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.
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
- Read reference and assess project context
Read references/401-frameworks-quarkus-core.md and inspect the current project setup before proposing changes.
- Gather scope and decide target improvements
Identify requested outcomes, constraints, and the minimum safe set of changes to apply.
- Apply framework-aligned changes
Implement or refactor configuration/code following the reference patterns and project conventions.
- 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.
1---2name: 401-frameworks-quarkus-core3description: 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 project4license: Apache-2.05---6# Quarkus Core Guidelines
7
8Apply Quarkus core guidelines for CDI beans, configuration, profiles, and lifecycle.
9
10**What is covered in this Skill?**
11
12- @QuarkusMain and application entry (when custom main is needed)
13- CDI scopes: @ApplicationScoped, @Singleton, @Dependent; bean disambiguation (@Default, @Alternative, @Named)
14- Constructor injection with @Inject
15- CDI interceptors (@Interceptor, @InterceptorBinding) for cross-cutting concerns
16- CDI events: @Observes StartupEvent / ShutdownEvent, @ObservesAsync for async dispatch
17- Programmatic injection with Instance<T> for dynamic bean selection
18- @ConfigMapping and structured configuration with Bean Validation (@Valid)
19- Profile-specific properties (%dev, %test, %prod) and @IfBuildProfile
20- Startup and shutdown observers (@Startup, @PreDestroy)
21- Virtual threads with @RunOnVirtualThread (Java 21+)
22- Native-image safety: @RegisterForReflection, @DisabledOnNativeImage
23
24**Scope:** Apply recommendations based on the reference rules and good/bad code examples.
25
26## Constraints
27
28Before applying any Quarkus changes, ensure the project compiles. If compilation fails, stop immediately. After applying improvements, run full verification.
29
30- **MANDATORY**: Run `./mvnw compile` or `mvn compile` before applying any change
31- **PREREQUISITE**: Project must compile successfully before applying Quarkus core improvements
32- **SAFETY**: If compilation fails, stop immediately — compilation failure is a blocking condition
33- **BLOCKING CONDITION**: Compilation errors must be resolved by the user before proceeding
34- **VERIFY**: Run `./mvnw clean verify` or `mvn clean verify` after applying improvements
35- **BEFORE APPLYING**: Read the reference for detailed rules, good/bad patterns, and constraints
36
37## When to use this skill
38
39- Review Java code for Quarkus application structure and CDI
40- Apply best practices for Quarkus configuration and beans
41- Improve CDI interceptors, events, or programmatic injection in Quarkus
42- Add virtual-thread configuration or tune CDI lifecycle
43
44## Workflow
45
461. **Read reference and assess project context**
47
48Read `references/401-frameworks-quarkus-core.md` and inspect the current project setup before proposing changes.
49
502. **Gather scope and decide target improvements**
51
52Identify requested outcomes, constraints, and the minimum safe set of changes to apply.
53
543. **Apply framework-aligned changes**
55
56Implement or refactor configuration/code following the reference patterns and project conventions.
57
584. **Run verification and report results**
59
60Execute appropriate build/tests and summarize what changed, what was verified, and any follow-up actions.
61
62## Reference
63
64For detailed guidance, examples, and constraints, see [references/401-frameworks-quarkus-core.md](references/401-frameworks-quarkus-core.md).
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