Java SE

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Java SE

Simon RitterJava Technology Ambassador

@speakjava


JDK 8 in the works

• JDK 7 shipped in July 2011

• JDK 8 scheduled to ship in 2014• Expecting a 2-year cadence between platform releases going forward

• Java SE 8 platform under JSR 336

• Major features planned for JDK 8• Lambda expressions and default methods (JSR 335)

• Annotation-related language changes (JSR 308)

• Date and Time API (JSR 310)

• Compact Profiles


JDK 8

Java for Everyone• Profiles for constrained devices• JSR 310 - Date & Time APIs• Non-Gregorian calendars• Unicode 6.2• ResourceBundle. • BCP47 locale matching• Globalization & Accessibility

Innovation• Lambda aka Closures• Language Interop• Nashorn

Core Libraries• Parallel operations for core

collections APIs• Improvements in functionality• Improved type inference

Security• Limited doPrivilege• NSA Suite B algorithm support• SNI Server Side support• DSA updated to FIPS186-3• AEAD JSSE CipherSuites

Tools• Compiler control & logging• JSR 308 - Annotations on

Java Type• Native app bundling • App Store Bundling tools

Client• Deployment enhancements• JavaFX 8• Java SE Embedded support• Enhanced HTML5 support• 3D shapes and attributes• Printing

General Goodness• JVM enhancements• No PermGen limitations• Performance lmprovements


The road of closures in Java

• In 2006-2008, a vigorous community debate about closures• Multiple proposals, including BGGA , CICE, and FCM

• December 2009 – OpenJDK Project Lambda formed• November 2010 – JSR-335 filed

• Current status• Draft specification available

• Prototype (source and binary) available on OpenJDK

• Coming soon to mainline JDK 8 builds


Coordinated Platform Upgrade with Lambda

• Language• Lambda Expressions (closures)

• Interface Evolution with default methods

• Libraries• Bulk data operations on Collections

• More library support for parallelism

• JVM• Default methods

• Enhancements to invokedynamic


Let us look at some code

// Event handler for when things go terribly wrongfilterTask.setOnFailed(new EventHandler<WorkerStateEvent>() { @Override public void handle(WorkerStateEvent e) { e.getSource().getException().printStackTrace(); }});// Event handler for when things go terribly wrongfilterTask.setOnFailed(e -> e.getSource().getException().printStackTrace());

Robust error handling in a scheduling application


for (Shape s : shapes) { if (s.getColor() == BLUE) s.setColor(RED);}

shapes.forEach(s -> { if (s.getColor() == BLUE) s.setColor(RED);});


Extension Methods

interface Collection<T> { default void forEach(Block<T> action) { for (T t : this) action.apply(t); }

// Rest of Collection methods…}


Project Lambda

• Lambda expressions + extension methods allow:

• Internal iteration

• Bulk data operations for existing types

• Better support for parallelism leveraging fork/join


Project Nashorn


Test Pilots Wanted

• Developer Preview available• Schedule on: http://openjdk.java.net/projects/jdk8

• Contribute to OpenJFX: http://openjdk.java.net/projects/openjfx

• JDK 8 builds with many features already available• Try out Lambda and check out JavaFX 8: http://jdk8.java.net

• Participate in the JCP for free through your local JUG

• Jigsaw builds also available from Java.net

Java SE

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