JVM Anatomy Park
"JVM Anatomy Quarks" is the on-going mini-post series, where every post is describing some elementary piece of knowledge about JVM. The name underlines the fact that the single post cannot be taken in isolation, and most pieces described here are going to readily interact with each other. The post should take about 5-10 minutes to read. As such, it goes deep for only a single topic, a single test,
Java Garbage Collection Distilled
Serial, Parallel, Concurrent, CMS, G1, Young Gen, New Gen, Old Gen, Perm Gen, Eden, Tenured, Survivor Spaces, Safepoints, and the hundreds of JVM startup flags. Does this all baffle you when trying to tune the garbage collector while trying to get the required throughput and latency from your Java application? If it does then do not worry, you are not alone. Documentation describing garbage collec
Uber 分散JVMトレースã®JVM Profilerをオープンソースã«
Spring Bootã«ã‚ˆã‚‹APIãƒãƒƒã‚¯ã‚¨ãƒ³ãƒ‰æ§‹ç¯‰å®Ÿè·µã‚¬ã‚¤ãƒ‰ 第2版 何åƒäººã‚‚ã®é–‹ç™ºè€…ãŒã€InfoQã®ãƒŸãƒ‹ãƒ–ック「Practical Guide to Building an API Back End with Spring Bootã€ã‹ã‚‰ã€Spring Bootを使ã£ãŸREST API構築ã®åŸºç¤Žã‚’å¦ã‚“ã 。ã“ã®æœ¬ã§ã¯ã€å‡ºç‰ˆæ™‚ã«æ–°ã—ãリリースã•ã‚ŒãŸãƒãƒ¼ã‚¸ãƒ§ãƒ³ã§ã‚ã‚‹ Spring Boot 2 を使用ã—ã¦ã„る。ã—ã‹ã—ã€Spring Boot3ãŒæœ€è¿‘リリースã•ã‚Œã€é‡è¦ãªå¤‰...
JEP 169: Larval State for Value Objects
Summary Provide JVM infrastructure for working with temporary mutable copies of immutable value objects in Valhalla (JDK-8277163). Goals —-- The following goals are assumed from Project Valhalla: Support user-defined and library-defined abstract data types with performance profiles similar to Java primitive types. Bring the semantics of int and java.lang.Integer closer together. Allow representati
