On Mon, 2 Dec 2024 18:25:22 GMT, Severin Gehwolf <sgehw...@openjdk.org> wrote:
> Please review this bug fix for using `jlink` when linking from the run-time
> image. For regular JDK builds which include the `jmods` folder, that path is
> automatically added as the `--module-path` when not otherwise specified on
> the command line. For JDK builds with JEP 493 enabled, the `jmods` folder
> doesn't exist and the list of module roots needs to be computed from the
> system modules. However, since `jdk.jlink` isn't allowed to be added to the
> list of output modules when linking from the run-time image, the default
> module path doesn't include `jdk.jlink` and modules depending on `jdk.jlink`,
> currently only `jdk.jpackage`. This seems a sensible default since otherwise
> linking using ALL-MODULE-PATH fails, while it works with a JDK build
> including JMODs. See the bug for details about the issue.
>
> When an explicit module path is being added, there is no difference. All
> modules on that path will be added as roots. Tests have been added for the
> same. Thoughts?
>
> Testing:
> - [x] GHA, `test/jdk/tools/jlink` (all pass)
> - [x] Added jlink test.
Such behavioral change is a good change as jlink from the default and
--generate-linkable-runtime build would have the consistent behavior. If a
module path is given with no root module (empty path), it throws the following
error. I think it can throw a similar message as if `--add-modules
ALL-MODULE-PATH` is given but no `--module-path`.
$ jlink --add-modules ALL-MODULE-PATH --output myimage --module-path emptyPath
Error: Cannot invoke "java.nio.file.Path.getFileName()" because "javaBasePath"
is null
java.lang.NullPointerException: Cannot invoke
"java.nio.file.Path.getFileName()" because "javaBasePath" is null
at
jdk.jlink/jdk.tools.jlink.internal.JlinkTask.isJavaBaseFromDefaultModulePath(JlinkTask.java:660)
at
jdk.jlink/jdk.tools.jlink.internal.JlinkTask.targetPlatform(JlinkTask.java:632)
at
jdk.jlink/jdk.tools.jlink.internal.JlinkTask.createImageProvider(JlinkTask.java:569)
at
jdk.jlink/jdk.tools.jlink.internal.JlinkTask.createImage(JlinkTask.java:410)
at jdk.jlink/jdk.tools.jlink.internal.JlinkTask.run(JlinkTask.java:285)
at jdk.jlink/jdk.tools.jlink.internal.Main.run(Main.java:56)
at jdk.jlink/jdk.tools.jlink.internal.Main.main(Main.java:34)
-------------
PR Comment: https://git.openjdk.org/jdk/pull/22494#issuecomment-2523920827
