[B! classloader] hiro360ã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

hiro360 id:hiro360

classloaderã«é–¢ã™ã‚‹hiro360ã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (9)

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ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã«ã¤ã„ã¦ - ã‹ã¨ã˜ã‚…ã‚“ã®æŠ€è¡“æ—¥èªŒ
Javaã§ã¯æ¬ ã‹ã›ãªã„ã‚¯ãƒ©ã‚¹ã‚’ãƒãƒ¼ãƒ‰ã™ã‚‹ãŸã‚ã®ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã€‚æ™®æ®µæ„è˜ã—ã¦ã„ãªã„ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“ãŒã€ã—ã£ã‹ã‚Šã¨ç¸ã®ä¸‹ã§æ”¯ãˆã¦ã„ã‚‹ã‚ˆãã€‚(Javaè¨€èªžä»•æ§˜ã‚’ç¢ºèªã—ãªãŒã‚‰æ›¸ã„ã¦ãªã„ã®ã§é–“é•ã£ã¦ã„ãŸã‚‰ãƒ„ãƒƒã‚³ãƒŸã‚ˆã‚ã—ãã§ã™) ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã¨ã¯ Javaã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ãƒ¼ï¼ˆè‹±: Java Classloaderï¼‰ã¨ã¯ã€Javaä»®æƒ³ãƒžã‚·ãƒ³ã®ä¸€éƒ¨ã§ã€Javaã‚¯ãƒ©ã‚¹ã‚’Javaä»®æƒ³ãƒžã‚·ãƒ³ã«å‹•çš„ã«ãƒãƒ¼ãƒ‰ã™ã‚‹å½¹å‰²ã‚’æŒã¤ [1]ã€‚é€šå¸¸ã€ã‚¯ãƒ©ã‚¹ã¯å¿…è¦ã«ãªã£ãŸã¨ãåˆã‚ã¦ãƒãƒ¼ãƒ‰ã•ã‚Œã‚‹ã€‚Javaã®å®Ÿè¡Œç³»ã¯ã€ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ãƒ¼ãŒã‚ã‚‹ãŠã‹ã’ã§ãƒ•ã‚¡ã‚¤ãƒ«ã‚„ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã«ã¤ã„ã¦çŸ¥ã‚‹å¿…è¦ãŒãªã„ã€‚ å¤§ããåˆ†ã‘ã¦ä»¥ä¸‹ã®3ã¤ã®ç¨®é¡žãŒã‚ã‚Šã¾ã™ã€‚ ãƒ–ãƒ¼ãƒˆã‚¹ãƒˆãƒ©ãƒƒãƒ— ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ ã‚¨ã‚¯ã‚¹ãƒ†ãƒ³ã‚·ãƒ§ãƒ³ ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ ã‚·ã‚¹ãƒ†ãƒ ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ ãƒ–ãƒ¼ãƒˆã‚¹ãƒˆãƒ©ãƒƒãƒ—ã¯ã€Javaã®ã‚³ã‚¢ãƒ©ã‚¤ãƒ–ãƒ©ãƒª($JAVA_HOME/lib/rt.jar)ã®ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã€ãƒ‘ãƒƒã‚±ãƒ¼ã‚¸ãŒj
hiro360 2010/07/06
java