How to profile JVM applications | @lightbend
Hi everyone. One of the Tooling team focus lately has been improvement of the contribution process to sbt. Another thing we’ve been thinking is the performance of sbt. Combining these themes together, I’ve been looking into how guys like Jason Zaugg and Johannes Rudolph profile JVM applications, and this post is my findings. The techniques described here should be applicable to both Java and Scala
日本オラクルãŒä»Šå¾Œã®Javaã®ãƒªãƒªãƒ¼ã‚¹ãƒ¢ãƒ‡ãƒ«ã¨å…¬å¼ãƒã‚¤ãƒŠãƒªã«ã¤ã„ã¦ã‚らãŸã‚ã¦Java Day Tokyoã§èª¬æ˜Žã€‚オラクルã«ã‚ˆã‚‹å…¬å¼ãƒã‚¤ãƒŠãƒªã®ç„¡å„Ÿæä¾›ã¯OpenJDKベース
日本オラクルãŒä»Šå¾Œã®Javaã®ãƒªãƒªãƒ¼ã‚¹ãƒ¢ãƒ‡ãƒ«ã¨å…¬å¼ãƒã‚¤ãƒŠãƒªã«ã¤ã„ã¦ã‚らãŸã‚ã¦Java Day Tokyoã§èª¬æ˜Žã€‚オラクルã«ã‚ˆã‚‹å…¬å¼ãƒã‚¤ãƒŠãƒªã®ç„¡å„Ÿæä¾›ã¯OpenJDKベース 日本オラクルã¯5月18æ—¥ã«éƒ½å†…ã§ã‚¤ãƒ™ãƒ³ãƒˆã€ŒJava Day Tokyo 2018ã€ã‚’開催。åˆå¾Œã«è¡Œã‚ã‚ŒãŸã‚»ãƒƒã‚·ãƒ§ãƒ³ã€ŒJava SE ã®æ–°ã—ã„リリースモデルã€ã§ã€ã‚らãŸã‚ã¦ä»Šå¾Œã®Javaã®ãƒªãƒªãƒ¼ã‚¹ãƒ¢ãƒ‡ãƒ«ã¨é…布ã«ã¤ã„ã¦èª¬æ˜Žã‚’è¡Œã„ã¾ã—ãŸã€‚ 説明ã®åŸºæœ¬çš„ãªå†…容ã¯ã€ä»¥å‰ã®è¨˜äº‹ã€Œæ¥æœˆã«ã¯Java 10ãŒç™»å ´ã—ã€9月ã«ã¯Java 11ãŒç™»å ´äºˆå®šã€‚æ–°ã—ã„リリースモデルを採用ã—ãŸä»Šå¾Œã®Javaã€å…¥æ‰‹æ–¹æ³•ã‚„サãƒãƒ¼ãƒˆæœŸé–“ã¯ã“ã†å¤‰ã‚る（OpenJDKã«é–¢ã™ã‚‹è¿½è¨˜ã‚り） ï¼ Publickeyã€ã¨å¤‰ã‚ã£ã¦ã„ã¾ã›ã‚“。 本記事ã¯ã‚»ãƒƒã‚·ãƒ§ãƒ³ã®å†…容を基ã«ã€ç¾æ™‚点ã§ã®ã‚¹ãƒ†ãƒ¼ã‚¿ã‚¹ã‚’ã‚らãŸã‚ã¦ç¢ºèªã™ã‚‹ã‚‚ã®ã§ã™ã€‚ Javaã¯6カ月ã”ã¨ã®ã‚¿ã‚¤ãƒ ベースã®ãƒªãƒªãƒ¼ã‚¹ã¸
Web Application Server ã‚’å‹•ã‹ã™æ™‚ã® Java8 起動オプションã®ãƒ¡ãƒ¢ - ãã®æ‰‹ã®å¹³ã¯å°»ã‚‚ã¤ã‹ã‚ã‚‹ã•
