3

在过去的几个小时里，我一直在为这个问题头疼。这是我第一次尝试编写 Web 应用程序并将其部署到 apache tomcat Web 容器。我从这里开始遵循一个简单的教程，然后最终得到这个错误。尝试了其他帖子中出现的关于同一问题的一些解决方案，但到目前为止似乎都没有奏效。我分别粘贴 web.xml、website.xml 和我的代码文件的片段。请看看我是否做错了什么。提前致谢。

网页.xml：

<?xml version="1.0"?>
<web-app
     xmlns="http://java.sun.com/xml/ns/j2ee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
        http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
     version="2.4">
   <servlet>
      <servlet-name>home</servlet-name>
      <servlet-class>website.web.TestServlet</servlet-class>
   </servlet>
   <servlet-mapping>
      <servlet-name>home</servlet-name>
      <url-pattern>/home</url-pattern>
   </servlet-mapping>
</web-app>

网站.xml：

<Context path="/website" docBase="C:\Users\Priyankar\workspace\website\web" />

HomeServlet.java

package website.web;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HomeServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) 
               throws ServletException, IOException {
                  PrintWriter writer = resp.getWriter();
                  writer.println("<h1>Hello, World!</h1>");
               }        
}

以下是我在localhost_access_log中看到的内容：

0:0:0:0:0:0:0:1 - admin [21/Jun/2013:13:25:40 -0500] "POST /manager/html/deploy?org.apache.catalina.filters.CSRF_NONCE=435C56002971030D163AA1C798F91722 HTTP/1.1" 200 14076
0:0:0:0:0:0:0:1 - - [21/Jun/2013:13:28:50 -0500] "GET /website/home HTTP/1.1" 405 1065

经理日志：

Jun 21, 2013 1:25:40 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: init: Associated with Deployer 'Catalina:type=Deployer,host=localhost'
Jun 21, 2013 1:25:40 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: init: Global resources are available
Jun 21, 2013 1:25:40 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: install: Installing context configuration at 'C:\Users\Priyankar\workspace\website\website.xml'
Jun 21, 2013 1:25:40 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: list: Listing contexts for virtual host 'localhost'

其余的对我来说似乎很正常，除非您想查看任何特定的日志文件。

错误信息：

HTTP Status 500 - Error instantiating servlet class website.web.TestServlet

type Exception report

message Error instantiating servlet class website.web.TestServlet

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Error instantiating servlet class website.web.TestServlet
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    java.lang.Thread.run(Unknown Source)

root cause

java.lang.ClassNotFoundException: website.web.TestServlet
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    java.lang.Thread.run(Unknown Source)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.41 logs.
Apache Tomcat/7.0.41

这是包资源管理器中项目树的屏幕截图：

在此处输入图像描述

4

2 回答 2

2

您的屏幕截图中的代码用于一个名为的 Java 类，website.web.TestServlet但您web.xml发布的代码说website.web.HomeServlet.

于 2013-06-21T22:27:31.933 回答
2

您提供的类名是 TestServlet，而您的 web.xml 是 HomeServlet。因此，当您点击 URL 时，它找不到任何称为 HomeServlet 的内容。

稍微偏离主题但相关：如果您有

<load-on-startup>0</load-on-startup>

标签。

这基本上在部署期间加载了 Servlet，如果它没有找到任何它会抛出。如果您不提供该标签，则服务器会在需要时加载。

于 2013-06-21T22:53:11.370 回答