Downloaded 23 times
Uploaded byTrisha Gee
Real World Java 9
This document provides an overview of new features in Java 9 including Jigsaw modularization, reactive programming enhancements, and other updates. Key points covered include better performance from Jigsaw and memory and hardware optimizations, integration of the Reactive Streams API, a new module system that encourages cleaner design and deployments, and the addition of the JShell REPL tool. Potential issues for migration are also noted around structural changes needed and tooling maturity.
More Related Content
Real World Java 9
- 1. — Trisha Gee (@trisha_gee) Developer& Technical Advocate, JetBrains Real World Java 9
- 2. Real World Java9 • Jigsaw in Action • Reactive Programming in Java 9 • The Other Good Stuff
- 3.
- 4. Free Lunch! • BetterUse of Memory • Better Performance of: • Locking • Secure Apps • Graphics • Better Use of Hardware • Better Documentation • Prettier Graphics (Windows and Linux) • Faster Compilation
- 5.
- 6.
- 7.
- 8. 274: Enhanced MethodHandles 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
- 9.
- 10. Java 9 inProduction?
- 11.
- 12.
- 13.
- 15.
- 16.
- 17.
- 25.
- 26. Pain • Some structuralreorganisation may be needed • This project has no command-line build • IDE support is not what we’re used to • RTFM. No, really do.
- 27. • Cleaner design •Smaller deployables Gain
- 28.
- 29.
- 30. • Akka Streams •MongoDB Reactive Java Driver • Ratpack • Reactive Rabbit • Reactor • RxJava • Vert.x Implementations
- 31. Java 9 FlowAPI
- 33. Where to useit?
- 38.
- 42. Java 8 vsReactive
- 44. • Work withmultiple streams • Have multiple consumers • Backpressure • Very different concurrency model • Reactive API lets you work with different implementations Reactive
- 45. Other Java 9Features
- 46. 269: Convenience FactoryMethods for Collections
- 47. 213: Private Methodson Interfaces
- 48. New Methods onthe Streams API
- 49.
- 50.
- 51. 102: Process APIUpdates
- 52.
- 53.
- 54.
- 56.
- 57.
- 58. We’d Love YourHelp https://youtrack.jetbrains.com/issue/IDEA- 161611
- 59.
- 60. Your code mightbreak! Try it out now to find out sooner, not later
- 61. • 214: RemoveDeprecated 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
- 62. • 158: UnifiedJVM 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
- 63. Java 9 isstill evolving So are the tools we use
- 64. Don’t rush into modularisation It might not be for you
- 65. Reactive Streams arenot the same as Java 8 Streams Different behaviour, different use cases
- 66.
- 67.
- 68. Encourages new waysof working
- 69. Just a bitnicer to write code
- 70.
Editor's Notes
- #12 IntelliJ IDEA 2017.2 EAP Java 9 build 173
- #14 Show the working application
- #17 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
- #19 Started with Gradle Structure Ended up with this
- #20 JDK 9
- #26 Support in the IDE: - doesn’t error - can create module-info files - basic code completion: * requires, plus completion for jdk modules * exports, plus completion for module names * opens… to… and completion - suggests adding “requires” lines - manually have to add exports
- #29 20 minutes into presentation?
- #38 Basically the same thing, but instead of injecting a function into some arbitrary position (which mine was), gives much more clarity to the end points and their jobs
- #42 Picture of what mood service does – with tweet coming in and CSV going out per tweet
- #45 Was actually a bit easier to test, because I was mocking out publishers and subscribers
- #46 Need at least 15 minutes remaining This section is 10 minutes
- #53 Oxymoron Annotation params No warning on imports Wish the param had been called “doomed”
- #54 Can generate inside IntelliJ with… -html5
- #55 Including camel case search http://download.java.net/java/jdk9/docs/api/overview-summary.html
- #57 https://youtrack.jetbrains.com/issue/IDEA-161611 Please do give us feedback
- #60 5 minutes remaining?
- #61 Defaults (GC) changing, validation being added, tools removed, internal APIs being hidden, logging messages changing
- #64 Gradle, Groovy not working for me
- #65 You can make use of the modules in the JDK, but you don’t need to apply it everywhere
- #66 Backpressure; errors; implementing your own APIs
- #68 Modules, separation of concerns
- #69 REPL, Reactive
- #70 All the other features