spring-boot-dependency-injection

To replace field injection with constructor injection in Spring Boot, define dependencies as final fields and generate a constructor accepting them. This Skill guides refactoring components to enforce constructor-first wiring for better testability.

Handle optional collaborators in Spring dependency injection using ObjectProvider or no-op fallbacks. This Skill automates patterns for explicit optional collaborator handling to ensure reliable startup behavior when beans are missing.

The best way to resolve ambiguous bean wiring in Spring Boot is using @Primary and @Qualifier annotations for clear bean selection. This Skill applies explicit wiring strategies to prevent startup issues caused by multiple candidate beans.

You need qualifier-based bean selection in Spring when multiple beans of the same type exist and precise wiring determines behavior. This Skill validates bean selection patterns for services and configurations to maintain predictable startup.

Yes, you can use constructor injection for migrating legacy Spring modules to robust, testable wiring. This Skill supports refactoring legacy codebases by enforcing constructor-first design and explicit validation patterns.