I created a Maven project and I was putting the dependencies, I got the error in the pom related to the servlet dependency .
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
I'm using Java 7, Tomcat 7 and Vaadin 7.3.4