how to split up runtime / development parts in OpenJDK 11?

Fridrich Strba fridrich.strba at
Mon Jul 9 17:54:59 UTC 2018


On 07/07/18 21:41, Alan Bateman wrote:
> JEP 220 was integrated in 2014 for JDK 9 so I'm puzzled as to why this
> is only coming up now. Did you do this splitting with JDK 9 and JDK 10?
> I can't see how this could have worked without either re-running jlink
> or else having your "jre" image including the classes/resources for all
> modules that are in the "jdk" image.

I don't think that he speaks about putting a jre in a separate directory
whatsoever. What we normally do in Linux distributions, is separate the
installation into runtime packages and devel packages. So that people
that only use java applications, but never build them, don't have to
install any of the JDK tools. In SUSE, we even split the headless
runtime bits from those that need XWindows system. For the same reason
as not to pull any X dependencies by installing only a jre that will be
used in headless context.

Now, since JEP 220, there is nothing like jre subdirectory and that is
just fine. We are installing those packages in the same prefix. In SUSE,
we did not bother about the jre images too much besides one use-case.
When I built the OpenJDK, I looked into the files in the jre image just
to know which files in the jdk image that I distribute could be
considered the jre files. This simplified my task in determining the
split. With the disappering of the jre image, there is no way now to
know what was considered by Oracle as jre files and what was condidered
as jdk-only files.

At least, this is how I understood the discussion. I might be utterly
wrong, as my wife could witness. So, if I did not get things right,
please, correct me.


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