Your webapp has servletcontainer specific libraries like servlet-api.jar file in its /WEB-INF/lib. This is not right.
Remove them all.
The /WEB-INF/lib should contain only the libraries specific to the webapp, not to the servletcontainer. The servletcontainer (like Tomcat) is the one who should already provide the servletcontainer specific libraries.
If you supply libraries from an arbitrary servletcontainer of a different make/version, you'll run into this kind of problems because your webapp wouldn't be able to run on a servletcontainer of a different make/version than where those libraries are originated from.
How to solve: In Eclipse Right click on the project in eclipse Properties -> Java Build Path -> Add library -> Server Runtime Library -> Apache Tomcat
Im Maven Project:-
add follwing line in pom.xml file
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>${default.javax.servlet.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>${default.javax.servlet.jsp.version}</version>
<scope>provided</scope>
</dependency>