请教一个 springboot 和 mybatis 的问题

是这样的 我在看 spring 代码的时候 发现在 registerlistener 方法里的注释有写到不要在这里初始化 factorybean

AbstractApplicationContext.java

 protected void registerListeners() { // Register statically specified listeners first. for (ApplicationListener<?> listener : getApplicationListeners()) { getApplicationEventMulticaster().addApplicationListener(listener); } //↓↓↓↓↓↓↓↓↓↓↓↓注释在这里↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓ // Do not initialize FactoryBeans here: We need to leave all regular beans // uninitialized to let post-processors apply to them! String[] listenerBeanNames = getBeanNamesForType(ApplicationListener.class, true, false); for (String listenerBeanName : listenerBeanNames) { getApplicationEventMulticaster().addApplicationListenerBean(listenerBeanName); } // Publish early application events now that we finally have a multicaster... Set<ApplicationEvent> earlyEventsToProcess = this.earlyApplicationEvents; this.earlyApplicatiOnEvents= null; if (earlyEventsToProcess != null) { for (ApplicationEvent earlyEvent : earlyEventsToProcess) { getApplicationEventMulticaster().multicastEvent(earlyEvent); } } } 

但是我转去看 mybatis 的 sqlfactorybean 的时候 又看到他有实现 listener 接口

SqlSessionFactoryBean.java

public class SqlSessionFactoryBean implements FactoryBean<SqlSessionFactory>, InitializingBean, //↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓ ApplicationListener<ApplicationEvent> { private static final Logger LOGGER = LoggerFactory.getLogger(SqlSessionFactoryBean.class); private static final ResourcePatternResolver RESOURCE_PATTERN_RESOLVER = new PathMatchingResourcePatternResolver(); private static final MetadataReaderFactory METADATA_READER_FACTORY = new CachingMetadataReaderFactory(); ... 

我试着注册一个 SqlSessionFactoryBean 这确实会导致这个 factorybean 在 registerListeners()中被初始化
这是怎么一回事？难道是 mybatis 的实现不规范？？？还是我对那段注释的理解不对