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Openjdk & What It Means for the Java Developer

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Openjdk & What It Means for the Java Developer OpenJDK & What it means for the Java Developer Dalibor Topić Java F/OSS Ambassador Sun Microsystems http://twitter.com/robilad [email protected] Java 2 Programming Language 3 Virtual Machine 4 Cross- platform Programming Environment 5 Community Of Communities 6 Pretty successful 7 ~1B LOC of Open Source Code written in it (acc. to ohloh.net) 8 That's just the visible space 9 What else happened in the last 10 years? 10 Open Source 11 From fringe to mainstream 12 Open Innovation across organizational boundaries 13 Remember shipping containers? 14 Changed the world 15 Radically reduced transaction costs 16 For material goods 17 Standardized measures 18 Optimization opportunities 19 Open Source does the same 20 For software components 21 Standardized Legal Containers 22 Permeable development 23 Lowered barrier to participation 24 Collaborative User Innovation 25 What else happened? 26 Linux 27 From fringe to mainstream 28 Cloud, Cluster, Server, Netbook, TV, Phone, ... 29 Anyone can create a Linux- based software platform 30 shipping yard, fleet & port in one 31 Organic growth 32 Cambrian explosion of Linux distros 33 Selective Pressure On Development Tools on Linux Strongly Favors Open Source 34 Manifests itself around: availability, integration, ease of use 35 Example: sudo aptitude install openjdk-6-jdk vs. many minutes of manual work 36 Example: sudo aptitude build-dep openjdk-6 vs. many hours of manual work 37 Open Source + Java + Linux 38 39 OpenJDK 7 40 JDK 7 41 Open Source 42 GPL v2 43 Classpath Exception 44 2006: From closed to open 45 First Step: Get the code out 46 Putting the effort in perspective 47 Mozilla 1.2M SLOCs 48 Eclipse 2.2M SLOCs 49 OpenJDK 3.5M SLOCs 50 Done within one year 51 Managing expectations 52 Pessimist extremists: Java will be forked to death! 53 Well, no. Didn't happen. 54 Optimist extremists: I want a feature! And I want it now! 55 Well, probably no. You can have a go at it yourself, though. 56 Culture change 57 2007: Cleaning up 58 Second Step: 100 % Open Source 59 Replacing encumbered third-party code 60 Removing structural barriers to innovation 61 Fully open source bootstrap 62 IcedTea 63 Gervill Sound Synthesizer 64 64-Bit Plugin 65 Packaging 66 OpenJDK 6 67 2008: Infrastructure & Adoption 68 Third Step: Put it to use 69 Mercurial 70 External Committers 71 JDK 7 mainline 72 Sidestreams of development 73 Feature Projects 74 Like NIO2, MLVM & Jigsaw 75 Making JDK & JVM suitable for more problems 76 Porting Projects 77 Like Zero, Shark, BSD Port 78 Putting OpenJDK in more places 79 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 80 Removing social barriers to innovation 81 2009: JDK 7 Milestones 82 Fourth step: Create more opportunities to innovate 83 Code going from closed to open often has a tough learning curve 84 Private conversations 85 Insider knowledge 86 Easier to learn the ropes writing new code 87 Public knowledge 88 Searchable knowledge 89 In practice: Modularize the code base 90 Reducing complexity 91 Removing intrinsic barriers to innovation 92 Where are we now? 93 Gradually growing, diverse Community 94 Individual Developers 95 BSD Port Landon Fuller Greg Lewis Kurt Miller Christos Zoulas 96 Academia 97 Type Annotations Mahmood Ali Michael Ernst 98 Corporate Contributors 99 Sun, Red Hat, Google, AMD 100 Total: 180 ! @Sun.com: 47 101 25 Projects 102 Both Incremental Innovation 103 XRender Pipeline 104 And Disruptive Innovation 105 Dynamic language support 106 Larger Community 107 IcedTea 108 Jalimo 109 Cacao VM 110 Maxine VM 111 JNode OS 112 IKVM.NET 113 What about the language? 114 Size matters 115 Big changes harder then small ones 116 Project Coin 117 small language changes 118 Strings in switch 119 String s = ... switch(s) { case "foo": processFoo(s); break; } 120 Improved Type Inference for Generic Instance Creation 121 AKA: Diamond 122 // type less: Map<String, List<String>> map = new HashMap<>(); 123 Language support for JSR 292 124 Object x = InvokeDynamic.getMeSomething(); MethodHandle mh = ...; mh.invoke(); int #"strange variable name" = 42; System.out.println(#"strange variable name"); // prints 42 125 … and more 126 http://openjdk.java.net/projects/coin 127 Not so small changes 128 Type Annotations 129 JSR 308 130 Checker framework 131 @NonNull 132 @Nullable 133 javac -processor NullnessChecker MyFile.java 134 @ReadOnly 135 http://openjdk.java.net/projects/type-annotations 136 JSR 294 137 Improved modularity support in the language 138 Independent of a module system 139 Explicit Dependencies + Versioning + Accessibility 140 module-info.java 141 src/org/openjdk/SomeTool.java src/module-info.java 142 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; } 143 understood by javac 144 understood by java 145 $CLASSPATH is dead 146 Jigsaw 147 modularity for the JDK 148 Size matters 149 well-defined subsets 150 Just-enough JDK 151 simple & static 152 low level 153 native packaging 154 jpkg 155 Now: deb 156 Soon: RPM SVR4 IPS 157 Add your format: [email protected] 158 http://openjdk.java.net/projects/jigsaw/ 159 JDK 7 160 8 milestones 161 M1 (finished) 162 Compressed OOPs 163 Garbage First Garbage Collector 164 M2 (finished) 165 NIO2 166 URLClassLoader.close() 167 M3 (finished) 168 InvokeDynamic 169 Stream Control Transmission Protocol 170 Sockets Direct Protocol 171 Unicode 5.1 172 ClassLoader Architecture Update 173 M4 (finished) 174 Forward-port 6u10 features 175 Type Annotations 176 M5 (ongoing) 177 Update the XML stack 178 Elliptic Curve Cryptography 179 Swing Updates 180 Concurrency & Collections Updates 181 Project Coin 182 http://openjdk.java.net/projects/jdk7/ 183 Contribute 184 http://openjdk.java.net 185 Patches for JDK 7 186 http://bugs.openjdk.java.net 187 Stay up to date 188 http://planetjdk.org 189 Discuss development 190 [email protected] 191 [email protected] 192 Q & A [email protected] 193.
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