Spring / Spring Boot
What does the spring annotation @ConditionalOnMissingBean used for?
The @ConditionalOnMissingBean annotation is a spring conditional annotation for registering beans only when they are not already in the application context.
The above bean will get loaded by Spring only if there is no other bean of this type present in the context. On the other hand, if there is already a bean of the type SomeBean present in the application context, the above bean will not be created.
Specifying a fallback bean which gets only loaded as backup/default if there is no bean of the same type present. The classical example would be using an in-memory database if there is no real database configured.
Specifying a default bean which allows being overridden in the case that a more specific bean of the same type is present in the context. One of the examples would be using a default authentication mechanism unless someone decides to replace it with his own custom authentication.
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