Program: 3807
Project: 3807
Buggy source:
public void setupCellRenderers(Category category,AbstractLibraryFormat format){
  for (int i=0; i < format.getColumnCount(); i++) {
    Class clazz=format.getColumnClass(i);
    if (clazz == String.class) {
      setCellRenderer(i,defaultCellRenderer.get());
    }
  }
  if (category != null) {
switch (category) {
case AUDIO:
      setCellRenderer(AudioTableFormat.PLAY_INDEX,isPlayingRenderer.get());
    setUnsortable(AudioTableFormat.PLAY_INDEX);
  setCellRenderer(AudioTableFormat.SIZE_INDEX,fileSizeRenderer.get());
setCellRenderer(AudioTableFormat.LENGTH_INDEX,timeRenderer.get());
setCellRenderer(AudioTableFormat.TITLE_INDEX,nameRenderer.get());
setCellRenderer(AudioTableFormat.ACTION_INDEX,removeRenderer.get());
setCellEditor(AudioTableFormat.ACTION_INDEX,removeEditor);
setUnsortable(AudioTableFormat.ACTION_INDEX);
break;
case VIDEO:
setCellRenderer(VideoTableFormat.LENGTH_INDEX,timeRenderer.get());
setCellRenderer(VideoTableFormat.SIZE_INDEX,fileSizeRenderer.get());
setCellRenderer(VideoTableFormat.NAME_INDEX,nameRenderer.get());
setCellRenderer(VideoTableFormat.ACTION_INDEX,removeRenderer.get());
setCellEditor(VideoTableFormat.ACTION_INDEX,removeEditor);
setUnsortable(VideoTableFormat.ACTION_INDEX);
break;
case IMAGE:
setCellRenderer(ImageTableFormat.SIZE_INDEX,fileSizeRenderer.get());
setCellRenderer(ImageTableFormat.ACTION_INDEX,removeRenderer.get());
setCellEditor(ImageTableFormat.ACTION_INDEX,removeEditor);
setUnsortable(ImageTableFormat.ACTION_INDEX);
break;
case DOCUMENT:
setCellRenderer(DocumentTableFormat.NAME_INDEX,iconLabelRenderer);
setCellRenderer(DocumentTableFormat.SIZE_INDEX,fileSizeRenderer.get());
setCellRenderer(DocumentTableFormat.ACTION_INDEX,removeRenderer.get());
setCellEditor(DocumentTableFormat.ACTION_INDEX,removeEditor);
setUnsortable(DocumentTableFormat.ACTION_INDEX);
break;
case PROGRAM:
setCellRenderer(ProgramTableFormat.NAME_INDEX,iconLabelRenderer);
setCellRenderer(ProgramTableFormat.SIZE_INDEX,fileSizeRenderer.get());
setCellRenderer(ProgramTableFormat.ACTION_INDEX,removeRenderer.get());
setCellEditor(ProgramTableFormat.ACTION_INDEX,removeEditor);
setUnsortable(ProgramTableFormat.ACTION_INDEX);
break;
case OTHER:
setCellRenderer(OtherTableFormat.NAME_INDEX,iconLabelRenderer);
setCellRenderer(OtherTableFormat.SIZE_INDEX,fileSizeRenderer.get());
setCellRenderer(OtherTableFormat.ACTION_INDEX,removeRenderer.get());
setCellEditor(OtherTableFormat.ACTION_INDEX,removeEditor);
setUnsortable(OtherTableFormat.ACTION_INDEX);
break;
default :
throw new IllegalArgumentException("String_Node_Str" + category);
}
}
 else {
setCellRenderer(AllTableFormat.PLAY_INDEX,isPlayingRenderer.get());
setUnsortable(AllTableFormat.PLAY_INDEX);
setCellRenderer(AllTableFormat.NAME_INDEX,nameCategoryRenderer.get());
setCellRenderer(AllTableFormat.SIZE_INDEX,fileSizeRenderer.get());
setCellRenderer(AllTableFormat.ACTION_INDEX,removeRenderer.get());
setCellEditor(AllTableFormat.ACTION_INDEX,removeEditor);
setUnsortable(AllTableFormat.ACTION_INDEX);
}
}

Fixed version (ground truth):
public void setupCellRenderers(Category category,AbstractLibraryFormat format){
