[Solved] Why does this custom auto-configuration fail to create a bean?@Configuration public class MyAutoConfig { @Bean private MyService myService() { return new MyService(); } } | Spring Boot

Spring Boot - Advanced Patterns

Why does this custom auto-configuration fail to create a bean?

@Configuration
public class MyAutoConfig {
  @Bean
  private MyService myService() {
    return new MyService();
  }
}

AClass must be annotated with @Component instead

BBean methods must be public, private is invalid

CMissing @ConditionalOnMissingBean annotation

DMyService class is not annotated with @Service

Step-by-Step Solution

Solution:

Step 1: Check bean method visibility
Spring requires @Bean methods to be public to detect and invoke them.
Step 2: Evaluate other options
@ConditionalOnMissingBean is optional. @Component is not for config classes. @Service on MyService is unrelated to bean creation here.
Final Answer:
Bean methods must be public, private is invalid -> Option B
Quick Check:
@Bean methods must be public [OK]

Quick Trick: Make @Bean methods public to be detected by Spring [OK]

Common Mistakes:

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