Spring Boot - Advanced Patterns
How can you combine multiple conditions in a custom auto-configuration class to activate only if a class exists and a bean is missing?
How can you combine multiple conditions in a custom auto-configuration class to activate only if a class exists and a bean is missing?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand combining conditions
Spring Boot allows multiple conditional annotations on a class to require all conditions to be true.Step 2: Evaluate options
@ConditionalOnProperty is for properties, not class and bean presence. @EnableAutoConfiguration does not take parameters for conditions. @ComponentScan filters classes but not for conditional activation.Final Answer:
Use both @ConditionalOnClass and @ConditionalOnMissingBean annotations on the class -> Option DQuick Check:
Multiple conditions = multiple conditional annotations [OK]
Quick Trick: Stack conditional annotations to combine conditions [OK]
Common Mistakes:
- Trying to combine conditions in one annotation
- Using @EnableAutoConfiguration incorrectly
- Confusing component scanning with conditional config
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