org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Only one AsyncAnnotationBeanPostProcessor may exist within the context. Offending resource: class path

org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Only one AsyncAnnotationBeanPostProcessor may exist within the context. Offending resource: class path resource [spring/spring.xml]

问题所在:

xml 配置文件中出现 重复的部分  ,嵌套的部分