if (editingComponent == null) configureEditingComponent(tree, renderer, realEditor);  if (realEditor.stopCellEditing())
if (editingComponent != null && realEditor.stopCellEditing())
  public boolean stopCellEditing()  {    if (editingComponent == null)      configureEditingComponent(tree, renderer, realEditor);        if (realEditor.stopCellEditing())      {        timer.stop();        tree.setCellEditor(null);        return true;      }    return false;  }