what’s new file... touraine tech make java innovative again! 19 2017 jan feb mar apr may jun jul...

What’s new

with Java >=9?

Don’t be afraid of Jigsaw!

| JF James | © Worldline | Touraine Tech

A few words about me

2

Lille

Lyon

Blois Tours

Rennes

blog.worldline.tech


Agenda

3


A brief history of Java

4

1.0 1.1

1.2 1.3

1.4 5.0

6

7

8

JDK distribution size (compressed MB)

Release date (y)

| JF James | © Worldline | Touraine Tech 5 5

Refresher on Java SE 8

Released on 18 March 2014

Functional & asynchronous programming

New Date Time API

Streams

Method reference

Lambda expression

Optional CompletableFuture

Collectors


Ready for Java 9?

More than 80 changes

Multi-release Jar file Reactive Streams API


Expected benefits of the JDK modularity

7

Security

Maintenance

Scalability

Robustness Performance

Innovation


The long story of Java Modularity

8

Started in 2005 (JSR 277), released in September 2017 (JSR 376)


Discovering JPMS

Java native modular system

Makes modules explicit

Modularize the JDK itself

Open to Java Applications

9

Strong encapsulation by exporting or opening

packages

Explicit and reliable

dependencies


The new look of the JDK

10


How efficient is the JDK modularity?

11

0

5 000

10 000

15 000

20 000

25 000

30 000

35 000

With modularity


Opening packages

12

module easytext.gui { opens easytext.gui to javafx.graphics; requires javax.graphics; }

import java.fx.Application; public class MyApp extends Application { public static void main(String … args) { Application.launch(args); } }


Modular Java Services

13

Provider: module easytext.analysis.coleman { provides easytext.analysis.api.Analyser with easytext.analysis.coleman.ColemanAnalyser; }

Consumer: module easytext.analysis.client { uses easytext.analysis.api.Analyser; } … ServiceLoader.load(Analyzer.class);


Welcome to the modulepath!

14

Modular JDK

Legacy App

Classpath-based

Modular App

Modulepath-based

Under your control

Out of your control

Already modular

Legacy Frameworks & libraries

Modular Frameworks & libraries


On the road to application modularity

15

classpath modulepath

file.jar file.jar file.jar

module info

Legacy jar

Part of the unnamed module Everything exported & opened Can access everything (1)

--illegal-access allowed

Module name derived (2) or defined (3)

Everything exported & opened Can access everything (1)

–add-opens & add-exports allowed

Automatic module Explicit module

Explicit access to other modules Classpath unreadable

(1) From the classpath&modules (2) From the jar file name (3) Using Automatic-Module-Name (MANIFEST.MF)


Naming modules

16

Use Automatic-Module-Name to define a stable name for library modules No version number in module name


Just enough runtime with JLink

Creating custom "Java Images" for your applications


Oracle new strategy

18

• The Reference Implementation • Including previous commercial features • Pure Open Source • GPL V2 + Class Path extension • Free of use and distribution • Time-driven release model

• 100% OpenJDK based • Commercial offering • Long Term Support


Make Java innovative again!

19

2017 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

OpenJDK 9


Feature OpenJDK 10.0 11.0

Update OpenJDK 10.0.1 10.0.2 11.0.1

LTS Oracle JDK 11.0 LTS



Update OpenJDK 11.0.2 12.0.1 12.0.2 13.0.1

LTS Oracle JDK



Update OpenJDK 13.0.2 14.0.1 14.0.2 15.0.1

LTS Oracle JDK

Eof JDK8

Eof JDK8


Challenges ahead of us

• Should I run my App on Java 9?

– Better performance expected (to be tested)

– Some adaptations needed: command lines, code (minor impact)

– Warning: G1 optimal for heap size >=4GB

• Should I use feature-releases or LTS?

– Eof Oracle JDK 9 support in Jan. 2019

– Feature-releases free of charge, more suited for short lifecycle App with Continuous Deployment in place

– Conversely LTS suited for long lifecycle App

20

2018

2018-2019



• Should I modularize my App?

