Home | SDKMAN! the Software Development Kit Manager
The Software Development Kit ManagerMeet SDKMAN! – your reliable companion for effortlessly managing multiple Software Development Kits on Unix systems. Imagine having different versions of SDKs and needing a stress-free way to switch between them. SDKMAN! steps in with its easy-to-use Command Line Interface (CLI) and API. Formerly known as GVM, the Groovy enVironment Manager, SDKMAN! draws inspir
staticãªå†…部クラスã¯å†…部クラスã˜ã‚ƒã‚ãªã„ - Fight the Future
From Javaé‚―プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã‚’極ã‚ã‚‹åŒ ã®æŠ€ 作者: Robert Simmons Jr.,ç¦é¾èˆˆæ¥,ä½è—¤ç›´ç”Ÿ,木下哲也,石井å²å出版社/メーカー: オライリージャパン発売日: 2004/10メディア: å˜è¡Œæœ¬è³¼å…¥: 9人 クリック: 116回ã“ã®å•†å“ã‚’å«ã‚€ãƒ–ãƒã‚° (83件) を見る 後輩ã«å†…部クラスã®ã“ã¨ã‚’èžã‹ã‚Œã¾ã—ãŸã€‚ã¡ã‚‡ã£ã¨ã¾ã¨ã‚。 内部クラスã¨å‘¼ã¶ãŸã‚ã«ã¯å¤–部クラスã®ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹å¤‰æ•°ã«ã‚¢ã‚¯ã‚»ã‚¹ã§ããªã„ã¨ã„ã‘ãªã„。ã¤ã¾ã‚Šã€å†…部クラスã¯å¤–部クラスã®ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹å¤‰æ•°ã‚’扱ãˆã‚‹ã€‚ ã¾ãšã¯æ™®é€šã®å†…部クラス。 public class OuterClass { private String instanceVariable = "test"; public static void main(String[] args) { OuterClass outerClass = new Outer
Optimizing Java CMS garbage collections, its difficulties, and using JTune as a solution
Optimizing Java CMS garbage collections, its difficulties, and using JTune as a solution Introduction Let's say you are running Java in a production environment, and one of the instances that plays a critical role fell out of SLA. What do you do? Java tuning has a history of shotgun-approach techniques to recover the service, but what if you had a tool that could: Tell you what the JVM is doing in
java.lang.OutOfMemoryError #渋谷java
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JVMçš„ãªä½•ã‹@JVM Operation Casual Talk
ヒープストラクãƒãƒ£ã®åŸºæœ¬ 予 ç´„ 予 ç´„ 予 ç´„ Permanent GeneraAon (Class, システム) Old GeneraAon Eden Young GeneraAon From(S0) TO(S1) •  Young  Generation •  æ–°è¦ã§â½£ç”Ÿæˆã•ã‚ŒãŸã‚ªãƒ–ジェクトã®â¼Šå…¥ã‚‹ã‚¹ãƒšãƒ¼ã‚¹ •  Eden,  Survivor(S0  and  S1) •  Old  Generation •  より⽣生å˜æœŸé–“ã®â»‘⾧長ã„オブジェクトã®â¼Šå…¥ã‚‹ã‚¹ãƒšãƒ¼ã‚¹ •  Permanent  Generation(Java8ã§Metaspaceã¸) •  クラスやメソッド/Code  CacheãŒâ¼Šå…¥ã‚‹ã‚¹ãƒšãƒ¼ã‚¹
