Set<Method> set = new HashSet<>();
    for (Method m : interfaceType.getMethods()) {
      if (declaresInterruptedEx(m)) {
        set.add(m);
      }
    }
    return set;
  }

  private static boolean declaresInterruptedEx(Method method) {
    for (Class<?> exType : method.getExceptionTypes()) {
      // debate: == or isAssignableFrom?