ecco l'errore che mi da:

codice:
9-set-2010 12.37.34 org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() for servlet [jsp] in context with path [/Test] threw exception [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
] with 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

    at org.apache.jsp.index_jsp.<init>(index_jsp.java:15)
    at sun.reflect.GeneratedConstructorAccessor7.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at java.lang.Class.newInstance0(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:123)
    at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:145)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:201)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:163)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:108)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:401)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:242)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:267)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:245)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:260)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
ho provato a riavviare il pc, a riavviare tomcat e a fermarlo..

il servizio risulta attivo dal gestore dei servizi di windows