[bv-dev] Container element validation for arrays

Matt Benson mbenson at apache.org
Wed Apr 19 11:38:02 EDT 2017

My understanding was that using:

@Size(2) String[] arrayOfTwoStrings;

was basically "wrong" according to the new annotation semantics. Rather
you'd have:

@Size(2) String[] arrayOfTwoCharacterCodes;
String @Size(2) [] arrayOfTwoStrings;

The "nuclear" option is to adopt this wholeheartedly in BV 2.0. We could
additionally support a "compatibility mode" that, if enabled, would
preserve the BV 1.x constrained array semantics, with no Java-based option
to validate each element  (as the appropriate constraint position has been
hijacked). Alternatively, a given BV implementation could support a special
mode to turn on the "new" behavior, but that would probably be much more
messy for re-unifying the specification and implementations in the future.


On Wed, Apr 19, 2017 at 10:09 AM, Michael Nascimento <misterm at gmail.com>

> On Wed, Apr 19, 2017 at 12:03 PM, Gunnar Morling <gunnar at hibernate.org>
> wrote:
>> Then we cannot tell what's the target of the @Size annotation, String
>> or String[]. As per Java 8's annotation semantics it can be both
>> (provided FIELD and TYPE_USE are among the supported element types).
> This point worries me. So you're saying there's a flaw in *the language
> design* for this JSR in this particular case, is that right? I said it
> before, but since now we got to a point you''re stating (maybe rightfully,
> don't take me wrong!) the language is broken in the specific case of
> annotations involving arrays, it would be nice to contact the spec leads
> for the JSR in order to see (a) if we missed something (then we should
> revisit the solution) or (b) to get the language fixed for Java SE 10 (for
> 9 I think it wouldn't make it even though it's a bug fix) and in this case
> provide no support until we release BV for that version of Java.
> Regards,
> Michael
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