JavaOne 2016 Java SE Feedback #jjug #j1jp
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Slide for reporting Java SE Feedback of JavaOne 2016 at Japan Java User Group. Especially, this slide introduces the changes required for Java 9. https://jjug.doorkeeper.jp/events/52639
![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]
Copyright©2016 NTT corporation](https://image.slidesharecdn.com/javaone2016-javasefeedback-161015061642/85/JavaOne-2016-Java-SE-Feedback-jjug-j1jp-22-320.jpg)
![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
Copyright©2016 NTT corporation
Parser 系 い い全滅](https://image.slidesharecdn.com/javaone2016-javasefeedback-161015061642/85/JavaOne-2016-Java-SE-Feedback-jjug-j1jp-34-320.jpg)
![40
• Arrays.asList(x).toArrays() returns Object[]
(JDK-6260652)
• 今 配列 ン(clone) 返 い
• JDK 9 Object[] 返
Behavior changed API
Copyright©2016 NTT corporation
JEP 関係 い API 挙動変更](https://image.slidesharecdn.com/javaone2016-javasefeedback-161015061642/85/JavaOne-2016-Java-SE-Feedback-jjug-j1jp-40-320.jpg)
![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
Copyright©2016 NTT corporation
文 列 性能 永遠 課題](https://image.slidesharecdn.com/javaone2016-javasefeedback-161015061642/85/JavaOne-2016-Java-SE-Feedback-jjug-j1jp-42-320.jpg)
![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
Copyright©2016 NTT corporation
[PR] heap profiler & visualizer HeapStats ！](https://image.slidesharecdn.com/javaone2016-javasefeedback-161015061642/85/JavaOne-2016-Java-SE-Feedback-jjug-j1jp-46-320.jpg)
JavaOne 2016 Java SE Feedback #jjug #j1jp
- 1. JavaOne 2016 Java SE Feedback KUBOTA Yuji @sugarlife <kubota.yuji@gmail.com> NTT OSS Center 2016/Oct/15 Copyright©2016 NTT corporation
- 2. 2 • 公開予定 •写真 撮 Twitter (#jjug #j1jp) ！ •質問 #jjug #j1jp @sugarlife 諸注意 Copyright©2016 NTT corporation
- 3. 3 Who I am Copyright©2016 NTT corporation KUBOTA Yuji (@sugarlife), hard-of-hearing Senior Expert in NTT OpenJDK Author (ykubota) IcedTea Committer
- 7. 7 う い Copyright©2016 NTT corporation 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. 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: Copyright©2016 NTT corporation 今回 題
- 9. Future Java SE Copyright©2016 NTT corporation 9
- 10. 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 Copyright©2016 NTT corporation JavaOne 開催直前 JDK 9 再延長 NEW!
- 11. 11 今年 JDK 9 セ ョン Copyright©2016 NTT corporation 多く 良 あ け状態
- 12. 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 Copyright©2016 NTT corporation HTTP/2 Client jcmd 拡張 あ
- 13. 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 Copyright©2016 NTT corporation 必要最低限 抑え う依 公開先 定義可能
- 14. 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 Copyright©2016 NTT corporation -J-Duser.language=en 確認 う transitive
- 15. 15 Project Kulla (JShell) Copyright©2016 NTT corporation 客様 中 コ 様 い い
- 16. 16 •REPL for Java •Alternatives for Exercise.java ? •CLI framework • https://github.com/YaSuenag/jmxclient Project Kulla (JShell) Copyright©2016 NTT corporation 将来的 jcmd jmx 触 い $ jshell | Welcome to JShell -- Version 9-ea | For an introduction type: /help intro
- 17. 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) Copyright©2016 NTT corporation @okapies 資料 @making 資料 解 い
- 18. 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 Copyright©2016 NTT corporation 型 仲良く う いう
- 19. 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 Copyright©2016 NTT corporation ン あ
- 20. 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 Copyright©2016 NTT corporation Native(あ い CPU) 仲良く う いう
- 21. 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 Copyright©2016 NTT corporation 計算機 (CPU) 使い切
- 22. 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] Copyright©2016 NTT corporation
- 23. 23 Changes required for Java 9 大体影響 あ う Copyright©2016 NTT corporation
- 24. 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 Copyright©2016 NTT corporation 特 利用 影響受け い 確認
- 25. 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 Copyright©2016 NTT corporation Critical APIs JDK 10 以降 削除 可能性あ
- 26. 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 Copyright©2016 NTT corporation Module 化 配置 推奨 いう流
- 27. 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 Copyright©2016 NTT corporation warning: ignoring option XXX; support was removed in 8.0
- 28. 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 Copyright©2016 NTT corporation JDK 9 ビ JDK 5 動 人 居 い ？
- 29. 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 Copyright©2016 NTT corporation 起動時 ョン指定 く
- 30. 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 Copyright©2016 NTT corporation ョン表記 決 打 読 込 影響
- 31. 31 •JDK 構造 ァ 変更 JEP 220: Modular Run-Time Images Copyright©2016 NTT corporation ァ 等 決 打 読 込 影響
- 32. 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 Copyright©2016 NTT corporation Web 動向(NPAPI) セキュ 面 非推奨化 流
- 33. 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 Copyright©2016 NTT corporation コ いう 利用 証明書 問題
- 34. 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 Copyright©2016 NTT corporation Parser 系 い い全滅
- 35. 35 JEP 158: Unified JVM Logging JEP 271: Unified GC Logging Copyright©2016 NTT corporation JJUG CCC 2016 Fall 楽 !(通 言 い)
- 36. 36 Changes required for Java 9 範囲 狭い 刺 痛い Copyright©2016 NTT corporation
- 37. 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 Copyright©2016 NTT corporation JDK 8 非推奨 い API 削除
- 38. 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 Copyright©2016 NTT corporation 関係 多い
- 39. 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 Copyright©2016 NTT corporation 前 ョン い
- 40. 40 • Arrays.asList(x).toArrays() returns Object[] (JDK-6260652) • 今 配列 ン(clone) 返 い • JDK 9 Object[] 返 Behavior changed API Copyright©2016 NTT corporation JEP 関係 い API 挙動変更
- 41. 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 Copyright©2016 NTT corporation いい 前 授け う
- 42. 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 Copyright©2016 NTT corporation 文 列 性能 永遠 課題
- 43. 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 Copyright©2016 NTT corporation 前 ョン 非推奨化 削除 一環
- 44. 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 Copyright©2016 NTT corporation JDK 8 時点 非推奨 非サ
- 45. 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 Copyright©2016 NTT corporation G1 GC 資料(JJUG CCC 2015 Fall) 参考
- 46. 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 Copyright©2016 NTT corporation [PR] heap profiler & visualizer HeapStats ！
- 47. 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 Copyright©2016 NTT corporation jcmd 不幸 減 広 い
- 48. 48 JEP 228: Add More Diagnostic Commands Copyright©2016 NTT corporation 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. 49 影響 あ う 変更 Copyright©2016 NTT corporation 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