On Wed, 9 Jun 2021 at 19:58, Alex Herbert <alex.d.herb...@gmail.com> wrote:
>
> On Wed, 9 Jun 2021 at 17:56, sebb <seb...@gmail.com> wrote:
>
> > On Wed, 9 Jun 2021 at 17:26, Alex Herbert <alex.d.herb...@gmail.com>
> > wrote:
> > >
> > > On Wed, 9 Jun 2021 at 17:03, John Patrick <nhoj.patr...@gmail.com>
> > wrote:
> > >
> > > > Have you tried "9" instead of "1.9"?
> > > >
> > >
> > > I've corrected that in the pom, thanks.
> > >
> > > I think the issue is that Gilles used JDK 8 to try and build it. You can
> > > run using the project's main artifacts using JDK 8, but the build now
> > > requires JDK 9 for the tests and JMH performance tests.
> >
> > That seems wrong. If the code targets Java 8, it must be possible to
> > test it using Java 8.
> >
> > It's possibly OK to require JDK 9 for performance tests.
> >
>
> The test is using JDK 9 for the BigDecimal sqrt method. This is used to
> compute the exact answer for a Euclidean norm on random input. Since the
> input is random the answers cannot be hard-coded into the test. So this
> test is not possible on JDK 8. The alternative is if the exact computation
> is done using BigDecimal, converted to double, and then a sqrt computed. We
> could change to that instead if there are strong objections here against
> java 9.

I certainly object.

>
> The issue with requiring a higher JDK than the target is similar to using
> JDK 8 so that JUnit 5 can be used for the test suite to test code that
> targets a level lower than 1.8.

IMO that would be wrong as well.

Someone wanting to use the source on its minimum supported version
must be able to run the tests using that same version.

> Alex

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