Post by @alexey-palazhchenko · 1 image
Centralized logging is definitely not a new problem. syslogd was in use for ages, receiving your loosely-structured data over a loosely-defined protocol. Then some new implementations appeared, most notably syslog-ng and rsyslog. Then such cloud services as Splunk and Loggly arrived. Even syslog protocol is now more specific. But some parts are still missing: for example, simple but powerful web i
Netty ã®åŸºæœ¬ - hozumiã®æ—¥è¨˜
ã“ã“æ•°æ—¥ã€Nettyã«ã¤ã„ã¦èª¿ã¹ã¦ã„ãŸã®ã§ç†è§£ã§ããŸã“ã¨ã‚’書ãã¾ã™ã€‚ JBoss Netty Netty 㯠Java ã§éžåŒæœŸã€ã‚¤ãƒ™ãƒ³ãƒˆé§†å‹•ã®ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã‚¢ãƒ—リを作るãŸã‚ã®ãƒ•ãƒ¬ãƒ¼ãƒ ワークã§ã™ã€‚Netty を使ã†ã¨æ—©ãã¦ç°¡å˜ã«ãƒã‚¤ãƒ‘フォーマンスã€ãƒã‚¤ã‚¹ã‚±ãƒ¼ãƒ«ã§ãƒ¡ãƒ³ãƒ†ãƒŠãƒ³ã‚¹æ€§ãŒã„ã„ã‚‚ã®ãŒä½œã‚Œã¾ã™ã€‚ã„ã„ã¨ã“å–ã‚Šã®å…¨éƒ¨ä¹—ã›ã§ã™ã€‚ ãªãœãƒã‚¤ãƒ‘フォーマンスã€ãƒã‚¤ã‚¹ã‚±ãƒ¼ãƒ«ã‹ï¼Ÿ Netty 㯠Java NIO(New I/O)をラップã—ã¦ã„ã¦ã€ãƒŽãƒ³ãƒ–ãƒãƒƒã‚ングãªIOæ“作ãŒã§ãã¾ã™ã€‚ãã®ãŸã‚ã€1ã¤ã®ã‚³ãƒã‚¯ã‚·ãƒ§ãƒ³ã«ãšã£ã¨1スレッドを割り当ã¦ã‚‹å¿…è¦ãŒãªã„ãŸã‚効率ã®ã‚ˆã„リソース消費をã—ã¾ã™ã€‚従æ¥ã®ãƒ–ãƒãƒƒã‚ングãªOIO(Old I/O)もサãƒãƒ¼ãƒˆã—ã¦ãŠã‚Šã€åƒ…ã‹ãªå¤‰æ›´ã§å¥½ããªæ–¹ã‚’使ãˆã¾ã™ã€‚ã¾ãŸã€NIOã®è¤‡é›‘ãªByte Bufferã‚’ChannelBufferã¨ã„ã†ã‚ªãƒ–ジェクトã«æŠ½è±¡åŒ–ã—ã€ä¸å¿…è¦ãªã‚³ãƒ”ーãŒç™ºç”Ÿã—ãªã„
The First Play! meetup in Japan - ikeike443ã®ãƒ–ãƒã‚°
The Play! meetup in Japan was held at Kronos co., LTD's seminar room on 6 Aug. 2011. It might be the first time about play meetup in Japan. I went to this meetup and talked about play good points I felt while using for work. My slide is this: Play ja kansai View more presentations from Takafumi Ikeda I hope it was help and great info for those who bored about Java EE and Servlet programming. Play!
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JVM上㮠WebSocket サーãƒãƒ¼ãƒ—ãƒã‚°ãƒ©ãƒ - Jetty, Grizzly, Netty, EM-WebSocket を試㙠- ãªã‚“ã¨ãªã㪠Developer ã®ãƒ¡ãƒ¢
