pom.xml依赖中含有

<dependency>
	<groupId>javax.servlet</groupId>
	<artifactId>javax.servlet-api</artifactId>
	<version>3.1.0</version>
	<scope>provided</scope>
</dependency>

缺少

<dependency>
	<groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
	<version>2.2</version>
	<scope>provided</scope>
</dependency>

添加即可

确定scope为provided，tomcat本身含有这2个包，如果设置为默认的，会将这两个jar包打包进去，就会造成重复