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    README.md

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    Alibaba Dragonwell8 User Guide

    Alibaba Dragonwell8 Release Notes

    Introduction

    Over the years, Java has proliferated in Alibaba. Many applications are written in Java and many our Java developers have written more than one billion lines of Java code.

    Alibaba Dragonwell, as a downstream version of OpenJDK, is the in-house OpenJDK implementation at Alibaba optimized for online e-commerce, financial, logistics applications running on 100,000+ servers. Alibaba Dragonwell is the engine that runs these distributed Java applications in extreme scaling.

    Alibaba Dragonwell is certified as compatible with the Java SE standard. The current release supports Linux/x86_64 platform only.

    Alibaba Dragonwell is clearly a "friendly fork" under the same licensing terms as the upstream OpenJDK project. Alibaba is committed to collaborate closely with OpenJDK community and intends to bring as many customized features as possible from Alibaba Dragonwell to the upstream.

    Using Alibaba Dragonwell

    Alibaba Dragonwell JDK currently supports Linux/x86_64 platform only.

    Installation

    Option 1, Download and install pre-built Alibaba Dragonwell
    Option 2, Install via YUM

    Alibaba Dragonwell is officially supported and maintained in Alibaba Cloud Linux 2 (Aliyun Linux 2) YUM repository, and this repo should be also compatible with Aliyun Linux 17.1, Red Hat Enterprise Linux 7 and CentOS 7.

    • For users running Alibaba Cloud Linux 2 OS, you should be able to install Alibaba Dragonwell by simply running: sudo yum install -y java-1.8.0-alibaba-dragonwell;
    • For users running with aforementioned compatible distros, place a new repository file under /etc/yum.repos.d (e.g.: /etc/repos.d/alinux-plus.repo) with contents as follows, then you should be able to install Alibaba Dragonwell by executing: sudo yum install -y java-1.8.0-alibaba-dragonwell:
    # plus packages provided by Aliyun Linux dev team
    [plus]
    name=AliYun-2.1903 - Plus - mirrors.aliyun.com
    baseurl=http://mirrors.aliyun.com/alinux/2.1903/plus/$basearch/
    gpgcheck=1
    gpgkey=http://mirrors.aliyun.com/alinux/RPM-GPG-KEY-ALIYUN

    Enable Alibaba Dragonwell for Java applications

    To enable Alibaba Dragonwell JDK for your application, simply set JAVA_HOME to point to the installation directory of Alibaba Dragonwell. If you installed Dragonwell JDK via YUM, follow the instructions prompted from post-install outputs, e.g.:

    =======================================================================
    Alibaba Dragonwell is installed to:
        /opt/alibaba/java-1.8.0-alibaba-dragonwell-8.0.0.212.b04-1.al7
    You can set Alibaba Dragonwell as default JDK by exporting the
    following ENV VARs:
    $ export JAVA_HOME=/opt/alibaba/java-1.8.0-alibaba-dragonwell-8.0.0.212.b04-1.al7
    $ export PATH=${JAVA_HOME}/bin:$PATH
    =======================================================================

    Acknowledgement

    Special thanks to those who have made contributions to Alibaba's internal JDK builds.

    Publications

    Technologies included in Alibaba Dragonwell have been published in following papers

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