Program: 49909
Project: 49909
Buggy source:
@Override public void actionPerformed(ActionEvent event){
  Object[] options=new String[]{"String_Node_Str","String_Node_Str","String_Node_Str"};
switch (JOptionPane.showOptionDialog(Driver.getInstance(),"String_Node_Str","String_Node_Str",JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.PLAIN_MESSAGE,null,options,options[0])) {
case JOptionPane.YES_OPTION:
    JFileChooser fileChooser=new JFileChooser("String_Node_Str");
  fileChooser.setFileFilter(new FileFilter(){
    @Override public String getDescription(){
      return "String_Node_Str";
    }
    @Override public boolean accept(    File f){
      if (f.isDirectory() || f.getName().endsWith("String_Node_Str"))       return true;
 else       return false;
    }
  }
);
if (fileChooser.showOpenDialog(Driver.getInstance()) == JFileChooser.APPROVE_OPTION) {
  try {
    if (m_isDarkImage) {
      mDarkImage=ImageIO.read(new File(fileChooser.toString()));
      m_imageLabel.setIcon(new ImageIcon(mDarkImage.getScaledInstance(48,48,Image.SCALE_SMOOTH)));
    }
 else {
      mLightImage=ImageIO.read(new File(fileChooser.toString()));
      m_imageLabel.setIcon(new ImageIcon(mLightImage.getScaledInstance(48,48,Image.SCALE_SMOOTH)));
    }
  }
 catch (  IOException e) {
    e.printStackTrace();
  }
}
break;
case JOptionPane.NO_OPTION:
String url=JOptionPane.showInputDialog(Driver.getInstance(),"String_Node_Str","String_Node_Str",JOptionPane.PLAIN_MESSAGE);
try {
if (m_isDarkImage) {
mDarkImage=ImageIO.read(new URL(url));
m_imageLabel.setIcon(new ImageIcon(mDarkImage.getScaledInstance(48,48,Image.SCALE_SMOOTH)));
}
 else {
mLightImage=ImageIO.read(new URL(url));
m_imageLabel.setIcon(new ImageIcon(mLightImage.getScaledInstance(48,48,Image.SCALE_SMOOTH)));
}
}
 catch (Exception e) {
e.printStackTrace();
}
break;
case JOptionPane.CANCEL_OPTION:
break;
}
}

Fixed version (ground truth):
@Override public void actionPerformed(ActionEvent event){
  Object[] options=new String[]{"String_Node_Str","String_Node_Str","String_Node_Str"};
switch (JOptionPane.showOptionDialog(Driver.getInstance(),"String_Node_Str","String_Node_Str",JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.PLAIN_MESSAGE,null,options,options[0])) {
case JOptionPane.YES_OPTION:
    JFileChooser fileChooser=new JFileChooser("String_Node_Str");
  fileChooser.setFileFilter(new FileFilter(){
    @Override public String getDescription(){
      return "String_Node_Str";
    }
    @Override public boolean accept(    File f){
      if (f.isDirectory() || f.getName().endsWith("String_Node_Str"))       return true;
 else       return false;
    }
  }
);
if (fileChooser.showOpenDialog(Driver.getInstance()) == JFileChooser.APPROVE_OPTION) {
  try {
    if (m_isDarkImage) {
      mDarkImage=ImageIO.read(fileChooser.getSelectedFile());
      m_imageLabel.setIcon(new ImageIcon(mDarkImage.getScaledInstance(48,48,Image.SCALE_SMOOTH)));
    }
 else {
      mLightImage=ImageIO.read(fileChooser.getSelectedFile());
      m_imageLabel.setIcon(new ImageIcon(mLightImage.getScaledInstance(48,48,Image.SCALE_SMOOTH)));
    }
  }
 catch (  IOException e) {
    e.printStackTrace();
  }
}
break;
case JOptionPane.NO_OPTION:
String url=JOptionPane.showInputDialog(Driver.getInstance(),"String_Node_Str","String_Node_Str",JOptionPane.PLAIN_MESSAGE);
try {
if (m_isDarkImage) {
mDarkImage=ImageIO.read(new URL(url));
m_imageLabel.setIcon(new ImageIcon(mDarkImage.getScaledInstance(48,48,Image.SCALE_SMOOTH)));
}
 else {
mLightImage=ImageIO.read(new URL(url));
m_imageLabel.setIcon(new ImageIcon(mLightImage.getScaledInstance(48,48,Image.SCALE_SMOOTH)));
}
}
 catch (Exception e) {
e.printStackTrace();
}
break;
case JOptionPane.CANCEL_OPTION:
break;
}
}