OpenJDK The Future of Open Source Java on GNU/Linux Dalibor Topi - - PowerPoint PPT Presentation

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OpenJDK The Future of Open Source Java on GNU/Linux Dalibor Topi - - PowerPoint PPT Presentation

Jun 02, 2023 254 likes •661 views

OpenJDK The Future of Open Source Java on GNU/Linux Dalibor Topi Java F/OSS Ambassador Blog aggregated on http://planetjdk.org Java Implementations Become Open Source Java ME, Java SE, and Java EE 2 Why now? Java is everywhere

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OpenJDK – The Future

  • f Open Source Java
  • n GNU/Linux

Dalibor Topić Java F/OSS Ambassador Blog aggregated on http://planetjdk.org

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Java ME, Java SE, and Java EE

Java Implementations Become Open Source

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Why now?

Innovation Maturity Adoption

Java is everywhere F/OSS growing globally Faster progress through participation

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Why GNU/Linux?

Demand Values Stack

Freedom as a core value Free Software above and below the JVM Increasing demand for Java integration

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Who profits?

Sun

Developers Customers

New markets, new possibilities More innovations, reduced risk Mindshare, anchoring Java in GNU/Linux

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License

+ Classpath Exception

(for SE, EE)

  • Programs can have

any license

  • Improvements

remain in the community

  • FSFs license for GNU

Classpath

GPL v2

  • No proprietary forks
  • Popular & trusted

license

  • Compatible with

GNU/Linux

  • Fostering adoption
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Jun 1996: Work on gcj starts Nov 1996: Work on Kaffe starts Feb 1998: First GNU Classpath Release Mar 2000: GNU Classpath and libgcj merge Dec 2002: Eclipse runs on gcj/Classpath Oct 2003: Kaffe switches to GNU Classpath Feb 2004: First FOSDEM Java Libre track Apr 2004: Richard Stallman on the 'Java Trap' Jan 2005: OpenOffice.org runs on gcj Mai 2005: Work on Harmony starts

A Little Bit Of History

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Juni 2005: Java EE RI Glassfish goes Open Source Mai 2006: First Glassfish release Mai 2006: Java announced to go Open Source November 2006: Java ME RI PhoneME goes Open Source November 2006: Java SE RI Hotspot und Javac go Open Source Mai 2007: The rest of Java SE follows suit

Sun & Open Source Java RIs

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Status: JavaOne, Mai 2007

OpenJDK can be fully built from source, 'mostly' Open Source

25,169 Source code files 894 (4%) Binary files (“plugs”) 1,885 (8%) Open Source, though not GPLv2 The rest is GPLv2 (+ CP exception) Sun couldn't release the 4% back then as free software. “Encumbrancies”

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Encumbrancies (2007)

Font rasterizer Graphics rasterizer Sound engine Crypto providers Some SNMP code Imaging APIs

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Status 2008: Fixed Encumbrancies

Font rasterizer Font rasterizer Graphics rasterizer Graphics rasterizer Sound engine Sound engine Crypto providers Crypto providers Imaging APIs Imaging APIs

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Leftover Encumbrancies (2008)

Some SNMP code Some SNMP code (Any volunteers?) (Any volunteers?)

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Contributing

  • Sign the SCA (See http://sca.dev.java.net for FAQ)
  • Pick an issue from the bugtracker (Currently

http://bugs.sun.com)

  • Or pick a project to contribute to
  • Or send us your patches for OpenJDK
  • Or start a new project with your idea
  • Pick the right mailing list from your project's web site
  • If in doubt: discuss@openjdk.java.net
  • IRC: #openjdk on irc.oftc.net
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8 May 2007, 9:29am PDT

OpenJDK source code published

Gentoo OpenJDK ebuild Fedora source RPM

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8 May 2007, 9:29am PDT 8 May 2007, 2:46pm PDT

OpenJDK source code published Gentoo OpenJDK ebuild Fedora source RPM

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8 May 2007, 9:29am PDT 8 May 2007, 2:46pm PDT 9 May 2007, 3:06am PDT

Quelltext des JDK publiziert Gentoo OpenJDK ebuild Fedora source RPM

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IcedTea icedtea.classpath.org

7 Juni 2007

“We intend this build repository, based on OpenJDK, to provide a basis on which to experiment. It’s not a fork from OpenJDK, and doesn’t contain the OpenJDK source code.” — Andrew Haley

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9 August 2007

OpenJDK Community TCK License

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OpenJDK Community TCK License

For 'substantially derived' implementations Have to be distributed under GPLv2 Gratis access to the TCK Compatible implementations may use the “Java Compatible” brand under a separate trade mark license agreement

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OpenJDK Community TCK License

For testing compatibility to Java SE 6 TCK is not Open Source Licensees may help each other But the test code is confidential No claims of relative compatibility (x %, etc.)

