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OpenEmbedded/Yocto Project layer for Java support
=================================================
This layer provides support for Java for use with OpenEmbedded and/or
Yocto Project build systems.
This layer depends on:
URI: git://git.openembedded.org/openembedded-core
branch: master
revision: HEAD
URI: git://git.openembedded.org/meta-openembedded
sub-layer: meta-oe
branch: master
revision: HEAD
Furthermoe for oeqa runtime testing this layer depends on:
URI: git://git.yoctoproject.org/poky
sub-layer: meta-poky
branch: master
revision: HEAD
For use with a specific Yocto Project release please refer to the corresponding
git branches.
Contributing
------------
To contribute to this layer you should submit the patches for review to the
mailing list (openembedded-devel@lists.openembedded.org).
Please refer to:
https://wiki.yoctoproject.org/wiki/Contribution_Guidelines#General_Information
for some useful guidelines to be followed when submitting patches.
Mailing list:
http://lists.openembedded.org/mailman/listinfo/openembedded-devel
Source code:
git://git.yoctoproject.org/meta-java
http://git.yoctoproject.org/git/meta-java
When creating single patches, please use something like:
git format-patch -M -s --subject-prefix='meta-java][PATCH' -1
When creating a patch series, please add a cover letter describing it shortly.
Therefore use something like:
git format-patch -M -s --cover-letter --subject-prefix='meta-java][PATCH' origin
When sending patches, please use something like:
git send-email --to openembedded-devel@lists.openembedded.org <generated patch(es)>
Main layer maintainers:
Henning Heinold <henning@itconsulting-heinold.de>
Maxin John <maxin.john@intel.com>
Otavio Salvador <otavio@ossystems.com.br>
Richard Leitner <richard.leitner@skidata.com>
Testing
-------
The meta-java layer may be tested using oeqa's runtime image tests. The easiest
way is to add the following configuration to your local.conf:
SANITY_TESTED_DISTROS = ""
INHERIT += "testimage"
TESTIMAGE_AUTO = "1"
Then you should be able to use the open{jre,jdk}-{7,8}-test-image recipes.
Furthermore you could also include the tests provided in lib/oeqa/runtime/cases
into your test image. More information on image testing is available at:
https://wiki.yoctoproject.org/wiki/Image_tests
Known Limitations/Bugs
----------------------
+ OpenJDK-7 doesn't support musl based images
+ Both, OpenJDK-7 and 8 doesn't support mips and mips64 machines
+ Further limitations are shown in the OpenJDK version/libc/target architecture
support matrix below:
+--------+-----------------+-----------------+-----------------+
| | OpenJDK-7/glibc | OpenJDK-8/glibc | OpenJDK-8/musl |
+--------+-----------------+-----------------+-----------------+
| arm | O K | int. mode | int. mode |
+--------+-----------------+-----------------+-----------------+
| armv7 | O K | O K | O K |
+--------+-----------------+-----------------+-----------------+
| arm64 | int. mode | O K | O K |
+--------+-----------------+-----------------+-----------------+
| x86 | int. mode | O K | build failure |
+--------+-----------------+-----------------+-----------------+
| x86-64 | int. mode | O K | O K |
+--------+-----------------+-----------------+-----------------+
| ppc | int. mode | build failure | build failure |
+--------+-----------------+-----------------+-----------------+
If you encounter any other problems or bugs please report them to our mailing
list at openembedded-devel@lists.openembedded.org.
Usage instructions
------------------
You should define at least the following variables in a distro include file or local.conf
# Possible provider: cacao-initial-native and jamvm-initial-native
PREFERRED_PROVIDER_virtual/java-initial-native = "cacao-initial-native"
# Possible provider: cacao-native and jamvm-native
PREFERRED_PROVIDER_virtual/java-native = "jamvm-native"
# Optional since there is only one provider for now
PREFERRED_PROVIDER_virtual/javac-native = "ecj-bootstrap-native"
Simply rely on openjdk-7-jre, openjdk-7, openjdk-8 or openjre-8.
For conf/bblayers.conf you have to add
BBLAYERS ?= " \
...
path_to_source/meta-openembedded/meta-oe \
path_to_source/sources/meta-java \
"
Build host dependencies
-----------------------
- gcc >= v6
- libstdc++ static
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