This deck presents what Java 9 brings and what goes away. Also, very high level what you need to do to be prepared.

1. Java 9 Features

2. Mayank Patel
Application Architect - Oildex, a service of Transzap
/Linkedin @maxy_ermayank

3. Countdown to Java 9 Release Date
Update: Jigsaw Delays Push Java 9 Launch Date to 2017 - Read more
Days until Java 9 is officially released
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2 2 6
11.8.2014
First Features Announced
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3.12.2014
4.5.2015
May the 4th Be With You
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26.5.2016
11.8.2016
All Tests Run
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20.10.2016
26.1.2017
Release Candidate
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23.3.2017
What Is project Jigsaw?
The primary goals of this Project are to:
Make the Java SE Platform, and the JDK, more easily scalable down
to small computing devices;
Improve the security and maintainability of Java SE Platform
Implementations in general, and the JDK in particular;
Enable improved application performance; and
Make it easier for developers to construct and maintain libraries
and large applications, for both the Java SE and EE Platforms.

4. New Features

5. Features I am excited about
Java + REPL = jshell
Microbenchmarks are coming (Module system)
Will G1 be the new default garbage collector? (There are four
Garbage Collectors)
HTTP 2.0 is the future
The process API just got a huge boost

6. REPL = JShell
REPL
Jshell

7. Microbenchmarks are coming
JMH
Microbenchmark Suite

8. Will G1 be the new default garbage
collector?
Garbage Collectors - Serial vs. Parallel vs. CMS vs. G1 (and what’s
new in Java 8)
Make G1 the Default Garbage Collector

9. HTTP 2.0 is the future
HTTP/2 Client

10. The process API just got a huge boost
Process API Updates

11. Modular Run-Time Images
The State of the Module System
Faster startup, smaller footprint

14. Example
module fi.solita.blogster {
requires fi.solita.iotdriver;
requires java.sql;
exports fi.solita.blogster.alpha;
exports fi.solita.blogster.beta;
}

15. Versioning Example
module .solita.crawlingturtle @ 0.1 {
requires fi.solita.noisebox @ 1.2;
}

16. Module vs Package Dependency

17. Light Weight JSON API. Money and Currency API

18. _ no longer allowed as a one-character identi er

19. New Version-String Scheme

20. Java Dependency Analysis Tool

21. What is Going Away?
Disable SHA-1 Certi cates

22. What can you do to prepare?
Check code for usages of JDK-internal APIs with jdeps
Check code that might be sensitive to the version change
Check code for uses of underscore as an identi er
If you develop tools then check code for a dependency on rt.jar or
tools.jar or the runtime-image layout
Test the JDK 9 EA builds and Project Jigsaw EA builds

23. How and When I can access ?

24. JDK™ 9 Early Access Releases

25. Resources
Project jigsaw: Talks
Benjamin Schimd Talk
Examples

26. Thank You!