Spring method annotations null

Question

I'am trying to get the methods that are using a custom annotation, but when i get the method, i can't get any annotation from it, every paramter that cites "annotation" is null.

My annotation:

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface MyAnnotation {
    String value() default "";
}

Class using annotation:

public interface Interface {
    void doSomething();
}

@Repository
public class ImplementationClass implements Interface {
    
    @Override
    @MyAnnotation("some_value")
    public void doSomething() {

    }
}

Getting annotation:

@Configuration
public class MyAnnotationScanner implements ApplicationContextAware {

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {

        for (String beanName : applicationContext.getBeanNamesForAnnotation(Repository.class)) {
            Object bean = applicationContext.getBean(beanName);
            for (Method beanMethod : bean.getClass().getDeclaredMethods()) {
                if (beanMethod.isAnnotationPresent(MyAnnotation.class))
                    // do something
            }
        }
    }
}

I'm able to get the correct method, but when i check with intellij it has no annotations and the "isAnnotationPresent" method always returns false.

`@Repository` annotated class is automatically proxiedby `Spring` — Alex, Sep 23 '21 at 18:56
See some of the techniques in https://stackoverflow.com/questions/8121551/is-it-possible-to-unproxy-a-spring-bean — Sotirios Delimanolis, Sep 23 '21 at 19:02
With this AopUtils class, i tried using all the "isProxy" methods, none of them returned true. "obj instanceof Advised" returned false too — Toniotti, Sep 23 '21 at 19:08
The bean is a proxy, as Sotirios said. Maybe you can use BeanPostProcessor, which can do something with the bean before it's proxied. https://docs.spring.io/spring-framework/docs/current/reference/html/core.html#beans-factory-extension — Barracuda, Sep 23 '21 at 19:09

score 0 · Answer 1 · edited Sep 23 '21 at 23:31

0

I found a solution in using the AnnotationUtils.findAnnotation() method.

Basically for every beanMethod, you get the annotation using the findAnnotation method.

var annotation = AnnotationUtils.findAnnotation(beanMethod, MyAnnotation.class);

edited Sep 23 '21 at 23:31

Matthias Steinbauer

1,786
11
24

answered Sep 23 '21 at 19:17

Toniotti

77
7

score 0 · Answer 2 · answered Jul 13 '22 at 10:03

I was using isAnnotationPresent method but it was always returning false. I have then used AnnotationUtils.findAnnotation(method, <Annotation.class>)

Here is how I am finding method that is using custom annotation:

for (String beanName : applicationContext.getBeanDefinitionNames()) {
        Object bean = applicationContext.getBean(beanName);
        Class<?> objClass = bean.getClass();
        for (Method m : objClass.getDeclaredMethods()) {

            Annotation a = AnnotationUtils.findAnnotation(m, <Annotation_NAME>.class);
            if (a != null) {

Spring method annotations null

2 Answers2