https://www.baeldung.com/spring-null-safety-annotations
    @NonNullApi
    @NonNullFields
    package mypackage;

    import org.springframework.lang.NonNullApi;
    import org.springframework.lang.NonNullFields;

2023
https://habr.com/ru/articles/778064/
https://gorkemgok.com/enable-annotations-for-better-spring-libraries-5a467a028e06
    https://github.com/gorkemgok/enabler-annotation-example
CodeDecode - Difference between @component & @bean annotations in Spring boot
    https://www.youtube.com/watch?v=6X_Xx0CyCqE
    ! @Component - class-level, @Bean - method-level
2019
https://dzone.com/articles/5-spring-annotations-every-java-developer-should-k
https://habr.com/ru/post/439594/
https://dzone.com/refcardz/spring-annotations

2016
https://readlearncode.com/2016/02/13/insights-from-stackoverflow-most-voted-for-spring-4-questions/

    <bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor"/>
    <bean class="org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor"/>

@Order
https://www.baeldung.com/spring-order