JavaOne 2016 Java SE Feedback #jjug #j1jp

JavaOne 2016
Java SE Feedback
KUBOTA Yuji @sugarlife <kubota.yuji@gmail.com>
NTT OSS Center
2016/Oct/15
Copyright©2016 NTT corporation

2
• 公開予定
•写真撮 Twitter (#jjug #j1jp)
！
•質問 #jjug #j1jp @sugarlife
諸注意

3
Who I am
KUBOTA Yuji (@sugarlife), hard-of-hearing
Senior Expert in NTT
OpenJDK Author (ykubota)
IcedTea Committer

4
https://github.com/HeapStats/heapstats

https://twitter.com/skrb/status/778119996736172033
https://www.flickr.com/photos/yosshi2007/29315365363/in/albu
m-72157672916952542/
5

6
今日方針

7
うい
頑張けい通
愛媛県亀老山望来島海峡大橋 , METI, Creative Commons Attribution 4.0 International License (CC BY 4.0)

8
•Future Java SE
• JDK 9
•Project Jigsaw / JShell / Reactive (Flow API)
• JDK 10 or later
•Project Valhalla / Project Panama
•Changes required for Java 9
Agenda:
今回題

Future Java SE
9

10
JDK 9
JDK9 release reschedule to 2017/3/23 (2015/12/9)
Feature Complete (2016/5/26)
JDK 9 is not (yet) Feature Complete (2016/6/10)
JDK 9 release reschedule to 2017/7/23 (2016/9/20)
JDK 10
Not scheduled
Schedule
JavaOne 開催直前 JDK 9 再延長
NEW!

11
今年 JDK 9 セョン
多く良あけ状態

12
•JDK 9
• Project Jigsaw
•Project Kulla (JShell)
• Reactive Streams Specification (The Flow API)
•JDK 10 or later
• Project Valhalla
• Project Panama
主新機能
HTTP/2 Client jcmd 拡張あ

13
•JAR Hell
•Lack / Conflict / Unsafe internal update
•New container: Module
•Dependency / Exportation / Version
•Separate standard libraries: Module JDK
•jlink: Make Custom JRE
Project Jigsaw
必要最低限抑えう依公開先定義可能

14
• Directives in module-package.java
• requires public <module>
• requires static <module>
• exports private <package>
• @bitter_fox 記事参考
• Many command line options
• 例: -mp -> -p
Difference from JavaOne 2015
-J-Duser.language=en 確認う
transitive

15
Project Kulla (JShell)
客様中コ様いい

16
•REPL for Java
•Alternatives for Exercise.java ?
•CLI framework
• https://github.com/YaSuenag/jmxclient
Project Kulla (JShell)
将来的 jcmd jmx 触い
$ jshell
| Welcome to JShell -- Version 9-ea
| For an introduction type: /help intro

17
•Reactive programming
•依関係( ) 関数組合
•Reactive Streams
•非期標準様ン
• 制御( 溢防止) 相互互換性確保
• https://community.oracle.com/docs/DOC-1006738
Reactive Streams (The Flow API)
@okapies 資料 @making 資料解い

18
•Value types will be simple
•Value types
•Generic Specialization
•Enhanced volatiles
•今年発表 (キンセ )
• JVMLS 2016 あ (映像1, 映像2, 映像3)
Project Valhalla
型仲良くういう

19
•Pure data aggregates that (ideally) should
have no ancillary overhead
•Value types is simple
•Identity lead pointer
•Pointer lead to indirection
•Indirection lead to suffering
Why Project Valhalla
ンあ

20
•A better way to do native interop
•Foreign APIs
•Vectors
•(Array 2.0)
•今年大変更 (経過順調う)
• JVMLS 2016 (映像1, 映像2, 映像3)
Project Panama
Native(あい CPU) 仲良くういう

21
•1000s of vector instructions on x86
• Intel intrinsic instructions
• AVX/AVX2: 〜380
• AVX-512: 〜3800
•How to bind to particular machine
instructions in the implementation?
Why Project Panama
計算機 (CPU) 使い切

22
Changes required for Java 9
主出典:
openjdk.java.net/projects/jdk9
JavaOne 2016 Sessions:
Preparing for JDK 9:
The Sharp Edges [CON6171]
JDK 9 Language, Tooling,
and Library Features [CON2497]

