Groups > comp.lang.java.programmer > #37525

Re: Problem compiling with 9 for 8

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From	Arne Vajhøj <arne@vajhoej.dk>
Newsgroups	comp.lang.java.programmer
Subject	Re: Problem compiling with 9 for 8
Date	Mon, 2 Oct 2017 20:12:45 -0400
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On 10/2/2017 8:03 PM, Arne Vajhøj wrote:
> On 10/2/2017 7:46 PM, Arne Vajhøj wrote:
>> As I explained then I believe that --release replaces -source (that
>> set the language itself version), -target (that set the generated Java
>> byte code version) and -Xbootclasspath (that set the javart.jar used
>> and therefore the version used).
> 
> I found the documentation:
> 
> https://docs.oracle.com/javase/9/migrate/toc.htm#JSMIG-GUID-7744EF96-5899-4FB2-B34E-86D49B2E89B6 
> 
> 
> <quote>
> The --release N flag is conceptually a macro for:
> 
> -source N -target N -bootclasspath $PATH_TO_rt.jar_FOR_RELEASE_N
> </quote>

But I was wrong about the implementation.

It does not use the old rt.jar.

https://bugs.openjdk.java.net/browse/JDK-8058150

<quote>
For JDK N and --release M, M < N, signature data of the documented APIs 
of release M of the platform is needed. This data is stored in the 
$JDK_ROOT/lib/ct.sym file, which is similar, but not the same, as the 
file of the same name in JDK 8. The ct.sym file is a ZIP file containing 
stripped-down class files corresponding to class files from the target 
platform versions.
</quote>

So --release should work without the old rt.jar, but zipinfo on
ct.sym reveals that JavaFX is not included in it.

So therefore an actual old jfxrt.jar is needed.

Arne

Thread

Problem compiling with 9 for 8 Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2017-10-02 10:51 -0500
  Re: Problem compiling with 9 for 8 Arne Vajhøj <arne@vajhoej.dk> - 2017-10-02 14:25 -0400
    Re: Problem compiling with 9 for 8 Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2017-10-02 14:49 -0500
      Re: Problem compiling with 9 for 8 Arne Vajhøj <arne@vajhoej.dk> - 2017-10-02 16:10 -0400
        Re: Problem compiling with 9 for 8 Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2017-10-02 16:08 -0500
          Re: Problem compiling with 9 for 8 Arne Vajhøj <arne@vajhoej.dk> - 2017-10-02 19:46 -0400
            Re: Problem compiling with 9 for 8 Arne Vajhøj <arne@vajhoej.dk> - 2017-10-02 20:03 -0400
              Re: Problem compiling with 9 for 8 Arne Vajhøj <arne@vajhoej.dk> - 2017-10-02 20:12 -0400
                Re: Problem compiling with 9 for 8 Arne Vajhøj <arne@vajhoej.dk> - 2017-10-02 20:24 -0400
                Re: Problem compiling with 9 for 8 Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2017-10-03 10:32 -0500
                Re: Problem compiling with 9 for 8 Arne Vajhøj <arne@vajhoej.dk> - 2017-10-03 20:48 -0400
                Re: Problem compiling with 9 for 8 Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2017-10-04 17:27 -0500

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