Use when building or reviewing Micronaut applications — Micronaut.run bootstrap, @Singleton/@Prototype, @Factory beans, @ConfigurationProperties, environments, @Requires, @Controller vs services, @Scheduled, graceful shutdown, @ExecuteOn for blocking work, and Jakarta-consistent APIs. This should trigger for requests such as Review Java code for Micronaut application structure and beans; Apply best practices for Micronaut configuration, @Requires, and factories; Improve scheduling, shutdown, or…
Use when building or reviewing Micronaut applications — Micronaut.run bootstrap, @Singleton/@Prototype, @Factory beans, @ConfigurationProperties, environments, @Requires, @Controller vs services, @Scheduled, graceful shutdown, @ExecuteOn for blocking work, and Jakarta-consistent APIs.
This should trigger for requests such as Review Java code for Micronaut application structure and beans; Apply best practices for Micronaut configuration, @Requires, and factories; Improve scheduling, shutdown, or threading in Micronaut services. ; Review Micronaut dependency injection scopes and factories; Configure Micronaut @Requires conditions for environments.
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Skill metadata
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Version0.18.0
LicenseApache-2.0
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author
Juan Antonio Breña Moral
version
0.18.0
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skill mdSKILL.md3,507 B
docsSUMMARY.md712 B
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SKILL.md
Micronaut Core Guidelines
Apply Micronaut core guidelines for DI, configuration, HTTP adapters, and operations.
What is covered in this Skill?
Thin main with Micronaut.run(Application.class, args)
Bean scopes: @Singleton, @Prototype; request scope only when justified
Constructor injection with jakarta.inject.Inject
@Factory for third-party or explicit bean construction
@ConfigurationProperties (grouped settings) vs scattered @Property
@Requires and environments instead of env branching in domain code
Thin @Controller types delegating to @Singleton services
@Scheduled with explicit failure visibility
@ExecuteOn(TaskExecutors.BLOCKING) (or virtual-thread executors) for blocking I/O off the event loop
Netty graceful shutdown properties
AOP interceptors for cross-cutting concerns
Scope: Apply recommendations based on the reference rules and good/bad code examples.
Constraints
Before applying Micronaut 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 Micronaut core improvements
SAFETY: If compilation fails, stop immediately — compilation failure is a blocking condition
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 Micronaut application structure and beans
Apply best practices for Micronaut configuration, @Requires, and factories
Improve scheduling, shutdown, or threading in Micronaut services
Review Micronaut dependency injection scopes and factories
Configure Micronaut @Requires conditions for environments
Workflow
Read reference and assess project context
Read references/501-frameworks-micronaut-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/501-frameworks-micronaut-core.md](references/501-frameworks-micronaut-core.md).