classloader
ãƒªãƒ³ã‚¯
HOT reloadingã¨ClassLoaderã‚’ç†è§£ã—ã‚ˆã† - ã²ãŒã‚„ã™ã‚’æŠ€è¡“ãƒ–ãƒã‚°
Javaã§ã¯Classã¯ClassLoaderã«èªã¿è¾¼ã¾ã‚Œã¾ã™ã€‚ã“ã‚Œã¯ã»ã¨ã‚“ã©ã®äººãŒçŸ¥ã£ã¦ã„ã‚‹ã¨æ€ã„ã¾ã™ã€‚AOPã‚’ä½¿ã†ã¨ãã®ã‚¨ãƒ³ãƒãƒ³ã‚¹ã•ã‚ŒãŸã‚¯ãƒ©ã‚¹ã‚‚åŒæ§˜ã«ClassLoaderã«èªã¿è¾¼ã¾ã‚Œã¾ã™ã€‚ ã“ã‚Œã‚‰ã®æƒ…å ±ã¯ã€ãƒ‘ãƒ¼ãƒžãƒãƒ³ãƒˆé ˜åŸŸã«æ ¼ç´ã•ã‚Œã¾ã™ãŒã€ClassLoaderãŒGCã•ã‚Œã‚‹ã¨è§£æ”¾ã•ã‚Œã¾ã™ã€‚ Seasar2ã®HOT reloadingã§ã¯ã€ãƒªã‚¯ã‚¨ã‚¹ãƒˆã®åº¦ã«ClassLoaderã‚’ä½œã£ã¦ã€ãã“ã«Classã‚’ãƒãƒ¼ãƒ‰ã—ã€ãã®ClassLoaderã¯ã€ãƒªã‚¯ã‚¨ã‚¹ãƒˆãŒçµ‚ã‚ã£ãŸã‚‰ç ´æ£„ã—ã¦ã„ã‚‹ã®ã§ã€Classã®æƒ…å ±ã¯ã€ãƒªã‚¯ã‚¨ã‚¹ãƒˆã”ã¨ã«ç ´æ£„ã•ã‚Œã¦ã„ã¾ã™ã€‚ HOT relodingã«ã‚ˆã£ã¦ã€ãƒ‘ãƒ¼ãƒžãƒãƒ³ãƒˆé ˜åŸŸãŒä½¿ã„ã¤ãã•ã‚Œã‚‹ã“ã¨ã¯ã‚ã‚Šã¾ã›ã‚“ã€‚ ã•ã‚‰ã£ã¨æ›¸ãã¾ã—ãŸãŒã€ãã¡ã‚“ã¨ClassLoaderã‚’ç ´æ£„ã™ã‚‹ã®ã¯ã€ã‹ãªã‚Šå¤§å¤‰ã§ã™ã€‚ãƒªãƒ•ãƒ¬ã‚¯ã‚·ãƒ§ãƒ³ã®æƒ…å ±ãŒã‚ãƒ£ãƒƒã‚·ãƒ¥ã•ã‚Œã¦ã„ã‚‹ã¨ãã‚Œã ã‘ã§ç ´æ£„ã•ã‚Œãªããªã£ã¦ã—ã¾ã†ã‹ã‚‰
hiro360 2009/07/21
java

classloader

programming
ãƒªãƒ³ã‚¯
ã¯ã¦ãªãƒ–ãƒã‚° | ç„¡æ–™ãƒ–ãƒã‚°ã‚’ä½œæˆã—ã‚ˆã†
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hiro360 2009/01/17
java

