L'errore che mi da è:

codice:
HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: java.lang.Error: Unresolved compilation problems: 
    org.apache.tomcat cannot be resolved to a type
    InstanceManager cannot be resolved to a type
    The method getInstanceManager(ServletConfig) from the type InstanceManagerFactory refers to the missing type InstanceManager

    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:273)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

root cause

java.lang.Error: Unresolved compilation problems: 
    org.apache.tomcat cannot be resolved to a type
    InstanceManager cannot be resolved to a type
    The method getInstanceManager(ServletConfig) from the type InstanceManagerFactory refers to the missing type InstanceManager

    org.apache.jsp.index_jsp.<init>(index_jsp.java:15)
    sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    java.lang.reflect.Constructor.newInstance(Unknown Source)
    java.lang.Class.newInstance0(Unknown Source)
    java.lang.Class.newInstance(Unknown Source)
    org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:145)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.2 logs.
Apache Tomcat/7.0.2
se digito: http://localhost:8080/ vedo la homepageche mi dice:If you're seeing this page via a web browser, it means you've setup Tomcat successfully. Congratulations!

forse il problema non è tomcat ma eclipse? tutti i miei progetti si trovano nella cartella
C:\Programmi\eclipse\workspace

non nella root di apache

infatti se digito http://localhost:8080/Test/ dove Test è il nome della cartella di eclipse dove è presente un mio progetto ottengo l'errore sopra riportato..