The @Primary annotation in Spring indicates which bean to prefer when multiple candidates qualify for autowiring, helping to avoid ambiguity in dependency injection.
Without @Primary, Spring would throw a NoUniqueBeanDefinitionException when multiple beans of the same type exist, making it essential for complex applications.
The @Primary annotation works at the level of bean definitions, prioritizing which bean to use during injection when multiple candidates are available.
In scenarios where different implementations serve the same purpose, @Primary provides a clear default option, ensuring consistent behavior across the application.
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