实例化servlet类com.XYZClass时出错

Question

当我尝试在我的eclipse霓虹灯中加载servlet时，它给了我＆＃34;错误实例化servlet类com.Test＆＃34;错误说明＆＃34;服务器遇到内部错误，导致无法完成此请求。＆＃34;我可以成功加载.jsp页面，但在尝试加载servlet页面时，它会让我在eclipse borwser中出现以下错误。

和控制台生成以下错误。

＆＃13;

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Sep 07, 2016 9:03:01 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Demo' did not find a matching property.
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server version:        Apache Tomcat/7.0.70
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server built:          Jun 15 2016 16:27:45 UTC
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server number:         7.0.70.0
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Name:               Windows 7
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Version:            6.1
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Architecture:          amd64
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Java Home:             C:\Program Files\Java\jre1.8.0_101
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Version:           1.8.0_101-b13
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Vendor:            Oracle Corporation
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_BASE:         D:\darshana\eWorkspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp2
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_HOME:         C:\Program Files\Apache Software Foundation\Tomcat 7.0
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.base=D:\darshana\eWorkspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp2
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.home=C:\Program Files\Apache Software Foundation\Tomcat 7.0
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dwtp.deploy=D:\darshana\eWorkspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp2\wtpwebapps
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Djava.endorsed.dirs=C:\Program Files\Apache Software Foundation\Tomcat 7.0\endorsed
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dfile.encoding=Cp1252
Sep 07, 2016 9:03:01 AM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre1.8.0_101\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jre1.8.0_101/bin/server;C:/Program Files/Java/jre1.8.0_101/bin;C:/Program Files/Java/jre1.8.0_101/lib/amd64;C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\PuTTY\;C:\Program Files\TortoiseSVN\bin;C:\Program Files (x86)\Skype\Phone\;C:\Program Files\nodejs\;C:\Program Files\MongoDB\Server\3.2\bin;C:\Users\darshana.ahalpara\AppData\Roaming\npm;C:\Program Files\MongoDB\Server\3.2\bin;C:\Program Files\Java\jdk1.8.0_101\bin;;C:\Users\darshana.ahalpara\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Eclipse;;.
Sep 07, 2016 9:03:01 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8085"]
Sep 07, 2016 9:03:01 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Sep 07, 2016 9:03:01 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 731 ms
Sep 07, 2016 9:03:02 AM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Sep 07, 2016 9:03:02 AM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.70
Sep 07, 2016 9:03:02 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8085"]
Sep 07, 2016 9:03:02 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Sep 07, 2016 9:03:02 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 954 ms
Sep 07, 2016 9:03:27 AM org.apache.catalina.core.ApplicationContext log
INFO: Marking servlet Demo as unavailable
Sep 07, 2016 9:03:27 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Allocate exception for servlet Demo
java.lang.ClassNotFoundException: com.Test
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1891)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1734)
	at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:504)
	at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:486)
	at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:113)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1146)
	at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:866)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:134)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Unknown Source)

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以下是我的目录结构。

这是我的Test.java

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package com.abc;

import java.io.IOException;
import javax.servlet.ServletException;
//import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Test
 */
//@WebServlet("/Test")
public class Test extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Test() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Hello....!!!!!! ");//.append(request.getContextPath());
	}

}

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这是web.xml

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<?xml version="1.0" encoding="UTF-8"?>
<web-app
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    version="3.0">
  <servlet>
    <servlet-name>Demo</servlet-name>
    <servlet-class>com.abc.Test</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Demo</servlet-name>
    <url-pattern>/demo</url-pattern>
  </servlet-mapping>
  <servlet>
    <servlet-name>example</servlet-name>
    <jsp-file>/exmpl.jsp</jsp-file>
  </servlet>
  <servlet-mapping>
    <servlet-name>example</servlet-name>
    <url-pattern>/example</url-pattern>
  </servlet-mapping>
</web-app>

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