Can't get servlets to run on tomcat

i have the proper entries in the web.xml and server.xml, so thats definately not the problem. however, when i do run my servlet, i get this error message:
Error: 500
Location: /meetthestudent/servlet/helloworld
Internal Servlet Error:
java.lang.NullPointerException
 at java.lang.ClassLoader.resolveClass0(Native Method)
 at java.lang.ClassLoader.resolveClass(ClassLoader.java:545)
 at org.apache.tomcat.loader.AdaptiveClassLoader.loadClass(AdaptiveClassLoader.java, Compiled Code)
 at org.apache.tomcat.loader.AdaptiveServletLoader.loadClass(AdaptiveServletLoader.java:174)
 at org.apache.tomcat.core.ServletWrapper.loadServlet(ServletWrapper.java:265)
 at org.apache.tomcat.core.ServletWrapper.init(ServletWrapper.java:289)
 at org.apache.tomcat.core.Handler.service(Handler.java:254)
 at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
 at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:812)
 at org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)
 at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
 at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java, Compiled Code)
 at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java, Compiled Code)
 at java.lang.Thread.run(Thread.java:479)
the code of the servlet is as follows:
package helloworld;
* Title: 
* Description: 
* Copyright: Copyright (c) 2003
* Company: 
* @author not attributable
* @version 1.0
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import java.io.IOException;
import java.io.PrintWriter;
public class HelloWorld extends HttpServlet {
protected void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>\n\t<body>\n\t\t<basefont face=\"verdana\">\n\t\tHello World!\n\t</body>\n</html>");
out.close();
what's the problem? thanx for any help, i would immensely appreciate it!
-Tom

Try to change your doPost to doGet...
And anyway, what is the version of your Tomcat?
The new code:
package helloworld;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import java.io.IOException;
import java.io.PrintWriter;
public class HelloWorld extends HttpServlet {
protected void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>\n\t<body>\n\t\t<basefont face=\"verdana\">\n\t\tHello World!\n\t</body>\n</html>");
out.close();

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