Invisible JScrollPane?

Question

I have a JList matched up with a JTextArea. Inside the JList I want it to list numbers corresponding to the line in the JTextArea. I have the JList's and JTextArea's JScrollPanes synched up. But, I only want the JTextArea's JScrollPane to show up. Is it possible to have the JList's JScrollPane be invisible but because it is synched up with the JTextArea's JScrollPane still scroll through the JList? If you do not know what I mean or want more of my code, let me know.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;
public class cfmCodeCounter1_1 extends JFrame
     private JLabel lblEnter;
     private JTextArea input, output;
     private JList row;
     private JButton parse, clear, exit;
     private JScrollPane scroller, scroller2, scroller3;
     private Container c;
     private Vector <String> rowVec;
     private boolean threadflag = false; // Used so only one thread for the CaretListener runs at one time
     private cfmCodeCounter1_1()
          try
               this.setTitle("ColdFusion Parser - NGIT");
               // Vector
               rowVec = new Vector<String>();
               // Display Label
               lblEnter = new JLabel("Enter Code Below: ");
               lblEnter.setVisible(true);
               // JTextAreas
               input = new JTextArea(10, 30); // (rows, columns)
               input.setEditable(true);
               scroller = new JScrollPane(input);
               input.requestFocus();
               output = new JTextArea(5, 19); // (rows, columns)
               output.setEditable(false);
               scroller2 = new JScrollPane(output);
               output.requestFocus();
               // Selectable List
               row = new JList(rowVec);
               row.setVisibleRowCount(10);
               row.setFixedCellWidth(50);
               row.setFixedCellHeight((input.getPreferredSize().height/10));
               scroller3 = new JScrollPane(row);
               // Set up scroller and scroller3
               scroller.getVerticalScrollBar().setModel(scroller3.getVerticalScrollBar().getModel());
               // Set up listener for input and row
               TextHandler txthandle = new TextHandler();
               input.addCaretListener(txthandle);
               // Button
               parse = new JButton("Parse Code");
               clear = new JButton("Clear");
               exit = new JButton("Exit");
               // Set Layout
               c = getContentPane();
               SpringLayout layout = new SpringLayout();
               c.setLayout(layout);
               c.add(lblEnter);
               c.add(scroller3);
               c.add(scroller);
               c.add(scroller2);
               c.add(parse);
               c.add(clear);
               c.add(exit);
               // Place lblEnter
               layout.putConstraint(SpringLayout.WEST, lblEnter,
                             10,
                             SpringLayout.WEST, c);
             layout.putConstraint(SpringLayout.NORTH, lblEnter,
                             10,
                             SpringLayout.NORTH, c);
            // Place scroller3 aka row
               layout.putConstraint(SpringLayout.WEST, scroller3,
                             10,
                             SpringLayout.WEST, c);
             layout.putConstraint(SpringLayout.NORTH, scroller3,
                             5,
                             SpringLayout.SOUTH, lblEnter);
               // Place scroller aka input
               layout.putConstraint(SpringLayout.WEST, scroller,
                             -1,
                             SpringLayout.EAST, scroller3);
             layout.putConstraint(SpringLayout.NORTH, scroller,
                             0,
                             SpringLayout.NORTH, scroller3);
                // Place scroller2 aka output
               layout.putConstraint(SpringLayout.WEST, scroller2,
                             5,
                             SpringLayout.EAST, scroller);
             layout.putConstraint(SpringLayout.NORTH, scroller2,
                             0,
                             SpringLayout.NORTH, scroller);
            // Place parse
               layout.putConstraint(SpringLayout.WEST, parse,
                             10,
                             SpringLayout.WEST, c);
             layout.putConstraint(SpringLayout.NORTH, parse,
                             5,
                             SpringLayout.SOUTH, scroller);
            // Place clear
               layout.putConstraint(SpringLayout.WEST, clear,
                             5,
                             SpringLayout.EAST, parse);
             layout.putConstraint(SpringLayout.NORTH, clear,
                             0,
                             SpringLayout.NORTH, parse);
            // Place exit
               layout.putConstraint(SpringLayout.WEST, exit,
                             5,
                             SpringLayout.EAST, clear);
             layout.putConstraint(SpringLayout.NORTH, exit,
                             0,
                             SpringLayout.NORTH, clear);
               // Button Event Handler
               ButtonHandler handler = new ButtonHandler();
               parse.addActionListener(handler);
               clear.addActionListener(handler);
               exit.addActionListener(handler);
               this.addWindowListener(new WindowAdapter()
                         public void windowClosing(WindowEvent e)
                              System.exit(0);
               setSize(650, 300);
               setVisible(true);
          catch(Exception e)
               e.printStackTrace();
               JOptionPane.showMessageDialog(null, "General Error: See Command Line.", "ERROR - NGIT", JOptionPane.ERROR_MESSAGE);
               System.exit(0);
     private class TextHandler implements Runnable, CaretListener
          public void caretUpdate(CaretEvent e)
               if (!threadflag)
                    threadflag = true;
                    Thread txtThread = new Thread(this);
                    txtThread.start();
          public void run()
               rowVec.removeAllElements();
               for (int i = 1; i <= input.getLineCount(); i++)
                    rowVec.add("" + i);          
               row.setListData(rowVec);
               threadflag = false;
               // Find current row of cursor
               int numrows = 1;
               char[] chararr = input.getText().toCharArray();
               int caretPos = input.getCaretPosition();
               for (int i = (caretPos-1); i >= 0; i--)
                    if (chararr[i] == '\n')
                         numrows++;
               row.setSelectedIndex((numrows-1));
               row.ensureIndexIsVisible((numrows-1));
//Code Continues

Answer 1

Thank you, you did catch an error that I had. I did not want output to have requestFocus(), as you can see just above it I actually wanted input to have it. Also, I put "input.requestFocus()" after I set the visible to true and it works. Thank you for that.
But, I have two main questions. One is, can you do what I described above and have one jscrollpane be invisible, yet still work since it is synched up with another jscrollpane that is visible?
The other question goes with this code below. I do not necessarily want it to scroll to the bottom of the page, just to where the cursor ends. Let's say I already have code in the input JTextArea, and I paste more code above it, I do not want it to scroll to the bottom of the JTextArea, just to where the cursor ends up. I cannot figure out why it is not autoscrolling.
private class TextHandler implements Runnable, CaretListener
          public void caretUpdate(CaretEvent e)
               if (!threadflag)
                    threadflag = true;
                    Thread txtThread = new Thread(this);
                    txtThread.start();
          public void run()
               rowVec.removeAllElements();
               for (int i = 1; i <= input.getLineCount(); i++)
                    rowVec.add("" + i);          
               row.setListData(rowVec);
               // Find current row of cursor
               int numrows = 1;
               char[] chararr = input.getText().toCharArray();
               int caretPos = input.getCaretPosition();
               for (int i = (caretPos-1); i >= 0; i--)
                    if (chararr[i] == '\n')
                         numrows++;
               row.setSelectedIndex(numrows-1);
               row.ensureIndexIsVisible(numrows-1);
               System.out.println("ACTUAL: " + row.getSelectedIndex());
               threadflag = false;
     }