[Solved] Why does this Spring Boot app fail to detect beans?public class App { @Bean public Service myService() { return new Service(); } }Assuming Service is a valid class, what is the likely cause? | Spring Boot

Spring Boot - Spring Annotations

Why does this Spring Boot app fail to detect beans?

public class App {
  @Bean
  public Service myService() { return new Service(); }
}

Assuming Service is a valid class, what is the likely cause?

AThe method name must start with 'get'

BThe @Bean method must be inside a @Configuration class

CThe Service class must be annotated with @Component

DThe @SpringBootApplication annotation disables @Bean methods

Step-by-Step Solution

Solution:

Step 1: Understand where @Bean methods belong
@Bean methods must be inside classes annotated with @Configuration or @SpringBootApplication (which includes @Configuration).
Step 2: Check if the class is annotated properly
The class lacks @Configuration or @SpringBootApplication, so the @Bean method won't be detected. Other options are incorrect.
Final Answer:
The @Bean method must be inside a @Configuration class -> Option B
Quick Check:
@Bean requires @Configuration class [OK]

Quick Trick: Place @Bean methods inside @Configuration classes [OK]

Common Mistakes:

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Why does this Spring Boot app fail to detect beans?