in src/main/java/org/apache/fineract/cn/lang/validation/CheckIdentifiers.java [42:47]
public boolean isValid(final List<String> value, final ConstraintValidatorContext context) {
if (optional && value == null)
return true;
return value != null && value.stream().allMatch(x -> x != null && CheckIdentifier.validate(x, maximumLength));
}