  for (int i=0; i < format.getColumnCount(); i++) {
    Class clazz=format.getColumnClass(i);
    if (clazz == String.class) {
      setCellRenderer(i,defaultCellRenderer.get());
    }
  }
  if (category != null) {
switch (category) {
case AUDIO:
      setHeaderRenderer(AudioTableFormat.LENGTH_INDEX,new TableCellHeaderRenderer(JLabel.TRAILING));
    setCellRenderer(AudioTableFormat.PLAY_INDEX,isPlayingRenderer.get());
  setUnsortable(AudioTableFormat.PLAY_INDEX);
setCellRenderer(AudioTableFormat.SIZE_INDEX,fileSizeRenderer.get());
setCellRenderer(AudioTableFormat.LENGTH_INDEX,timeRenderer.get());
setCellRenderer(AudioTableFormat.TITLE_INDEX,nameRenderer.get());
setCellRenderer(AudioTableFormat.ACTION_INDEX,removeRenderer.get());
setCellEditor(AudioTableFormat.ACTION_INDEX,removeEditor);
setUnsortable(AudioTableFormat.ACTION_INDEX);
break;
case VIDEO:
setHeaderRenderer(VideoTableFormat.LENGTH_INDEX,new TableCellHeaderRenderer(JLabel.TRAILING));
setCellRenderer(VideoTableFormat.LENGTH_INDEX,timeRenderer.get());
setCellRenderer(VideoTableFormat.SIZE_INDEX,fileSizeRenderer.get());
setCellRenderer(VideoTableFormat.NAME_INDEX,nameRenderer.get());
setCellRenderer(VideoTableFormat.ACTION_INDEX,removeRenderer.get());
setCellEditor(VideoTableFormat.ACTION_INDEX,removeEditor);
setUnsortable(VideoTableFormat.ACTION_INDEX);
break;
case IMAGE:
setCellRenderer(ImageTableFormat.SIZE_INDEX,fileSizeRenderer.get());
setCellRenderer(ImageTableFormat.ACTION_INDEX,removeRenderer.get());
setCellEditor(ImageTableFormat.ACTION_INDEX,removeEditor);
setUnsortable(ImageTableFormat.ACTION_INDEX);
break;
case DOCUMENT:
setCellRenderer(DocumentTableFormat.NAME_INDEX,iconLabelRenderer);
setCellRenderer(DocumentTableFormat.SIZE_INDEX,fileSizeRenderer.get());
setCellRenderer(DocumentTableFormat.ACTION_INDEX,removeRenderer.get());
setCellEditor(DocumentTableFormat.ACTION_INDEX,removeEditor);
setUnsortable(DocumentTableFormat.ACTION_INDEX);
break;
case PROGRAM:
setCellRenderer(ProgramTableFormat.NAME_INDEX,iconLabelRenderer);
setCellRenderer(ProgramTableFormat.SIZE_INDEX,fileSizeRenderer.get());
setCellRenderer(ProgramTableFormat.ACTION_INDEX,removeRenderer.get());
setCellEditor(ProgramTableFormat.ACTION_INDEX,removeEditor);
setUnsortable(ProgramTableFormat.ACTION_INDEX);
break;
case OTHER:
setCellRenderer(OtherTableFormat.NAME_INDEX,iconLabelRenderer);
setCellRenderer(OtherTableFormat.SIZE_INDEX,fileSizeRenderer.get());
setCellRenderer(OtherTableFormat.ACTION_INDEX,removeRenderer.get());
setCellEditor(OtherTableFormat.ACTION_INDEX,removeEditor);
setUnsortable(OtherTableFormat.ACTION_INDEX);
break;
default :
throw new IllegalArgumentException("String_Node_Str" + category);
}
}
 else {
setCellRenderer(AllTableFormat.PLAY_INDEX,isPlayingRenderer.get());
setUnsortable(AllTableFormat.PLAY_INDEX);
setCellRenderer(AllTableFormat.NAME_INDEX,nameCategoryRenderer.get());
setCellRenderer(AllTableFormat.SIZE_INDEX,fileSizeRenderer.get());
setCellRenderer(AllTableFormat.ACTION_INDEX,removeRenderer.get());
setCellEditor(AllTableFormat.ACTION_INDEX,removeEditor);
setUnsortable(AllTableFormat.ACTION_INDEX);
}
}