cant compile servlets

[warriorKnight]

i am currently using java SE 6 and i am not able to compile programs using servlets

i am trying to compile program

import java.io.*; 
import javax.servlet.*; 
public class HelloServlet extends GenericServlet { 
  public void service(ServletRequest request,  
    ServletResponse response)  
  throws ServletException, IOException { 
    response.setContentType("text/html"); 
    PrintWriter pw = response.getWriter(); 
    pw.println("<B>Hello!"); 
    pw.close(); 
  } 
}

but it is giving following errors

HelloServlet.java:2: package javax.servlet does not exist
import javax.servlet.*; 
^
HelloServlet.java:4: cannot find symbol
symbol: class GenericServlet
public class HelloServlet extends GenericServlet { 
                                  ^
HelloServlet.java:6: cannot find symbol
symbol  : class ServletRequest
location: class HelloServlet
  public void service(ServletRequest request,  
                      ^
HelloServlet.java:7: cannot find symbol
symbol  : class ServletResponse
location: class HelloServlet
    ServletResponse response)  
    ^
HelloServlet.java:8: cannot find symbol
symbol  : class ServletException
location: class HelloServlet
  throws ServletException, IOException { 
         ^
5 errors

please help

[FON]

You neeed
servlet-api.jar
on your classpath

If you use Tomcat you can find it in path that looks like this:
C:\apache-tomcat-6.0.20\lib