org.springframework.web.filter.DelegatingFilterProxy is not assignable to javax.servlet.Filter

异常信息

'org.springframework.web.filter.DelegatingFilterProxy' is not assignable to javax.servlet.Filter'

异常情况

<filter>
	<filter-name>springSecurityFilterChain</filter-name>
	<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
	(filter-class红波浪线)
</filter>

异常原因

缺少servlet-api依赖

解决方法

<dependency>
     <groupId>javax.servlet</groupId>
     <artifactId>servlet-api</artifactId>
     <version>2.5</version>
     <scope>provided</scope>
 </dependency>