Import, package, connection

Question

Here's my problem. This a second forum, first one; no answer.
I think here are all the necessary information, codes are quite long...
I have 3 servlets, S1, S2, S3. and a java class Data.
All these servlets, classes and build.xml are in a same folder ( WEB-INF/src/
Compiler says that S1 and S2 are ok, but S3; there are 4 errors.
And when I try ( S2 works fine ) to open url S3 a web browser says;
The requested resource.... is not available.
S1
import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public abstract class S1 extends HttpServlet {
public void doGet(HttpServletRequest req,
HttpServletResponse resp)
throws IOException, ServletException
Connection db = null;
and so on...
protected abstract void execute(HttpServletRequest req,
PrintWriter out,
Connection db) throws Exception;
S2
import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class S2 extends S1 {
public void execute(HttpServletRequest req,
PrintWriter out,
Connection db) throws Exception
Connection con = null;
and so on...
S3
// I believe the problem is JUST in S3. I think that S1 and S2 are ok.
import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class S3 extends S1 {        // THIS  MUST EXTEND S1
public void execute(HttpServletRequest req, PrintWriter out, Connection db) throws Exception {}
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {}
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
and so on...
Compiler says 4 errors;
S3.java:15: cannot find symbol
[javac] symbol: class S1
[javac] public class S3 extends S1 {
[javac] ^
S3.java:64: cannot find symbol
[javac] symbol : variable db
[javac] location: class S2.S3
[javac] db = Data.getConnection();
[javac] ^
S3.java:64: cannot find symbol
[javac] symbol : variable Data
[javac] location: class S2.S3
[javac] db = Data.getConnection();
^
S3.java:65: cannot find symbol
[javac] symbol : variable db
[javac] location: class S2.S3
[javac] Statement stmt6 = db.createStatement();
[javac] ^
[javac] 4 errors
And I have a class Data and method getConnection is in it;
import java.sql.*;
public class Data {
public static Connection getConnection() throws Exception {
Please, help. Can someone solve this? Why S3 can't find S1 and its symbols??

Answer 1

Please use 'New to Java' forum for compilation errors. This is unrelated to servlets.