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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
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=""
TEST_IMAGE = "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:
The following OpenJDK version/target-architecture combinations currently
only support "interpreted mode":
openjdk-8 on arm except armv7
openjdk-7 on aarch64
openjdk-7 on x86
openjdk-7 on x86-64
The following target-architectures currently fail building
openjdk-7-jre, openjdk-7, openjdk-8 and openjre-8:
mips (tested with qemumips)
mips64 (tested with qemumips64)
ppc (tested with qemuppc)
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 \
"
Please note that libstdc++ static is needed on your host to compile icedtea7-native
(install libstdc++-static on a Fedora).
For debian-based distributions you need the libstdc++6-$compilerversion-dev package.
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