import org.springframework.core.annotation.AnnotationUtils;
import java.lang.annotation.*;
import java.lang.reflect.Method;

@Retention(RetentionPolicy.RUNTIME)
@interface MyTool {
    String value();
}

interface MyUseCase {
    @MyTool("hello")
    void doSomething();
}

class MyUseCaseImpl implements MyUseCase {
    public void doSomething() { }
}

public class TestAnnotation {
    public static void main(String[] args) throws Exception {
        Method m = MyUseCaseImpl.class.getDeclaredMethod("doSomething");
        MyTool ann = AnnotationUtils.findAnnotation(m, MyTool.class);
        System.out.println("Annotation found: " + (ann != null ? ann.value() : "null"));
    }
}