typeof Long is not 'number' anymore

[João Paulo Varandas]

Joerg/Emilian.

This is a questioning we've raised some time ago.
I still cannot upgrade from revision 91 because of the side effects of this
change ...

It seems that we need some wrapping/unwrapping when working with 'Long's in
Nashorn, I don't like this either, but it seems that there's a gap between
Long, Double and JSNumber max values which was bringing a loss of precision
with long values in Nashorn. Thus, Long is now "object" ...

Check out:
http://mail.openjdk.java.net/pipermail/nashorn-dev/2016-August/006450.html




*João Paulo Varandas*+55 11 99889-2321
joaovarandas at inpaas.com


2016-10-12 12:11 GMT-03:00 Emilian Bold <emilian.bold at gmail.com>:

> I just read a few of the bugs linked and it does seem worrisome. So,
> Nashorn cannot reliably be used as a glue between Java code that uses
> longs?
>
>
> --emi
>
> On Wed, Oct 12, 2016 at 5:10 PM, Frantzius, Jörg <
> Joerg.Frantzius at aperto.com
> > wrote:
>
> > Hi,
> >
> > as of JDK 1.8.0_101, the following JUnit test fails:
> >
> >     @Test
> >     public void testLongIsNumber() {
> >         jdk.nashorn.api.scripting.ScriptObjectMirror isNumberFunction =
> > eval("function isNumber(arg) {\n" +
> >             "    return typeof arg === 'number';\n" +
> >             "}\n" +
> >             "");
> >         Object result = isNumberFunction.call(isNumberFunction, 1L);
> >         assertTrue((boolean) result);
> >     }
> >
> > This breaks e.g. Nodyn, where Long numbers resulting from
> > java.io.File.length() are passed into https://nodejs.org/api/util.
> > html#util_util_isnumber_object , resulting in some „if" clause now taking
> > the wrong turn. I guess this is a side-effect of
> > https://bugs.openjdk.java.net/browse/JDK-8144020 .
> >
> > While I’m probably able to patch this in Nodyn, I find it a bit
> > frightening that any other code out there that relies on Longs being
> typeof
> > ‚number‘ will break now, in particular because there is a lot of JDK API
> > that returns Long...
> >
> > Regards,
> > Jörg
> >
> >
> > ---
> >
> > Dipl. Inf. Jörg von Frantzius, Technical Director
> >
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> >
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>

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