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From: Knute Johnson <nospam@rabbitbrush.frazmtn.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: Problem compiling with 9 for 8
Date: Mon, 2 Oct 2017 16:08:48 -0500
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On 10/2/2017 15:10, Arne Vajhøj wrote:
> Yes. But does it work?

Yes it does.

I guess I shouldn't read the docs because they say:

--release release

     Compiles against the public, supported and documented API for a 
specific VM version. Supported release targets are 6, 7, 8, and 9.

     Note:

     When using --release for a version of the Java Platform that 
supports modules, you can’t use --add-modules to access internal JDK 
modules, nor can you use --add-exports to access internal JDK APIs in 
the modules.

And with no further information supplied that implies to me that you 
don't need to have JDK 8 installed (or parts of it) to get it to compile.

-- 

Knute Johnson