public static void restoreAllPreferencesToDefault() throws BackingStoreException {
    IEclipsePreferences rootNode = PreferencesService.getDefault().getRootNode();
    clearAll(rootNode);
  }

  private static void clearAll(Preferences node) throws BackingStoreException {
    node.clear();
    String[] names = node.childrenNames();
    for (String name : names) {
      clearAll(node.node(name));
    }
  }