Presentation JDK7 Update and Java SE 7

A survey of the key features being developed for JDK 7, by both Sun and non-Sun contributors, followed by a speculative look at potential features for future releases.
Published on: 2009-11-26T12:35:46.000Z
Channel: Devoxx'09 (all)
Tags: Java javase7 devoxx closures 2009 conference JDK7
Speakers:

Mark Reinhold

Mark Reinhold is Chief Architect of the Java Platform Group at Oracle, where he works on the Java Platform, Standard Edition, and OpenJDK. His past contributions to the platform include character-stream readers and writers, reference objects, shutdown hooks, the NIO high-performance I/O APIs, library generification, and service loaders. Mark was the lead engineer for the 1.2 and 5.0 releases and the specification lead for Java SE 6. He is currently leading the Jigsaw and JDK 7 Projects in the OpenJDK Community. Mark holds a Ph.D. in Computer Science from the Massachusetts Institute of Technology.

PDF: slides.pdf

Slides:

JDK 7 & Java SE 7

JDK 7 & Java SE 7 Mark Reinhold Principal Engineer Sun Microsystems http://blogs.sun.com/mr 2009/11/18 — Devoxx 2009

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7 Modular Multi-Lingual Productive Performant 2

JDK Java

JDK Java 1

Image

http://www.flickr.com/photos/viagallery/2290654438 5

6 Image

http://www.flickr.com/photos/ragesoss/2286167023 7

javax.tools javax.lang

javax.tools javax.lang java.dyn javax.annotation java.lang javax.script java.math javax.management java.nio javax.sound MODULARIZE THE java.rmi java.awt JAVA PLATFORM javax.swing java.net … AND APPLICATIONS TOO. java.security javax.net javax.imageio javax.print java.beans java.applet java.text javax.xml org.xml ? org.w3c java.io javax.rmi javax.crypto javax.activation javax.security org.ietf java.util javax.jws javax.naming javax.sql org.omg javax.accessibility java.sql javax.activity javax.transaction 8

Project Jigsaw

Project Jigsaw openjdk.java.net/projects/jigsaw A simple, low-level module system Integrated with the language and VM Applied to the JDK Interoperable with OSGi http://www.flickr.com/photos/lizadaly/2944362379 1

Project Jigsaw

Project Jigsaw openjdk.java.net/projects/jigsaw JSR 294: Improved Modularity Support in the Java Programming Language http://www.flickr.com/photos/lizadaly/2944362379 1

The Modular Java Platform

The Modular Java Platform jdk tools java desktop swing sound awt corba jaxws jaxp base 10

Code

$ java -cp $APPHOME/lib/ jdom-1.0.jar\ :$APPHOME/lib/jaxen-1.0 .jar\ :$APPHOME/lib/saxpath-1.0 .jar\ :$APPHOME/lib/rome-1.0.jar\ :$APPHOME/lib/rome-fetcher-1.0 .jar\ :$APPHOME/lib/joda-time-1.6 .jar\ :$APPHOME/lib/tagsoup-1.2 .jar\ 1

Code

$ java org.planetjdk.aggregator.Main 1

Code

Image

org.planetjdk.aggregator joda-time-1.6 jdom-1.0 jaxen-1.0 saxpath-1.0 tagsoup-1.2 rome-fetcher-1.0 rome-1.0 jaxp-7 java-7 base-7 12

Code

// module-info.java module org.planetjdk.aggregator @ 1.0 { requires jdom @ 1.0; requires tagsoup @ 1.2; requires rome @ 1.0; requires rome-fetcher @ 1.0; requires joda-time @ 1.6; requires jaxp @ 7; org.planetjdk.aggregator-1.0.deb requires base @ 7; class org.openjdk.aggregator.Main; } org.planetjdk.aggregator-1.0.rpm pkg://org.planetjdk.aggregator@0.5.11,1.0:20090602T201234Z 13

Image

http://www.flickr.com/photos/thatguyfromcchs08/2300190277 14

Project Jigsaw

Project Jigsaw openjdk.java.net/projects/jigsaw The Modular Java Platform & Project Jigsaw Thursday 17:50, Room 8 The Modular Java Platform & Project Jigsaw BOF Thursday 20:00, Room 1 15

