OpenJDK & What it means for the Java Developer Dalibor Topi - - PowerPoint PPT Presentation

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OpenJDK & What it means for the Java Developer Dalibor Topi - - PowerPoint PPT Presentation

May 14, 2023 296 likes •2.25k views

OpenJDK & What it means for the Java Developer Dalibor Topi Java F/OSS Ambassador Sun Microsystems http://twitter.com/robilad Dalibor.Topic@Sun.com Java 2 Programming Language 3 Virtual Machine 4 Cross- platform Programming

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OpenJDK & What it means for the Java Developer

Dalibor Topić Java F/OSS Ambassador Sun Microsystems http://twitter.com/robilad Dalibor.Topic@Sun.com

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Java

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Programming Language

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Virtual Machine

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Cross- platform Programming Environment

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Community Of Communities

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Pretty successful

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~1B LOC

  • f Open Source

Code written in it (acc. to ohloh.net)

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That's just the

visible space

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What else happened in the last 10 years?

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Open Source

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From fringe to mainstream

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Open Innovation across

  • rganizational

boundaries

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Remember shipping containers?

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Changed the world

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Radically reduced transaction costs

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For material goods

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Standardized measures

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Optimization

  • pportunities
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Open Source does the same

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For software components

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Standardized Legal Containers

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Permeable development

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Lowered barrier to participation

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Collaborative User Innovation

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What else happened?

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Linux

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From fringe to mainstream

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Cloud, Cluster, Server, Netbook, TV, Phone, ...

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Anyone can create a Linux- based software platform

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shipping yard, fleet & port in one

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Organic growth

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Cambrian explosion of Linux distros

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Selective Pressure On Development Tools on Linux Strongly Favors Open Source

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Manifests itself around: availability, integration, ease of use

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Example: sudo aptitude install openjdk-6-jdk vs. many minutes of manual work

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Example: sudo aptitude build-dep openjdk-6 vs. many hours of manual work

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Open Source

+ Java + Linux

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OpenJDK 7

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JDK 7

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Open Source

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GPL v2

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Classpath Exception

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2006: From closed to open

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First Step: Get the code

  • ut
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Putting the effort in perspective

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Mozilla 1.2M SLOCs

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Eclipse 2.2M SLOCs

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OpenJDK 3.5M SLOCs

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Done within

  • ne year
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Managing expectations

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Pessimist extremists: Java will be forked to death!

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Well, no. Didn't happen.

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Optimist extremists: I want a feature! And I want it now!

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Well, probably no. You can have a go at it yourself, though.

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Culture change

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2007: Cleaning up

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Second Step: 100 % Open Source

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Replacing encumbered third-party code

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Removing structural barriers to innovation

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Fully open source bootstrap

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IcedTea

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Gervill Sound Synthesizer

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64-Bit Plugin

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Packaging

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OpenJDK 6

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2008: Infrastructure & Adoption

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Third Step: Put it to use

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Mercurial

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External Committers

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JDK 7 mainline

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Sidestreams

  • f

development

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Feature Projects

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Like NIO2, MLVM & Jigsaw

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Making JDK & JVM suitable for more problems

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Porting Projects

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Like Zero, Shark, BSD Port

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Putting OpenJDK in more places

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Gentoo, Debian, Fedora, Ubuntu, OpenSUSE, Mandriva, Simply MEPIS, Linux Mint Red Hat Enterprise Linux, CentOS, Oracle Enterprise Linux FreeBSD, OpenBSD, NetBSD, MacPorts Poky Linux, Angstrom, OLPC XO

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Removing social barriers to innovation

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2009: JDK 7 Milestones

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Fourth step: Create more

  • pportunities

to innovate

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Code going from closed to open

  • ften has a tough

learning curve

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Private conversations

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Insider knowledge

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Easier to learn the ropes writing new code

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Public knowledge

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Searchable knowledge

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In practice: Modularize the code base

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Reducing complexity

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Removing intrinsic barriers to innovation

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Where are we now?

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Gradually growing, diverse Community

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Individual Developers

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BSD Port

Landon Fuller Greg Lewis Kurt Miller Christos Zoulas

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Academia

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Type Annotations Mahmood Ali Michael Ernst

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Corporate Contributors

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Sun, Red Hat, Google, AMD

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Total: 180 ! @Sun.com: 47

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25 Projects

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Both Incremental Innovation

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XRender Pipeline

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And Disruptive Innovation

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Dynamic language support

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Larger Community

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IcedTea

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Jalimo

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Cacao VM

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Maxine VM

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JNode OS

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IKVM.NET

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What about the language?

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Size matters

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Big changes harder then small ones

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Project Coin

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small language changes

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Strings in switch

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String s = ... switch(s) { case "foo": processFoo(s); break; }

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Improved Type Inference for Generic Instance Creation

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AKA: Diamond

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// type less: Map<String, List<String>> map = new HashMap<>();

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Language support for JSR 292

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Object x = InvokeDynamic.getMeSomething(); MethodHandle mh = ...; mh.invoke(); int #"strange variable name" = 42; System.out.println(#"strange variable name"); // prints 42

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… and more

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http://openjdk.java.net/projects/coin

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Not so small changes

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Type Annotations

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JSR 308

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Checker framework

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@NonNull

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@Nullable

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javac -processor NullnessChecker MyFile.java

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@ReadOnly

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http://openjdk.java.net/projects/type-annotations

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JSR 294

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Improved modularity support in the language

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Independent

  • f a module

system

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Explicit Dependencies + Versioning + Accessibility

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module-info.java

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src/org/openjdk/SomeTool.java src/module-info.java

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module org.openjdk.SomeTool @ 1.0 { requires module SomeLib @ 1.2; requires module AnotherLib @ 2.1; requires module jdk-swing @ 7.0; class org.openjdk.SomeTool; }

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understood by javac

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understood by java

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$CLASSPATH is dead

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Jigsaw

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modularity for the JDK

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Size matters

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well-defined subsets

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Just-enough JDK

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simple & static

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low level

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native packaging

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jpkg

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Now: deb

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Soon: RPM SVR4 IPS

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Add your format: jigsaw-dev@openjdk.dev.java.net

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http://openjdk.java.net/projects/jigsaw/

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JDK 7

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8 milestones

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M1 (finished)

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Compressed OOPs

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Garbage First Garbage Collector

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M2 (finished)

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NIO2

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URLClassLoader.close()

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M3 (finished)

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InvokeDynamic

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Stream Control Transmission Protocol

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Sockets Direct Protocol

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Unicode 5.1

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ClassLoader Architecture Update

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M4 (finished)

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Forward-port 6u10 features

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Type Annotations

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M5 (ongoing)

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Update the XML stack

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Elliptic Curve Cryptography

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Swing Updates

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Concurrency & Collections Updates

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Project Coin

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http://openjdk.java.net/projects/jdk7/

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Contribute

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http://openjdk.java.net

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Patches for JDK 7

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http://bugs.openjdk.java.net

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Stay up to date

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http://planetjdk.org

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Discuss development

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discuss@openjdk.java.net

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jdk7-dev@openjdk.java.net

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Q & A dalibor.topic@sun.com