配置<url-pattern>不能正常显示servlet,该如何处理

配置<url-pattern>不能正常显示servlet
在web.xml中配置 
<servlet> 
<servlet-name> HelloServlet </servlet-name> 
<servlet-class> HelloServlet </servlet-class> 
</servlet> 
<servlet-mapping> 
<servlet-name> HelloServlet </servlet-name> 
<url-pattern> /Servlet/HelloServlet </url-pattern> 
<servlet-mapping> 
在浏览器中输入http://localhost:8080/store/servlet/HelloServlet 显示404错误
当<url-pattern> /Servlet/HelloServlet </url-pattern> 改成<url-pattern> /HelloServlet </url-pattern> 
就能跳转到请求页面了，怎么回事啊？

------解决方案--------------------
is S = s ?
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http://localhost:8080/store/servlet/HelloServlet
里的servlet写成Servlet
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探讨

http://localhost:8080/store/servlet/HelloServlet
里的servlet写成Servlet

------解决方案--------------------
http://localhost:8080/store/servlet/HelloServlet这个应该是http://localhost:8080/store/Servlet/HelloServlet