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Languages on the VM

Languages on the VM Bex Script CAL Zigzag Drools Rexx G Tiger Icon Tcl Logo WebL Luck foo FScript Funnel Scala JudoScript Lisp Forth JRuby C# Pascal Sather Tea Ada Dawn Mini v-language BeanShell JavaFX Script Groovy LLP Basic JavaScript Processing E Yoix Oberon TermWare iScript SALSA Hojo Smalltalk JHCR Jython Prolog Phobos Pnuts Sleep PHP Simkin Eiffel Scheme JESS Correlate Modula-2 ObjectScript Anvil Jickle Clojure Piccola Yassl PLAN Nice Present 17

18 The Da Vinci Machine

The Da Vinci Machine openjdk.java.net/projects/mlvm JSR 292: Supporting Dynamically-Typed Languages on the Java™ Platform (InvokeDynamic) 1

The Da Vinci Machine

The Da Vinci Machine openjdk.java.net/projects/mlvm Toward a Universal Virtual Machine Brian Goetz & Alex Buckley Thursday 10:30, Room 8 1

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7 Modular Multi-Lingual Productive Performant 20

Code

List list = ...; for (Iterator i = c.iterator(); i.hasNext();) { String s = i.next(); ... } 1

Code

List list = ...; for ( String s : c ) { ... } 2

Project Coin (JSR TBD)

Project Coin (JSR TBD) openjdk.java.net/projects/coin Small language changes to simplify everyday tasks http://www.flickr.com/photos/chefranden/908539119/ 22

Code

Map > map = new HashMap<>(); 1

Code

long cc = 4388449999352988L; 4388_4499_9935_2988L; long pn = 16505554963L; 1_650_555_4963L; long zc = 943036639; 94303_6639; int x = 33825; 0x8421; 0b1000010000100001; 0b1000_0100_0010_0001;

Code

List tmp = Arrays.asList(3, 1, 4, 1, 5, 9, 5, 2, 6, 5, 3, 5); List piDigits = Collections.unmodifiableList(tmp) = [ 3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5, 9 ]; Set somePrimes = { 2, 7, 31, 127, 8191, 131071, 524287 }; Set honestPoliticians = { };

Code

Map platonicSolids; static { Map tmp = new LinkedHashMap<>(); tmp.put(4, "tetrahedron"); tmp.put(6, "cube"); tmp.put(8, "octahedron"); tmp.put(12, "dodecahedron"); platonicSolids = Collections.immutableMap(tmp); } = { 4 : "tetrahedron", 6 : "cube", 8 : "octahedron", 12 : "dodecahedron" };

Code

List ls = [ "foo", "bar", "baz", "quux", "huh?" ]; String baz = ls.get(2); = ls[2]; ls.set(4, "rpg"); ls[4] = "rpg"; 27

Code

Map platonicSolids = { 4 : "tetrahedron", 6 : "cube", 8 : "octahedron", 12 : "dodecahedron" }; String octo = platonicSolids.get(8); = platonicSolids[8]; platonicSolids[20] = "icosahedron"; String six = platonicSolids.get(piDigits.get(7)); = platonicSolids[piDigits[7]]; 28

Code

static void copy(File src, File dst) throws IOException { InputStream in = new FileInputStream(src); OutputStream out = new FileOutputStream(dst); try { byte[] buf = new byte[BUFSIZ]; int n; while ((n = in.read(buf)) >= 0) out.write(buf, 0, n); } finally { in.close(); out.close(); } } ✘ 29

Code

static void copy(File src, File dst) throws IOException { InputStream in = new FileInputStream(src); try { OutputStream out = new FileOutputStream(dst); try { byte[] buf = new byte[BUFSIZ]; int n; while ((n = in.read(buf)) >= 0) out.write(buf, 0, n); } finally { out.close(); } } finally { in.close(); } } 30