WebSocket ã®ç°¡å˜ãªã‚µãƒ¼ãƒãƒ¼ãƒ—ãƒã‚°ãƒ©ãƒ ã‚’ Jetty, Grizzly, Netty, EM-WebSocket ã‚’ãã‚Œãžã‚Œä½¿ã£ã¦ã€Groovy ã‚„ JRuby ã§å®Ÿè£…ã—ã¦ã¿ã¾ã—ãŸã€‚ WebSocket ã®ãƒ—ãƒãƒˆã‚³ãƒ«ä»•æ§˜ã¯ç¢ºå®šã—ã¦ãŠã‚‰ãšã€äº’æ›æ€§ã®ç„¡ã„改訂ãŒè¡Œã‚ã‚Œã¦ã„るよã†ãªã®ã§ã€ä»Šå›žã¯ draft-ietf-hybi-thewebsocketprotocol-00 をサãƒãƒ¼ãƒˆã—㟠Google Chrome 12.0.742.100 ã® WebSocket クライアントã¨æŽ¥ç¶šå¯èƒ½ãªã‚µãƒ¼ãƒãƒ¼ãƒ—ãƒã‚°ãƒ©ãƒ を作æˆã™ã‚‹äº‹ã«ã—ã¾ã™ã€‚ 実際ã«ã€draft-ietf-hybi-thewebsocketprotocol-00 ã§ä½¿ã† Sec-WebSocket-Key1 㨠Sec-WebSocket-Key2 ã¯ã€draft-ietf-hybi-thewebsocketprotocol-06 ã§ä½¿
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10万行コードèªã‚“ã らJava分ã‹ã‚‹ã‚ˆã£ã¦Twitterã«æ›¸ã„ãŸã‚‰ã™ã’ã‡å‹¢ã„ã§RTã•ã‚ŒãŸã®ã§ã€èª¿åã«ä¹—ã£ã¦æ•æ‰ã‚¨ãƒ³ãƒˆãƒªæ›¸ãよ。 Java Core API JDKインストールã—ãŸãƒ‡ã‚£ãƒ¬ã‚¯ãƒˆãƒªã«å…¥ã£ã¦ã‚‹src.zipを展開ã™ã‚‹ã¨å…¥ã£ã¦ã‚‹ã‹ã‚‰èªã‚€ã¨è‰¯ã„よ。 ã™ãè¿‘ãã«ã‚ã‚‹ã®ã‹ã‚‰èªã‚€ã£ã¦ã®ã¯ãƒ¡ãƒ³ã‚¿ãƒ«çš„ã«æ¥½ã§ã„ã„。 厳密ã«ã¯OSSã˜ã‚ƒãªãã¦å˜ã«å…¬é–‹ã•ã‚Œã¦ã‚‹ã£ã¦ã ã‘ãªã‚“ã ã‘ã©ã‚‚ã€Javaプãƒã‚°ãƒ©ãƒžãªã®ã«ã‚³ã‚¢APIã®ã‚³ãƒ¼ãƒ‰èªã‚“ã§ãªã„ã¨ã‹ç„¡ã„よã？ ã©ã‚Œã‹ã‚‰èªã‚ã°è‰¯ã„ã‹åˆ†ã‹ã‚‰ã‚“ã‹ã£ãŸã‚‰ã€ java.lang java.util java.io java.text 辺りをã¾ãšã¯ã‚ãƒãƒ³ã¨ç†è§£ã™ã‚‹ã“ã¨ã€‚当然コードをèªã¿çµ‚ã‚ã£ãŸã‚‰ã€ãれを使ã£ã¦ã‚³ãƒ¼ãƒ‰ã‚’書ã事。 OpenJDK http://hg.openjdk.java.net/jdk7/jdk7 OpenJDKã‚’èªã‚€ã“ã¨ã§ã€ãƒ—ãƒã‚°ãƒ©ãƒ 言語ã—ã¦ã®Javaã§ã¯ãª
C500k in Action at Urban Airship
Mike Herrick SVP of Product & Engineering Published on 24 Aug 2010 Like the idea of working on large scale problems? We’re always looking for talented engineers, and would love to chat with you – check it out! Building AirMail Push for Android’s Infrastructure We’ve been working to develop AirMail Push for Android, our push platform, along with a supporting server-side infrastructure that can hand
wise9 › Javaã¨JavaScriptã®20年戦争
モãƒã‚¤ãƒ«ã‚²ãƒ¼ãƒ 物凄ã„å‹¢ã„ã§å‹ƒèˆˆã—ãŸãƒ¢ãƒã‚¤ãƒ«ã‚²ãƒ¼ãƒ æ¥ç•Œã¯ã€ã„ã‚ã„ã‚ãªèª²é¡Œã‚„å•é¡Œã«ç›´é¢ã—ãªãŒã‚‰ã‚‚巨大化ã—ã€ä»Šæ—¥ã®æ™‚点ã§ã®ã‚¹ãƒžãƒ¼ãƒˆãƒ•ã‚©ãƒ³å‘ã‘ゲームã®å¸‚å ´ã¸ã¨ç¶™æ‰¿ã•ã‚Œã¦ã„ãã¾ã™ã€‚ モãƒã‚¤ãƒ«ã‚²ãƒ¼ãƒ ã®æ´å² 2001 Javaアプリã¨3Dゲームã®ç™»å ´ JavaãŒåˆ©ç”¨ã§ãるよã†ã«ãªã£ãŸã“ã¨ã«ã‚ˆã‚Šã€ãƒ€ã‚¦ãƒ³ãƒãƒ¼ãƒ‰åž‹ã®ã‚²ãƒ¼ãƒ ãŒä¾›çµ¦ã§ãるよã†ã«ãªã‚Šã¾ã—ãŸã€‚ 2002 æºå¸¯é›»è©±ç«¯æœ«ã®å¤§å®¹é‡åŒ–・3D化競争 Javaæ載æºå¸¯é›»è©±ç«¯æœ«ãŒç™»å ´ã—ã¦ã‹ã‚‰ã”ã僅ã‹1å¹´ã®é–“ã«ã€ã‚¢ãƒ—リã®ã‚µã‚¤ã‚ºã«é–¢ã—ã¦ã¯10å€ã«åºƒå¤§åŒ–ã—ã€è¡¨ç¾æ–¹æ³•ã‚‚2Dã‹ã‚‰3Dã«ã‚·ãƒ•ãƒˆã—始ã‚ã¾ã—ãŸã€‚J-PHONEã¯ã€Žã‚¼ãƒ“ウスã€ã‚„『スペースãƒãƒªã‚¢ãƒ¼ã€ãªã©ã¨ã„ã£ãŸæ˜”ã®ã‚¢ãƒ¼ã‚±ãƒ¼ãƒ‰ã‚²ãƒ¼ãƒ ã‚’ã€ãƒ‰ã‚³ãƒ¢ã¯SIMCITYãªã©ãƒ‘ソコンã§ä¸–界的è¦æ¨¡ã®ãƒ’ットを飛ã°ã—ãŸã‚²ãƒ¼ãƒ を主力商å“ã¨ã—ã¦ã„ã¾ã—ãŸã€‚ 2003 モãƒã‚¤ãƒ«ã‚²ãƒ¼ãƒ ã®ä¸€èˆ¬åŒ– メモリã®åˆ¶é™ãŒåŽ³ã—ã„Java仮想マシン上ã§ã¯ãªãã€OS
クラウド時代ã®æ–°ã—ã„ソートアルゴリズムTask Queue Sortを発明ã—ã¾ã—ãŸ. - kissrobberã®æ—¥è¨˜
Task Queue Sortã¯, Google App Engineã®ä¸¦åˆ—処ç†ã®ä»•çµ„ã¿TaskQueueを使ã£ã¦ã‚½ãƒ¼ãƒˆå‡¦ç†ã‚’è¡Œã†,クラウド時代ã®æ–°ã—ã„ソートアルゴリズムã§ã™. （クラウドソートã¨ã‚‚言ã†ï¼‰ ãƒã‚¿å…ƒ http://d.hatena.ne.jp/gfx/20110519/1305810786 http://www.yuyak.com/1339 http://togetter.com/li/137698 é‡è¦ãªä»•æ§˜ ソートã—ãŸçµæžœã®ã‚½ãƒ¼ãƒˆé †ã¯ä¿è¨¼ã•ã‚Œãªã„. ãŸã¾ã«ã‚½ãƒ¼ãƒˆå¯¾è±¡ã®è¦ç´ ãŒå¢—ãˆã‚‹äº‹ãŒã‚ã‚‹. Java(slim3)ã§ã®å®Ÿè£…例 TaskQueueを投ã’ã‚‹å´ public class IndexController extends Controller { @Override public Navigation run() throws Exception { addToQue
A Digest of Evernote’s Architecture | Evernote
Evernote Tech A Digest of Evernote’s Architecture Dave Engberg • 05/17/2011 Let’s get things started with a coarse-grained overview of the physical makeup of the Evernote service. I won’t go into a lot of detail on each component here; we’ll aim to talk about the interesting bits in separate posts later. Starting at the top-left corner of the diagram, all stats as of May 17th, 2011 … Networking: V
Troubleshooting response time problems – why you cannot trust your system metrics - High Scalability -
Production Monitoring is about ensuring the stability and health of our system, that also  includes the application. A lot of times we encounter production systems  that concentrate on System Monitoring, under the assumption that a  stable system leads to stable and healthy applications. So let’s see  what System Monitoring can tell us about our Application. Let’s take a very simple two tier Web A
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Simple Twitter: Play Framework, AJAX, CRUD on Heroku - Java Code Geeks
http://blog.huchunhao.com/current-and-upcoming-cloud-platforms
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