gracias por tu contestacion pero me sigue sin ir te voy a poner el codigo a ver si encuentras algo k no veo yo :
 la clase ShowParameters.java 
package org.stevengould.show; 
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;  
/** Shows all the parameters sent to the servlet via either
 *  GET or POST. Specially marks parameters that have no values or
 *  multiple values.
 *  
 *  Part of tutorial on servlets and JSP that appears at
 *  
http://www.apl.jhu.edu/~hall/java/Servlet-Tutorial/
 *  1999 Marty Hall; may be freely used or adapted.
 */ 
public class ShowParameters extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    String title = "Reading All Request Parameters";
    out.println(
                "<BODY BGCOLOR=\"#FDF5E6\">\n" +
                "<H1 ALIGN=CENTER>" + title + "</H1>\n" +
                "<TABLE BORDER=1 ALIGN=CENTER>\n" +
                "<TR BGCOLOR=\"#FFAD00\">\n" +
                "<TH>Parameter Name<TH>Parameter Value(s)");
    Enumeration paramNames = request.getParameterNames();
    while(paramNames.hasMoreElements()) {
      String paramName = (String)paramNames.nextElement();
      out.println("<TR><TD>" + paramName + "\n<TD>");
      String[] paramValues = request.getParameterValues(paramName);
      if (paramValues.length == 1) {
        String paramValue = paramValues[0];
        if (paramValue.length() == 0)
          out.print("<I>No Value</I>");
        else
          out.print(paramValue);
      } else {
        out.println("<UL>");
        for(int i=0; i<paramValues.length; i++) {
          out.println("<LI>" + paramValues[i]);
        }
        out.println("</UL>");
      }
    }
    out.println("</TABLE>\n</BODY></HTML>");
  } 
  public void doPost(HttpServletRequest request,
                     HttpServletResponse response)
      throws ServletException, IOException {
    doGet(request, response);
  }
}  
Aqui el PostForm.html:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
  <TITLE>A Sample FORM using POST</TITLE>
</HEAD> 
<BODY BGCOLOR="#FDF5E6">
<H1 ALIGN="CENTER">A Sample FORM using POST</H1> 
<FORM ACTION="/SampleForm" METHOD="POST">
  Item Number:
  <INPUT TYPE="TEXT" NAME="itemNum" size="20"><BR>
  Quantity:
  <INPUT TYPE="TEXT" NAME="quantity" size="20"><BR>
  Price Each:
  <INPUT TYPE="TEXT" NAME="price" VALUE="$" size="20"><BR>
  <HR>
  First Name:
  <INPUT TYPE="TEXT" NAME="firstName" size="20"><BR>
  Last Name:
  <INPUT TYPE="TEXT" NAME="lastName" size="20"><BR>
  Middle Initial:
  <INPUT TYPE="TEXT" NAME="initial" size="20"><BR>
  Shipping Address:
  <TEXTAREA NAME="address" ROWS=3 COLS=40></TEXTAREA><BR>
  Credit Card:<BR>
  <INPUT TYPE="RADIO" NAME="cardType" VALUE="Visa">Visa<BR>
  <INPUT TYPE="RADIO" NAME="cardType" VALUE="Master Card">Master Card<BR>
  <INPUT TYPE="RADIO" NAME="cardType" VALUE="Amex">American Express<BR>
  <INPUT TYPE="RADIO" NAME="cardType" VALUE="Discover">Discover<BR>
  <INPUT TYPE="RADIO" NAME="cardType" VALUE="Java SmartCard">Java SmartCard<BR>
  Credit Card Number:
  <INPUT TYPE="PASSWORD" NAME="cardNum" size="20"><BR>
  Repeat Credit Card Number:
  <INPUT TYPE="PASSWORD" NAME="cardNum" size="20"><BR><BR>
  <CENTER>
    <INPUT TYPE="SUBMIT" VALUE="Submit Order">
  </CENTER>
</FORM> 
</BODY>
</HTML>  
y por ultimo el web.xml 
<servlet>
  <servlet-name>org.stevengould.Show.ShowParameters</servlet-name>
  <servlet-class>org.stevengould.Show.ShowParameters</servlet-class>
  </servlet> 
<servlet-mapping>
      <servlet-name>org.stevengould.Show.ShowParameters</servlet-name>
      <url-pattern>/SampleForm</url-pattern>
     </servlet-mapping>
decir que cuando pongo 
http://127.0.0.1:8080/SampleForm en el navegador 
me sale un error HTTP 500 que es todo esto : 
type Informe de Excepción 
mensaje  
descripción El servidor encontró un error interno () que hizo que no pudiera rellenar este requerimiento. 
excepción  
javax.servlet.ServletException: Error reservando espacio para una instancia de servlet
	org.apache.catalina.valves.ErrorReportValve.invoke  (ErrorReportValve.java:118)
	org.apache.coyote.tomcat5.CoyoteAdapter.service(Co  yoteAdapter.java:160)
	org.apache.coyote.http11.Http11Processor.process(H  ttp11Processor.java:799)
	org.apache.coyote.http11.Http11Protocol$Http11Conn  ectionHandler.processConnection(Http11Protocol.jav  a:705)
	org.apache.tomcat.util.net.TcpWorkerThread.runIt(P  oolTcpEndpoint.java:577)
	org.apache.tomcat.util.threads.ThreadPool$ControlR  unnable.run(ThreadPool.java:683)
	java.lang.Thread.run(Thread.java:595)  
causa raíz  
java.lang.NoClassDefFoundError: org/stevengould/Show/ShowParameters (wrong name: org/stevengould/show/ShowParameters)
	java.lang.ClassLoader.defineClass1(Native Method)
	java.lang.ClassLoader.defineClass(ClassLoader.java  :620)
	java.security.SecureClassLoader.defineClass(Secure  ClassLoader.java:124)
	org.apache.catalina.loader.WebappClassLoader.findC  lassInternal(WebappClassLoader.java:1634)
	org.apache.catalina.loader.WebappClassLoader.findC  lass(WebappClassLoader.java:860)
	org.apache.catalina.loader.WebappClassLoader.loadC  lass(WebappClassLoader.java:1307)
	org.apache.catalina.loader.WebappClassLoader.loadC  lass(WebappClassLoader.java:1189)
	org.apache.catalina.valves.ErrorReportValve.invoke  (ErrorReportValve.java:118)
	org.apache.coyote.tomcat5.CoyoteAdapter.service(Co  yoteAdapter.java:160)
	org.apache.coyote.http11.Http11Processor.process(H  ttp11Processor.java:799)
	org.apache.coyote.http11.Http11Protocol$Http11Conn  ectionHandler.processConnection(Http11Protocol.jav  a:705)
	org.apache.tomcat.util.net.TcpWorkerThread.runIt(P  oolTcpEndpoint.java:577)
	org.apache.tomcat.util.threads.ThreadPool$ControlR  unnable.run(ThreadPool.java:683)
	java.lang.Thread.run(Thread.java:595)  
nota La traza completa de la causa de este error se encuentra en los archivos de diario de Apache Tomcat/5.0.28. 
ya se que hay mucha letra pero supongo k asi sera mas facil de resolver
gracias