Code

static void copy(File src, File dst) throws IOException { try (InputStream in = new FileInputStream(src); OutputStream out = new FileOutputStream(dst)) { byte[] buf = new byte[8192]; int n; while ((n = in.read(buf)) >= 0) out.write(buf, 0, n); } } 31

Project Coin (JSR TBD)

Project Coin (JSR TBD) openjdk.java.net/projects/coin Project Coin — Joe Darcy TODAY 17:50, Room 8 http://www.flickr.com/photos/chefranden/908539119/ 32

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Stats

10,000000 1,000,000 100,000 10,000 1,000 100 10 1 Transistors (1,000s) Clock (MHz) 1970 1975 1980 1985 1990 1995 2000 2005 2010 34

Niagara 1 (2005)

Niagara 1 (2005) 8 x 4 = 32 Niagara 2 (2007) 8 x 8 = 64 Rainbow Falls 16 x 16 = 256 35

Code

class MaxFinder { final int[] data; final int start, end; MaxFinder(int[] d, int s, int e) { data = d; start = s; end = e; } MaxFinder(int[] d) { this(d, 0, d.length); } 1

Code

class MaxFinder { final int[] data; final int start, end; int find() { int max = Integer.MIN_VALUE; for (int i = start; i < end; i++) max = Math.max(max, data[i]); return max; } MaxFinder subFinder(int s, int e) { return new MaxFinder(data, start + s, start + e); } 2

Code

class MaxTask extends RecursiveAction { final MaxFinder maxf; int ans; MaxTask(MaxFinder mf) { maxf = mf; } 3

Code

class MaxTask extends RecursiveAction { protected void compute() { int n = maxf.end - maxf.start; if (n < THRESHOLD) { ans = maxf.find(); } else { int m = n / 2; MaxTask left = new MaxTask(maxf.subFinder(0, m)); MaxTask right = new MaxTask(maxf.subFinder(m, n)); invokeAll(left, right); ans = Math.max(left.ans, right.ans); } } 4

Code

class MaxFinder { int find() { ... } MaxFinder subFinder(int s, int e) { return new MaxFinder(data, start + s, start + e); } int parallelFind() { MaxFinderTask mft = new MaxFinderTask(this); ForkJoinPool pool = new ForkJoinPool(); pool.invoke(mft); return mft.result; } 38

Code

class MaxTask extends RecursiveAction { protected void compute() { int n = maxf.end - maxf.start; if (n < THRESHOLD) { // ??? ans = maxf.find(); } else { int m = n / 2; MaxTask left = new MaxTask(maxf.subFinder(0, m)); MaxTask right = new MaxTask(maxf.subFinder(m, n)); invokeAll(left, right); ans = Math.max(left.ans, right.ans); } } 39

Code

ForkJoinPool pool = new ForkJoinPool(); ParallelIntArray pa = ParallelIntArray.create(data, pool); return pa.max(); 40

Code

ParallelIntArray ParallelLongArray ParallelFloatArray ParallelDoubleArray ParallelArray filter map reduce 41

Code

class Student { String name; int graduationYear; double gpa; } Student[] data = ...; ForkJoinPool pool = new ForkJoinPool(); ParallelArray pa = new ParallelArray.create(data, pool); double highestGPA = pa.withFilter(graduatesThisYear) .withMapping(selectGpa) .max(); // ??? // ??? 42

Code

Ops.Predicate graduatesThisYear = new Ops.Predicate() { public boolean op(Student s) { return s.graduationYear == 2008; } }; Ops.ObjectToDouble selectGpa = new Ops.ObjectToDouble() { public double op(Student student) { return student.gpa; } }; 43

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N I T O 7 N K D J 44

THE CALCULI OF LAMBDA-CONVERSION

THE CALCULI OF LAMBDA-CONVERSION ALONZO CHURCH 45

Simple Closures

Simple Closures Itʼs time to add them to Java. 46

Code

// Function literals #()(42) #(int x)(x + x) #(int x, int y)(x * y) #(int x, int y) { int z = expensive(x, y); if (z > 0) return x; if (z < 0) return y; return 0; } 47