一般的㪠Web Application Server *1 ã‚’ Java8 ã§å‹•ã‹ã™ã«ã‚ãŸã£ã¦ï¼Œæœ€è¿‘有効ã«ã—ã¦ã„る起動オプションã«ã¤ã„ã¦ãƒ¡ãƒ¢ï¼Ž 何ã‹é–“é•ã£ã¦ã„ãŸã‚Šï¼Œã‚ã‚‹ã„ã¯ã€Œã“ã£ã¡ã®æ–¹ãŒè‰¯ã„ã€ã¿ãŸã„ãªã®ãŒã‚ã‚Œã°æ•™ãˆã¦ä¸‹ã•ã„． -server server mode ã§èµ·å‹•ã•ã›ã‚‹ (指定ã—ãªã„㨠client mode ã«ãªã‚‹å¯èƒ½æ€§ãŒã‚る，マシンスペックã«ã‚ˆã£ã¦ã‚¹ã‚¤ãƒƒãƒã™ã‚‹ï¼Ÿ)． -Djava.net.preferIPv4Stack=true If IPv6 is available on the operating system the underlying native socket will be an IPv6 socket. This allows Java(tm) applications to connect too, and accept connections from,
JVMãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°: G1GCã®ä½¿ã„ã©ã“ã‚ã¨CMS GCã‹ã‚‰ã®ãƒžã‚¤ã‚°ãƒ¬ãƒ¼ãƒˆ
Java7 Update4 (java7u4) ã§æ£å¼ã‚µãƒãƒ¼ãƒˆã•ã‚ŒãŸG1GC(ガベージ・ファーストGC)ã§ã™ãŒã€Java9ã§ã¯ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆGCã«ãªã‚‹ã“ã¨ãŒç¢ºå®šã—ã¦ã„ã¾ã™ã€‚ å‚考: JEP248 ã¾ãŸG1GCã¯ã€CMS GCを長期的ã«ç½®ãæ›ãˆã‚‹ã‚‚ã®ã¨ã—ã¦è¨ˆç”»ã•ã‚Œã¦ã„ã¾ã™ã€‚ ãã“ã§ã€ã©ã®ã‚ˆã†ãªã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ãªã®ã‹çŸ¥ã£ã¦ãŠã„ãŸã»ã†ãŒè‰¯ã•ãã†ãªã®ã§èª¿æŸ»ã—ã¾ã—ãŸã€‚ G1GCãŒå‘ã„ã¦ã„るケース G1GCãŒå‘ã„ã¦ã„ã‚‹ã®ã¯ä¸‹è¨˜ã®ç’°å¢ƒã§ã™ã€‚ ヒープサイズãŒå¤§ããªç’°å¢ƒ(6GB以上) 一時åœæ¢å¯èƒ½æ™‚é–“ãŒã‚·ãƒ“ã‚¢(0.5sec未満) Oracleã® 9 ガベージファースト・ガベージ・コレクタã«ã‚ˆã‚‹ã¨ã€CMS GCã‚‚ã—ãã¯Parallel GCを使ã£ã¦ã„ã¦æ¬¡ã®ã„ãšã‚Œã‹ã«è©²å½“ã—ãŸã‚‰G1GCã¸ã®åˆ‡ã‚Šæ›¿ãˆã‚’検討ã—ã¾ã—ょã†ã¨ã®ã“ã¨ã§ã™ã€‚ Javaヒープã®50%超ãŒãƒ©ã‚¤ãƒ–・データ(≒必è¦ãªãƒ‡ãƒ¼ã‚¿)ã§å ã‚られã¦ã„る。 オブジェクトã®
Nailgun: Insanely Fast Java
Introducing ChatKeeper – For Serious ChatGPT Users Organize, Search, and Keep Your Conversations Forever Designed for researchers, professionals, and anyone who needs a permanent, searchable, local conversation archive fully integrated with their work. Source Background Quick Start Protocol Changelog License JavaDocs Important Update October 14, 2017 Nailgun has been a lot of fun to work on, and i
JVM ã® DNS ã‚ャッシュを制御ã™ã‚‹ - 平常é‹è»¢
