classformaterror

I have the same problem as you and found out that change from servlet-api to javax.servlet.api will fix the problem. Hope this help. Please note that, I am using Juno Eclipse, Tomcat 7, Dynamic Web Module 3.0, and JDK 1.7. <dependency> <groupId>com.sun.faces</groupId> <artifactId>jsf-api</artifactId> <version>2.1.13</version> </dependency> <dependency> <groupId>com.sun.faces</groupId> <artifactId>jsf-impl</artifactId> <version>2.1.13</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.0.1</version> </dependency>