@Override
      public void onOpen(@NotNull EventSource eventSource, @NotNull Response response) {
        try {
          assertEquals("text/event-stream", response.request().header("Accept"));
        } catch (Exception e) {
          future.completeExceptionally(e);
        }
      }

      @Override

  }

  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();
  }

        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);

          <item index="5" class="java.lang.String" itemvalue="io.reactivex.annotations.NonNull" />
          <item index="6" class="java.lang.String" itemvalue="io.reactivex.rxjava3.annotations.NonNull" />
          <item index="7" class="java.lang.String" itemvalue="jakarta.annotation.Nonnull" />
          <item index="8" class="java.lang.String" itemvalue="javax.annotation.Nonnull" />

        return "Predicates.isNull()";
      }
    },
    /**
     * @see Predicates#notNull()
     */
    NOT_NULL {
      @Override
      public boolean apply(@Nullable Object o) {
        return o != null;
      }

      @Override
      public String toString() {
        return "Predicates.notNull()";
      }
    };

    @SuppressWarnings("unchecked") // safe contravariant cast

		AutoIncrement:          utils.CheckTruth(tagSetting["AUTOINCREMENT"]),
		HasDefaultValue:        utils.CheckTruth(tagSetting["AUTOINCREMENT"]),
		NotNull:                utils.CheckTruth(tagSetting["NOT NULL"], tagSetting["NOTNULL"]),
		Unique:                 utils.CheckTruth(tagSetting["UNIQUE"]),
		Comment:                tagSetting["COMMENT"],
		AutoIncrementIncrement: DefaultAutoIncrementIncrement,
	}

		} else {
			tests.AssertObjEqual(t, parsedField, f, "Name", "DBName", "BindNames", "DataType", "PrimaryKey", "AutoIncrement", "Creatable", "Updatable", "Readable", "HasDefaultValue", "DefaultValue", "NotNull", "Unique", "Comment", "Size", "Precision", "TagSettings")

			if f.DBName != "" {
				if field, ok := s.FieldsByDBName[f.DBName]; !ok || parsedField != field {

        assertEquals("{constraints.Max.message}", FessMessages.CONSTRAINTS_Max_MESSAGE);
        assertEquals("{constraints.Min.message}", FessMessages.CONSTRAINTS_Min_MESSAGE);
        assertEquals("{constraints.NotNull.message}", FessMessages.CONSTRAINTS_NotNull_MESSAGE);
        assertEquals("{constraints.Null.message}", FessMessages.CONSTRAINTS_Null_MESSAGE);
        assertEquals("{constraints.Past.message}", FessMessages.CONSTRAINTS_Past_MESSAGE);

      Map<Class<? extends @NonNull B>, B> backingMap) {
    return new MutableClassToInstanceMap<>(backingMap);
  }

  private final Map<Class<? extends @NonNull B>, B> delegate;

  private MutableClassToInstanceMap(Map<Class<? extends @NonNull B>, B> delegate) {
    this.delegate = checkNotNull(delegate);
  }

  @Override
  protected Map<Class<? extends @NonNull B>, B> delegate() {
    return delegate;
  }

     *         {@code null}.
     */
    @Nonnull
    String getModelId();

    /**
     * Gets the applicable maven version/validation level of this problem
     * @return The version, never {@code null}.
     */
    @Nonnull
    Version getVersion();