JVM (Java 仮想マシン) ã«ã¯ DNS ã®åå‰è§£æ±ºã®çµæžœã‚’ã‚ャッシュã™ã‚‹æŒ™å‹•ãŒå‚™ã‚ã£ã¦ã„る。ã‚ャッシュã™ã‚‹ã ã‘ãªã‚‰ã„ã„ã®ã ã‘ã‚Œã©ã€ã“ã®ã‚ャッシュã§ã¯ DNS ã® TTL を無視ã—ã¦ã‚ャッシュã™ã‚‹ãŸã‚ã€åå‰è§£æ±ºã®çµæžœãŒå¤‰ã‚ã£ã¦ã‚‚ JVM ã‹ã‚‰ã®æŽ¥ç¶šå…ˆãŒåˆ‡ã‚Šæ›¿ã‚ã‚‹ã¾ã§ã«ï¼ˆTTL ã‹ã‚‰æƒ³å®šã•ã‚Œã‚‹æ™‚間以上ã«ï¼‰æ™‚é–“ãŒã‹ã‹ã‚‹ã€ã‚ã‚‹ã„ã¯å…¨ã切り替ã‚らãªã„ã¨ã„ã†ã“ã¨ãŒã‚る。ã“ã®æŒ™å‹•ã‚„ãã®åˆ¶å¾¡ã«ã¤ã„ã¦èª¿ã¹ãŸã®ã§ã€ãã®è©±ã‚’ã™ã‚‹ã€‚ （以下ã®è©±é¡Œã§ã¯ Oracle JDK ãŠã‚ˆã³ OpenJDK を対象ã«ã—ã¦è«–ã˜ã‚‹ã®ã§ã€ãれ以外㮠JVM 実装ã§ã©ã†ãªã£ã¦ã‚‹ã‹ã¯èª¿ã¹ã¦ã„ãªã„。é©ç”¨ã§ãる箇所もã‚ã‚Œã°ãã†ã§ãªã„箇所もã‚ã‚Šãã†ï¼‰ 背景・解説 ã“れらã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå€¤ã¯åå‰è§£æ±ºæˆåŠŸæ™‚㯠セã‚ュリティーマãƒãƒ¼ã‚¸ãƒ£ãƒ¼ãŒã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã•ã‚Œã¦ã„ã‚‹å ´åˆã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå€¤ã¯ -1 (ãšã£ã¨) ã§ã€ã‚»ã‚ュリティーマãƒãƒ¼ã‚¸ãƒ£ãƒ¼ãŒã‚¤ãƒ³ã‚¹ãƒˆãƒ¼
Raspberry Pi 㨠Rundeck 㨠JVM ã®ãƒ‘フォーマンス - ymyzk’s blog
ジョブスケジューラ㮠Rundeck ã‚’ Raspberry Pi ã§å‹•ã‹ã›ã‚‹ã‹ã©ã†ã‹ã‚’実際ã«ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã—ã¦è©¦ã—ã¦ã¿ã¾ã—ãŸï¼Žã¾ãŸï¼ŒOpenJDK 㨠Oracle ã® Java SE ã§ãƒ‘フォーマンスã«é¡•è‘—ãªé•ã„ãŒè¦‹ã‚‰ã‚ŒãŸã®ã§ï¼Œç°¡å˜ã«ãƒ‘フォーマンスを評価ã—ã¦ã¿ã¾ã—ãŸï¼Ž 環境 今回ã®æ¤œè¨¼ã«ä½¿ç”¨ã—ãŸç’°å¢ƒã‚’ç°¡å˜ã«ã¾ã¨ã‚ã¾ã™ï¼Ž Raspberry Pi 3 Model B Rev 1.2 Raspbian 9.1 (stretch) Rundeck 2.10.0 apt ã§Â https://rundeck.bintray.com/rundeck-deb ã‹ã‚‰å°Žå…¥ã—ãŸã‚‚ã® JVM ã®è¨å®š Rundeck を実行ã™ã‚‹éš›ã«åˆ©ç”¨ã™ã‚‹ JVM ã®è¨å®šã¯ /etc/rundeck/profile ã«è¨˜è¿°ã•ã‚Œã¦ã„ã¾ã™ï¼Žãƒ‡ãƒ•ã‚©ãƒ«ãƒˆã®è¨å®šã¯ -Xmx1024m -Xms256m -XX:MaxMetaspaceS
第1回　JVMã¯ã©ã®ã‚ˆã†ã«ãƒ¡ãƒ¢ãƒªç©ºé–“を利用ã™ã‚‹ã®ã‹ | gihyo.jp