23
大体影響あう

24
•大半内部 API セ化(隠蔽)
•JDK 9 コンョン回避可能
•広く使わい物(Critical API) 代替用
意公開
•jdeps 使影響あ確認推奨
• 特 Multi-Release JAR files (JEP 238, JDK 9)
JEP 260: Encapsulate most internal APIs
特利用影響受けい確認

25
•Critical APIs (keep public)
• sun.misc.Unsafe
•sun.misc.{Signal,SignalHandler}
• sun.misc.Cleaner
• sun.reflect.Reflection::getCallerClass
• sun.reflect.ReflectionFactory
• 以外削除(隠蔽)
JEP 260: Encapsulate most internal APIs
Critical APIs JDK 10 以降削除可能性あ

26
•Endorsed-standards override and Extension
mechanism has been dropped
•-Xbootclasspath, -Xbootclasspath/p,
-Dsun.boot.class.path has been removed
• 参考：検索方法(JDK 8)
• AppClassLoader URLClassLoader ンン
無く (継承い)等影響
Change class loaders mechanism in JEP
261: Module System
Module 化配置推奨いう流

27
•JDK 8 削除済 or 非推奨ョン
使場合警告セ出け
(無視起動 )
•JDK 9 場合起動
•JDK 8 非推奨ョン削除
(例: Perm 世代ョン)
Unrecognized VM options fail to start
warning: ignoring option XXX; support was removed in 8.0

28
•-source / -target 3 世代前サ
•JDK 9 場合 1.6 1.5 drop
JEP 182: Policy for Retiring javac –
source and –target options
JDK 9 ビ JDK 5 動人居い？

29
•-version: コンンョン削除
•-version く : 付く方
•JAR Manifest JRE-Version 削除
JEP 231: Remove Launch-Time JRE
Version Selection
起動時ョン指定く

30
•1.8.0_101-b14
•1.$MAJOR.0_$MINOR-b$BUILD
•9.1.2+62
•$MAJOR.$MINOR.$SECURITY+$BUILD
•java.specification.version
•1.8 9-ea (GA 後 9 )
JEP 223: New Version String Scheme
ョン表記決打読込影響

31
•JDK 構造ァ変更
JEP 220: Modular Run-Time Images
ァ等決打読込影響

32
•JEP 289: Deprecate the Applet API
• java.applet.{AppletStub,Applet,AudioClip,Apple
tContext}
• javax.swing.JApplet
•Fix insecure issues
•Remove support for serialized applets (JDK-8074161)
• No longer allow non-strict JNLP Parsing (JDK-8075605)
Follow the evolution of WEB
Web 動向(NPAPI) セキュ面非推奨化流

33
•JEP 229: Create PKCS12 Keystores by Default
•keystore type JKS PKCS12 変更
•JEP 288: Disable SHA-1 Certificates
• X.509 証明書ン SHA-1 署利用い
場合注意
Improve encryption for security
コいう利用証明書問題

34
•従来 JVM 廃止ョン
変更
• く使わいョン変更例
• -XX:+PrintGCDetails -Xloggc:gc.log.`date +%Y-
%m-%d_%H-%M-%S` -XX:+PrintGCTimeStamps
• -Xlog:gc*=debug:gc.log.%t:time,level
• -Xlog:[<selection>]:[<output>]:[<decorators>]
JEP 158: Unified JVM Logging
JEP 271: Unified GC Logging
Parser 系いい全滅

35
JEP 158: Unified JVM Logging
JEP 271: Unified GC Logging
JJUG CCC 2016 Fall 楽 !(通言い)

36
範囲狭い刺痛い

37
• java.util.logging.LogManager
#{add|remove}PropertyChangeListener
• java.util.jar.Pack200.{Packer|Unpacker}#
{add|remove}PropertyChangeListener
• com.sun.security.auth.callback.DialogCal
lbackHandle
Remove deprecated APIs in JEP 162:
Prepare for Modularization
JDK 8 非推奨い API 削除

