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Real World Java 9
The document discusses the features and enhancements introduced in Java 9, including improved performance, modular application packaging, and the introduction of reactive programming concepts. It addresses challenges developers may face during migration, particularly with Jigsaw module system and IDE support, while emphasizing the importance of understanding new APIs and best practices. The content highlights both the potential benefits of adopting Java 9 and the considerations to keep in mind for existing codebases.
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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
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- 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
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- 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
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- 10. Java 9 inProduction?
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- 26. Pain • Gradle notworking • Reorganising the file structure is non-trivial • This project has no command-line build • IDE support is not what we’re used to • RTFM. No, really do.
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- 29. • Akka Streams •MongoDB Reactive Java Driver • Ratpack • Reactive Rabbit • Reactor • RxJava • Vert.x Implementations
- 30. Java 9 FlowAPI
- 32. Where to useit?
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- 52. Java 8 vsReactive
- 55. • Work withmultiple streams • Have multiple consumers • Backpressure • Very different concurrency model Reactive
- 56. Other Java 9Features
- 57. 269: Convenience Factory Methodsfor Collections
- 58. 213: Private Methodson Interfaces
- 59. New Methods onthe Streams API
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- 62. 102: Process APIUpdates
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- 69. We’d Love YourHelp https://youtrack.jetbrains.com/i ssue/IDEA-161611
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- 71. Your code mightbreak! Try it out now to find out sooner, not later
- 72. • 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
- 73. • 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
- 74. Java 9 isstill evolving So are the tools we use
- 75. Don’t rush into modularisation It might not be for you
- 76. Reactive Streams arenot the same as Java 8 Streams Different behaviour, different use cases
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- 79. Encourages new waysof working
- 80. Just a bitnicer to write code
- 81.