[jira] [Commented] (MATH-1455) mvn tests fail if JDK 9 is used

["Gilles (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MATH-1455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16421290#comment-16421290 ] 

Gilles commented on MATH-1455:
------------------------------

I was aware of that, but I didn't how to deal with it other than disabling the test, which will only hide the issue that {{FastMath}} is not a "drop-in" replacement of {{Math}} as the documentation states.

The alternative of implementing the missing methods gets us back to never addressed issues:
 * MATH-740
 * MATH-901
 * MATH-1113

AFAICT, the primary purpose of the (initial) {{FastMath}} code was accuracy. As it happens, several methods were also faster, but, as the above reports showed, the name was a bad choice.

First step would be to post to the "dev" ML, to see whether someone else agrees there is a fundamental issue, and is interested to fix it.

> mvn tests fail if JDK 9 is used
> -------------------------------
>
>                 Key: MATH-1455
>                 URL: https://issues.apache.org/jira/browse/MATH-1455
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 4.X
>            Reporter: Mark Williamson
>            Priority: Minor
>
> This is essentially the JDK9 version of MATH-1156
> {code:java}
> // code 
> Running org.apache.commons.math4.util.FastMathTest
> FastMath does not implement: public static long java.lang.StrictMath.multiplyExact(long,int)
> FastMath does not implement: public static double java.lang.StrictMath.fma(double,double,double)
> FastMath does not implement: public static float java.lang.StrictMath.fma(float,float,float)
> FastMath does not implement: public static long java.lang.StrictMath.multiplyFull(int,int)
> FastMath does not implement: public static long java.lang.StrictMath.multiplyHigh(long,long)
> FastMath does not implement: public static long java.lang.StrictMath.floorDiv(long,int)
> FastMath does not implement: public static int java.lang.StrictMath.floorMod(long,int)
> {code}



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