Salesforce Developer Community

i was tring to do the force.com for google app tutorial (http://wiki.developerforce.com/index.php/Force.com_for_Google_App_Engine_User_Guide_Java). With the hello world app i don't have problem but when i try to generate a new record i have this error:

HTTP ERROR 404

Problem accessing /provaent. Reason:

Servlet class provaent.ProvaentServlet is not a javax.servlet.Servlet

Caused by:

javax.servlet.UnavailableException: Servlet class provaent.ProvaentServlet is not a javax.servlet.Servlet

at org.mortbay.jetty.servlet.ServletHolder.checkServletType(ServletHolder.java:362)

at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:243)

at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)

at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:685)

at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)

at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)

at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)

at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)

at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)

at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)

at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)

at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)

at org.mortbay.jetty.Server.doStart(Server.java:224)

at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)

at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:185)

at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:147)

at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:219)

at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:164)

at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)

at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113)

at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89)

i have try also with partner library but the error is the same