Google App Engine won't deploy when using <%@ include file="/file.jsp" %>

[user1691063 via StackOverflow]

The project compiles and runs perfectly on my local computer. Whenever I try to deploy I get this error:

Unable to update:
com.google.appengine.tools.admin.JspCompilationException: Failed to compile the      generated JSP java files.
at com.google.appengine.tools.admin.Application.compileJavaFiles(Application.java:803)
at com.google.appengine.tools.admin.Application.compileJsps(Application.java:760)
at com.google.appengine.tools.admin.Application.createStagingDirectory(Application.java:592)
at com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:370)
at com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:53)
at com.google.appengine.tools.admin.AppCfg$UpdateAction.execute(AppCfg.java:1163)
at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:232)
at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:109)
at com.google.appengine.tools.admin.AppCfg.main(AppCfg.java:105)

I googled a lot and applied every possible solution I found. I made sure Eclipse is using the JDK and not JRE. I even tried puting the tools.jar from the jdk into the lib/shared of AppEngineSDK. Nothing worked, so I decided to try another approach - I used the Guestbook demo as a start point. The Guestbook demo deployed perfectly when unmodified. But then I modified it. I move the code below from guestbook.jsp in separate .jsp file (includement.jsp). And then I use <%@ include file="/includement.jsp" %> in guestbook.jsp. And this is it. It works perfectly on my local computer. But it won't deploy giving me the error shown above.

Here is the code I moved:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="java.util.List" %>
<%@ page import="com.google.appengine.api.users.User" %>
<%@ page import="com.google.appengine.api.users.UserService" %>
<%@ page import="com.google.appengine.api.users.UserServiceFactory" %>
<%@ page import="com.google.appengine.api.datastore.DatastoreServiceFactory" %>
<%@ page import="com.google.appengine.api.datastore.DatastoreService" %>
<%@ page import="com.google.appengine.api.datastore.Query" %>
<%@ page import="com.google.appengine.api.datastore.Entity" %>
<%@ page import="com.google.appengine.api.datastore.FetchOptions" %>
<%@ page import="com.google.appengine.api.datastore.Key" %>
<%@ page import="com.google.appengine.api.datastore.KeyFactory" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

<%
String guestbookName = request.getParameter("guestbookName");
if (guestbookName == null) {
    guestbookName = "default";
}
pageContext.setAttribute("guestbookName", guestbookName);
UserService userService = UserServiceFactory.getUserService();
User user = userService.getCurrentUser();
if (user != null) {
  pageContext.setAttribute("user", user);
%>

I have been struggling for a week now and I am pretty much desperate. It just doesn't make any sense to me that it works locally and won't get deployed.

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http://stackoverflow.com/questions/15309621/google-app-engine-wont-deploy-when-using-include-file-file-jsp