Don't know, but try using Long instead.
In general, if I remember right, the long type requires some extra
processing due to the fact that JavaScript doesn't really support it,
so some manipulation takes place in JavaScript to make it appear that
it does.  If you can, avoid using longs in your RemoteServices.

On Mar 23, 5:09 am, snorbi <sandor.norb...@erinors.com> wrote:
> Hello,
>
> I have an RPC interface:
>
> public interface Generator extends RemoteService {
>     long generate();
>     long[] generate(int count);
>
> }
>
> I get the warning during compiling:
> [WARN] Line 14: Referencing class 'long_Array_Rank_1_FieldSerializer:
> unable to resolve class, expect subsequent failures
>
> What does this mean?
> I use gwt-1.6.1, and there was no warning until I upgraded from 1.5.3.
>
> Thanks for your help!
> Regards:
> Norbi
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