我正在学习Servlets概念。最初，ITutorial引用了此链接并研究HelloWorld示例。

在提交带有名称和年龄的JSP表单时，出现以下错误。请就必须做什么提供建议。

我放置的文件的位置如下，

C：\ Program Files \ Apache Software Foundation \ Tomcat 5.5 \ webapps \
servletexmple \ hello.jsp

C：\ Program Files \ Apache Software Foundation \ Tomcat5.5 \ webapps \
servletexmple \ example \ HelloServlet.class

C：\ Program Files \ Apache Software Foundation \ Tomcat 5.5 \ webapps \
servletexmple \ WEB-INF \ web.xml

Exception:

javax.servlet.ServletException: Wrapper cannot find servlet class example.HelloServlet or a class it depends on
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
java.lang.Thread.run(Unknown Source)

Root Cause:
java.lang.ClassNotFoundException: example.HelloServlet
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1359)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1205)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
java.lang.Thread.run(Unknown Source)

我的web.xml文件包含以下内容，

<?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">

<servlet>
    <servlet-name>HelloServlet</servlet-name>
    <servlet-class>example.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>HelloServlet</servlet-name>
    <url-pattern>/servletexmple</url-pattern>
</servlet-mapping>
</web-app>