处理器执行

// Allow post-processors to modify the merged bean definition.
synchronized (mbd.postProcessingLock) {
    if (!mbd.postProcessed) {
        try {
            // bean的后置处理器
            applyMergedBeanDefinitionPostProcessors(mbd, beanType, beanName);
        } catch (Throwable ex) {
            throw new BeanCreationException(mbd.getResourceDescription(), beanName,
                    "Post-processing of merged bean definition failed", ex);
        }
        mbd.postProcessed = true;
    }
}