seasar

classloader

programming
ãƒªãƒ³ã‚¯
2006-06-26
ä»Šæ—¥ã®æ—©è€³ãƒ ã‚¹ãƒ¡ã¯å—æ˜Žå¥ˆã¡ã‚ƒã‚“ï¼ŒãŠé¡Œã¯ã€Œçµ¶å¯¾ãŠã„ã—ã„ï¼ï¼ äººæ°—ã®å†·ãŸã„éººã€ï¼Ž ç‰¹ã«ã©ã†ã¨ã„ã†äº‹ã‚‚ãªãï¼Žï¼Žï¼Ž ãã†ã„ãˆã°æ˜”ï¼ŒçŸ³ç”°é¦™å¥ˆã¡ã‚ƒã‚“ã®æ™‚ã¯ã„ã¤ã‚‚ã“ã‚“ãªèª¿åã ã£ãŸãªãï¼Ž http://d.hatena.ne.jp/t-katochin/20060623/1151082516 ã®æœ€å¾Œã§æŒ‡æ‘˜ã•ã‚Œã¦ã‚‹ã‚ˆã†ã«ï¼ŒTomcat ä¸Šã§ S2AOP ã‚’ä½¿ã†ã¨ãƒªãƒãƒ¼ãƒ‰ã•ã‚Œã¦ã‚‚ S2Container ãŒ GC ã•ã‚Œãšï¼Œãƒ¡ãƒ¢ãƒªä¸è¶³ã§ä¾‹å¤–ãŒç™ºç”Ÿã™ã‚‹å ´åˆãŒã‚ã‚Šã¾ã™ï¼Ž ã“ã®ç¾è±¡ã¯ä»¥å‰ã‹ã‚‰èžã„ã¦ã¯ã„ã¾ã—ãŸãŒï¼Œãã£ã¡ã‚Šèª¿ã¹ã‚‹ã“ã¨ã¯ã—ã¦ã„ã¾ã›ã‚“ã§ã—ãŸï¼Ž ç†ç”±ã¯ é‹ç”¨ç’°å¢ƒã§ãƒªãƒãƒ¼ãƒ‰ãªã‚“ã¦ã‚ã‚Šå¾—ãªã„ï¼Ž é–‹ç™ºï¼ãƒ†ã‚¹ãƒˆç’°å¢ƒã§ã¯ Tomcat ã‚’å†èµ·å‹•ã™ã‚Œã°ã„ã„ ã¨ã„ã†ã“ã¨ã§ï¼Œè‡´å‘½å‚·ã«ãªã‚‹ã¨ã¯è€ƒãˆã¦ã„ãªã‹ã£ãŸãŸã‚ã§ã™ï¼Ž ãŒï¼Œã—ã‹ã—ï¼Ž æŸå·¨å¤§æŽ²ç¤ºæ¿ã§ã‚‚å›°ã£ã¦ã‚‹ã¨ã„ã†äººãŒã„ã‚‹ã®ã§èª¿ã¹ã¦ã¿ã¾ã—ãŸï¼Ž ã¾ãšï¼Œã‹ã¨ã¡ã‚“ã”æŒ‡æ‘˜ã®å¾ªç’°å‚ç…§ã«ã¤ã„
hiro360 2008/04/07
java

seasar

classloader
ãƒªãƒ³ã‚¯
ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ãƒ¡ãƒ¢ãã®ï¼“ - wyukawa's diary
Java ã§ã¯åŒã˜åå‰ã®ã‚¯ãƒ©ã‚¹ã§ã‚‚ï¼ŒåŒã˜ .class ãƒ•ã‚¡ã‚¤ãƒ«ã‹ã‚‰ ãƒãƒ¼ãƒ‰ã•ã‚ŒãŸã‚¯ãƒ©ã‚¹ã§ã‚‚ï¼Œç•°ãªã£ãŸã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ãƒ¼ã‹ã‚‰ ãƒãƒ¼ãƒ‰ã—ãŸã‚¯ãƒ©ã‚¹ã¯åˆ¥ã®ã‚¯ãƒ©ã‚¹ã¨ã—ã¦æ‰±ã‚ã‚Œã¾ã™ï¼Ž http://ml.seasar.org/archives/seasar-user/2007-January/007808.html ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã®ãƒ‡ã‚£ãƒ¼ãƒ—ãªä¸–ç•Œã¸ã‚ˆã†ã“ãï¼Ž ã¾ãšï¼ŒJava ã§ã¯ã‚¯ãƒ©ã‚¹ã¯ VM ä¸Šã«ä¸€ã¤ã§ã¯ãªãï¼Œ åŒã˜ã‚¯ãƒ©ã‚¹ã§ã‚‚ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã”ã¨ã«è¤‡æ•°å˜åœ¨ã™ã‚‹ å ´åˆãŒã‚ã‚Šã¾ã™ï¼Ž ãã—ã¦ç•°ãªã£ãŸã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã§ãƒãƒ¼ãƒ‰ã•ã‚ŒãŸã‚¯ãƒ©ã‚¹ã¯ï¼Œ ãŸã¨ãˆåŒã˜ .class ãƒ•ã‚¡ã‚¤ãƒ«ã‹ã‚‰ãƒãƒ¼ãƒ‰ã•ã‚ŒãŸã‚‚ã®ã§ ã‚ã£ã¦ã‚‚ç•°ãªã£ãŸã‚¯ãƒ©ã‚¹ã¨ã—ã¦æ‰±ã‚ã‚Œã¾ã™ï¼Ž ä¾‹ãˆã° Foo ã¨ã„ã†ã‚¯ãƒ©ã‚¹ãŒã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ A ã¨ B ã« ãƒãƒ¼ãƒ‰ã•ã‚ŒãŸå ´åˆï¼ŒFoo(A) ã¨ Foo(B) ã¯ç•°ãªã£ãŸ ã‚¯ãƒ©ã‚¹ã§ã‚ã‚Šï¼Œãã®ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã‚‚åˆ¥ç‰©ã§ã™ï¼Ž Foo(A) åž‹
hiro360 2008/03/30
java

