Program: 184264
Project: 184264
Buggy source:
public RingRoadGamePanel(){
  setLayout(new BorderLayout());
  GameChoicePanel titleBar=new GameChoicePanel(false,"String_Node_Str",true){
    private static final long serialVersionUID=1L;
    @Override public void onNextClicked(){
      goToNextLevel();
    }
  }
;
  add(titleBar,BorderLayout.NORTH);
  ringRoadCanvas=new RingRoadCanvas();
  ringRoadCanvas.setBorder(BorderFactory.createEmptyBorder(UI.PAD,UI.PAD,UI.PAD,UI.PAD));
  ringRoadCanvas.setLayout(new GridBagLayout());
  add(ringRoadCanvas,BorderLayout.CENTER);
  controlPanel=new MessageBubble();
  controlPanel.setLayout(new BorderLayout());
  ringRoadCanvas.add(controlPanel);
  densitySlider=new BigSlider(DENS_MIN_INVKM,DENS_MAX_INVKM,INITIAL_DENSITY_INVKM,HINT_DENSITY_INVKM){
    private static final long serialVersionUID=1L;
{
      setPreferredSize(new Dimension(1,90));
      setBorder(BorderFactory.createEmptyBorder(UI.PAD,0,2 * UI.PAD,0));
    }
    @Override public void onValueUpdated(){
      updateDensity();
    }
  }
;
  controlPanel.add(densitySlider,BorderLayout.NORTH);
  messageContainer=new JPanel();
  messageContainer.setBackground(Color.WHITE);
  controlPanel.add(messageContainer,BorderLayout.CENTER);
  messageLayout=new CardLayout();
  messageContainer.setLayout(messageLayout);
  JPanel freeFlowMessage=new JPanel(new BorderLayout());
  freeFlowMessage.add(UI.makeTrafficReportLabel("String_Node_Str",UI.GREEN),BorderLayout.NORTH);
  freeFlowMessage.add(UI.makeStyledTextPane("String_Node_Str" + "String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"),BorderLayout.CENTER);
  messageContainer.add(freeFlowMessage,FREE_FLOW_CARD);
  JPanel congestionMessage=new JPanel(new BorderLayout());
  congestionMessage.add(UI.makeTrafficReportLabel("String_Node_Str",UI.AMBER),BorderLayout.NORTH);
  congestionMessage.add(UI.makeStyledTextPane("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"),BorderLayout.CENTER);
  messageContainer.add(congestionMessage,CONGESTION_CARD);
  JPanel jamMessage=new JPanel(new BorderLayout());
  jamMessage.add(UI.makeTrafficReportLabel("String_Node_Str",UI.RED),BorderLayout.NORTH);
  jamMessage.add(UI.makeStyledTextPane("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"),BorderLayout.CENTER);
  messageContainer.add(jamMessage,JAM_CARD);
  messageMachine=new ThresholdMachine(MIN_SPEED_THRESHOLDS,MIN_SPEED_CARDS,MIN_SPEED_TOLERANCE);
  messageTimer=new Timer(ADAPTIVE_MESSAGE_TIMER_DELAY_MS,new ActionListener(){
    @Override public void actionPerformed(    ActionEvent e){
      updateMessage();
    }
  }
);
}

Fixed version (ground truth):
public RingRoadGamePanel(){
  setLayout(new BorderLayout());
  GameChoicePanel titleBar=new GameChoicePanel(false,"String_Node_Str",true){
    private static final long serialVersionUID=1L;
    @Override public void onBackClicked(){
      RingRoadGamePanel.this.onBackClicked();
    }
    @Override public void onNextClicked(){
      RingRoadGamePanel.this.onNextClicked();
    }
  }
;
  add(titleBar,BorderLayout.NORTH);
  ringRoadCanvas=new RingRoadCanvas();
  ringRoadCanvas.setBorder(BorderFactory.createEmptyBorder(UI.PAD,UI.PAD,UI.PAD,UI.PAD));
  ringRoadCanvas.setLayout(new GridBagLayout());
  add(ringRoadCanvas,BorderLayout.CENTER);
  controlPanel=new MessageBubble();
  controlPanel.setLayout(new BorderLayout());
  ringRoadCanvas.add(controlPanel);
  densitySlider=new BigSlider(DENS_MIN_INVKM,DENS_MAX_INVKM,INITIAL_DENSITY_INVKM,HINT_DENSITY_INVKM){
    private static final long serialVersionUID=1L;
{
      setPreferredSize(new Dimension(1,90));
      setBorder(BorderFactory.createEmptyBorder(UI.PAD,0,2 * UI.PAD,0));
    }
    @Override public void onValueUpdated(){
      updateDensity();
    }
  }
;
  controlPanel.add(densitySlider,BorderLayout.NORTH);
  messageContainer=new JPanel();
  messageContainer.setBackground(Color.WHITE);
  controlPanel.add(messageContainer,BorderLayout.CENTER);
  messageLayout=new CardLayout();
  messageContainer.setLayout(messageLayout);
  JPanel freeFlowMessage=new JPanel(new BorderLayout());
  freeFlowMessage.add(UI.makeTrafficReportLabel("String_Node_Str",UI.GREEN),BorderLayout.NORTH);
  freeFlowMessage.add(UI.makeStyledTextPane("String_Node_Str" + "String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"),BorderLayout.CENTER);
  messageContainer.add(freeFlowMessage,FREE_FLOW_CARD);
  JPanel congestionMessage=new JPanel(new BorderLayout());
  congestionMessage.add(UI.makeTrafficReportLabel("String_Node_Str",UI.AMBER),BorderLayout.NORTH);
  congestionMessage.add(UI.makeStyledTextPane("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"),BorderLayout.CENTER);
  messageContainer.add(congestionMessage,CONGESTION_CARD);
  JPanel jamMessage=new JPanel(new BorderLayout());
  jamMessage.add(UI.makeTrafficReportLabel("String_Node_Str",UI.RED),BorderLayout.NORTH);
  jamMessage.add(UI.makeStyledTextPane("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"),BorderLayout.CENTER);
  messageContainer.add(jamMessage,JAM_CARD);
  messageMachine=new ThresholdMachine(MIN_SPEED_THRESHOLDS,MIN_SPEED_CARDS,MIN_SPEED_TOLERANCE);
  messageTimer=new Timer(ADAPTIVE_MESSAGE_TIMER_DELAY_MS,new ActionListener(){
    @Override public void actionPerformed(    ActionEvent e){
      updateMessage();
    }
  }
);
}