Code

double highestGPA = pa.withFilter(graduatesThisYear) .withMapping(selectGpa) .max(); double highestGPA = pa.filter(#(Student s)(s.graduationYear == THIS_YEAR)) .map(#(Student s)(s.gpa)) .max(); 3

Code

// Function literals #()(42) #(int x)(x + x) #(int x, int y)(x * y) // Function types #int() fortyTwo = #()(42); #int(int) doubler = #(int x)(x + x); #int(int, int) multiplier = #(int x, int y)(x * y); 4

Code

// Function types #int() fortyTwo = #()(42); #int(int) doubler = #(int x)(x + x); #int(int, int) multiplier = #(int x, int y)(x * y); assert fortyTwo() == 42; assert doubler(fortyTwo()) == 84; assert multiplier(3, 42) == 126; 5

Code

// What about collections? interface Set { public void add(T ob); public void remove(Object ob); ... } public Set map(#S(T) func); import java.util.Set; import java.util.MappableSet extends java.util.Set; ✗ ✗ 6 Set doubleSet(Set s) { return s.map(#(int x)(x + x)); }

The closures design space

The closures design space Function literals Function types Extension methods ✓ Non-local control transfer Capture of non-ﬁnal variables Library-deﬁned control structures 51 ✗

JDK 7

JDK 7 http://openjdk.java.net/projects/jdk7 Java SE 7 http://jcp.org /en/jsr/detail?id=TBD 52

Image

http://www.flickr.com/photos/kozloski/2306510520 53

When?

When? 54

Milestone 1 Milestones Milestone 3 Milestone 4 Milestone 5 Milestone 6 Milestone 7

Milestone 1 Milestone 2 Milestone 3 Milestone 4 Milestone 5 Milestone 6 Milestone 7 2009/02/19 2009/04/02 2009/05/14 JavaOne Preview 2009/07/23 2009/11/12 2009/12/24 2010/02/18 1

Mielstones

☞ Milestone 1 Milestone 2 Milestone 3 Milestone 4 Milestone 5 Milestone 6 Milestone 7 2009/02/19 2009/04/02 2009/05/14 JavaOne Preview 2009/07/23 2009/11/12 Feature Complete 2009/12/24 2010/02/18 2

Milestones

☞ Milestone 1 Milestone 2 Milestone 3 Milestone 4 Milestone 5 Milestone 6 Milestone 7 2009/02/19 2009/04/02 2009/05/14 JavaOne Preview 2009/07/23 2009/11/12 Feature Complete 2009/12/24 2010/02/18 Release Candidate 3

Milestones

☞ Milestone 1 Milestone 2 Milestone 3 Milestone 4 Milestone 5 Milestone 6 Milestone 7 Milestone 8 Milestone 9 Milestone 10 2009/02/19 2009/04/02 2009/05/14 JavaOne Preview 2009/07/23 2009/11/12 2010/02/18 2010/04/15 2010/06/03 Feature Complete 2010/07/22 2010/09/09 4

G1 Garbage Collector

G1 Garbage Collector Project Jigsaw + JSR 294 Scalar Replacement Concurrency & TimSort collections updates Dual-Pivot Quicksort Sockets-Direct Protocol Elliptic-Curve Cryptography Stream-Control Transmission Protocol Compressed Pointers XRender 2D Pipeline InvokeDynamic (JSR 292) More New I/O APIs (JSR 203) Swing JLayer Parallel class loaders Project Coin (JSR TBD) Unicode 5.1 Swing Nimbus Look-and-Feel Fork/Join + Closures Type Annotations (JSR 308) 56

Available today!

Available today! openjdk.java.net/projects/jdk7 download.java.net/jdk7/m5 57

Questions?

The Concurrency Revolution — Brian Goetz TODAY 14:00, Room 4 TODAY 17:50, Room 8 TONIGHT 20:00, Room 2 Project Coin — Joe Darcy JDK 7 & Java SE 7 BOF Toward a Universal VM — Brian Goetz & Alex Buckley Thursday 10:30, Room 8 Thursday 17:50, Room 8 The Modular Java Platform & Project Jigsaw Questions? 58