Google App Engine - 错误503_Service不可用 [英] Google App Engine - Error 503_Service Unavailable
问题描述
我已经编码了gae代码：
index.html：
<！DOCTYPE html>
< html>
< head>
< meta charset =utf-8>
< title>表单< / title>
< / head>
< body>
< form action =/ feedbackmethod =post>
<！ - 简单文本字段 - >
< label for =name> Name< / label>
< input type =textname =name/>
< br />
<！ - 电子邮件 - >
< label for =email>电子邮件< / label>
< input type =emailname =email/>
< br />
<！ - Textarea - >
< label for =description>说明< / label>
< textarea name =descriptioncols =50rows =5>在此输入您的评论< / textarea>
< br />
< input type =submitname =submitvalue =发送请求action =/ feedback/>
< / form>
< / body>
< / html>
web.xml
< servlet的>
< servlet-name> FeedbackServlet< / servlet-name>
< servlet-class> at.wunderapps.servlets.FeedbackServlet< / servlet-class>
< / servlet>
< servlet-mapping>
< servlet-name> FeedbackServlet< / servlet-name>
< url-pattern> / feedback< / url-pattern>
< / servlet-mapping>
< welcome-file-list>
< welcome-file> index.html< / welcome-file>
< / welcome-file-list>
servlet：
import java.io.IOException;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@SuppressWarnings（serial）
public class FeedbackServlet extends HttpServlet {
@Override
protected void doPost（HttpServletRequest req，HttpServletResponse resp）
throws ServletException，IOException {
String name = req.getParameter（name）;
String description = req.getParameter（description）;
String email = req.getParameter（email）;
属性props = new Properties（）;
会话session = Session.getDefaultInstance（道具，null）;
String msgBody = name + description + email +：EMAIL;
try {
消息msg = new MimeMessage（session）;
msg.setFrom（new InternetAddress（apps@gmail.com，
Es FUNKTIONIERT !!!））;
msg.addRecipient（Message.RecipientType.TO，new InternetAddress（my.mail@mail.com，你的名字））;
msg.setSubject（Bestellung）;
msg.setText（msgBody）;
Transport.send（msg）;
} catch（Exception e）{
resp.setContentType（text / plain）;
resp.getWriter（）。println（出现问题，请重试。）;
抛出新的RuntimeException（e）;
}
resp.setContentType（text / plain）;
resp.getWriter（）。println（
感谢您的反馈，电子邮件已发送出去。
}
}
当我在做localhost时，我得到：
HTTP错误：503
访问问题。原因：
SERVICE_UNAVAILABLE
，我得到的例外是：
java.lang.ClassNotFoundException：at.wunderapps.servlets
CRITICAL：javax.servlet .ServletContext log：unavailable
javax.servlet.UnavailableException：at.wunderapps.servlets
20.07.2012 13:13:46 com.google.apphosting.utils .jetty.JettyLogger警告WARNUNG：失败FeedbackServlet：java.lang.NullPointerException
20.07.2012 13:13:46 com.google.apphosting.utils.jetty.JettyLogger警告WARNUNG：上下文启动失败
com .google.appengine.tools.development.DevAppEngineWebAppContext @ 495c998a {/，C：\Users\Desktop\mailservice\war}
java.lang.NullPointerException
我猜问题可能是inde.html找不到我的servlet。但为什么，因为web.xml似乎是好的？你可以帮助我吗？
PS：我在Windows 7上运行。
< servlet的类> at.wunderapps.servlets.FeedbackServlet< / servlet的类>
如果这是您的servlet的完全限定名称，那么FeedbackServlet.java文件的第一行应该是
package at.wunderapps.servlets;
而FeedbackServlet.class文件应在
< yourWebAppRootFolder> /WEB-INF/classes/at/wunderapps/servlets/FeedbackServlet.class
或者如果您在IDE中使用Eclipse，那么只需将代码放在
< yourWebAppRootFolder> /src/at/wunderapps/servlets/FeedbackServlet.java
I am coding a simple gae webapp that should send me an email from a form:
I have coded that gae code:
index.html:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>A form</title>
</head>
<body>
<form action="/feedback" method="post">
<!-- Simple text field -->
<label for="name">Name </label>
<input type="text" name="name"/>
<br/>
<!-- Email -->
<label for="email">Email </label>
<input type="email" name="email"/>
<br/>
<!-- Textarea -->
<label for="description">Description </label>
<textarea name="description" cols="50" rows="5">Type your comment here</textarea>
<br/>
<input type="submit" name="submit" value="Send Request" action="/feedback"/>
</form>
</body>
</html>
web.xml
<servlet>
<servlet-name>FeedbackServlet</servlet-name>
<servlet-class>at.wunderapps.servlets.FeedbackServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FeedbackServlet</servlet-name>
<url-pattern>/feedback</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
servlet:
import java.io.IOException;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@SuppressWarnings("serial")
public class FeedbackServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String name = req.getParameter("name");
String description = req.getParameter("description");
String email = req.getParameter("email");
Properties props = new Properties();
Session session = Session.getDefaultInstance(props, null);
String msgBody = name + description + email + " :EMAIL";
try {
Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress("apps@gmail.com",
"Es FUNKTIONIERT!!!"));
msg.addRecipient(Message.RecipientType.TO, new InternetAddress("my.mail@mail.com", "Your name"));
msg.setSubject("Bestellung");
msg.setText(msgBody);
Transport.send(msg);
} catch (Exception e) {
resp.setContentType("text/plain");
resp.getWriter().println("Something went wrong. Please try again.");
throw new RuntimeException(e);
}
resp.setContentType("text/plain");
resp.getWriter().println(
"Thanks you for your feedback. An Email has been send out.");
}
}
When I am doing localhost i get:
HTTP ERROR: 503
Problem accessing /. Reason:
SERVICE_UNAVAILABLE
and the exceptions I get are:
java.lang.ClassNotFoundException: at.wunderapps.servlets
CRITICAL: javax.servlet.ServletContext log: unavailable javax.servlet.UnavailableException: at.wunderapps.servlets
20.07.2012 13:13:46 com.google.apphosting.utils.jetty.JettyLogger warn WARNUNG: failed FeedbackServlet: java.lang.NullPointerException 20.07.2012 13:13:46 com.google.apphosting.utils.jetty.JettyLogger warn WARNUNG: Failed startup of context com.google.appengine.tools.development.DevAppEngineWebAppContext@495c998a{/,C:\Users\Desktop\mailservice\war} java.lang.NullPointerException
I guess the problem could be that the inde.html does not find my servlet. But why, cause the web.xml seems to be alright? Can you please help me?
PS.: I am running it on windows 7.
<servlet-class>at.wunderapps.servlets.FeedbackServlet</servlet-class>
If that is the fully qualified name of your servlet, then the first line of the FeedbackServlet.java file should be
package at.wunderapps.servlets;
and the FeedbackServlet.class file should be at
<yourWebAppRootFolder>/WEB-INF/classes/at/wunderapps/servlets/FeedbackServlet.class
Or if you are using Eclipse for your IDE, then just place your code in
<yourWebAppRootFolder>/src/at/wunderapps/servlets/FeedbackServlet.java
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