* message: The size of {item} must be between {min} and {max}.
     * </pre>
     * @param property The property name for the message. (NotNull)
     * @param min The parameter min for message. (NotNull)
     * @param max The parameter max for message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addConstraintsSizeMessage(String property, String min, String max) {
        assertPropertyNotNull(property);

     * @param propertyKey The key of the property. (NotNull)
     * @return The value of found property. (NotNull: if not found, exception)
     * @throws ConfigPropertyNotFoundException When the property is not found.
     */
    String get(String propertyKey);

    /**
     * Is the property true?
     * @param propertyKey The key of the property which is boolean type. (NotNull)

     * @param level The parameter value of level. (NotNull)
     */
    public void setLevel(String level) {
        registerVariable("level", level);
    }

    /**
     * Set the value of hostname, used in parameter comment. <br>
     * Even if empty string, treated as empty plainly. So "IF pmb != null" is false if empty.
     * @param hostname The parameter value of hostname. (NotNull)
     */

        MultiValidationBean bean = new MultiValidationBean();
        bean.setRequiredCron(null); // Violates NotNull

        Set<ConstraintViolation<MultiValidationBean>> violations = validator.validate(bean);
        assertEquals(1, violations.size()); // Only NotNull violation

        bean.setRequiredCron("invalid"); // Now violates CronExpression
        violations = validator.validate(bean);

  }

  public void testNotNull_apply() {
    Predicate<@Nullable Integer> notNull = Predicates.notNull();
    assertFalse(notNull.apply(null));
    assertTrue(notNull.apply(1));
  }

  public void testNotNull_equality() {
    new EqualsTester()
        .addEqualityGroup(Predicates.notNull(), Predicates.notNull())
        .addEqualityGroup(Predicates.isNull())
        .testEquals();
  }

constraints.Future.message = {item} musi być wartością przyszłą.
constraints.Max.message = {item} musi być mniejsze lub równe {value}.
constraints.Min.message = {item} musi być większe lub równe {value}.
constraints.NotNull.message = {item} jest niewypełnione.
constraints.Null.message = {item} musi być null.
constraints.Past.message = {item} musi być wartością przeszłą.
constraints.Pattern.message = {item} nie pasuje do "{regexp}".

constraints.Future.message = {item} deve ser uma data futura.
constraints.Max.message = {item} deve ser menor ou igual a {value}.
constraints.Min.message = {item} deve ser maior ou igual a {value}.
constraints.NotNull.message = {item} é obrigatório.
constraints.Null.message = {item} deve ser nulo.
constraints.Past.message = {item} deve ser uma data passada.
constraints.Pattern.message = {item} não corresponde a "{regexp}".

constraints.Future.message = {item} moet een toekomstige waarde zijn.
constraints.Max.message = {item} moet kleiner of gelijk zijn aan {value}.
constraints.Min.message = {item} moet groter of gelijk zijn aan {value}.
constraints.NotNull.message = {item} is niet ingevuld.
constraints.Null.message = {item} moet null zijn.
constraints.Past.message = {item} moet een waarde uit het verleden zijn.
constraints.Pattern.message = {item} komt niet overeen met "{regexp}".

constraints.Future.message = {item} должно быть будущим значением.
constraints.Max.message = {item} должно быть меньше или равно {value}.
constraints.Min.message = {item} должно быть больше или равно {value}.
constraints.NotNull.message = {item} обязательно.
constraints.Null.message = {item} должно быть null.
constraints.Past.message = {item} должно быть прошлым значением.
constraints.Pattern.message = {item} не соответствует "{regexp}".

constraints.Future.message = {item} भविष्य का मान होना चाहिए।
constraints.Max.message = {item} {value} से कम या बराबर होना चाहिए।
constraints.Min.message = {item} {value} से अधिक या बराबर होना चाहिए।
constraints.NotNull.message = {item} आवश्यक है।
constraints.Null.message = {item} शून्य होना चाहिए।
constraints.Past.message = {item} अतीत का मान होना चाहिए।
constraints.Pattern.message = {item} "{regexp}" से मेल नहीं खाता।