Final answer:
To tell an auto-configuration to back away when a bean exists in Spring Framework, the ConditionalOnMissingBean annotation is used. This allows default configurations to be overridden by application-specific beans.
Step-by-step explanation:
In the context of Spring Framework for Java Development, when you want an auto-configuration to be ignored if a certain bean already exists, you can use the ConditionalOnMissingBean annotation. This is useful for defining default configurations that should back off if the application has defined its own version of a bean.
To apply this in practice, you would annotate your auto-configuration bean method with ConditionalOnMissingBean. Here's a simple example:
Bean
ConditionalOnMissingBean
public MyBean myBean() {
return new MyBean();
}
This code snippet tells Spring to only create 'MyBean' if there isn't already a bean of that type in the context. This feature is part of what makes Spring's auto-configuration so flexible and powerful. Developers can define default behavior that non-intrusively adapts to the application's specific requirements.
Hence, to tell an auto-configuration to back away when a bean exists in Spring Framework, the ConditionalOnMissingBean annotation is used.