Eclipse、tomcat、404错误
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Eclipse, tomcat, 404 error
提问by bancer
I am learning servlets and follow thistutorial (I follow step by step but I named the project "SampleServlet" instead of "de.vogella.wtp.filecounter"). When I start the server (step 5.4) I get 404 page error:
我正在学习 servlets 并遵循本教程（我一步一步地遵循，但我将项目命名为“SampleServlet”而不是“de.vogella.wtp.filecounter”）。当我启动服务器（步骤 5.4）时，我收到 404 页面错误：
HTTP Status 404 - /SampleServlet/servlet/de.vogella.wtp.filecounter.servlets.FileCounter
type Status report
message /SampleServlet/servlet/de.vogella.wtp.filecounter.servlets.FileCounter
description The requested resource (/SampleServlet/servlet/de.vogella.wtp.filecounter.servlets.FileCounter) is not available.
Where to start debugging? There were several "INFO" in the console when server started and one warning:
从哪里开始调试？服务器启动时控制台中有几个“INFO”和一个警告：
29.08.2011 21:03:44 org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:SampleServlet' did not find a matching property.
Do I need to change any preferences?
我需要更改任何偏好吗？
回答by BalusC
The tutorial is suggesting you to invoke it by http://localhost:8080/de.vogella.wtp.filecounter/FileCounter. The project name defaults to context name de.vogella.wtp.filecounterwhich you've changed to SampleServlet, so you need to invoke the servlet by http://localhost:8080/SampleServlet/FileCounter.
本教程建议您通过http://localhost:8080/de.vogella.wtp.filecounter/FileCounter调用它。项目名称默认为de.vogella.wtp.filecounter您已更改为的上下文名称SampleServlet，因此您需要通过http://localhost:8080/SampleServlet/FileCounter调用 servlet 。
See also:
也可以看看：
As to the SetPropertiesRulewarning, just ignore it, that's normal. Eclipse is just adding an extra attribute to Tomcat's <Context>element to be able to associate the deployed webapp with a particular project. Tomcat is just jerking because it don't recognize it as one of the predefined <Context>attributes. It's however trying to be helpful for the case the enduser actually made a typo and so on. Just ignore it. You won't see it when you export the webapp and deploy it on a real production server.
至于SetPropertiesRule警告，忽略它，这是正常的。Eclipse 只是向 Tomcat 的<Context>元素添加了一个额外的属性，以便能够将部署的 web 应用程序与特定项目相关联。Tomcat 只是在抽搐，因为它没有将其识别为预定义的<Context>属性之一。然而，它试图对最终用户实际打错字等情况有所帮助。忽略它。当您导出 webapp 并将其部署在真实的生产服务器上时，您将看不到它。
回答by Chris
Okay according to your web.xml it seems like you're missing a servlet definition and a servlet-mapping. I Don't know why this is not generated by your ide. It should be something like this:
好的，根据您的 web.xml，您似乎缺少 servlet 定义和 servlet 映射。我不知道为什么这不是由您的 ide 生成的。它应该是这样的：
<servlet>
<servlet-name>SampleServlet</servlet-name>
<servlet-class>your.package.SampleServlet</servlet-class> <!-- The full qualified package path to your Servlet class -->
</servlet>
<servlet-mapping>
<servlet-name>SampleServlet</servlet-name>
<url-pattern>/mysample</url-pattern>
</servlet-mapping>
In the servlet-mappingElement you just map any url to your servlet defined above. So if you now call http://yourserver:8080/projectname/mysamplethe Servlet your.package.SampleServlet will be called.
在servlet-mappingElement 中，您只需将任何 url 映射到上面定义的 servlet。因此，如果您现在调用http://yourserver:8080/projectname/mysampleServlet your.package.SampleServlet 将被调用。
I hope that helps.
我希望这有帮助。
回答by vovantam
Add FileCounter as one of a welcome-file in web.xml, it's look like below.
将 FileCounter 添加为 web.xml 中的欢迎文件之一，如下所示。
<?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" id="WebApp_ID" version="2.5">
<display-name>de.vogella.wtp.filecounter</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
<!-- <welcome-file>FirstJSP.jsp</welcome-file> -->
<welcome-file>FileCounter</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<display-name>FileCounter</display-name>
<servlet-name>FileCounter</servlet-name>
<servlet-class>de.vogella.wtp.filecounter.servlets.FileCounter</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FileCounter</servlet-name>
<url-pattern>/FileCounter</url-pattern>
</servlet-mapping>
</web-app>
