问题
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 CoreBussinessLogicHandler implements GenericHandler<BussinessFile> {
//some bussiness logic
}
And
@Configuration
public class BussinessConfig {
@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. So 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 CoreBussinessLogicHandler 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 ?
回答1:
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.
回答2:
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";
}
来源:https://stackoverflow.com/questions/45931541/custom-annotation-is-not-working-on-spring-beans