Having problems getting Email to work while following Google App Engine Tutorial for Java

I've been working my way through a Google App Engine 教程。

I entered the code shown in section 6 and then tried to test the functionality as instructed.

However, regardless of what email address I put in the form's To: field, I get an error that looks like this:

Message send failure
HTTP ERROR 404
Problem accessing /_ah/mail/[email protected]. Reason:
    NOT_FOUND
Powered by Jetty://

Event though the test was apparently failing, I deployed the application to appspot.com

Here, I could not even access /_ah/mail/, so I sent an e-mail from Outlook. The application didn't receive it and the following bounced back:

Delivery to the following recipient failed permanently:

     [email protected]

----- Original message -----

Received: by 10.204.82.130 with SMTP id b2mr13438bkl.0.1285692691837;
        Tue, 28 Sep 2010 09:51:31 -0700 (PDT)
Return-Path: <[email protected]>
Received: from mail-bw0-f46.google.com (mail-bw0-f46.google.com
[209.85.214.46])
        by gmr-mx.google.com with ESMTP id z25si3874412bku.
5.2010.09.28.09.51.30;
        Tue, 28 Sep 2010 09:51:30 -0700 (PDT)
Received-SPF: pass (google.com: domain of [email protected] designates 209.85.214.46 as permitted sender) client-ip=209.85.214.46;
Authentication-Results: gmr-mx.google.com; spf=pass (google.com:
domain of [email protected] designates 209.85.214.46 as permitted
sender) [email protected]; dkim=pass (test mode) [email protected]
Received: by bwz11 with SMTP id 11so5254251bwz.5
        for <[email protected]>;
Tue, 28 Sep 2010 09:51:30 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=gamma;
        h=domainkey-signature:received:received:reply-
to:from:to:subject:date
         :organization:message-id:mime-version:content-type
         :content-transfer-encoding:x-mailer:thread-index:x-mimeole;
        bh=5hMmQ/fy4AdMWGj7dA7tHInFNumFfhg24xHggsIZKR4=;
        b=OitMOXiZONheUMpkDU8mVUdWhk2AhUAuBbnSnyqDs1WWOPx0Ao75bWHBZZ/
lhRtOO+
         yMvLhDvrN+/cTDnxuQI6ICBb1KZh9eeExMrgdaQGV+/
pnaBK3PAEotfL8QgX81V1AKFE
         j58cbhxWUH0JSTVckXucribInLNCNJnIqvyD0=
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=reply-to:from:to:subject:date:organization:message-id:mime-
version
         :content-type:content-transfer-encoding:x-mailer:thread-index
         :x-mimeole;

b=Adh4j5+8xWF7MKIT6YTBE8PXH2iQG4yi2hulXgQ0QL5ZB1qmTNJiu5U2MlwWzJF7zQ
         DR1uBnwVNu0WtZxzHbneVsZY
+aSH8sPrmgPFTZSHTGcCU0+SXW9UjyZndVJdFhPP2Nfc
         GBeolrTikuhBtU+1F9T23io6wJqEwLg7X6HnU=
Received: by 10.204.58.75 with SMTP id f11mr192120bkh.
138.1285692690387;
        Tue, 28 Sep 2010 09:51:30 -0700 (PDT)
Return-Path: <[email protected]>
Received: from blackbox (catv-86-101-152-197.catv.broadband.hu
[86.101.152.197])
        by mx.google.com with ESMTPS id 11sm5779682bkj.
23.2010.09.28.09.51.27
        (version=TLSv1/SSLv3 cipher=RC4-MD5);
        Tue, 28 Sep 2010 09:51:29 -0700 (PDT)
Reply-To: <[email protected]>
From: "Brian Kessler" <[email protected]>
To: <[email protected]>
Subject: Go south
Date: Tue, 28 Sep 2010 18:52:12 +0200
Organization: Flux Szerviz BT.
Message-ID: <A878B05D923A4EDEBC8015D3B5448D2F@blackbox>
MIME-Version: 1.0
Content-Type: text/plain;
    charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Mailer: Microsoft Office Outlook 11
thread-index: ActfLX7QaTtIrEoETYWtToubxBHBOw==
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5994

Way down south to mexico

--
Brian Kessler
[email protected]
+36 30 637 1824

Following a suggestion below, I modified the tutorial's

<servlet-mapping>
    <servlet-name>Email</servlet-name>
    <url-pattern>/_ah/mail/*</url-pattern>
</servlet-mapping>

读书：

<servlet-mapping>
    <servlet-name>Email</servlet-name>
    <url-pattern>/_ah/mail/.+</url-pattern>
</servlet-mapping>

which drastically changed the error when I tried to submit an email on the local server to:

Message send failure
HTTP ERROR 500
Problem accessing /_ah/mail/[email protected]. Reason:
    de/vogella/gae/java/todo/dao/Dao
Caused by:
java.lang.NoClassDefFoundError: de/vogella/gae/java/todo/dao/Dao
    at de.vogella.gae.java.todo.EmailServlet.doPost(EmailServlet.java:43)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:58)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:349)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: java.lang.ClassNotFoundException: de.vogella.gae.java.todo.dao.Dao
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:151)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
    ... 28 more
Caused by:
java.lang.ClassNotFoundException: de.vogella.gae.java.todo.dao.Dao
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:151)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
    at de.vogella.gae.java.todo.EmailServlet.doPost(EmailServlet.java:43)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:58)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:349)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
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However, as per the tutorial, de.vogella.gae.java.todo.dao.Dao exists as an enum instead of a class. I tried to change this to a class, but eclipse immediately started to complain

Syntax Error on token "INSTANCE".  VariableDeclarator expected after this token.

Is the original tutorial doing so much wrong?我该如何解决它？

看答案

Your web.xml needs an entry that matches /_ah/mail/*, with a mapping to a servlet that handles those addresses.

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