Program: 32306
Project: 32306
Buggy source:
@Override public void run(){
  panel=new JPanel();
  scroll=new JScrollPane(panel,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
  scroll.setBorder(BorderFactory.createEmptyBorder());
  JLabel shLabel=new JLabel("String_Node_Str");
  JLabel portLabel=new JLabel("String_Node_Str");
  JLabel interfaceLabel=new JLabel("String_Node_Str");
  portField=new JTextField(Integer.toString(port));
  interfaceField=new JTextField(ip);
  requestHookURLField=new JTextField(requestHookURL);
  JButton saveButton=new JButton("String_Node_Str");
  saveButton.addActionListener(new ActionListener(){
    @Override public void actionPerformed(    ActionEvent e){
      stdout.println("String_Node_Str");
      saveConfig();
    }
  }
);
  GroupLayout layout=new GroupLayout(panel);
  panel.setLayout(layout);
  layout.setAutoCreateGaps(true);
  layout.setAutoCreateContainerGaps(true);
  GroupLayout.SequentialGroup hGroup=layout.createSequentialGroup();
  hGroup.addGroup(layout.createParallelGroup().addComponent(interfaceLabel).addComponent(portLabel).addComponent(shLabel).addComponent(saveButton));
  hGroup.addGroup(layout.createParallelGroup().addComponent(interfaceField).addComponent(portField).addComponent(requestHookURLField));
  layout.setHorizontalGroup(hGroup);
  GroupLayout.SequentialGroup vGroup=layout.createSequentialGroup();
  vGroup.addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(interfaceLabel).addComponent(interfaceField));
  vGroup.addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(portLabel).addComponent(portField));
  vGroup.addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(shLabel).addComponent(requestHookURLField));
  vGroup.addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(saveButton));
  layout.setVerticalGroup(vGroup);
  restoreConfig();
  callbacks.customizeUiComponent(scroll);
  callbacks.addSuiteTab(BurpExtender.this);
}

Fixed version (ground truth):
@Override public void run(){
  panel=new JPanel();
  scroll=new JScrollPane(panel,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
  scroll.setBorder(BorderFactory.createEmptyBorder());
  JLabel shLabel=new JLabel("String_Node_Str");
  JLabel portLabel=new JLabel("String_Node_Str");
  JLabel interfaceLabel=new JLabel("String_Node_Str");
  portField=new JTextField(Integer.toString(DEFAULT_PORT));
  interfaceField=new JTextField(DEFAULT_IP);
  requestHookURLField=new JTextField(DEFAULT_REQUEST_HOOK_URL);
  JButton saveButton=new JButton("String_Node_Str");
  saveButton.addActionListener(new ActionListener(){
    @Override public void actionPerformed(    ActionEvent e){
      stdout.println("String_Node_Str");
      saveConfig();
    }
  }
);
  GroupLayout layout=new GroupLayout(panel);
  panel.setLayout(layout);
  layout.setAutoCreateGaps(true);
  layout.setAutoCreateContainerGaps(true);
  GroupLayout.SequentialGroup hGroup=layout.createSequentialGroup();
  hGroup.addGroup(layout.createParallelGroup().addComponent(interfaceLabel).addComponent(portLabel).addComponent(shLabel).addComponent(saveButton));
  hGroup.addGroup(layout.createParallelGroup().addComponent(interfaceField).addComponent(portField).addComponent(requestHookURLField));
  layout.setHorizontalGroup(hGroup);
  GroupLayout.SequentialGroup vGroup=layout.createSequentialGroup();
  vGroup.addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(interfaceLabel).addComponent(interfaceField));
  vGroup.addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(portLabel).addComponent(portField));
  vGroup.addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(shLabel).addComponent(requestHookURLField));
  vGroup.addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE).addComponent(saveButton));
  layout.setVerticalGroup(vGroup);
  restoreConfig();
  callbacks.customizeUiComponent(scroll);
  callbacks.addSuiteTab(BurpExtender.this);
}