ã‚ã®WebサービスもJVMを利用ã—ã¦ã„ã‚‹ 「Javaã¯å¤§è¦æ¨¡ãªã‚¨ãƒ³ã‚¿ãƒ¼ãƒ—ライズシステムã«ã—ã‹ä½¿ã‚ã‚Œãªã„〠ãã‚ŒãŒå¸¸è˜ã ã¨æ€ã£ã¦ã„ã¾ã›ã‚“ã‹ï¼Ÿ ãŸã—ã‹ã«ã€ã“ã‚Œã¾ã§Java Virtual Machine（JVM）ã¯ã€ä»–ã®è¨€èªžã‚’実行ã™ã‚‹ã¨é…ãã€Javaã®ãƒ—ãƒã‚°ãƒ©ãƒ を実行ã™ã‚‹ç’°å¢ƒã«ã™ãŽãªã„ã‚‚ã®ã§ã—ãŸã€‚ã¨ã“ã‚ãŒã€Java 7ã‹ã‚‰å®Ÿè£…ã•ã‚ŒãŸInvokeDynamicã«ã‚ˆã‚Šã€JVM上ã§ã€Rubyã‚„PHPãªã©ã•ã¾ã–ã¾ãªã‚³ãƒ³ãƒ”ュータ言語ã§è¨˜è¿°ã•ã‚ŒãŸãƒ—ãƒã‚°ãƒ©ãƒ をより高速ã«å®Ÿè¡Œã§ãるよã†ã«ãªã‚Šã¾ã—ãŸã€‚ ã“ã‚Œã«ã‚ˆã‚Šã€ä»Šã¾ã§ã‚¨ãƒ³ã‚¿ãƒ¼ãƒ—ライズã§Java言語ã§è¨˜è¿°ã•ã‚ŒãŸãƒ—ãƒã‚°ãƒ©ãƒ を実行ã™ã‚‹ã ã‘ã®ç’°å¢ƒã§ã‚ã£ãŸJVMãŒã€æ±Žç”¨çš„ãªå®Ÿè¡Œç’°å¢ƒã«ãªã£ãŸã¨è¨€ãˆã¾ã™ã€‚ã¾ãŸã€ã“ã‚Œã¾ã§Javaã®å®Ÿè¡Œç’°å¢ƒã¨ã—ã¦ä½¿ç”¨ã•ã‚Œã¦ã„ãŸãƒŽã‚¦ãƒã‚¦ãŒã€ä»–ã®è¨€èªžã§è¨˜è¿°ã•ã‚ŒãŸãƒ—ãƒã‚°ãƒ©ãƒ を実行ã™ã‚‹éš›ã«ã‚‚利用ã§ãã¾ã™ã€‚ 最近ã§ã¯ã€TwitterãŒJVMをアプリケー
メモリリークã€ãƒ‡ãƒƒãƒ‰ãƒãƒƒã‚¯ã€ãƒªãƒ€ã‚¤ãƒ¬ã‚¯ãƒˆãƒ«ãƒ¼ãƒ—ã€JVMクラッシュ...ãƒã‚°ã らã‘ã®Webアプリケーションを使ã£ã¦ãƒã‚°ã‚’ç†è§£ã™ã‚‹ - Qiita
メモリリークã€ãƒ‡ãƒƒãƒ‰ãƒãƒƒã‚¯ã€ãƒªãƒ€ã‚¤ãƒ¬ã‚¯ãƒˆãƒ«ãƒ¼ãƒ—ã€JVMクラッシュ...ãƒã‚°ã らã‘ã®Webアプリケーションを使ã£ã¦ãƒã‚°ã‚’ç†è§£ã™ã‚‹Javaãƒã‚°è„†å¼±æ€§ãƒˆãƒ©ãƒ–ルシューティングjconsole æ¦‚è¦ Webアプリケーションã®é–‹ç™ºã‚„ä¿å®ˆã‚’ã—ã¦ã„ã‚‹ã¨ã€ã„ã‚ã„ã‚ãªãƒã‚°ã«éé‡ã—ã¾ã™ã€‚メモリリークã€ãƒ‡ãƒƒãƒ‰ãƒãƒƒã‚¯ã€ãƒªãƒ€ã‚¤ãƒ¬ã‚¯ãƒˆãƒ«ãƒ¼ãƒ—ã€JVMクラッシュç‰ã€…ã€ãƒã‚°ã¯æ§˜ã€…ã§ã™ã€‚ã“ã†ã„ã£ãŸãƒã‚°ã¯ã€å®Ÿéš›ã«ã‚³ãƒ¼ãƒ‰ã‚’書ã„ã¦ã€å®Ÿè¡Œãƒ»å†ç¾ã•ã›ã¦ãƒ„ールã§è§£æžã—ã¦ã¿ã‚‹ã¨ç†è§£ãŒæ·±ã¾ã‚Šã¾ã™ã€‚ ã¨ã„ã†ã“ã¨ã§ã€ã„ã‚ã„ã‚ãªãƒã‚°ã‚’実装ã—ãŸWebアプリケーションをã¤ãã£ã¦ã¿ã¾ã—ãŸã€‚ç¾æ™‚点ã§ã¯ã€ä»¥ä¸‹ã‚’ç°¡å˜ã«å†ç¾ã§ãã¾ã™ã€‚ メモリリーク (Javaãƒ’ãƒ¼ãƒ—é ˜åŸŸ) メモリリーク (Permanenté ˜åŸŸ) メモリリーク (Cãƒ’ãƒ¼ãƒ—é ˜åŸŸ) デッドãƒãƒƒã‚¯ (Java) デッドãƒãƒƒã‚¯ (SQL) 完了ã—ãªã„プãƒã‚»ã‚¹ã®å¾…æ©Ÿ ç„¡é™ãƒ«ãƒ¼ãƒ— リダイレクトループ JVM
HelloWorldã§å¦ã¶Javaã®ã‚¯ãƒ©ã‚¹ãƒ•ã‚¡ã‚¤ãƒ« - ãã©ãŸã‹ã®ãƒ–ãƒã‚°
