servlet is not available

[faciolo]

Hi all, I'm new here. I've a problem with Tomcat. I work fine with tomcat 6.x at my work, but at home I have some problem to let tomcat works, with the same code.
At work i use Windows xp, eclipse and Tomcat, at home I'm using Ubuntu, tomcat and eclipse.

I get no errors during deploy, I can correctly see my index.html page, but when i try to log-in (and so I try to instantiate and process my servlet) i get this message in the browser:


HTTP Status 404 - Servlet EventController is not available

type Status report

message Servlet EventController is not available

description The requested resource (Servlet EventController is not available) is not available.
Apache Tomcat/6.0.20


If i look in my localhost.log i can see this:


17-ago-2010 17.49.14 org.apache.catalina.core.ApplicationContext log
INFO: Marking servlet EventController as unavailable
17-ago-2010 17.49.14 org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Allocate exception for servlet EventController
javax.servlet.ServletException: Error instantiating servlet class QBNuovo.web.EventController
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1139)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:809)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Thread.java:619)
17-ago-2010 17.54.26 org.apache.catalina.core.StandardWrapperValve invoke
INFO: Servlet EventController is currently unavailable
17-ago-2010 17.55.43 org.apache.catalina.core.StandardWrapperValve invoke
INFO: Servlet EventController is currently unavailable


can anyone help me please?