9 Lives of Java 9 abridged

Not a focused presentation, but rather an overview of all features with highlights on shell, modules, and G1GC. An abridged version of 9 Lives of Java 9, allowing for some time for a practical demo or trivia game.

First presented at @JDD_Krakow on 3rd October 2017.

Transcript

1. 9 Lives of Java 9
   @LAFK_pl Consultant @
   NO
   WORKSHOPS
   

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2. About me
   @LAFK_pl
   Consultant @
   Tomasz Borek
   

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3. Currently
   ●
   Kraków
   ●
   Newbies or juniors
   ●
   4-5 months
   ●
   To programmers
   ●
   Or as close as I can
   ●
   µservices etc.
   ●
   With JS, QA, etc.
   ●
   4th edition starts this
   November
   

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4. 1st Life
   @LAFK_pl Consultant @
   

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5. Oak – The Green Platform
   

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6. The Green Team
   

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7. Green project
   ●
   C++ extension →
   ●
   Oak →
   ●
   Green Platform (OS)→
   ●
   Java
   ●
   Home entertainment
   

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8. Green project
   

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9. Star 7 home entertainment system
   ●
   Star 7 (summer 1992)
   

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10. The Duke Mascott
    ●
    Star 7 (summer 1992)
    

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11. Ends because...
    ●
    Too much control in hands of the users
    – Cable TV industry wants dumber remotes
    ●
    PDAs didn’t quite took off
    ●
    Instead, World Wide Web did
    – Hence, WebRunner → HotJava, browser
    – Appropriate interactivity
    – 1994 – retargeting to WWW
    – 1995 – HotJava
    – 1996...
    

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12. 2nd Life
    @LAFK_pl Consultant @
    January 23, 1996
    

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13. Java – JDK 1.02
    

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14. WORA
    ●
    JIT (Just In Time) compiler for Windows
    ●
    Network byte order
    ●
    So, all that to run C code?
    

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15. JDK 1.02, first Java
    ●
    AWT event model
    ●
    Inner classes
    ●
    JavaBeans
    ●
    JDBC
    ●
    RMI
    ●
    Reflection
    (introspection only,
    TBH)
    ●
    GC
    ●
    VM
    ●
    MCM (green threads)
    ●
    Sandbox
    February 19, 1997
    

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16. 3rd Life
    @LAFK_pl
    December 8, 1998 Consultant @
    

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17. Playground
    

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18. Playground
    ●
    Tripled in size
    ●
    Introduced JCF
    ●
    strictfp keyword
    ●
    Swing graphical API
    ●
    Sun’s JVM had a JIT
    compiler now
    ●
    Java plug-in
    

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20. Enterprise
    ●
    Lovely Sun marketing
    – SE, ME, EE
    ●
    Enterprise rulz
    – J2EE :-)
    ●
    EJBOSS
    ●
    Desktop? Forget it!
    

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21. 4th Life? Nah, just growth
    @LAFK_pl
    May 8, 2000 Consultant @
    

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22. Spreading the wings
    ●
    Kestrel (1.3, right) – improvements everywhere
    (PermGen, HotSpot JVM). JNDI and JPDA though!
    ●
    Merlin had APIs and libs: NIO, JAXP, Logging, JDBC
    3, Preferences, Ipv6, RegEx, Images. Plus Java Web
    Start, assert and chaining exceptions.
    

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23. First community edition
    ●
    As JSR-59
    ●
    Java Community
    Process
    ●
    February 6th, 2002
    

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24. 4th Life
    @LAFK_pl
    September 30, 2004 Consultant @
    

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25. Tiger
    ●
    Majority of interview
    questions
    – Next big thing is JDK8
    ●
    Enum, annotations,
    generics, foreach,
    varargs, auto-/un-
    boxing, concurrency,
    scanner...
    ●
    Improved JMCM!
    

