-core.md and inspect the current project setup before proposing changes.

  1. Gather scope and decide target improvements

Identify requested outcomes, constraints, and the minimum safe set of changes to apply.

  1. Apply framework-aligned changes

Implement or refactor configuration/code following the reference patterns and project conventions.

  1. Run verification and report results

Execute appropriate build/tests and summarize what changed, what was verified, and any follow-up actions.

Reference

For detailed guidance, examples, and constraints, see references/401-frameworks-quarkus-core.md.

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