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What's new in Java 8
 

What's new in Java 8

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Java SE 8 presentation.

Java SE 8 presentation.

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    What's new in Java 8 What's new in Java 8 Presentation Transcript

    • What’s New in Java 8? John Clingan Oracle Product Manager – Java EE, GlassFish, EclipseLink, Avatar
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.2 The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle s products remains at the sole discretion of Oracle.
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.3 3 Lambda (JSR 335) Date/Time API (JSR 310) Type Annotations (JSR 308) Compact Profiles Lambda-Form Representation for Method Handles Remove the Permanent Generation Improve Contended Locking Generalized Target-Type Inference DocTree API Parallel Array SortingBulk Data Operations Unicode 6.2 Base64 Prepare for Modularization Parameter Names TLS Server Name Indication Configurable Secure-Random Number Generation Java SE 8 Nashorn Enhanced Verification Errors Fence Intrinsics Repeating Annotations HTTP URL Permissions Limited doPrivileged http://openjdk.java.net/projects/jdk8/features
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.4 Java SE 8: Enhancing The Core Java Platform
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.5 Java SE 8 !  Biggest change in the Java language since Java SE 5 !  Significant enhancements to the class libraries !  The main goal of these changes are … –  Better developer productivity –  More reliable code –  Better utilization of multi-core / multi-processor systems !  Code is no longer inherently serial or parallel
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.6 Lambda Expressions !  Almost all machines now are multi-core, multi-processor, or both !  We need to make it simpler to write multi-threaded Java code –  Java has always had the concept of threads –  Even using the concurrency utilities and fork-join framework this is hard !  Let’s add better library code –  This is good, but sometimes we need to change the language too !  The answer: Lambda expressions and the streams API !  Backwards compatible with existing APIs like Collections. Why Do We Need Them?
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.7 Lambda & Streams Demos
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.8 Stream Sources !  From collections and arrays –  Collection.stream() –  Collection.parallelStream() –  Arrays.stream(T array) or Stream.of() !  Static factories –  IntStream.range() –  Files.walk() !  Roll your own –  java.util.Spliterator() Many Ways To Create
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.9 Stream Sources !  Access to stream elements !  Decomposition (for parallel operations) –  Fork-join framework !  Stream characteristics –  ORDERED –  DISTINCT –  SORTED –  SIZED –  SUBSIZED –  NONNULL –  IMMUTABLE –  CONCURRENT Manage Three Aspects
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.10 Optional<T> !  Used in new Java 8 APIs to replace null !  Indicates that reference may, or may not have a value !  Makes developer responsible for checking Reducing NullPointerException Occurences Optional<GPSData> maybeGPS = Optional.of(gpsData); maybeGPS = Optional.ofNullable(gpsData); maybeGPS.ifPresent(GPSData::printPosition); GPSData gps = maybeGPS.orElse(new GPSData()); maybeGPS.filter(g -> g.lastRead() < 2).ifPresent(GPSData.display());
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.11 java.util.function Package !  Predicate<T> –  Determine if the input of type T matches some criteria !  Consumer<T> –  Accept a single input argumentof type T, and return no result !  Function<T, R> –  Apply a function to the input type T, generating a result of type R !  Plus several more
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.12 Annotations On Java Types !  Annotations can currently only be used on type declarations –  Classes, methods, variable definitions !  Extension for places where types are used –  e.g. parameters !  Permits error detection by pluggable type checkers –  e.g. null pointer errors, race conditions, etc public void process(@notnull List data) {…}
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.13 Concurrency Updates !  Scalable update variables –  DoubleAccumulator, DoubleAdder, etc –  Multiple variables avoid update contention –  Good for frequent updates, infrequent reads !  ConcurrentHashMap updates –  Improved scanning support, key computation !  ForkJoinPool improvements –  Completion based design for IO bound applications –  Thread that is blocked hands work to thread that is running
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.14 Parallel Array Sorting !  Additional utility methods in java.util.Arrays –  parallelSort (multiple signatures for different primitives) !  Anticipated minimum improvement of 30% over sequential sort –  For dual core system with appropriate sized data set !  Built on top of the fork-join framework –  Uses Doug Lea’s ParallelArray implementation –  Requires working space the same size as the array being sorted
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.15 Date And Time APIs !  A new date, time, and calendar API for the Java SE platform !  Supports standard time concepts –  Partial, duration, period, intervals –  date, time, instant, and time-zone !  Provides a limited set of calendar systems and be extensible to others !  Uses relevant standards, including ISO-8601, CLDR, and BCP47 !  Based on an explicit time-scale with a connection to UTC
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.16 Base64 Encoding and Decoding !  Currently developers are forced to use non-public APIs –  sun.misc.BASE64Encoder –  sun.misc.BASE64Decoder !  Java SE 8 now has a standard way –  java.util.Base64.Encoder –  java.util.Base64.Decoder –  encode, encodeToString, decode, wrap methods
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.17 Nashorn JavaScript Engine !  Lightweight, high-performance JavaScript engine –  Integrated into JRE !  Use existing javax.script API !  ECMAScript-262 Edition 5.1 language specification compliance !  New command-line tool, jjs to run JavaScript !  Internationalised error messages and documentation
