Program: 134821
Project: 134821
Buggy source:
/** 
 * This method initializes ComponentComboBox
 * @return javax.swing.JComboBox
 */
private JComboBox getComponentComboBox(){
  if (ComponentComboBox == null) {
    ComponentComboBox=new JComboBox();
    ComponentComboBox.setPreferredSize(new Dimension(320,24));
    ComponentComboBox.addItemListener(new java.awt.event.ItemListener(){
      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);
      }
    }
);
  }
  return ComponentComboBox;
}

Fixed version (ground truth):
/** 
 * This method initializes ComponentComboBox
 * @return javax.swing.JComboBox
 */
private JComboBox getComponentComboBox(){
  if (ComponentComboBox == null) {
    ComponentComboBox=new JComboBox();
    ComponentComboBox.setPreferredSize(new Dimension(320,24));
    ComponentComboBox.addItemListener(new java.awt.event.ItemListener(){
      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);
      }
    }
);
  }
  return ComponentComboBox;
}