README

This layer provides support for the JVMs of the Eclipse Temurin Project for use with OpenEmbedded and/or Yocto Project build systems.

Why prebuilt binaries?

Building a JVM from source takes a long time and maintaining patches/tests is a lot of effort. Eclipse Temurin binaries are JCK-certified and proven compatible with the Java specification.

Dependencies

• git://git.openembedded.org/openembedded-core
• git://git.openembedded.org/bitbake

If you're using Poky, you're already set up—just clone the branch matching your Yocto codename.

Adding the layer

git clone -b <yocto-codename> https://github.com/lucimber/meta-openjdk-temurin.git
bitbake-layers add-layer meta-openjdk-temurin

Supported Yocto Releases

This layer supports LTS branches, and offers optional compatibility for certain adjacent releases grouped based on technical similarity, not just release sequence. The following table illustrates this using two examples:

LTS Branch	Non‑LTS Compatible Releases
Kirkstone	langdale, mickledore, nanbield
Scarthgap	styhead, walnascar

These non-LTS entries in LAYERSERIES_COMPAT_meta-openjdk-temurin are informal and untested, offered for user convenience. Support remains focused solely on LTS branches.

Benefits of this grouping:

• Minimal maintenance burden: Close alignment in BitBake/core component versions enables common patch reuse.
• Greater patch stability: Fewer divergent code paths across grouped releases.
• Clear support boundaries: Users of this layer understand which combinations are recommended vs. “use at your own risk.”
• Coherent branch structure: Each Git branch aligns with an LTS release and its compatible ecosystem.

See https://wiki.yoctoproject.org/wiki/Releases for a comprehensive list of Codenames.

Supported Java Versions

JVM / Architecture	arm	aarch64	riscv64	x64	x86
JRE 8	✅	✅	❌	✅	❌
JRE 11	✅	✅	❌	✅	❌
JRE 17	✅	✅	✅	✅	❌
JRE 21	❌	✅	✅	✅	❌

Participation & Contribution

Contributions are welcome under the included GPL - 2.0 license. By submitting a PR, you agree to the Developer Certificate of Origin:

By making a contribution to this project, I certify that:
a. The contribution was made by me under GPL-2.0 (or compatible).
b. If based on prior work, I have the right to submit it under GPL-2.0.
…
Signed-off-by: Your Name <you@example.com>

Either place Signed-off-by: ... into the last line of your commit message, or use the -s flag togther with the git commit command.

Trademarks

Eclipse Temurin is a trademark of the Eclipse Foundation. Eclipse, and the Eclipse Logo are registered trademarks of the Eclipse Foundation.

Java and all Java-based trademarks are trademarks of Oracle Corporation in the United States, other countries, or both.

License

meta-openjdk-temurin - A software layer as defined by the Yocto Project Layer Model.

Copyright (C) 2023 Lucimber UG

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

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meta - openjdk - temurin is maintained by Lucimber UG, based on work from Eclipse Temurin and the Yocto/OpenEmbedded community.