Spring Boot - Fundamentals
You want to create a custom auto-configuration that only activates if a specific class is on the classpath. Which annotation should you use?
You want to create a custom auto-configuration that only activates if a specific class is on the classpath. Which annotation should you use?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Identify the conditional annotation for class presence
@ConditionalOnClassactivates configuration only if the specified class is present on the classpath.Step 2: Differentiate from other annotations
@EnableAutoConfigurationenables auto-config globally;@ComponentScanscans beans;@ConfigurationPropertiesbinds properties.Final Answer:
@ConditionalOnClass -> Option AQuick Check:
Use @ConditionalOnClass to activate config by class presence [OK]
Quick Trick: Use @ConditionalOnClass to conditionally enable auto-config [OK]
Common Mistakes:
- Confusing @EnableAutoConfiguration with conditional activation
- Using @ComponentScan to control auto-config activation
- Misusing @ConfigurationProperties for conditional logic
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