Program: 61221
Project: 61221
Buggy source:
@Override protected void populateItem(final ListItem item){
  String mandatoryCondition=schemaTO.getMandatoryCondition();
  boolean required=false;
  if (mandatoryCondition.equalsIgnoreCase("String_Node_Str")) {
    required=true;
  }
  if (schemaTO.getType().getClassName().equals("String_Node_Str")) {
    panel=new AjaxCheckBoxPanel("String_Node_Str",schemaTO.getName(),new Model(){
      @Override public Serializable getObject(){
        return (String)item.getModelObject();
      }
      @Override public void setObject(      Serializable object){
        Boolean val=(Boolean)object;
        item.setModelObject(val.toString());
      }
    }
,required);
  }
 else   if (schemaTO.getType().getClassName().equals("String_Node_Str")) {
    panel=new DateFieldPanel("String_Node_Str",schemaTO.getName(),new Model(){
      @Override public Serializable getObject(){
        DateFormat formatter=new SimpleDateFormat(schemaTO.getConversionPattern());
        Date date=new Date();
        try {
          String dateValue=(String)item.getModelObject();
          if (!dateValue.equals("String_Node_Str"))           date=formatter.parse(dateValue);
 else           date=null;
        }
 catch (        ParseException ex) {
          Logger.getLogger(RoleModalPage.class.getName()).log(Level.SEVERE,null,ex);
        }
        return date;
      }
      @Override public void setObject(      Serializable object){
        Date date=(Date)object;
        Format formatter=new SimpleDateFormat(schemaTO.getConversionPattern());
        String val=formatter.format(date);
        item.setModelObject(val);
      }
    }
,schemaTO.getConversionPattern(),required);
  }
 else {
    panel=new AjaxTextFieldPanel("String_Node_Str",schemaTO.getName(),new Model(){
      @Override public Serializable getObject(){
        return (String)item.getModelObject();
      }
      @Override public void setObject(      Serializable object){
        item.setModelObject((String)object);
      }
    }
,required);
  }
  item.add(panel);
}

Fixed version (ground truth):
@Override protected void populateItem(final ListItem item){
  String mandatoryCondition=schemaTO.getMandatoryCondition();
  boolean required=false;
  if (mandatoryCondition.equalsIgnoreCase("String_Node_Str")) {
    required=true;
  }
  if (schemaTO.getType().getClassName().equals("String_Node_Str")) {
    panel=new AjaxCheckBoxPanel("String_Node_Str",schemaTO.getName(),new Model(){
      @Override public Serializable getObject(){
        return (String)item.getModelObject();
      }
      @Override public void setObject(      Serializable object){
        Boolean val=(Boolean)object;
        item.setModelObject(val.toString());
      }
    }
,required);
  }
 else   if (schemaTO.getType().getClassName().equals("String_Node_Str")) {
    panel=new DateFieldPanel("String_Node_Str",schemaTO.getName(),new Model(){
      @Override public Serializable getObject(){
        DateFormat formatter=new SimpleDateFormat(schemaTO.getConversionPattern());
        Date date=new Date();
        try {
          String dateValue=(String)item.getModelObject();
          if (!dateValue.equals("String_Node_Str"))           date=formatter.parse(dateValue);
 else           date=null;
        }
 catch (        ParseException ex) {
          Logger.getLogger(RoleModalPage.class.getName()).log(Level.SEVERE,null,ex);
        }
        return date;
      }
      @Override public void setObject(      Serializable object){
        Date date=(Date)object;
        Format formatter=new SimpleDateFormat(schemaTO.getConversionPattern());
        String val=formatter.format(date);
        item.setModelObject(val);
      }
    }
,schemaTO.getConversionPattern(),required,schemaTO.isReadonly(),form);
  }
 else {
    panel=new AjaxTextFieldPanel("String_Node_Str",schemaTO.getName(),new Model(){
      @Override public Serializable getObject(){
        return (String)item.getModelObject();
      }
      @Override public void setObject(      Serializable object){
        item.setModelObject((String)object);
      }
    }
,required);
  }
  item.add(panel);
}