if (rawType.equals(Predicate.class)) {
      return (Predicate<Object>) v -> (boolean) getDefaultValue(TypeToken.of(boolean.class));
    } else if (rawType.equals(IntFunction.class)) {
      try {
        Method method = IntFunction.class.getMethod("apply", int.class);
        return (IntFunction<Object>) v -> getDefaultValue(type.method(method).getReturnType());
      } catch (NoSuchMethodException e) {

            return defaultValue != null ? defaultValue.toString() : StringUtil.EMPTY;
        } catch (final Exception e) {
            return StringUtil.EMPTY;
        }
    }

    private String getDefaultMaxKey() {
        try {
            final Method method = CustomSize.class.getMethod("maxKey");
            final Object defaultValue = method.getDefaultValue();

        try {
            final Method method = UriType.class.getMethod("protocolType");
            assertNotNull(method, "protocolType method should exist");
            assertNull(method.getDefaultValue(), "protocolType should not have default value");
        } catch (final NoSuchMethodException e) {
            fail("protocolType method should exist");
        }
    }