GAE No forced path servlet for xxx.jsp

Question

This is my first post on stackoverflow. Learning how to use Google App Engine. The program works fine on my local machine but when I upload it online it fails to run. my hunch is some issue with web.xml

<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
 <servlet>
     <servlet-name>home-jsp</servlet-name>
     <jsp-file>/home.jsp</jsp-file>
 </servlet>
 <servlet-mapping>
     <servlet-name>home-jsp</servlet-name>
     <url-pattern>/home.jsp</url-pattern>
 </servlet-mapping>

 <servlet>
    <servlet-name>watch</servlet-name>
    <servlet-class>watch.WatchServlet</servlet-class>
 </servlet>
 <servlet-mapping>
     <servlet-name>watch</servlet-name>
    <url-pattern>/</url-pattern>
 </servlet-mapping>

 <servlet>
     <servlet-name> Prefs</servlet-name>
     <servlet-class>watch.PrefsServlet</servlet-class>
 </servlet>
 <servlet-mapping>
     <servlet-name>Prefs</servlet-name>
     <url-pattern>/prefs</url-pattern>
 </servlet-mapping>

 <security-constraint>
     <web-resource-collection>
         <web-resource-name>prefs</web-resource-name>
         <url-pattern>/prefs</url-pattern>
     </web-resource-collection>
     <auth-constraint>
         <role-name>*</role-name>
     </auth-constraint>
 </security-constraint>
</web-app>

Looking at the Log entry I see

    2013-10-27 13:46:54.348
Failed startup of context com.google.apphosting.utils.jetty.RuntimeAppEngineWebAppContext@7daf3e{/,/base/data/home/apps/s~fridoswatch/1.371221215746279551}
java.lang.IllegalStateException: No forced path servlet for /home.jsp
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:679)
    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 com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:219)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:194)
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:134)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:446)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:435)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:442)
    at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:186)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:306)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:298)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:439)
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
    at java.lang.Thread.run(Thread.java:724)

and the critical error log says

Uncaught exception from servlet
javax.servlet.UnavailableException: Initialization failed.
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:228)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:194)
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:134)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:446)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:435)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:442)
    at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:186)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:306)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:298)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:439)
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
    at java.lang.Thread.run(Thread.java:724)

been banging my head against this for two days now. Any help with this would be awesome for my sanity.

Answer 1

You have both a servlet and a servlet-mapping for the URL /home.jsp in your web.xml. Remove one of them.