Program: 168597
Project: 168597
Buggy source:
private void populateNode(DefaultMutableTreeNode rootNode,HFSPlusCatalogLeafRecord[] contents){
  boolean folderThreadSet=false;
  boolean hasChildren=false;
  LinkedList<HFSPlusCatalogLeafRecord> fileThreads=new LinkedList<HFSPlusCatalogLeafRecord>();
  for (  HFSPlusCatalogLeafRecord rec : contents) {
    Vector<String> currentRow=new Vector<String>(4);
    HFSPlusCatalogLeafRecordData recData=rec.getData();
    if (recData.getRecordType() == HFSPlusCatalogLeafRecordData.RECORD_TYPE_FILE && recData instanceof HFSPlusCatalogFile) {
      HFSPlusCatalogFile catFile=(HFSPlusCatalogFile)recData;
      if (!hasChildren)       hasChildren=true;
    }
 else     if (recData.getRecordType() == HFSPlusCatalogLeafRecordData.RECORD_TYPE_FOLDER && recData instanceof HFSPlusCatalogFolder) {
      HFSPlusCatalogFolder catFolder=(HFSPlusCatalogFolder)recData;
      rootNode.add(new NoLeafMutableTreeNode(new RecordNodeStorage(rec)));
      if (!hasChildren)       hasChildren=true;
    }
 else     if (recData.getRecordType() == HFSPlusCatalogLeafRecordData.RECORD_TYPE_FOLDER_THREAD && recData instanceof HFSPlusCatalogThread) {
      HFSPlusCatalogThread catThread=(HFSPlusCatalogThread)recData;
      rootNode.setUserObject(new RecordNodeStorage(rec));
      if (!folderThreadSet)       folderThreadSet=true;
    }
 else     if (recData.getRecordType() == HFSPlusCatalogLeafRecordData.RECORD_TYPE_FILE_THREAD && recData instanceof HFSPlusCatalogThread) {
      HFSPlusCatalogThread catThread=(HFSPlusCatalogThread)recData;
      fileThreads.addLast(rec);
    }
 else     System.err.println("String_Node_Str" + recData.getRecordType() + "String_Node_Str");
  }
  if (hasChildren && !folderThreadSet)   System.err.println("String_Node_Str");
  if (!fileThreads.isEmpty())   System.err.println("String_Node_Str" + fileThreads.size() + "String_Node_Str");
}

Fixed version (ground truth):
private void populateNode(DefaultMutableTreeNode rootNode,HFSPlusCatalogLeafRecord[] contents){
  boolean folderThreadSet=false;
  boolean hasChildren=false;
  Object o=rootNode.getUserObject();
  if (o instanceof RecordNodeStorage) {
    RecordNodeStorage rootStorage=(RecordNodeStorage)o;
    LinkedList<HFSPlusCatalogLeafRecord> fileThreads=new LinkedList<HFSPlusCatalogLeafRecord>();
    for (    HFSPlusCatalogLeafRecord rec : contents) {
      Vector<String> currentRow=new Vector<String>(4);
      HFSPlusCatalogLeafRecordData recData=rec.getData();
      if (recData.getRecordType() == HFSPlusCatalogLeafRecordData.RECORD_TYPE_FILE && recData instanceof HFSPlusCatalogFile) {
        HFSPlusCatalogFile catFile=(HFSPlusCatalogFile)recData;
        if (!hasChildren)         hasChildren=true;
      }
 else       if (recData.getRecordType() == HFSPlusCatalogLeafRecordData.RECORD_TYPE_FOLDER && recData instanceof HFSPlusCatalogFolder) {
        HFSPlusCatalogFolder catFolder=(HFSPlusCatalogFolder)recData;
        rootNode.add(new NoLeafMutableTreeNode(new RecordNodeStorage(rec)));
        if (!hasChildren)         hasChildren=true;
      }
 else       if (recData.getRecordType() == HFSPlusCatalogLeafRecordData.RECORD_TYPE_FOLDER_THREAD && recData instanceof HFSPlusCatalogThread) {
        HFSPlusCatalogThread catThread=(HFSPlusCatalogThread)recData;
        rootStorage.setThread(rec);
        if (!folderThreadSet)         folderThreadSet=true;
      }
 else       if (recData.getRecordType() == HFSPlusCatalogLeafRecordData.RECORD_TYPE_FILE_THREAD && recData instanceof HFSPlusCatalogThread) {
        HFSPlusCatalogThread catThread=(HFSPlusCatalogThread)recData;
        fileThreads.addLast(rec);
      }
 else       System.err.println("String_Node_Str" + recData.getRecordType() + "String_Node_Str");
    }
    if (hasChildren && !folderThreadSet)     System.err.println("String_Node_Str");
    if (!fileThreads.isEmpty())     System.err.println("String_Node_Str" + fileThreads.size() + "String_Node_Str");
  }
 else   JOptionPane.showMessageDialog(this,"String_Node_Str" + o.getClass(),"String_Node_Str",JOptionPane.ERROR_MESSAGE);
}