Why isn't eclipse compiling my web app?

When I start my Tomcat server, linked to my Java EE project, I get the error listed below. Two other people are using the same repository with Eclipse/Tomcat/Java and are not having any problems. It creates my package hierarchy, but the classes are missing. Tomcat develops my WEB-INF/classes/com folders, but the contents are all empty. Can anyone help me with this? Thank you.

SEVERE: Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping#0' defined in Servle开发者_Go百科tContext resource [/WEB-INF/LightStanza-servlet.xml]: Initialization of bean failed; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.lightfoundryllc.lightstanza.login.LoginValidator] for bean with name 'loginValidator' defined in ServletContext resource [/WEB-INF/LightStanza-servlet.xml]; nested exception is java.lang.ClassNotFoundException: com.lightfoundryllc.lightstanza.login.LoginValidator

thanks for your help. I set my environment variables for TOMCAT_HOME and PATH and things seem to be working now :).