– Probably no for most legacy Applications

– To be assessed for existing Applications with long-term perspective

– Yes for new applications

– Dev and build tools will help

• Should I deliver a JLink-based custom runtime image in production?

– Probably yes to make the most of modular Applications

– JLink can be part the build chain

– Responsibility of the Runtime delivery moved to Dev

– Good fit with containerization

21

2018-2019

2019



• Last but not least … Training … Experiencing … Knowledge sharing

– Java 9 is not just about fancy Dev features

– It is a game changer!

– Mastering modularity and its subtleties will take time

– It puts back good practices on the stage at the price of an additional complexity

– And don’t forget the other 79 changes ;-)

22

2018-2019-2020 …

Thanks!

23

Appendixes

24


Main references

• Jigsaw Quickstart: http://openjdk.java.net/projects/jigsaw/quick-start

• Oracle JDK9 Migration Guide: https://docs.oracle.com/javase/9/migrate/

• Alex Buckley talk: https://www.youtube.com/watch?v=rfOjch4p0Po

25

http://openjdk.java.net/projects/jigsaw/quick-start




https://docs.oracle.com/javase/9/migrate/

https://docs.oracle.com/javase/9/migrate/

https://www.youtube.com/watch?v=rfOjch4p0Po



https://blog.worldline.tech/


Other interesting references • http://in.relation.to/2017/04/11/accessing-private-state-of-java-9-modules/

• http://in.relation.to/2017/02/13/building-multi-release-jars-with-maven/

• https://www.youtube.com/watch?v=Txsl-K83ygI

• https://cwiki.apache.org/confluence/display/MAVEN/Java+9+-+Jigsaw

• https://blog.frankel.ch/migrating-to-java-9/1/#gsc.tab=0

• https://blog.frankel.ch/migrating-to-java-9/2/#gsc.tab=0

• https://blog.idrsolutions.com/2017/06/java-9-articles-series-index/

• https://blog.senacor.com/unit-testing-with-java-9-jigsaw-and-junit/

• https://stackoverflow.com/questions/46613214/java-9-maven-junit-does-test-code-need-module-info-java-of-its-own-and-wher

• https://issues.apache.org/jira/browse/SUREFIRE-1420

• https://blog.codefx.org/

• https://speakerdeck.com/forax/tu-modules-2#

• https://access.redhat.com/articles/1299013

• http://www.oracle.com/technetwork/java/eol-135779.html

26

http://in.relation.to/2017/04/11/accessing-private-state-of-java-9-modules/















http://in.relation.to/2017/02/13/building-multi-release-jars-with-maven/












https://www.youtube.com/watch?v=Txsl-K83ygI




https://cwiki.apache.org/confluence/display/MAVEN/Java+9+-+Jigsaw




https://blog.frankel.ch/migrating-to-java-9/1/gsc.tab=0
















https://blog.idrsolutions.com/2017/06/java-9-articles-series-index/










https://blog.senacor.com/unit-testing-with-java-9-jigsaw-and-junit/
















https://stackoverflow.com/questions/46613214/java-9-maven-junit-does-test-code-need-module-info-java-of-its-own-and-wher
































https://issues.apache.org/jira/browse/SUREFIRE-1420




https://blog.codefx.org/

https://blog.codefx.org/

https://speakerdeck.com/forax/tu-modules-2







https://access.redhat.com/articles/1299013

https://access.redhat.com/articles/1299013

http://www.oracle.com/technetwork/java/eol-135779.html





Java version history

27

Version Code Name Release date Delta (y) Size (MB) Size Increase

JDK 1.0 Oak janv-96 4

JDK 1.1 févr-97 1,0 9 125%

J2SE 1.2 Playground déc-98 1,8 20 122%

J2SE 1.3 Kestrel mai-00 1,4 24 20%

J2SE 1.4 Merlin févr-02 1,7 38 58%

J2SE 5.0 Tiger sept-04 2,6 40 5%

Java SE 6 Mustang déc-06 2,2 65 63%

Java SE 7 Dolphin juil-11 4,5 130 100%

Java SE 8 Spider mars-14 2,7 151 16%

Java SE 9 sept-17 3,5 304 101%

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