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From: =?UTF-8?Q?Arne_Vajh=c3=b8j?= <arne@vajhoej.dk>
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Subject: Re: Problem compiling with 9 for 8
Date: Mon, 2 Oct 2017 20:24:23 -0400
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On 10/2/2017 8:12 PM, Arne Vajhøj wrote:
> 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.

Some googling reveals that ct.sym was introduced as far
back as Java 6.

Arne