Program: 81553
Project: 81553
Buggy source:
private JPanel initialize(){
  JPanel buttonPanel=new JPanel();
  buttonPanel.setLayout(new BoxLayout(buttonPanel,BoxLayout.LINE_AXIS));
  buttonPanel.add(Box.createHorizontalGlue());
  JButton buttonCancel=new JButton("String_Node_Str");
  buttonCancel.addActionListener(new ActionListener(){
    public void actionPerformed(    ActionEvent e){
      onCancel();
    }
  }
);
  buttonPanel.add(buttonCancel);
  buttonPanel.add(Box.createRigidArea(new Dimension(10,0)));
  JButton buttonOK=new JButton("String_Node_Str");
  getRootPane().setDefaultButton(buttonOK);
  buttonOK.addActionListener(new ActionListener(){
    public void actionPerformed(    ActionEvent e){
      onOK();
    }
  }
);
  buttonPanel.add(buttonOK);
  slider=new GradientSlider(MultiThumbSlider.HORIZONTAL);
  slider.setValues(currentGradient.getFractions(),currentGradient.getColors());
  slider.setPaintTicks(true);
  slider.putClientProperty("String_Node_Str","String_Node_Str");
  slider.putClientProperty("String_Node_Str","String_Node_Str");
  slider.setToolTipText("String_Node_Str" + "String_Node_Str");
  JPanel labelPanel=new JPanel();
  labelPanel.setLayout(new BoxLayout(labelPanel,BoxLayout.LINE_AXIS));
  labelPanel.add(minLabel);
  labelPanel.add(Box.createHorizontalGlue());
  labelPanel.add(medLabel);
  labelPanel.add(Box.createHorizontalGlue());
  labelPanel.add(maxLabel);
  JPanel contentPane=new JPanel(new GridBagLayout());
  GridBagConstraints constraints=new GridBagConstraints();
  constraints.insets=new Insets(5,15,0,15);
  constraints.fill=GridBagConstraints.BOTH;
  constraints.weightx=1;
  constraints.weighty=-1;
  constraints.gridx=0;
  int index=0;
  String[] populations=heatMapModel.getReferencePopulations();
  for (  String population : populations) {
    populationPanels.add(new PopulationPanel(this,population));
    constraints.gridy=index;
    contentPane.add(populationPanels.get(index++),constraints);
  }
  constraints.weighty=0.8;
  constraints.gridy=index;
  constraints.insets=new Insets(5,10,0,10);
  contentPane.add(slider,constraints);
  constraints.insets=new Insets(0,10,20,10);
  constraints.gridy=++index;
  constraints.weighty=-1;
  contentPane.add(labelPanel,constraints);
  constraints.insets=new Insets(0,10,0,10);
  constraints.gridy=++index;
  constraints.weighty=0.2;
  contentPane.add(buttonPanel,constraints);
  setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
  addWindowListener(new WindowAdapter(){
    public void windowClosing(    WindowEvent e){
      onCancel();
    }
  }
);
  contentPane.registerKeyboardAction(new ActionListener(){
    public void actionPerformed(    ActionEvent e){
      onCancel();
    }
  }
,KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE,0),JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
  return contentPane;
}

Fixed version (ground truth):
private JPanel initialize(){
  JPanel buttonPanel=new JPanel();
  buttonPanel.setLayout(new BoxLayout(buttonPanel,BoxLayout.LINE_AXIS));
  buttonPanel.add(Box.createHorizontalGlue());
  JButton buttonCancel=new JButton("String_Node_Str");
  buttonCancel.addActionListener(new ActionListener(){
    public void actionPerformed(    ActionEvent e){
      onCancel();
    }
  }
);
  buttonPanel.add(buttonCancel);
  buttonPanel.add(Box.createRigidArea(new Dimension(10,0)));
  JButton buttonOK=new JButton("String_Node_Str");
  getRootPane().setDefaultButton(buttonOK);
  buttonOK.addActionListener(new ActionListener(){
    public void actionPerformed(    ActionEvent e){
      onOK();
    }
  }
);
  buttonPanel.add(buttonOK);
  slider=new GradientSlider(MultiThumbSlider.HORIZONTAL);
  slider.setValues(currentGradient.getFractions(),currentGradient.getColors());
  slider.setPaintTicks(true);
  slider.putClientProperty("String_Node_Str","String_Node_Str");
  slider.putClientProperty("String_Node_Str","String_Node_Str");
  slider.setToolTipText("String_Node_Str" + "String_Node_Str");
  JPanel labelPanel=new JPanel();
  labelPanel.setLayout(new BoxLayout(labelPanel,BoxLayout.LINE_AXIS));
  labelPanel.add(minLabel);
  labelPanel.add(Box.createHorizontalGlue());
  labelPanel.add(medLabel);
  labelPanel.add(Box.createHorizontalGlue());
  labelPanel.add(maxLabel);
  populationPanel=new JPanel(new GridBagLayout());
  JPanel contentPane=new JPanel(new GridBagLayout());
  GridBagConstraints constraints=new GridBagConstraints();
  constraints.insets=new Insets(5,15,0,15);
  constraints.fill=GridBagConstraints.BOTH;
  constraints.weightx=1;
  constraints.weighty=-1;
  constraints.gridx=0;
  constraints.gridy=0;
  contentPane.add(populationPanel,constraints);
  constraints.weighty=0.8;
  constraints.gridy=1;
  constraints.insets=new Insets(5,10,0,10);
  contentPane.add(slider,constraints);
  constraints.insets=new Insets(0,10,20,10);
  constraints.gridy=2;
  constraints.weighty=-1;
  contentPane.add(labelPanel,constraints);
  constraints.insets=new Insets(0,10,0,10);
  constraints.gridy=3;
  constraints.weighty=0.2;
  contentPane.add(buttonPanel,constraints);
  setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
  addWindowListener(new WindowAdapter(){
    public void windowClosing(    WindowEvent e){
      onCancel();
    }
  }
);
  contentPane.registerKeyboardAction(new ActionListener(){
    public void actionPerformed(    ActionEvent e){
      onCancel();
    }
  }
,KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE,0),JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
  return contentPane;
}