暇ã¤ã¶ã—ã«ã‚¯ãƒ©ã‚¹ãƒ•ã‚¡ã‚¤ãƒ«ã«ã¤ã„ã¦èªžã£ã¦ã¿ã‚ˆã†ã€‚ 今回ã®å‹‰å¼·ã®å…ƒã¨ãªã‚‹ã‚½ãƒ¼ã‚¹ã¯ã“ã¡ã‚‰ã€‚ 三分ã§ã‚¯ãƒƒã‚ングã§ãã‚‹ã»ã©ç”˜ããªã„ã§ã™ã‚ˆã€‚ ã“ã®ã‚¨ãƒ³ãƒˆãƒªãƒ¼ã‚’書ãã®ã«å®Ÿéš›ã¯ä¸¸ä¸€æ—¥ã‚‚ã‹ã‘ã¦ãƒ»ãƒ»ãƒ» ãã®æƒ…熱を人æ育æˆã«ä½¿ãˆã£ã¦è©±ã 。 ソース（便宜上ã€è¡Œç•ªå·ã‚’æ·»ãˆã¦ã¾ã™ï¼‰ 1:public class HelloWorld { 2: public static void main(String args) { 3: System.out.println("Hello World!"); 4: } 5:} 上記ã®ã‚½ãƒ¼ã‚¹ã¯ã‚³ãƒ³ãƒ‘イルを終ãˆã‚‹ã¨ã“ã‚“ãªæ„Ÿã˜ã®ãƒã‚¤ãƒŠãƒªã«ãªã‚Šã¾ã—ãŸã€‚ Oracleã§ã‚‚IBMã§ã‚‚åŒã˜ã§ã—ãŸã€‚ 両者ã®javapã«ã‚ˆã‚‹çµæžœã‚‚åŒã˜ã‚‚ã®ã«ãªã‚Šã¾ã—ãŸã€‚ Eclipseã ã¨ãƒã‚¤ãƒŠãƒªã‹ã‚‰ã—ã¦å…¨ç„¶é•ã†ã‚“ã§ã™ã‘ã©ã。 ãƒã‚¤ãƒŠãƒªãƒ•ã‚¡ã‚¤ãƒ« CAFEBABE 00000032 001D0A00 06000F09
Get Your Hands Dirty With Scala JVM Bytecode | Toptal®
The Scala language has continued to gain popularity over the last several years, thanks to its excellent combination of functional and object-oriented software development principles, and its implementation on top of the proven Java Virtual Machine (JVM). Although Scala compiles to Java bytecode, it is designed to improve on many of the perceived shortcomings of the Java language. Offering full fu
Javassist 入門
Java Press vol. 35, pp.76--85, March 2004. Java プãƒã‚°ãƒ©ãƒ ã®"舞å°è£"大追跡 Javassist -- Java ãƒã‚¤ãƒˆã‚³ãƒ¼ãƒ‰ã‚’æ“作ã™ã‚‹ã‚¯ãƒ©ã‚¹ãƒ©ã‚¤ãƒ–ラリ -- 入門 先端J2EE サーãƒJBoss ãŒï¼ŒäººçŸ¥ã‚Œãšå†…部ã§è¡Œã£ã¦ã„ã‚‹ã“㨠åƒè‘‰ã€€æ»‹ æ±äº¬å·¥æ¥å¤§å¦ãƒ»å¤§å¦é™¢æƒ…å ±ç†å·¥å¦ç ”究科 ã¯ã˜ã‚ã« Java ãƒã‚¤ãƒˆã‚³ãƒ¼ãƒ‰ã‚’変æ›ã™ã‚‹ãƒ©ã‚¤ãƒ–ラリã¨ã—ã¦ã¯ Jakarta BCEL ãŒæœ‰åã§ã™ã€‚BCEL 㯠Java クラスファイルã®ãƒ‡ãƒ¼ã‚¿æ§‹é€ を直接æ“作ã™ã‚‹å ´åˆã«ã¯ä¾¿åˆ©ã§ã™ãŒã€Java クラスファイルã®å†…部仕様ã€ã¤ã¾ã‚Š Java ãƒã‚¤ãƒˆã‚³ãƒ¼ãƒ‰ã«è©³ã—ããªã„ã¨ä½¿ã„ã“ãªã›ã¾ã›ã‚“。一方ã€Java ãƒã‚¤ãƒˆã‚³ãƒ¼ãƒ‰ã«ã‚ã¾ã‚Šè©³ã—ããªã„開発者ã§ã‚‚ãƒã‚¤ãƒˆã‚³ãƒ¼ãƒ‰å¤‰æ›ã‚’実装ã§ãるよã†ã«ã™ã‚‹ãƒ©ã‚¤ãƒ–ラリ㌠Javassist ã§ã™ã€‚ ãƒã‚¤ãƒˆã‚³ãƒ¼ãƒ‰å¤‰æ› ã¯ã£ãã‚Šã„ã£ã¦ã€ã¤ã„最近ã¾ã§Java
