tomcat启动报错
org.apache.catalina.core.StandardContext.filterStart Exception starting filter
错误原因：Tomcat8.5，我用maven导入如下jar，用版本3.0.1就好了
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
