Utilities { public static boolean isBlankString(Serializable serializable) { return serializable instanceof String && StringUtils.isBlank((String) serializable); }  static boolean isBlankString(Serializable serializable); static boolean isNotBlankString(Serializable serializable); static boolean isAlphanumericString(Serializable serializable); static boolean isNotStringNone(Serializable serializable);  }
@Test public void testIsBlankString() throws Exception { assertThat(Utilities.isBlankString(" "), is(true)); assertThat(Utilities.isNotBlankString(" "), is(false)); }