Custom Annotations with Retention

import java.lang.annotation.*;
import java.lang.reflect.*;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@interface AuditLog {
    String action();
    String level() default "INFO";
}

@Retention(RetentionPolicy.SOURCE)
@Target(ElementType.TYPE)
@interface Service {
    String value();
}

@Service("userService")
class UserService {

    @AuditLog(action = "create", level = "DEBUG")
    public void createUser(String name) {
        System.out.println("Creating user: " + name);
    }

    @AuditLog(action = "delete")
    public void deleteUser(int id) {
        System.out.println("Deleting user: " + id);
    }
}

public class CustomAnnotations {
    public static void main(String[] args) throws Exception {
        Class<?> clazz = UserService.class;

        if (clazz.isAnnotationPresent(Service.class)) {
            Service svc = clazz.getAnnotation(Service.class);
            System.out.println("Service: " + svc.value());
        }

        for (Method method : clazz.getDeclaredMethods()) {
            if (method.isAnnotationPresent(AuditLog.class)) {
                AuditLog log = method.getAnnotation(AuditLog.class);
                System.out.println(method.getName() +
                    " -> action=" + log.action() +
                    ", level=" + log.level());
            }
        }
    }
}