[Solved] You want to create a custom auto-configuration that only creates a bean if no other bean of the same... Which combination of annotations should you use on your configuration class and bean method? | Spring Boot

Spring Boot - Advanced Patterns

You want to create a custom auto-configuration that only creates a bean if no other bean of the same type exists and a property app.feature.enabled is true. Which combination of annotations should you use on your configuration class and bean method? A) @Configuration on class, @ConditionalOnMissingBean and @ConditionalOnProperty on bean method B) @Component on class, @ConditionalOnBean on bean method C) @Configuration on class, @ConditionalOnClass on bean method D) @EnableAutoConfiguration on class, no conditions on bean method

A@Configuration on class, @ConditionalOnClass on bean method

B@Component on class, @ConditionalOnBean on bean method

C@Configuration on class, @ConditionalOnMissingBean and @ConditionalOnProperty on bean method

D@EnableAutoConfiguration on class, no conditions on bean method

Step-by-Step Solution

Solution:

Step 1: Identify class-level annotation for config
@Configuration is correct to mark a class as configuration for auto-configuration.
Step 2: Choose bean method conditions
@ConditionalOnMissingBean ensures no existing bean of the type exists; @ConditionalOnProperty checks the property is true.
Step 3: Exclude incorrect options
@Component is generic, @ConditionalOnBean requires existing bean, @ConditionalOnClass checks class presence, not bean existence, @EnableAutoConfiguration is for main app class.
Final Answer:
@Configuration on class, @ConditionalOnMissingBean and @ConditionalOnProperty on bean method -> Option C
Quick Check:
Missing bean + property conditions = @Configuration on class, @ConditionalOnMissingBean and @ConditionalOnProperty on bean method [OK]

Quick Trick: Use @ConditionalOnMissingBean and @ConditionalOnProperty together [OK]

Common Mistakes:

Using @ConditionalOnBean instead of @ConditionalOnMissingBean
Putting conditions on class instead of bean method
Confusing @EnableAutoConfiguration with config class annotation

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More Spring Boot Quizzes

Which combination of annotations should you use on your configuration class and bean method?

Step 1: Identify class-level annotation for config

Step 2: Choose bean method conditions

Step 3: Exclude incorrect options

Final Answer:

Quick Check:

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