Javaãƒã‚¤ãƒˆã‚³ãƒ¼ãƒ‰ã®èªã¿æ–¹ - プãƒã‚°ãƒ©ãƒžãƒ¼ã®è„³ã¿ã
Javaã®ãƒ‡ãƒãƒƒã‚°ã‚’ã—ã¦ã„ã¦ã€ã‚¹ãƒ†ãƒƒãƒ—実行ä¸ã«ã‚¹ãƒ†ãƒƒãƒ—インを繰り返ã—ãŸã‚‰ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã®ãªã„ã¨ã“ã‚ã«è¡Œã当ãŸã£ãŸã“ã¨ãŒã‚ã‚‹ã ã‚ã†ã€‚ã‚ã‚‹ã„ã¯Eclipseã§F3ã‚ーã§ã‚¯ãƒ©ã‚¹ã‚„メソッド・フィールドã®å®£è¨€å…ƒã‚’辿ã£ã¦ã„ã£ã¦ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã®ãªã„ã¨ã“ã‚ã«è¡Œã当ãŸã£ãŸã“ã¨ãŒã‚ã‚‹ã ã‚ã†ã€‚ Eclipseã®å ´åˆã€"Class File Editor"ã¨ã„ã†ã‚‚ã®ãŒé–‹ã。ãã“ã«ã¯Javaã®ãƒã‚¤ãƒˆã‚³ãƒ¼ãƒ‰ã®ãƒ‹ãƒ¼ãƒ¢ãƒ‹ãƒƒã‚¯ãŒã‚ºãƒ©ã‚ºãƒ©ã¨ä¸¦ã‚“ã§ã„ã¦ã€ã€Œã“ã‚Œã¯èªã‚ãªã„ã‚„ã€ãƒ¯ã‚±ãŒåˆ†ã‹ã‚‰ãªã„ã€ã¨æŠ•ã’出ã—ã¦ã—ã¾ã£ãŸã‚Šã—ã¦ã„ãªã„ã ã‚ã†ã‹ã€‚ 怖ãŒã‚‹ã“ã¨ã¯ãªã„。ã¡ã‚‡ã£ã¨ã‚³ãƒ„を掴ã‚ã°ã™ãã«èªã‚るよã†ã«ãªã‚‹ã€‚ Class File Editorã®é–‹ãæ–¹ 自å‰ã®Javaクラスã®å ´åˆã€ãƒ“ルドã—ã¦å‡ºæ¥ä¸ŠãŒã£ãŸclassファイルを開ãå¿…è¦ãŒã‚る。"Package Explorer"ã ã¨classファイルã¯éš ã•ã‚Œã¦ã„ã¦è¦‹ãˆãªã„ã®ã§Window -> Sh
JVM Backend and Optimizer in Scala 2.12
JVM Backend and Optimizer in Scala 2.12 Lukas Rytz, Scala Team @ Typesafe Scala 2.12 on one Slide • Move to Java 8: enjoy new VM and library features ↣ Interop for functions: source and bytecode ↣ Make use of default methods ↣ Interop with Java (parallel) streams • New optimizer ↣ Configurable, more reliable, better diagnostics ↣ Fewer bugs (inline trait methods) 2 Agenda • Move to Java 8 ↣ Intero
ランã‚ング
ランã‚ング
ランã‚ング
リリースã€éšœå®³æƒ…å ±ãªã©ã®ã‚µãƒ¼ãƒ“スã®ãŠçŸ¥ã‚‰ã›
最新ã®äººæ°—エントリーã®é…ä¿¡
j次ã®ãƒ–ックマーク
kå‰ã®ãƒ–ックマーク
lã‚ã¨ã§èªã‚€
eコメント一覧を開ã
oページを開ã
見ã›ã¦ã‚„ã‚ã†JVMãŒæŒã¤çœŸã®ãƒã‚«ãƒ©ã‚’ï¼ JVMã®ã‚ªãƒ—ションを一覧ã™ã‚‹æ–¹æ³•ã«ã¤ã„ã¦ã€‚ - Qiita
Why is Java's boolean primitive size not defined?
{{#tags}}- {{label}}
{{/tags}}