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.18 Native Memory Usage !  No more tuning PermGen –  PermGen – Artificial memory limitation –  Metaspace – Regular native allocation !  Limited only by process address space !  Can force a limit: -XX:MaxMetaspaceSize=<size> –  Part of the HotSpot, JRockit convergence !  Class data sharing across processes – Experimental feature –  Available on all platforms, -Xshare:[off|on|auto] –  Reduce footprint and startup sharing JDK classes between processes No more “java.lang.OutOfMemoryError: PermGen space”
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.19 Multistep Optimization !  Interpreter " Client Compiler " Server Compiler –  Fast initial compilation –  Keep peak performance –  Enabled by default !  Improve time to performance –  Startup of large applications –  Performance for short running applications Tiered Compilation
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.20 Java EE Application Deployment Tiered Compilation
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.21 JSR 292 - InvokeDynamic !  Complete rewrite of the VM support for JSR 292 –  Improved stability, maintainability and performance !  Lambda –  Avoid repeated calculations during capture –  No allocation for non-capturing Lambdas –  On par or faster than inner classes !  JavaScript Engine – Nashorn –  Incremental inlining of MethodHandle invocations Major Updates
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.22 JavaScript Engine - Nashorn JSR 292 - InvokeDynamic JDK 8 updates double performance of a couple of these
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.23 Java Mission Control
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.24 JavaFX 8 New Stylesheet 24 Caspian vs Modena
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.25 JavaFX 8 !  Customisable –  Configurable key combinations to exit full screen mode –  Ability to prevent user exiting full screen mode Improvements To Full Screen Mode // Set the key combination that the user can use to exit stage.setFullScreenExitKeyCombination(KeyCombination.NO_MATCH); // Setup the click handler so we can escape from full screen Rectangle r = new Rectangle(0, 0, 250, 250); r.setOnMouseClicked(e -> stage.setFullScreen(false)); // Set full screen again stage.setFullScreen(true);
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.26 JavaFX 8 !  New API for printing –  Currently only supported on desktop !  Any node can be printed Printing Support PrinterJob job = PrinterJob.createPrinterJob(printer); job.getJobSettings().setPageLayout(pageLayout); job.getJobSettings().setPrintQuality(PrintQuality.HIGH); job.getJobSettings().setPaperSource(PaperSource.MANUAL); job.getJobSettings().setCollation(Collation.COLLATED); if (job.printPage(someRichText)) job.endJob();
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.27 JavaFX 8 !  DatePicker !  TreeTableView New Controls
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.28 JavaFX 8 !  Gestures –  Swipe –  Scroll –  Rotate –  Zoom !  Touch events and touch points Touch Support
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.29 JavaFX 8 !  Predefined shapes –  Box –  Cylinder –  Sphere !  User-defined shapes –  TriangleMesh, MeshView !  PhongMaterial !  Lighting !  Cameras 3D Support
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.30 Compact Profiles Approximate static footprint goals Compact1 Profile Compact2 Profile Compact3 Profile Full JRE 54Mb 30Mb 16Mb 11Mb [Migration path for CDC, logging and SSL] [Adds XML, JDBC, RMI] [Adds mgmt, naming, more security, compiler support]
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.31 Java SE Public Updates Schedule GA Date Notification of End of Public Updates End of Public Updates Java SE 1.4.2 Feb 2002 Dec 2006 Oct 2008 Java SE 5 May 2004 Apr 2008 Oct 2009 Java SE 6 Dec 2006 Feb 2011 Feb 2013 Java SE 7 July 2011 Mar 2014 April 2015 Java SE 8 Mar 2014 Mar 2016* TBD For details see, http://www.oracle.com/technetwork/java/eol-135779.html * Or later. Exact date TBD.
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.32 Books !  “Java SE 8 for the Really Impatient” (Horstmann) !  “Functional Programming in Java: Harnessing the Power of Java 8 Lambda Expressions” (Subramaniam) !  “Mastering Lambdas: Java Programming in a Multicore World” (Naftalin) !  “Java 8 in Action: Lambdas, Streams, and functional-style programming” (Urma, Fusco, Mycroft) !  “Java 8 Lambdas: Pragmatic Functional Programming” (Warburton) !  “Java in a Nutshell” (Evans, Flanagan)
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.33 Where Next?
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.34 Java 9 And Beyond !  Modularisation of the Java platform –  Project Jigsaw !  Foreign function interface –  Like JNA !  Enhanced volatiles Java Never Stops
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.35
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.36
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.37 Java SE Lifetime Support Policy GA Date Premier Support Extended Support Java SE 1.4.2 Feb 2002 Feb 2010 Feb 2013 Java SE 5 May 2004 May 2011 May 2015 Java SE 6 Dec 2006 Dec 2015 Jun 2018 Java SE 7 July 2011 July 2019 July 2022 Java SE 8 Mar 2014 Mar 2022 Mar 2025 For details see, http://www.oracle.com/support/library/brochure/lifetime-support-middleware.pdf
    • Copyright © 2014, Oracle and/or its affiliates. All rights reserved.38 Java SE Platform enhanced with enterprise-grade features for monitoring, manageability, and analytics. # 24x7 support, offered in 27 local languages # Security updates on older and current releases # Only source for Java SE 6 updates after Feb 2013 # Monitor, manage, and profile Java desktop applications # Enterprise JRE features i.e., Java SE usage tracking Java SE Commercial Products Java SE Suite Java SE Platform hardened for mission critical applications having extreme and predictable computing needs. # Soft real-time deterministic garbage collector for mission critical applications # Memory leak server for dynamic memory leak detection on mission critical production systems Java SE Support Oracle Premier Support for Java SE. # 24x7 support, offered in 27 local languages # Security updates on older and current releases # Only source for Java SE 6 updates after Feb 2013 # Enterprise JRE features i.e., update control Java SE Advanced Desktop and Java SE Advanced