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

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

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

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https://github.com/HeapStats/heapstats

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

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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)

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•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

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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!

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今年 JDK 9 セョン
多く良あけ状態

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•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

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•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

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• 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

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Project Kulla (JShell)
客様中コ様いい

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•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

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•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

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•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

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•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

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•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

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•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

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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]

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大体影響あう

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•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

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•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

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•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

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•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

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•-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？

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•-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

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•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

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

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•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

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•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

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•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

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

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範囲狭い刺痛い

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• 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

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• 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

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•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

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• 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

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• _ 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

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•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

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•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

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• 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

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• 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

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•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 ！

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•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

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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

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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

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い
@sugarlife
kubota.yuji@gmail.com

JavaOne 2016 Java SE Feedback #jjug #j1jp

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