How to Resolve Multiple Beans of the Same Type in Spring Boot - Using @Qualifier and @Primary and Name Resolution Priority
Registering multiple implementations of the same interface, such as payment methods or notification channels, causes a NoUniqueBeanDefinitionException. This article organizes explicit specification with @Qualifier, default specification with @Primary, the priority when both conflict, and fallback resolution by parameter name using practical example code, and implements a configuration where implementations can be switched via application.yml or profiles.