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我有一个ApplicationListener使用 a创建的应用程序FactoryBean（创建很复杂，所以我FactoryBean为它创建了一个），并且FactoryBean.isSingleton()返回true.

在 Spring 3 中，它具有魅力，但现在我正在升级到 Spring 5.3，但它不起作用。我诊断了很多，我在org.springframework.context.support.ApplicationListenerDetector课堂上发现了它。

该类中有两种方法

@Override
public void postProcessMergedBeanDefinition(RootBeanDefinition beanDefinition, Class<?> beanType, String beanName) {
    if (ApplicationListener.class.isAssignableFrom(beanType)) {
        this.singletonNames.put(beanName, beanDefinition.isSingleton());
    }
}

@Override
public Object postProcessAfterInitialization(Object bean, String beanName) {
    if (bean instanceof ApplicationListener) {
        // potentially not detected as a listener by getBeanNamesForType retrieval
        Boolean flag = this.singletonNames.get(beanName);
        if (Boolean.TRUE.equals(flag)) {
            // singleton bean (top-level or inner): register on the fly
            this.applicationContext.addApplicationListener((ApplicationListener<?>) bean);
        }
        else if (Boolean.FALSE.equals(flag)) {
            if (logger.isWarnEnabled() && !this.applicationContext.containsBean(beanName)) {
                // inner bean with other scope - can't reliably process events
                logger.warn("Inner bean '" + beanName + "' implements ApplicationListener interface " +
                        "but is not reachable for event multicasting by its containing ApplicationContext " +
                        "because it does not have singleton scope. Only top-level listener beans are allowed " +
                        "to be of non-singleton scope.");
            }
            this.singletonNames.remove(beanName);
        }
    }
    return bean;
}

虽然我FactoryBean.isSingleton()返回true了，但是第一个方法没有为 a 返回的 bean 调用FactoryBean，因此第二个方法没有ApplicationListener在ApplicationContext.

所以现在我想看看是 Spring 5.3 的一个 it 错误，还是我错过了升级 Spring 版本的一些额外的东西？

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