@Nullable
  public static AntIntrospector getIntrospector(Class c) {
    try {
      return AntIntrospector.getInstance(c);
    }
    catch (Throwable e) {
      if (e instanceof ControlFlowException) {
        throw e;
      }
      LOG.warn("Unable to get Ant introspector", e);
    }
    return null;
  }
@Nullable
  public static AntIntrospector getIntrospector(Class c)