Which of the following is the correct way to declare a custom auto-configuration class in Spring Boot?

easy📝 Syntax Q3 of 15

Spring Boot - Advanced Patterns

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

B@Component public class MyAutoConfig { public MyService myService() { return new MyService(); } }

C@Service public class MyAutoConfig { @Bean public MyService myService() { return new MyService(); } }

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

Step-by-Step Solution

Solution:

Step 1: Identify correct annotation for configuration class
Custom auto-configuration classes must be annotated with @Configuration to define beans properly.
Step 2: Check bean method and class annotations
@Configuration public class MyAutoConfig { @Bean public MyService myService() { return new MyService(); } } uses @Configuration and @Bean correctly. Options B and C use @Component or @Service which are not for configuration. public class MyAutoConfig { @Bean public MyService myService() { return new MyService(); } } lacks any class-level annotation.
Final Answer:
@Configuration public class MyAutoConfig { @Bean public MyService myService() { return new MyService(); } } -> Option A
Quick Check:
Auto-config class = @Configuration + @Bean methods [OK]

Quick Trick: Use @Configuration on auto-config classes with @Bean methods [OK]

Common Mistakes:

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