Spring Boot - Advanced Patterns
Which annotation is essential to enable conditional bean creation in a custom auto-configuration class?
Which annotation is essential to enable conditional bean creation in a custom auto-configuration class?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify annotation for conditional bean creation
@ConditionalOnMissingBean tells Spring Boot to create a bean only if it is not already defined.Step 2: Eliminate unrelated annotations
@EnableAutoConfiguration enables auto-config but does not condition bean creation. @SpringBootApplication and @ComponentScan serve other purposes.Final Answer:
@ConditionalOnMissingBean -> Option BQuick Check:
Conditional bean creation = @ConditionalOnMissingBean [OK]
Quick Trick: Use @ConditionalOnMissingBean to avoid duplicate beans [OK]
Common Mistakes:
- Confusing @EnableAutoConfiguration with conditional bean creation
- Using @SpringBootApplication instead
- Forgetting to use conditional annotations
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