in Netbeans Project : java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener

1. Close Netbeans IDE.
2. Close all the java processes
3. Open NetBeans IDE
4. Right Click on your project : Clean and Build

Resources:
http://stackoverflow.com/questions/2249697/org-springframework-beans-factory-cannotloadbeanclassexception-cannot-find-clas