On Thu, 6 Jul 2023 17:34:10 GMT, Severin Gehwolf <sgehw...@openjdk.org> wrote:
> Please review this patch which adds a jlink mode to the JDK which doesn't > need the packaged modules being present. A.k.a run-time image based jlink. > Fundamentally this patch adds an option to use `jlink` even though your JDK > install might not come with the packaged modules (directory `jmods`). This is > particularly useful to further reduce the size of a jlinked runtime. After > the removal of the concept of a JRE, a common distribution mechanism is still > the full JDK with all modules and packaged modules. However, packaged modules > can incur an additional size tax. For example in a container scenario it > could be useful to have a base JDK container including all modules, but > without also delivering the packaged modules. This comes at a size advantage > of `~25%`. Such a base JDK container could then be used to `jlink` > application specific runtimes, further reducing the size of the application > runtime image (App + JDK runtime; as a single image *or* separate bundles, > depending on the app b eing modularized). > > The basic design of this approach is to add a jlink plugin for tracking > non-class and non-resource files of a JDK install. I.e. files which aren't > present in the jimage (`lib/modules`). This enables producing a `JRTArchive` > class which has all the info of what constitutes the final jlinked runtime. > > Basic usage example: > > $ diff -u <(./bin/java --list-modules --limit-modules java.se) > <(../linux-x86_64-server-release/images/jdk/bin/java --list-modules > --limit-modules java.se) > $ diff -u <(./bin/java --list-modules --limit-modules jdk.jlink) > <(../linux-x86_64-server-release/images/jdk/bin/java --list-modules > --limit-modules jdk.jlink) > $ ls ../linux-x86_64-server-release/images/jdk/jmods > java.base.jmod java.net.http.jmod java.sql.rowset.jmod > jdk.crypto.ec.jmod jdk.internal.opt.jmod > jdk.jdi.jmod jdk.management.agent.jmod jdk.security.auth.jmod > java.compiler.jmod java.prefs.jmod java.transaction.xa.jmod > jdk.dynalink.jmod jdk.internal.vm.ci.jmod > jdk.jdwp.agent.jmod jdk.management.jfr.jmod jdk.security.jgss.jmod > java.datatransfer.jmod java.rmi.jmod java.xml.crypto.jmod > jdk.editpad.jmod jdk.internal.vm.compiler.jmod > jdk.jfr.jmod jdk.management.jmod jdk.unsupported.desktop.jmod > java.desktop.jmod java.scripting.jmod java.xml.jmod > jdk.hotspot.agent.jmod jdk.internal.vm.compiler.manage... This pull request has now been integrated. Changeset: 2ec35808 Author: Severin Gehwolf <sgehw...@openjdk.org> URL: https://git.openjdk.org/jdk/commit/2ec358082f0896480bdbfcb289b4ba2bff0dd828 Stats: 4315 lines in 47 files changed: 4065 ins; 146 del; 104 mod 8311302: Implement JEP 493: Linking Run-Time Images without JMODs Co-authored-by: Mandy Chung <mch...@openjdk.org> Reviewed-by: mchung, alanb, erikj, ihse ------------- PR: https://git.openjdk.org/jdk/pull/14787
