public static NotFoundException clusterNotFound(String appId, String clusterName) {
    return new NotFoundException("cluster not found for appId:%s clusterName:%s", appId, clusterName);
  }
@Test
  public void testClusterNotFoundException() {
    NotFoundException exception = NotFoundException.clusterNotFound(appId, clusterName);
    assertEquals(exception.getMessage(), "cluster not found for appId:app-1001 clusterName:test");
  }