classloader
ãƒªãƒ³ã‚¯
ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ãƒ¡ãƒ¢ãã®ï¼’ - wyukawa's diary
ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã‚’è‡ªä½œã™ã‚‹å ´åˆ 1. DirectoryClassLoader ã®ä½œæˆ import java.io.BufferedInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; public class DirectoryClassLoader extends ClassLoader { private static final int BUFFER_SIZE = 1024; private final String targetDirectory; DirectoryClassLoader(String targetDi
hiro360 2008/03/30
java

classloader
ãƒªãƒ³ã‚¯
ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ãƒ¡ãƒ¢ãã®ï¼‘ - wyukawa's diary
ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã¨ã¯ã‚¯ãƒ©ã‚¹ã‚’ãƒ¡ãƒ¢ãƒªä¸Šã«ãƒãƒ¼ãƒ‰ã™ã‚‹ã‚‚ã®ã€‚ J2SEã§ã¯ä»¥ä¸‹ã®ï¼“ã¤ãŒã‚ã‚‹ã€‚è‡ªä½œã™ã‚‹ã“ã¨ã‚‚å¯èƒ½ã€‚ ãƒ–ãƒ¼ãƒˆã‚¹ãƒˆãƒ©ãƒƒãƒ—ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€:rt.jarã®ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ æ‹¡å¼µã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€:lib/extã®ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ ã‚·ã‚¹ãƒ†ãƒ ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€:classpathã®ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã«ã¯è¦ªåé–¢ä¿‚ãŒã‚ã‚Šã€åã¯è¦ªã‚’çŸ¥ã£ã¦ã„ã‚‹ãŒã€è¦ªã¯åã‚’çŸ¥ã‚‰ãªã„ã€‚å…„å¼Ÿã‚‚çŸ¥ã‚‰ãªã„ã€‚ åã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã«ã€ã‚¯ãƒ©ã‚¹ã®ãƒãƒ¼ãƒ‰ã®ä¾é ¼ãŒã‚ã‚‹ã¨ã€è¦ªã«å§”è²ã—ã€æœ€åˆã«ç™ºè¦‹ã•ã‚ŒãŸã‚¯ãƒ©ã‚¹ãŒãƒãƒ¼ãƒ‰ã•ã‚Œã‚‹ï¼ˆparent firstï¼‰ã€‚ å…·ä½“çš„ã«java.lang.ClassLoaderã®loadClassãƒ¡ã‚½ãƒƒãƒ‰ã‚’è¦‹ã‚‹ã¨ã€ findLoadedClassã§ã™ã§ã«ãƒãƒ¼ãƒ‰ã•ã‚Œã¦ã„ãªã„ã‹èª¿ã¹ã¦ã€ã‚‚ã—ãƒãƒ¼ãƒ‰ã•ã‚Œã¦ã„ãªã„ãªã‚‰ã€è¦ªã«å§”è²ï¼ˆãƒ–ãƒ¼ãƒˆã‚¹ãƒˆãƒ©ãƒƒãƒ—ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã¾ã§ï¼‰ã€‚ è¦‹ã¤ã‹ã‚‰ãªã‹ã£ãŸã‚‰ã€findClassã§æŽ¢ã™ã€‚ã¨ãªã£ã¦ã„ã‚‹ã€‚ protected s
hiro360 2008/03/30
java

