Where do modules go in jlink images?

[Gunnar Morling]

Hi Nicolai,

Funny, I was just exploring the related code the other day. If you are
interested, look for usage of
jdk.tools.jlink.internal.BasicImageWriter.MODULES_IMAGE_NAME, this will get
you to the code for writing the "modules" file.

--Gunnar


2018-01-08 21:06 GMT+01:00 Nicolai Parlog <nipa at codefx.org>:

>  Hi Alan,
>
> my mistake was to assume that the JMOD files contain the bytecode that
> the JVM is running. A look into a JRE image would have saved me from that.
>
>  so long ... Nicolai
>
>
>
> On 07.01.2018 18:51, Alan Bateman wrote:
> > On 07/01/2018 12:57, Nicolai Parlog wrote:
> >>   Hi!
> >>
> >> Another question about jlink (guess what chapter I'm working on ;) ).
> >> I've tried to find out where jlink puts the content of the jmods
> >> folder, but hit a wall.
> >>
> >> I created a full runtime image with jlink and diffed the file trees
> >> (including disk usage), but all that got me was that my image doesn't
> >> contain bin/jmc, jmods, lib/misssioncontrol, lib/src.zip, and
> >> lib/plugin-legacy.jar - all of that is expected, but where are the
> >> class files from the jmod archives?
> >>
> >> Now I wonder, whether these are just ornamental - does lib/modules
> >> contain all the bytecode? I'm confused.
> >>
> > JEP 220 describes the layout of the run-time image and may help. Many
> > modules will only contain classes and resources, they will go the jimage
> > container (the internal "modules" file) as Rémi said. Many of the JDK
> > modules have launchers (the jdk.compiler module has the javac launcher
> > for example), native library, configuration files, legal notices, man
> > pages, ...  The jlink tool puts these in the locations listed in the JEP.
> >
> > -Alan
> >
>
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