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Eclipse JDT Embraces Java 9 – An Insider’s View
This document discusses Eclipse JDT's support for Java 9 features. It provides an overview of key Java 9 changes like modules and modular runtime images. It also summarizes changes to Eclipse/JDT's compiler, IDE, and architecture to support modules and other Java 9 features. The presentation includes a demo of Eclipse's Java 9 module support and error reporting for modules.
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Eclipse JDT Embraces Java 9 – An Insider’s View
- 1. ECLIPSE JDT EMBRACESJAVA 9 AN INSIDER’S VIEW MANOJ PALAT, IBM
- 2. ACKNOWLEDGEMENTS • Stephan Herrmann •Sasikanth Bharadwaj • Jay Arthanareeswaran • Till Brychcy • Stefan Xenos • Markus Keller • Mateusz Matela • Sergey Prigogin • Fabian Steeg • Igor Fedorenko DevoxxUS 2017
- 3. AGENDA • Java 9Features from JDT Perspective • General introduction to the feature • changes in JDT for the feature • Current status of the implementation • Demo • Eclipse launch with JDK 9 (ea-159) • Eclipse/JDT Architecture • What’s new in Java 9 – high level • Module Concepts • IDE (Migrating + other features) • Command Line Compiler • Milling Project Coin • References/Resources • Future Work DevoxxUS 2017
- 4. ECLIPSE/JDT ARCHITECTURE DevoxxUS 2017 ECLIPSEJAVA COMPILER JAVA MODEL • Model from Project • CU, Type, Methods • Lightweight - views Batch Compiler JAVA SEARCH • Declarations • References • Hierarchy DOM AST • Fine grained • Statements, identifiers • Fully resolved JAVA DEVELOPMENT TOOLS (JDT) UI
- 5. KEY CHANGES INJAVA /JDK 9 • JEP 261 : Java Platform Module System (JSR 376) • Link time phase – jlink • Module path options (javac, jlink, and java) • Modular jar file • Jmod format • JEP 200: The Modular JDK • JEP 220: Modular Runtime Images • JEP 260: Encapsulate internal APIs • jdeps –jdkinternals • JEP 223: New Version String Scheme • $MAJOR.$MINOR.$SECURITY.$PATCH • JEP 213: Milling Project Coin • A few small changes DevoxxUS 2017
- 6. second DevoxxUS 2017 first pack21, pack22 pack23.internal thirdzfourth Identify the module Dependence Readability Accessibility Implied Readability Module Graph pack21, pack22 MODULES pack31 // module-info.java module first { requires second; } module second { exports pack21, pack22; requires zfourth; requires transitive third; }
- 7. MODULE-INFO. JAVA ->MODULE-INFO.CLASS • attribute_name_index • explicit module info • requires table – requires_index • exports table • exports_to_count • internal Packages DevoxxUS 2017
- 8. Modular Run-Time Images •Source modules • Jar files • New Format! • All in one big (+ couple more) Jimage (or) • Individual JMOD files • Format of the archive probably will remain internal • Java.nio based File system provider (jrt-fs) • Works with JRE 8 and above DevoxxUS 2017
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- 10. COMPILER CHANGES Enhancements • Newkeywords recognition • Error reporting as per jls at various levels • Implicit accessibility checks • Translating into class file • Reading the new class attributes • Fishing out info from binary format -jrtfs • Module-path and command line changes Demo • Source modules (--module-source-path) • Binary modules (-mp) • Target JDK -system • Error reporting DevoxxUS 2017
- 11. ECLIPSE IDE: JDTCHANGES/DEMO • Package Explorer • Java Model • DOM • Content Assist • Search • Quick Fix DevoxxUS 2017 • One Module in a Project • Support for JDK 9 addition • Reading the new format – Lookup • Module Dependency Capture • Migrating existing code to Java 9 (not very proud)
- 12. MILLING PROJECT COIN •Allow @SafeVargs on private instance methods. (9.6.4.7) • Allow effectively-final variables to be used as resources in the try-with-resources statement. (14.20.3) • Allow diamond with anonymous classes if the argument type of the inferred type is denotable. • Complete the removal, begun in Java SE 8, of underscore from the set of legal identifier names. • Add support for private interface methods. DevoxxUS 2017
- 13. USEFUL LINKS Install Options •Marketplace: https://marketplace.eclipse.org/content/java-9- support-beta-oxygen • Y-Build Page: http://download.eclipse.org/eclipse/downloads /YIndex.php • P-Build (Update Site): http://download.eclipse.org/eclipse/updates/4. 6-P-builds References • JDT/Core Java 9 Enhancement Tracker Root: https://bugs.eclipse.org/bugs/show_bug.cgi?id= 457413 • State of the module System: http://openjdk.java.net/projects/jigsaw/spec/so tms/ • Milling Project Coin: http://openjdk.java.net/jeps/213 DevoxxUS 2017
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- 16. DEMO • Installation Options •Java Model JDK9 Modules Display • Migration Helper • A simple module-info.java file • Content Assist • Dependency of two modules • Error displays • Eff. Final Try Statement • Command Line Options DevoxxUS 2017
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