SpringBoot Spring-boot listener’s @autowire is not work on recent versions

Spring-boot listener’s @autowire is not working on recent versions

sample code link https://github.com/maafshar/listenerautowire

When using 2.3.1.RELEASE of Spring-boot everything is ok.

@WebListener public class Listener implements ServletContextListener {
@Autowired private Environment env;
@Override public void contextInitialized(ServletContextEvent sce) { 
    try {
          if (env == null) // is false

When using 2.6.2 of Spring-boot the env will be null

change pom.xml

  <parent>
        <groupId>org.springframework.boot</groupId>    
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.1.RELEASE</version><!-- ********************* 2.3.1.RELEASE - 2.6.2 ********************* -->
      <relativePath/>
 </parent>

Comment From: snicoll

Thanks for the sample. Autowiring isn't available as of Spring Boot 2.4.0 already. I've only found this section in the release notes but I am not sure it is related.

Comment From: maafshar

replacing @WebListener with @Component solved the problem, but as you mentioned from 2.4.0 the problem exists.

Comment From: wilkinsona

As @snicoll suspected, this is due to the changes in Spring Boot 2.4 to allow @WebListeners to register servlets and filters. The change in 2.4 requires the Servlet container to be responsible for creating the listener so Spring-based dependency injection is no longer available.

Generally speaking, @ServletComponentScan is intended for registering third-party components where you can't modify the code. If you're in a position to use @Autowired and the like then you should use @Component. An exception to this is where you need to be able to register servlets and filters from your listener. @WebListener should be used in this case.

I've updated the release notes for 2.4.