Real World Java 9 - JetBrains Webinar
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The feature we always hear about whenever Java 9 is in the news is Jigsaw, modularity. But this doesn't scratch the same developer itch that Java 8's lambdas and streams did, and we're left with a vague sensation that the next version might not be that interesting. Java 9 actually has a lot of great additions and changes to make development a bit nicer. These features can't be lumped under an umbrella term like Java 8's lambdas and streams, the changes are scattered throughout the APIs and language features that we regularly use. In this presentation Trisha will show, via live coding: - What the Java Platform Module System is and how to make your code modular - How we can use the new Flow API to utilise Reactive Programming - The improvements to the Streams API that make it easier to control infinite streams - How to the Collections convenience methods simplify code Along the way we'll bump into other Java 9 features, including some of the additions to interfaces and changes to deprecation.
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Real World Java 9 - JetBrains Webinar
- 1. — Trisha Gee (@trisha_gee) Developer & Technical Advocate, JetBrains Real World Java 9
- 2. Any questions? Use the Questions pane in the GoToWebinar window. We’ll try to answer as we go along.
- 4. Real World Java 9 • Jigsaw in Action • The Reactive API in Java 9 • Everything Else
- 5. Why Java 9?
- 6. 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
- 7. Jigsaw
- 8. REPL
- 10. 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
- 11. The Case Study
- 15. Compiling with Java 9
- 16. Jigsaw
- 17. • JEP 200: The Modular JDK • JEP 201: Modular Source Code • JEP 220: Modular Run-Time Images • JEP 260: Encapsulate Most Internal APIs • JEP 261: Module System • JEP 282: jlink: The Java Linker • JSR 376: Java Platform Module System Project Jigsaw
- 18. Java Platform Module System (JPMS)
- 23. module-info.java
- 24. Pain • Some structural reorganisation may be needed • IDE support is not what we’re used to • RTFM. No, really do.
- 25. • Cleaner design • Reliable configuration • Smaller deployables Gain
- 26. Reactive API
- 28. • Akka Streams • MongoDB Reactive Java Driver • Ratpack • Reactive Rabbit • Reactor • RxJava • Vert.x Implementations
- 29. Java 9 Flow API
- 31. Other Java 9 Features
- 32. 269: Convenience Factory Methods for Collections
- 33. 213: Private Methods on Interfaces
- 34. New Methods on the Streams API
- 35. New Methods on Optional
- 37. 102: Process API Updates
- 38. 238: Multi-Release JAR Files
- 43. JShell (REPL)
- 45. We’d Love Your Help https://youtrack.jetbrains.com/issue/IDEA- 161611
- 46. The Pain
- 47. Your code might break! Try it out now to find out sooner, not later
- 48. • 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
- 49. • 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
- 50. Tools are still evolving …another reason to try it early
- 51. Don’t rush in to modularisation It might not be for you
- 52. The Gain
- 54. Encourages new ways of working
- 55. Just a bit nicer to write code
- 56. …and you’ll be ready for Java 10 Or 18.3…
Editor's Notes
- Show the working application
- 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
- Lets the JDK developers move faster, so we can deliver twice a year Incubating
- Started with Gradle Structure Ended up with this
- Started with Gradle Structure Ended up with this
- JDK 9
- 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 - module diagrams
- 20 minutes into presentation?
- Need at least 15 minutes remaining This section is 10 minutes
- Oxymoron Annotation params No warning on imports Wish the param had been called “doomed”
- Can generate inside IntelliJ with… -html5
- Including camel case search http://download.java.net/java/jdk9/docs/api/overview-summary.html
- https://youtrack.jetbrains.com/issue/IDEA-161611 Please do give us feedback
- 5 minutes remaining?
- Defaults (GC) changing, validation being added, tools removed, internal APIs being hidden, logging messages changing
- Gradle, Groovy not working for me
- You can make use of the modules in the JDK, but you don’t need to apply it everywhere
- Modules, separation of concerns
- REPL, Reactive
- All the other features