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Java 9 Functionality and Tooling

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Java 9 will include many new features beyond just Jigsaw modules, including enhanced method handles, modular application packaging, and dynamic linking capabilities. It may cause some code to break, so developers are encouraged to try it out now rather than later. Java 9 will improve performance in areas like locking, graphics, and hardware usage. Tooling is being updated for Java 9 as well, with IntelliJ IDEA gaining features like automatic module-info generation and JLink artifact support.

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— Trisha Gee (@trisha_gee) Developer & Technical Advocate, JetBrains Java 9 in Anticipation: Features and Tooling
Safe Harbour Blah blah, don’t rely on anything I’m saying, I’m not committing to anything, estimates are hard, things change, this is just what’s in our head right now, no promises. OK? kthxbai
Java 9
Jigsaw, yay!
But it might break everything…
…and I don’t need it anyway.
So, thanks but no thanks. I’ll wait for Value Types.
Java 9 is so much more than Jigsaw
274: Enhanced Method Handles 275: Modular Java Application Packaging 276: Dynamic Linking of Language-Defined Object Models 277: Enhanced Deprecation 278: Additional Tests for Humongous Objects in G1 279: Improve Test-Failure Troubleshooting 280: Indify String Concatenation 281: HotSpot C++ Unit-Test Framework 282: jlink: The Java Linker 283: Enable GTK 3 on Linux 284: New HotSpot Build System 285: Spin-Wait Hints 287: SHA-3 Hash Algorithms 288: Disable SHA-1 Certificates 289: Deprecate the Applet API 290: Filter Incoming Serialization Data 292: Implement Selected ECMAScript 6 Features in Nashorn 294: Linux/s390x Port 295: Ahead-of-Time Compilation 297: Unified arm32/arm64 Port 298: Remove Demos and Samples
Free Lunch! • Better Use of Memory • Better Performance of: • Locking • Secure Apps • Graphics • Better Use of Hardware • Better Documentation • Prettier Graphics (Windows and Linux) • Faster Compilation
Compiling with Java 9
Java 9 Functionality and Tooling
https://wiki.openjdk.java.net/display/Adop tion/JDK+9+Outreach
Your code might break! Try it out now to find out sooner, not later
• 214: Remove Deprecated GC Combinations • 231: Remove Launch-Time JRE Version Selection • 240: Remove the JVM TI hprof Agent • 241: Remove the jhat Tool • 260: Encapsulate Most Internal APIs • 289: Deprecate the Applet API • 298: Remove Demos and Samples Going Away
• 158: Unified JVM Logging • 223: New Version-String Scheme • 245: Validate JVM Command-Line Flag Arguments • 248: Make G1 the Default Garbage Collector • 271: Unified GC Logging Possible Unexpected Behaviour
Jigsaw
• Generation of module-info.java • Syntax support for module-info.java • Code completion in module-info.java • Compilation of multi-module projects • Quick fixes to add requires statements IntelliJ IDEA 2017.1
• Automatic generation of module-info.java • IntelliJ IDEA module structure recognised on import • JLink artifacts IntelliJ IDEA 2017.?
We’d Love Your Help https://youtrack.jetbrains.com/issue/IDEA- 154240
Easy to Use Features
New Methods on the Streams API
269: Convenience Factory Methods for Collections
213: Milling Project Coin Private Methods on Interfaces
277: Updated Deprecation
102: Process API Updates
266: More Concurrency Updates
JShell (repl)
https://java.net/downloads/adoptopenjdk/ REPL_Tutorial.pdf
We’d Love Your Help https://youtrack.jetbrains.com/issue/IDEA- 161611
Interesting Tidbits
263: HiDPI graphics on Windows
224: HTML5 Javadoc
225: Javadoc search
248: Default Garbage Collector is now G1
In Summary
Java 9 is more than Jigsaw
There’s quite a lot to gain
Better to find the pain sooner than later
http://bit.ly/j9IntelliJ @trisha_gee

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Java 9 Functionality and Tooling

Editor's Notes

  1. Also, everything I’m going to demo is early access
  2. Java 9 is coming!
  3. Hiding internal APIs Affecting libraries I use
  4. Firstly, show IntelliJ working perfectly fine with JDK 9 Show “sense” at the Java 8 level compiling with Java 9 Will have some missing pieces Can’t use underscores THIS SECTION IS ABOUT ERRORS THAT MIGHT NOW BE IN YOUR CODE
  5. I’m using 160
  6. Whole bunch of notes to help you out with adopting Java 9
  7. Defaults (GC) changing, validation being added, tools removed, internal APIs being hidden, logging messages changing
  8. Caveat: modules must be defined in corresponding IntelliJ modules Caveat: dependencies in IDEA modules must match Requires statements (there are quick fixes for this) Support is for the EA downloads, not the –jigsaw ones From version ?? Circular dependencies not supported right now
  9. This section is about taking advantage of new features
  10. IntelliJ supports, no warnings or errors
  11. Oxymoron Annotation params No warning on imports Wish the param had been called “doomed”
  12. Reactive Streams Completable Future
  13. https://youtrack.jetbrains.com/issue/IDEA-161611 Please do give us feedback
  14. https://youtrack.jetbrains.com/issue/IDEA-161611 Please do give us feedback
  15. Currently a work in Progress
  16. Can generate inside IntelliJ with… -html5
  17. Including camel case search http://download.java.net/java/jdk9/docs/api/overview-summary.html
  18. Modules, separation of concerns
  19. Unless you’re using Gradle