private static List<Boolean> parametersNullabilityOf(CtBehavior behavior) {
        def annotations = behavior.parameterAnnotations as List<Object[]>
        annotations.collect { Object[] pAnn ->
            pAnn.flatten().any { isNullableCtAnnotation(it) }
        }
    }

    private static boolean hasNullableAnnotation(CtField field) {
        return NULLABLE_ANNOTATIONS.any { field.hasAnnotation(it) }
    }