nested exception is java.lang.IllegalStateException: No ServletContext set

今天在整合ssm框架的时候，出现了下面的问题：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'resourceHandlerMapping' defined in class path resource [org/springframework/web/servlet/config/annotation/DelegatingWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.HandlerMapping]: Factory method 'resourceHandlerMapping' threw exception; nested exception is java.lang.IllegalStateException: No ServletContext set

由于是No ServletContext set 导致的，所以很有可能就是SpringMvc的配置类出现了问题，所以就去看了ServletContainerInitConfig 和SpringMvcConfig和SpringConfig这三个类，后面的时候在SpringConfig中发现了这个问题：

我在包扫描的时候，使用的是这个：扫描全部然后排除controller

@ComponentScan(value = "com.itheima",excludeFilters = @ComponentScan.Filter(type = FilterType.ANNOTATION,classes = Controller.class))

所以我就改成了精准扫描：

@ComponentScan({"com.itheima.service","com.itheima.dao"})

于是问题就没有了。