Solution:Step 1: Understand @Profile on @Bean methods@Profile works on @Bean methods only if the containing class is annotated with @Configuration.Step 2: Identify missing @ConfigurationIf the class lacks @Configuration, @Profile on methods is ignored and beans are created regardless of profile.Fina

[Solved] A developer writes:@Profile("prod") @Bean public DataSource dataSource() { return new DataSource(); }But the bean is created even when the active profile is 'dev'. What is the likely mistake? | Spring Boot

Spring Boot - Spring Annotations

A developer writes:

@Profile("prod")
@Bean
public DataSource dataSource() { return new DataSource(); }

But the bean is created even when the active profile is 'dev'. What is the likely mistake?

AThe @Profile annotation should be on the configuration class, not the method.

BThe @Profile annotation is ignored on @Bean methods.

CThe @Profile annotation is placed on the method, but the configuration class is not annotated with @Configuration.

DThe active profile is not set correctly.

Step-by-Step Solution

Solution:

Step 1: Understand @Profile on @Bean methods
@Profile works on @Bean methods only if the containing class is annotated with @Configuration.
Step 2: Identify missing @Configuration
If the class lacks @Configuration, @Profile on methods is ignored and beans are created regardless of profile.
Final Answer:
The @Profile annotation is placed on the method, but the configuration class is not annotated with @Configuration. -> Option C
Quick Check:
@Profile on @Bean requires @Configuration class [OK]

Quick Trick: Use @Configuration on class when @Profile on @Bean methods [OK]

Common Mistakes:

Missing @Configuration on config class
Thinking @Profile ignored on @Bean methods
Incorrect active profile setting

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A developer writes:

Step 1: Understand @Profile on @Bean methods

Step 2: Identify missing @Configuration

Final Answer:

Quick Check:

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