Profile Annotation

The @Profile annotation in Spring Boot is a useful feature for defining beans that should only be created when specific profiles are active. Here’s a concise guide to using it:

1. Define Profiles: First, set up your profiles in your application.properties or application.yml file. For example:

   # application.properties
   spring.profiles.active=dev
   

   or

   # application.yml
   spring:
     profiles:
       active: dev
   

2. Use @Profile Annotation: Apply the @Profile annotation to the beans that you want to activate only for certain profiles. For instance:

   import org.springframework.context.annotation.Profile;
   import org.springframework.stereotype.Component;
   
   @Component
   @Profile("dev")
   public class DevService {
       // Development-specific implementation
   }
   
   @Component
   @Profile("prod")
   public class ProdService {
       // Production-specific implementation
   }
   

3. Activate Profiles: To activate profiles, you can set the spring.profiles.active property. This can be done in the application.properties or application.yml file, or as a command-line argument:

   java -jar myapp.jar --spring.profiles.active=prod
   

4. Conditional Bean Creation: You can also use @Profile in configuration classes to conditionally create beans:

   import org.springframework.context.annotation.Bean;
   import org.springframework.context.annotation.Configuration;
   import org.springframework.context.annotation.Profile;
   
   @Configuration
   public class AppConfig {
          
       @Bean
       @Profile("dev")
       public DevService devService() {
           return new DevService();
       }
          
       @Bean
       @Profile("prod")
       public ProdService prodService() {
           return new ProdService();
       }
   }
   

That’s it! With the @Profile annotation, you can easily manage different configurations and beans for different environments. Have fun coding! 🚀