Jogo dos 6 erros... qual eh o meu problema

import java.sql.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class JDBCExemplo extends HttpServlet {
	public JDBCExemplo() {
	    }

	public void doPost(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException {
	        throw new ServletException("Não implementado");
	    }

	public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException {

        DriverManager.registerDriver (new oracle.jdbc.driver.OracleDriver());

		Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@999.999.999.9:1521:orcl", "user", "passwd");

		// Query the employee names
		Statement stmt = conn.createStatement ();
        ResultSet rset = stmt.executeQuery ("select nome from algo_tst");

        // Print the name out
		while (rset.next())
		      System.out.println (rset.getString (1));

	    }
}