org.springframework.web.context.ContextLoaderListener

Error: java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener

The Spring projects has many modules.

1. Spring Web MVC (spring-webmvc.jar)
2. Spring Aop (spring-aop.jar)
3. Spring Beans (spring-beans.jar)
4. Spring Context (spring-context.jar)
5. Spring Core (spring-core.jar)
6. Spring Dao (spring-dao.jar)
7. Spring Hibernate (spring-hibernate3.jar)
8. Spring Ibatis (spring-ibatis.jar)
9. Spring Jca (spring-jca.jar)
10. Spring Jdbc (spring-jdbc.jar)
11. Spring Jdo (spring-jdo.jar)
12. Spring Jms (spring-jms.jar)
13. Spring Jms (spring-jpa.jar)
14. Spring Jmx (spring-jmx.jar)
15. Spring Portlet (spring-portlet.jar)
16. Spring Remoting (spring-remoting.jar)
17. Spring Struts (spring-struts.jar)
18. Spring Support (spring-support.jar)
19. Spring Toplink (spring-toplink.jar)
20. Spring Web (spring-web.jar)
21. Spring Aspects (spring-aspects.jar)

Solution: My project was missing Spring-web.jar  Two ways to fix this.
1. Add Spring-web.jar to the WEB-INF/lib dir
2. Add a dependency tag to the pom.xml file (preferred).  At this time I am using Spring 2.5.4

    <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>2.5.4</version>
        </dependency>