import java.sql.*;
import java.util.*;
import javax.naming.*;

public class Controller {               

     public static String processUser(String sqlStmt, String whichSvlt){

      String st ="";
      String first_name = null;
      String last_name;
      String ssn;
      String email;
      String address;
      String userid;
      String password; 

      List<StudentInfo> result = new ArrayList<StudentInfo>();
        // later I will use whichSvlt to guide the result to desired output point
        Context ctx = null;
        Hashtable ht = new Hashtable();
        ht.put(Context.PROVIDER_URL, "t3://localhost:7001");
          Connection conn = null;
          Statement stmt = null;
          ResultSet rs = null;
          try {
            ctx = new InitialContext(ht);
            javax.sql.DataSource ds = (javax.sql.DataSource) ctx.lookup ("DataBase");
            conn = ds.getConnection();
            stmt = conn.createStatement();
            //  takes SQL statements from Login and Register servlets:          
                        rs =stmt.executeQuery(sqlStmt);

                        // Reads data objects in database Going Forward
                        while ( {
                            //for (int i = 1; i <= meta.getColumnCount(); i++) {
                            st = rs.getObject(1) + " " +rs.getObject(2); 

                            //String name = rs.getString("fname");
                            first_name  = rs.getObject(1).toString();
                            last_name   = rs.getObject(2).toString();
                            ssn         = rs.getObject(3).toString();
                            email       = rs.getObject(4).toString();
                            address     = rs.getObject(5).toString();
                            userid      = rs.getObject(6).toString();
                            password    = rs.getObject(7).toString();

                        // tried below but didn't work so commented out
                        //  StudentInfo student = new StudentInfo(); // Creating a Student object to fill with Student data
                        //  student.setstdFn(first_name);
                        //  student.setstdLn(last_name);
                        //  student.setstdSsn(ssn);
                        //  student.setstdEml(email);
                        //  student.setstdAdd(address);
                        //  student.setstdUId(userid);
                        //  student.setstdpwd(password);

                            //Add the retrived Student to the list
                            System.out.println(st); // this works without the object and I can see the result in sys_out


            //Close JDBC objects as soon as possible
            //default title and icon

      }catch(Exception e) {e.printStackTrace();}

        finally {    
          try { 
          } catch (Exception e) {System.out.println(e);}
          try { 
            if (rs != null) rs.close(); 
          } catch (Exception e) {System.out.println(e);}
          try { 
            if (stmt != null) stmt.close(); 
          } catch (Exception e) {System.out.println(e);}
          try { 
            if (conn != null) conn.close(); 
          } catch (Exception e) {System.out.println(e);}

        return st; // this is the value I want to retrieve with another servlet
        // I can print it in my terminal window but always show up as null in the other servlet



I see the return value, but nowhere do I see where you define the other servelet and from that call controller::processUser.

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