classloader
ãƒªãƒ³ã‚¯
Java ã®ã‚¯ãƒ©ã‚¹ã‚¢ãƒ³ãƒãƒ¼ãƒ‰ (Class Unloading)
ä½œæˆæ—¥ï¼š2004.05.18 æ›´æ–°æ—¥ï¼š2005.06.21 ä»Šå¾Œã€éšæ™‚æ›¸ãè¶³ã—ã¦è¡Œãã¾ã™ã€‚å¤šåˆ†ã€‚ ã¯ã˜ã‚ã« Java ã¯å‹•çš„ã«ã‚¯ãƒ©ã‚¹ã®ãƒãƒ¼ãƒ‰ã¨ã‚¢ãƒ³ãƒãƒ¼ãƒ‰ãŒè¡Œã‚ã‚Œã‚‹ä»•çµ„ã¿ã«ãªã£ã¦ã„ã‚‹ã€‚ ã‚¯ãƒ©ã‚¹ã¯ã‚¯ãƒ©ã‚¹ãƒ•ã‚¡ã‚¤ãƒ«ã®å½¢ã§ãƒ‡ã‚£ã‚¹ã‚¯ä¸Šã‚„ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã«é…ç½®ã•ã‚Œã€ãƒ—ãƒã‚°ãƒ©ãƒ ä¸ã§ãã‚Œã‚‰ãŒæœ¬å½“ã«å¿…è¦ã«ãªã£ãŸæ®µéšŽã§ JavaVM ä¸Šã«èªã¿è¾¼ã¾ã‚Œã‚‹ã€‚ ã¾ãŸã‚¯ãƒ©ã‚¹ã¯ãã®ä½¿ç”¨ãŒçµ‚ã‚ã£ãŸæ®µéšŽã§ã‚¬ãƒ¼ãƒ™ãƒ¼ã‚¸ã‚³ãƒ¬ã‚¯ã‚¿ãƒ¼ã«ã‚ˆã£ã¦å‹•çš„ã«å›žåŽã•ã‚Œ JavaVM ã‹ã‚‰ã‚¢ãƒ³ãƒãƒ¼ãƒ‰ã•ã‚Œã‚‹ã€‚ Servlet / J2EE ã‚µãƒ¼ãƒãƒ¼ãªã©ã¯ã“ã®æ€§è³ªã‚’åˆ©ç”¨ã—ã¦é‹ç”¨ä¸ã«ãƒ—ãƒã‚°ãƒ©ãƒ ã®ä¸€éƒ¨ã‚’å…¥ã‚Œæ›¿ãˆã‚‹ãƒ›ãƒƒãƒˆã‚¹ãƒ¯ãƒƒãƒ— (Hot Swap) ã‚’å®Ÿç¾ã—ã¦ã„ã‚‹ã€‚ ã ãŒã“ã®ä»•çµ„ã¿ã‚’å®Ÿè£…ã™ã‚‹ã«ã¯å°‘ã—å·¥å¤«ãŒã„ã‚‹ã€‚ ã“ã®æ–‡æ›¸ã§ã¯ã‚¯ãƒ©ã‚¹ã®ã‚¢ãƒ³ãƒãƒ¼ãƒ‰ã‚’å®Ÿç¾ã™ã‚‹ã‚„ã‚Šæ–¹ã«ã¤ã„ã¦è¿°ã¹ã‚‹ã€‚ 1. ã‚¯ãƒ©ã‚¹ã®ãƒãƒ¼ãƒ‰ã¨ã‚¢ãƒ³ãƒãƒ¼ãƒ‰ã®åŸºæœ¬çš„ãªä»•çµ„ã¿ ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ãƒ¼ Java VM ãŒã‚¯ãƒ©
hiro360 2006/12/27
java

tips

classloader
ãƒªãƒ³ã‚¯
1