how to split up runtime (original) (raw)

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

Matthias Klose doko at ubuntu.com
Thu Jul 12 07:58:21 UTC 2018

On 09.07.2018 20:39, Alan Bateman wrote:

On 09/07/2018 18:54, Fridrich Strba wrote:

Alan,

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.

I think it would be useful to explain in more detail what you do with JDK 9 and JDK 10. In particular, what happens if someone installs the runtime package followed by the devel package. Do you end up with one or two java runtime images on the system? The mails suggest only one, in which case I'm curious what you do with the lib/modules container.

yes, we end up with only one runtime package. I assume you could install openjdk from any Debian/Fedora/Suse/Ubuntu packages and see how this is packaged. Details may vary, but the schema should be clear.

As an alternative, have a look at the build log available from https://launchpad.net/~openjdk-r/+archive/ubuntu/ppa/+build/15097262

At the end of the log, you'll find a summary of the binary packages built from this source package, both the meta data and the included files. Currently the lib/modules container files are found in the "-dev" packages.

Matthias

-Alan

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