CODEWITHSUNDEEP
javaspringspring-mvcspring-integrationspring-annotations
Rohan Mulay
Rohan Mulay

Reputation: 349

Custom annotation is not working on spring Beans

I have created my new custom annotation @MyCustomAnnotation:

@Target({ElementType.METHOD, ElementType.TYPE, ElementType.FIELD})
@Retention(RUNTIME)
public @interface MyCustomAnnotation {
}

I applied that annotation on component and bean. Here is the code,

@MyCustomAnnotation
@Component
public class CoreBusinessLogicHandler implements GenericHandler<BusinessFile> {
    // some business logic
}

And

@Configuration
public class BusinessConfig {

    @Autowired
    private CoreIntegrationComponent coreIntegrationComponent;

    @MyCustomAnnotation
    @Bean(name = INCOMING_PROCESS_CHANNEL)
    public MessageChannel incomingProcessChannel() {
        return coreIntegrationComponent.amqpChannel(INCOMING_PROCESS_CHANNEL);
    }
    
    //some other configurations
}

Now I want all the beans annotated with @MyCustomAnnotation. Here is the code:

import org.springframework.context.ApplicationContext;
    
@Configuration
public class ChannelConfig {
    
      @Autowired
      private ApplicationContext applicationContext;
    
      public List<MessageChannel> getRecipientChannel(CoreIntegrationComponent coreIntegrationComponent) {
    
      String[] beanNamesForAnnotation = applicationContext.getBeanNamesForAnnotation(MyCustomAnnotation.class);
      //Here in output I am getting bean name for CoreBusinessLogicHandler Only.

    }
}

My question is why I am not getting Bean with name 'INCOMING_PROCESS_CHANNEL' as it has @MyCustomAnnotation? If I want to get bean with name 'INCOMING_PROCESS_CHANNEL' what code changes should I do?

Upvotes: 4

Views: 7773

Answers (2)

Avinash
Avinash

Reputation: 4289

You have to use AnnotationConfigApplicationContext instead of ApplicationContext

Here is a working example: 

@SpringBootApplication
@Configuration
public class DemoApplication {

    @Autowired
    public AnnotationConfigApplicationContext ctx;

    @Bean
    public CommandLineRunner CommandLineRunner() {
        return (args) -> {
            Stream.of(ctx.getBeanNamesForAnnotation(MyCustomAnnotation.class))
                    .map(data -> "Found Bean with name : " + data)
                    .forEach(System.out::println);
        };
    }

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

@Target({ElementType.METHOD, ElementType.TYPE, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@interface MyCustomAnnotation{
}

@MyCustomAnnotation
@Component
class Mycomponent {
    public String str = "MyComponentString";
}

Upvotes: 0

Rafal G.
Rafal G.

Reputation: 4432

This happens because your bean does not receive this annotation as you have placed it on a "bean definition configuration". So it is available but only through BeanFactory and beanDefinitions. You can either put the annotation on your bean class or write a custom method that would do the searching using bean factory.

See the accepted answer here.

Upvotes: 1

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