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26. Un-Life
    @LAFK_pl
    Till, 2012 or so Consultant @
    

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27. Mustang and Dolphin
    ●
    Invokedynamic
    ●
    64bit pointers
    ●
    Coin
    ●
    8 and 9
    ●
    perf
    ●
    JVM perf
    ●
    GUI (Swing)
    ●
    javac, JDBC 4, JAXB 2
    http://openjdk.java.net/projects/coin/
    

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28. Ends because...
    ●
    Too much chaos in marketing
    ●
    Too much problems with enterprise
    

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29. RIP
    October 08, 2013:
    if Java is dying, it sure looks awfully healthy
    

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30. Game changers
    

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31. Current Life (5th)
    @LAFK_pl
    March 18, 2014 Consultant @
    JDK 8 March 18, 2014
    JDK 9 September 21, 2017
    

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32. So, JDK 9 JEPS?
    91 all together
    GA on 21st September 2017
    lafk.pl/jdk9-on-jdd/
    

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33. Project Kulla = JShell
    ●
    222: jshell – the Java shell (REPL)
    ●
    Kulla – builder god, banished when done
    ●
    https://docs.oracle.com/javase/9/tools/jshell.htm
    ●
    /command → /exit /help intro /help shortcuts
    ●
    /list
    ●
    /save
    ●
    /open some-java-file.java
    

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34. Project Kulla = JShell
    ●
    222: jshell – the Java shell (REPL)
    ●
    Features Tab-completion, quite nice at that!
    ●
    Jline uses C readline lib
    ●
    Look for ~/.inputrc or /etc/input.rc
    

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35. Project Kulla = JShell
    ●
    Build web-app with REPL with Kuba Marchwicki
    

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36. Project Jigsaw
    ●
    JAR hell, classpath loading problems
    ●
    JARs are not components, they are files
    ●
    JDK and most Java apps are monoliths
    ●
    JDK weighs a lot
    ●
    Your Java app weighs a lot
    ●
    µservices aren’t monolithic (shouldn’t be!)
    ●
    Game changers!
    

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37. Project Jigsaw
    ●
    Rabea Gransberger – refactor to modules
    

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38. Project Jigsaw - JEPs
    ●
    162: Prepare for Modularisation
    ●
    200: The Modular JDK
    ●
    201: Modular Source Code (Jigsaw itself)
    ●
    220: Modular Run-Time images
    – Standard class libraries modularised (rt.jar)
    – Files more efficient than JAR
    ●
    260: Most internal APIs now encapsulated
    – Unsafe, VarHandles, MethodHandles
    ●
    275: java packager
    ●
    282: jlink, Java linker
    7 in
    total
    

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39. Modules in a nutshell
    ●
    Base always present
    ●
    Requires – modules you need
    ●
    Exports – what you publish (here public matters)
    ●
    Use – required services – via ServiceLoader
    ●
    http://cr.openjdk.java.net/~mr/jigsaw/jdk9-module-summary.html
    ●
    https://bugs.openjdk.java.net/secure/attachment/72525/jdk.png
    ●
    module-info.java, module path
    ●
    jlink, jdepend
    ●
    https://github.com/accso/java9-jigsaw-depvis
    

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40. Default GC is G1
    ●
    JEP 248
    ●
    CMS deprecated
    – ParNew as well
    ●
    Regions, categorized
    ●
    Huge objects
    ●
    JEPs:
    – 250: Strings in CDSes
    – 214: remove deprecated
    combinations
    ●
    Not for small heaps
    ●
    String Deduplication
    – JEP 192, 8u20
    

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41. Unicode, Javadoc, Nashorn
    ●
    221: Simplified Doclet API
    ●
    224: HTML5 Javadoc
    ●
    225: Javadoc Search
    ●
    226: UTF-8 Property Files
    ●
    267: Unicode 8.0 (7,3k+)
    ●
    227: Unicode 7.0 (2,8k+)
    ●
    236: Parser API for Nashorn
    ●
    252: Use CLDR Locale Data by Default
    ●
    292: Implement Selected ECMAScript 6 Features in Nashorn
    9 in
    total
    

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42. JEP 266: More concurrent updates
    

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43. Things will be removed!
    ●
    277: Enhanced Deprecation
    ●
    289: Deprecate the Applet API
    – forRemoval set to false
    ●
    214: Remove GC Combinations Deprecated in JDK 8
    ●
    231: Remove Launch-Time JRE Version Selection
    ●
    240: Remove the JVM TI hprof Agent
    ●
    241: Remove the jhat Tool
    ●
    298: Remove Demos and Samples
    5 in total
    

