zafena development

August 28, 2012

Last week I stumbled across and dipped my toes into, Avian, a new small and fast JVM that included a JIT for ARM.
Avian have been developed in the open during the last 5 years, I was quite surprised that all this was for me unheard of!
Avian got support to be used in combination with the OpenJDK 7 class library’s: http://oss.readytalk.com/avian/building.html

Build instructions to build Avian on a Raspberry Pi running Raspbian.
sudo apt-get install openjdk-7-jdk libz-dev git

# you may change these two export to match your system
# use i386, x86_64, armhf, armel or ppc here
export ARCH=armhf
# use i386, x86_64, ppc or arm here
export JVM_ARCH=arm

# clone and build avian in combination with one existing OpenJDK 7 jdk image
# It takes about 40 minutes to perform this compilation natively on a Raspberry Pi.
git clone https://github.com/ReadyTalk/avian.git
cd avian
JAVA_HOME=/usr/lib/jvm/java-7-openjdk-${ARCH} make openjdk=/usr/lib/jvm/java-7-openjdk-${ARCH}

# Run the avian test suite to check that your newly built avian pass all expected functionality
JAVA_HOME=/usr/lib/jvm/java-7-openjdk-armhf/ make openjdk=/usr/lib/jvm/java-7-openjdk-armhf/ test

# Install the built avian libjvm.so into OpenJDK 7
sudo mkdir -p /usr/lib/jvm/java-7-openjdk-${ARCH}/jre/lib/${JVM_ARCH}/avian
sudo cp build/linux-${JVM_ARCH}-openjdk/libjvm.so /usr/lib/jvm/java-7-openjdk-${ARCH}/jre/lib/${JVM_ARCH}/avian
# Add -avian KNOWN to the end of the jvm.cfg file in order to make java -avian work
sudo sh -c "echo '-avian KNOWN' >> /usr/lib/jvm/java-7-openjdk-${ARCH}/jre/lib/${JVM_ARCH}/jvm.cfg"

# hack for ubuntu and debian to let openjdk libjava.so find the libjvm.so
sudo ln -s /usr/lib/jvm/java-7-openjdk-${ARCH}/jre/lib/${JVM_ARCH}/avian/libjvm.so /usr/lib/jvm/java-7-openjdk-${ARCH}/jre/lib/${JVM_ARCH}/libjvm.so
# the hack/workaround is required if you see the following error when running java -avian -version
# Error: Could not create the Java Virtual Machine.
# Error: A fatal exception has occurred. Program will exit.
# The above hack is not required if you compile your own build of IcedTea or OpenJDK from upstream source directly

# Done now try run it
java -avian -version
# The output to be seen
java version "1.7.0_03"
OpenJDK Runtime Environment (IcedTea7 2.1.1) (7~u3-2.1.1-1+rpi1)
Avian (build null, null)

Avian is heavily tested by its main developers for use running Eclipse SWT applications,
users of Avian have only had working Swing and AWT running during this last month.
expect Java2D to still be a little shaky when using Avian, I expect these Java2D issues to stabilize quickly thanks to the rapid development cycle that takes pace on git hub and thanks to the internal Avian test-suite that gets run after each build.

Avian got some interesting properties:
The JIT is good, it runs at a speed similar to CACAO JIT and the Thumb 2 JIT add-on for Zero.
It is embeddable, you may use Avian to create a small standalone executable that include both the JVM and your application, Avian then uses proguard to cut out and bundle only the needed code from the large OpenJDK class library that is required to run your application, all documented in the avian build documentation. This embeddable feature would possibly allow, free and open-source, OpenJDK applications to be deployed inside walled gardens such as mobile platform application stores, some people even got it to run on webOS. Avian makes Java viable on low footprint embedded systems, a generated standalone executable can be compressed to less than 1Mb!

3 Comments »

  1. [...] Chick I recently came across Avian http://oss.readytalk.com/avian/i...,from this post http://labb.zafena.se/?p=630Avian which is a very small JVM, the example code shown Application with Avian + SWT embeeded for [...]

    Pingback by Java (programming language): Is there small footprint but high performance Java VM in open source? - Quora — September 1, 2012 @ 08:29

  2. I have commited a real fix for the following:
    java -avian -version
    # Error: Could not create the Java Virtual Machine.
    # Error: A fatal exception has occurred. Program will exit.

    https://github.com/xranby/avian/commit/d88a33329aabd68b25b510e0c02fd4bccbdf434d

    Cheers
    Xerxes

    Comment by Xerxes Rånby — September 5, 2012 @ 10:09

  3. We've been playing with Avian for jMonkeyEngine for quite some time now as well. It has matured a lot since we first had eyes on it. There is now a whole lot of progress going on towards getting jMonkeyEngine 3 running on iOS:
    http://jmonkeyengine.org/groups/jmonkeyplatform/forum/topic/sneak-peek-of-the-next-big-jme3-addition/

    (Oh and we're collaborating with Julien to get jME3 working with JOGL2 as well)

    Comment by Erlend Sogge Heggen — October 27, 2012 @ 00:03

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