What does the spring annotation @ConditionalOnMissingBean do?

Question

I am trying to start a springboot application where this annotation has been used. When I try to start the application it gives me the following error:

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Answer 1

The @ConditionalOnMissingBean annotation is a spring conditional annotation for registering beans only when they are not already in the application context.

See the documentation: https://docs.spring.io/spring-boot/docs/2.0.0.RELEASE/api/org/springframework/boot/autoconfigure/condition/ConditionalOnMissingBean.html