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OpenJDK Community TCK License

  • Apply at the Conformance Group's

website in OpenJDK for access

  • Sign the OpenJDK CTLA
  • Get access to the TCK
  • Set the TCK up (the official docs are
  • nline, as well as Red Hat's)
  • Feedback and Support:

Conformance Group

  • OpenJDK Java Compatible

Trademark License

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OpenJDK Community TCK License

  • Red Hat & several others
  • Initial setup took Red Hat 3 months
  • Status: passing all the tests on x86/

x86_64 on Fedora

  • Published a 'JDK distilled' document
  • Cut setup time to days
  • Red Hat's patches are continously

going back to OpenJDK

  • So that other distributions can

follow suit

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Regression Tests

  • Part of OpenJDK
  • Getting published as well
  • Test tools are Open Source, too
  • Jtharness seit 2007
  • Jtreg seit 2008
  • Included in GNU/Linux distribution

builds in IcedTea

  • Build logs bei Ubuntu & Fedora
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New source code management system: Mercurial Allow us to have external committers 12/4/07: Read-only repositories 2/27/08: Read/write repositories April 2008: First external committers ~20 now

December 2007

http://hg.openjdk.java.net http://selenic.com/mercurial

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January 2008

  • OpenJDK Community Innovator's Challenge

> Up to $175,000 for up to 7 projects > Proposals were due until mid-March > Projects ran until beginning of August > Lone developers as well as teams > Proposals accepted in selected areas:

> API, Java language or OpenJDK Implementation improvements > Replacing encumbered code > Ports to new platfoms > Academia

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March 2008: Innovator's Challenge

  • Closures for Java - Neal Gafter
  • Implement XRender pipeline for Java2D - Clemens

Eisserer

  • Provide date and time library from JSR-310 - Stephen

Colebourne, Michael Nascimento Santos

  • Portable GUI backends (Caciocavallo) - Roman Kennke,

Mario Torre

  • Virtual Machine Interface - Andrew John Hughes
  • Free Software synthesizer implemention for OpenJDK -

Karl Helgason

  • OpenJDK on Windows - Ted Neward
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October 2008: Challenge Results

  • Gold (USD 75k): Implement XRender pipeline for

Java2D - Clemens Eisserer

  • Silver (USD 50k): Closures for Java - Neal Gafter
  • Bronze (USD 25k): Provide date and time library from

JSR-310 - Stephen Colebourne, Michael Nascimento Santos

  • Bronze (USD 25k): Portable GUI backends

(Caciocavallo) - Roman Kennke, Mario Torre

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February 2008

Developer's Guide: http://openjdk.java.net/guide

OpenJDK 6

FOSDEM 2008 and Java Libre Devroom

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OpenJDK 6

  • Only Free Software – No encumbered code
  • Stable – Support by the GNU/Linux distributions

> Patched for security, compatibility and ugly issues > Remove/replace non-free code in OpenJDK > Better Java Integration with GNU/Linux distributions

  • Compatibility – getting very close

> A handful of failures left to verify as fixed for b13

  • Quality – close to Java SE 6, tested using

applications like NetBeans, GlassFish, Tomcat

jdk6-dev@openjdk.java.net

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New Groups and Projects

  • Groups

> Porters > Conformance

  • Projects

> Type annotations, Compiler Grammar > Multi-language VM > JDK 6 > VisualVM > BSD port, Haiku port, MIPS port, Zero > Modules > Closures

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OpenJDK in GNU/Linux

  • Requirements

>Only Free Software >(Mostly) complete >Packaging done right >Tested and accepted by distros

Goal: Get into (main) distribution repositories ... step by step.

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What's next?

  • OpenJDK as the foundation for
  • ther code to follow

>NetBeans >GlassFish >Available in Ubuntu since

version 8.04

>Your open source project?

Goal: allow Java developers to be as

productive on Linux out of the box as everyone else is

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Improving the infrastructure Code Reviews, Wiki, Opengrok, Bugzilla Externalize processes & tools Replace the SNMP code Deployment Code (plugin, webstart) Grow the Community: Ports, Committers, Projects Governance

2008-2009

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The Java Community Process stays

Code APIs Specs OpenJDK, GlassFish, Mobile&Embedded

Community

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OpenJDK allows expert groups to develop Reference implementations for JSRs (Destined for Java SE 6+X) In the open, transparently with their users JSR 277 (Modulsystem), JSR 292 (MLVM, Invokedynamic), JSR for new NIO APIs, JSR 308 (Annotations on types)

OpenJDK has a positive effect

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Java is becoming a piece of GNU/Linux Part of the Linux toolchain JVM as a core component of distributions Full, Free Java Stack Packages for commonly used libraries 'apt-get install' for Java applications ... it's there, and it just works

Into the Future

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Thanks!

http://OpenJDK.java.net

dalibor.topic@sun.com irc://irc.oftc.net/#openjdk