servlet处理表单出现问题

[boilin]

各位:最近才学servlet我写了一个处理表单数据的类FormServlet 能通过编译:放在默认的
%tomcat&\webapps\ROOT\WEB-INF\classes 下 也在web.xml 下注册了
<servlet>
<servlet-name>FormServlet</servlet-name>
<servlet-class>FormServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>FormServlet</servlet-name>
<url-pattern> / servlet/FormServlet</url-pattern>
</servlet-mapping>

可是我通过 http://localhost/servlet/FormServlet 访问出现问题具体情况如下:
到底是怎么回事?能否指点一下!

HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

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

exception

javax.servlet.ServletException: Class FormServlet is not a Servlet
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
java.lang.Thread.run(Thread.java:595)


root cause

java.lang.ClassCastException: FormServlet
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
java.lang.Thread.run(Thread.java:595)

[Squall1009]

FormServlet 没有继承 HttpServlet

[leomengwei]

应该是映射的虚拟路径的问题吧
<url-pattern> /FormServlet </url-pattern>

[wuxo84]

<url-pattern> / servlet/FormServlet </url-pattern>
你这里面的路径有不必要的空格

还有 把你的代码贴出来，是不是你没按servlet的要求写servlet类？