JFrame JScrollPane JPanel döngü JButton --- scrollbar ı çalıştıramadım. Yardım pls.

 
  package zzz001; 
   
  import java.awt.BorderLayout; 
  import java.awt.Color; 
  import java.awt.Dimension; 
  import java.awt.GridBagConstraints; 
  import java.awt.GridBagLayout; 
  import javax.swing.JButton; 
  import javax.swing.JFrame; 
  import javax.swing.JPanel; 
  import javax.swing.JScrollPane; 
   
   
  public class Zzz001 
  { 
      public static void createpencere() 
      { 
          JFrame pencere1 = new JFrame(); 
          pencere1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
          pencere1.setExtendedState(JFrame.MAXIMIZED_BOTH); 
          pencere1.setVisible(true); 
          pencere1.setMinimumSize(new Dimension(600, 400)); 
           
          JPanel panel1 = new JPanel(); 
          panel1.setBackground(Color.RED); 
          panel1.setPreferredSize(new Dimension(300, 0)); 
          panel1.setLayout(new GridBagLayout()); 
           
          JPanel panel2 = new JPanel(); 
          panel2.setBackground(Color.BLUE); 
          panel2.setPreferredSize(new Dimension(600, 0)); 
          panel2.setLayout(new GridBagLayout()); 
           
          JScrollPane bolme1 = new JScrollPane(panel1, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_NEVER); 
          bolme1.setBackground(Color.YELLOW); 
           
          JScrollPane bolme2 = new JScrollPane(panel2, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED); 
          bolme2.setBackground(Color.YELLOW); 
           
          pencere1.add(bolme1, BorderLayout.WEST); 
          pencere1.add(bolme2, BorderLayout.CENTER); 
           
          GridBagConstraints gbc = new GridBagConstraints(); 
   
           
          //Insets insets = panel1.getInsets(); 
          //Dimension size = new Dimension(); 
   
          int y = 0; 
          for(int i=0; i < 50 ; i++) 
          { 
          JButton[] b  = new JButton[50]; 
          b[i]  = new JButton(); 
          b[i].setText("Button "+i); 
          gbc.gridx = 0; 
          gbc.gridy = i; 
          panel1.add(b[i], gbc); 
          } 
           
           
      } 
   
      public static void main(String[] args) { 
          javax.swing.SwingUtilities.invokeLater(new Runnable() { 
              public void run() { 
                  createpencere(); 
              } 
          }); 
      } 
       
  }