Program: 134822
Project: 134822
Buggy source:
public void itemStateChanged(java.awt.event.ItemEvent e){
  if (e.getStateChange() == java.awt.event.ItemEvent.DESELECTED)   return;
  PropertyComboBox.setEnabled(true);
  String comp=e.getItem().toString();
  PropertyComboBox.removeAllItems();
  for (int i=0; i < compList.length; i++) {
    if (compList[i].compareTo(comp) == 0) {
      if (propList.get(i) == null) {
        List<String> list=SampTool.getPropsForComponent(compList[i]);
        if (list == null) {
          PropertyComboBox.removeAllItems();
          PropertyComboBox.setEnabled(false);
          ComponentComboBox.hidePopup();
          JOptionPane.showMessageDialog(PropertyComboBox.getParent().getParent(),"String_Node_Str" + comp + "String_Node_Str"+ "String_Node_Str"+ "String_Node_Str","String_Node_Str",JOptionPane.ERROR_MESSAGE);
        }
 else {
          propList.add(i,list);
        }
      }
      try {
        if (propList.get(i) != null) {
          final int k=i;
          SwingWorker<Object,Object> sw=new SwingWorker<Object,Object>(){
            public Object doInBackground(){
              fillPropertyComboBox(propList.get(k));
              return null;
            }
          }
;
          sw.execute();
        }
      }
 catch (      IndexOutOfBoundsException ex) {
        PropertyComboBox.removeAllItems();
        PropertyComboBox.setEnabled(false);
      }
catch (      Exception e1) {
        System.out.println("String_Node_Str" + e1);
      }
    }
  }
  if (PropertyComboBox.getItemCount() == 0)   addSampleButton.setEnabled(false);
 else   addSampleButton.setEnabled(true);
}

Fixed version (ground truth):
public void itemStateChanged(java.awt.event.ItemEvent e){
  if (e.getStateChange() == java.awt.event.ItemEvent.DESELECTED)   return;
  PropertyComboBox.setEnabled(true);
  String comp=e.getItem().toString();
  PropertyComboBox.removeAllItems();
  for (int i=0; i < compList.length; i++) {
    if (compList[i].compareTo(comp) == 0) {
      if (propList.get(i) == null) {
        final int k=i;
        SwingWorker<List<String>,Object> sw=new SwingWorker<List<String>,Object>(){
          public List<String> doInBackground(){
            ComponentComboBox.setEnabled(false);
            PropertyComboBox.setEnabled(false);
            List<String> list_=SampTool.getPropsForComponent(compList[k]);
            return list_;
          }
          public void done(){
            ComponentComboBox.setEnabled(true);
            PropertyComboBox.setEnabled(true);
          }
        }
;
        sw.execute();
        try {
          List<String> list=sw.get();
          if (list == null) {
            PropertyComboBox.removeAllItems();
            PropertyComboBox.setEnabled(false);
            ComponentComboBox.hidePopup();
            JOptionPane.showMessageDialog(PropertyComboBox.getParent().getParent(),"String_Node_Str" + comp + "String_Node_Str"+ "String_Node_Str"+ "String_Node_Str","String_Node_Str",JOptionPane.ERROR_MESSAGE);
          }
 else {
            propList.add(i,list);
          }
        }
 catch (        InterruptedException e1) {
          e1.printStackTrace();
        }
catch (        ExecutionException e1) {
          e1.printStackTrace();
        }
      }
      try {
        if (propList.get(i) != null) {
          fillPropertyComboBox(propList.get(i));
        }
      }
 catch (      IndexOutOfBoundsException ex) {
        PropertyComboBox.removeAllItems();
        PropertyComboBox.setEnabled(false);
      }
catch (      Exception e1) {
        System.out.println("String_Node_Str" + e1);
      }
    }
  }
  if (PropertyComboBox.getItemCount() == 0)   addSampleButton.setEnabled(false);
 else   addSampleButton.setEnabled(true);
}