38
• Toolkit implementers (JDK-8037739)
• java.awt.peer package
• java.awt.dnd.peer package
• Unsupported Apple APIs
• com.apple.eawt, com.apple.eio (JEP 272)
• com.apple.concurrent (JDK-8148187)
• AppleScript scripting engine (JDK-8143404)
• com.sun.codec.jpeg (JDK-8038838)
Removed APIs
関係多い

39
•UnsupportedOperationException 返
• JDK-7059085 (非公開)
•Java SE 1.2 時代非推奨
•Thread.stop() 残
• いえ inconsistent state
留処理危険伴う注意
Thread.stop(Throwable) throw UOE
前ョンい

40
• Arrays.asList(x).toArrays() returns Object[]
(JDK-6260652)
• 今配列ン(clone) 返い
• JDK 9 Object[] 返
Behavior changed API
JEP 関係い API 挙動変更

41
• _ 1文禁止 (JDK-8061549)
• 排除い
• JLS §15.27.1. Lambda Parameters (Java 8)
Disallow _ as a one-character identifier
by JEP 213: Milling Project Coin
いい前授けう

42
•String 化一環内部 (value)
型 char[] byte[] 変更
•1文毎 2byte(UTF-16) 1byte 扱
え 1byte 以外従来通
• 回避内部直接
受け渡意外多い注意
The value field of String is no longer
char[] by JEP 254: Compact Strings
文列性能永遠課題

43
•RMI HTTP proxy
•RMI/JRMP HTTP tunneling
実装削除 (JDK-8155978)
The entire HTTP proxying mechanism of RMI
deprecated in JDK 8 will be removed
前ョン非推奨化削除一環

44
• 以下組合
• DefNew + CMS / iCMS
•ParNew + SerialOld / iCMS
• CMS foreground(s)
• -XX:+UseCMSCompactAtFullCollection
• -XX:+CMSFullGCsBeforeCompaction
• -XX:+UseCMSCollectionPassing
JEP 214: Remove GC Combinations
Deprecated in JDK 8
JDK 8 時点非推奨非サ

45
• Parallel GC G1 GC
•-XX:+UseParallel(Old)GC 従来通
•CMS GC 非推奨化進い
(JEP 291)
JEP 248: Make G1 the Default Garbage
Collector
G1 GC 資料(JJUG CCC 2015 Fall) 参考

46
•JEP 240: hprof
• コ残 Oracle JDK 提供い
•JVM TI BCI コあ非公式扱い
• heapdump jmap/jcmd, profiler VisualVM等
•JEP 241: jhat
• くコ残 experimental 除去
•大半 experimental
Good bye tools by JEP 240 and JEP 241
[PR] heap profiler & visualizer HeapStats ！

47
•jcmd 機能強化
•Java Day Tokyo 2016 @YaSuenag 講演
•JavaOne 2016 講演
•jcmd 自体 Java Casual #2 ！
•http://java-casual.connpass.com/event/42461/
JEP 228: Add More Diagnostic Commands
jcmd 不幸減広い

48
JEP 228: Add More Diagnostic Commands
Domain Num. Abstract
PerfCounter 1 - Performance Counter
ManagementAgent 4 +1 JMX agent
Thread 1 - Thread dump
GC 8 +2
-1
Heap / GC / Finalization
VM 15 +8 Runtime info. (log/native mem/flag/etc.)
Compiler 7 - JIT Compiler
JVMTI 2 - JVMTI agent
Removed GC.rotate_log to VM domain
一覧感

49
影響あう変更
影響度合い掴い
• Windows 32 Client VM 廃止
• Unicode CLDR (JEP 252)
• -Djava.locale.providers=JRE,SPI 従来通
• JavaDB (Apache Derby) 廃止 (JDK-8004716)
• Property file UTF-8 利用可能(JEP 226)
• ResourceBundle API UTF-8 読込
• StringBuilder::append 生成コ変更 (JEP 280)
• invokedynamic 利用 JDK library function ぶう

50
い
@sugarlife
kubota.yuji@gmail.com

JavaOne 2016 Java SE Feedback #jjug #j1jp

More Related Content

What's hot

Similar to JavaOne 2016 Java SE Feedback #jjug #j1jp

More from Yuji Kubota

JavaOne 2016 Java SE Feedback #jjug #j1jp