Getting ClassNotFoundException error.

I am working in eclipse and using Jboss-server4.2. Even after adding external mysql-connector jar in build path I am getting the error classnotfoundexception. Even I have tried to place mysql-connector jar inside /web-inf/lib folder.
My-Code looks like

Code :

---

public class Auth extends HttpServlet {
	private static final long serialVersionUID = 1L;
 
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
 
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.setContentType("text/HTML");
		PrintWriter out = response.getWriter();
		String uname = request.getParameter("uname");
		String pass = request.getParameter("pass") ;
		try{
			Class.forName("com.mysql.jdbc.Driver");
			   out.println("Driver Loaded");
 
			Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/j2ee","root","root");
				out.println("Connction Established");
 
			PreparedStatement pr = con.prepareStatement("insert into user values(?,?)");
			 pr.setString(1, uname);
			 pr.setString(2, pass);
			 int x = pr.executeUpdate();
			 if(x>0)
			 {
				 out.println("Success");
				 out.println(uname + " thanks!!");
				 out.println("Your password: "+ pass);
			 }
			 else
				 out.println("Failed");
 
 
		}
		catch(SQLException e){
			out.println(e);
		}
		catch(ClassNotFoundException f){
			out.println(f);
		}
 
 
	}
 
}

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Also at java-forums.org

Read the docs for the JBoss server you are using - you need to place external libraries in the appropriate location for them to be on the classpath (not sure about this version, but in other versions its the server/default/lib/ directory)