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44. Security
    ●
    219: Datagram Transport Layer Security (DTLS)
    ●
    229: Create PKCS12 Keystores by Default
    ●
    244: TLS Application-Layer Protocol Negotiation Extension
    ●
    249: OCSP Stapling for TLS
    ●
    273: DRBG-Based SecureRandom Implementations
    ●
    287: SHA-3 Hash Algorithms
    ●
    288: Disable SHA-1 Certificates
    ●
    290: Filter Incoming Serialization Data
    8 in total
    Another 8 in perf
    

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45. Libraries changes
    ●
    255: Merge Selected Xerces 2.11.0 Updates
    into JAXP
    ●
    259: Stack-Walking API
    ●
    260: Encapsulate Most Internal APIs
    ●
    266: More Concurrent Updates
    ●
    269: Convenience Factory Methods for
    Collections
    5 selected
    

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46. JVM changes
    ●
    193: Variable Handles
    ●
    245: Validate JVM Command-Line
    Flag Arguments
    ●
    228: Add More Diagnostic
    Commands
    ●
    238: Multi-Release JAR Files
    ●
    247: Compile for Older Platform
    Versions
    ●
    223: New Version-String Scheme
    ●
    217: Annotations Pipeline 2.0
    ●
    280: Indify String Concatenation
    ●
    272: Platform-Specific Desktop
    Features
    Whopping
    32
    in total
    ●
    233: Generate Run-Time Compiler
    Tests Automatically
    ●
    235: Test Class-File Attributes
    Generated by javac
    ●
    211: Elide Deprecation Warnings on
    Import Statements
    ●
    212: Resolve Lint and Doclint
    Warnings
    ●
    216: Process Import Statements
    Correctly
    ●
    279: Improve Test-Failure
    Troubleshooting
    ●
    281: HotSpot C++ Unit-Test
    Framework
    ●
    284: New HotSpot Build System
    ●
    248: Make G1 the Default Garbage
    Collector
    ●
    278: Additional Tests for
    Humongous Objects in G1
    ●
    243: Java-Level JVM Compiler
    Interface
    ●
    270: Reserved Stack Areas for
    Critical Sections
    ●
    274: Enhanced Method Handles
    ●
    237: Linux/AArch64 Port
    ●
    158: Unified JVM Logging
    ●
    271: Unified GC Logging
    ●
    165: Compiler Control
    

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47. So...?
    ●
    Jigsaw and modularity
    – Image, modules, JAR replace, linking, deps finding
    ●
    JVM
    – tooling, ground work (CLI, GC, String indify),
    ●
    APIs
    – JShell, Stack Walking, Process, Flow
    ●
    Performance, Security
    ●
    Why?
    

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48. Future (JDK18.03?) changes?
    

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49. Java 18.03
    ●
    Every quarter (first month): bug fixes and
    patches
    ●
    Every March – feature release
    ●
    Every September – LTS feature release
    – LTS – 3 years
    ●
    https://mreinhold.org/blog/forward-faster
    

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50. In short
    ●
    Java went like a river, changing directions
    – Smart appliances → net → EE → SE → FP
    – Devs see language changes, but there’s more
    ●
    IoT, Big Data, Cloud (hence: FP, modularity)
    ●
    Jigsaw is the theme, but foundations improved!
    – JDK, perf, Strings, compiler, GC, tooling
    – Stack, Process, Jshell, Xerces, Flow
    

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51. Java EE
    – Not J2EE, not anymore
    ●
    Waited for JDK9 and Jigsaw
    ●
    Folks moved ahead though
    – EE Guardians (https://javaee-guardians.io/)
    – MicroProfile (http://microprofile.io/)
    – Spring and container/server vendors
    ●
    Good summary
    – https://www.infoq.com/news/2017/04/long-road-for-java-ee-8
    ●
    Donated to Eclipse Foundation!
    

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52. 9 Lives of Java 9
    @LAFK_pl
    Now it will move faster!
    4 remain!
    Consultant @
    

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