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Java ä»®æƒ³ãƒžã‚·ãƒ³ã‚’è‡ªä½œã—ãŸã„å…¨ã¦ã®æ–¹ã€…ã¸
ã¯ã˜ã‚ã« ç¥ï¼ Java 25 ãƒªãƒªãƒ¼ã‚¹ å…ˆæ—¥ï¼ˆ2025å¹´9æœˆ16æ—¥ï¼‰ï¼ŒJava 25 ãŒãƒªãƒªãƒ¼ã‚¹ã•ã‚ŒãŸã“ã¨ã¯ï¼ŒJava ã‚’æ„›ã™ã‚‹çš†ã€…æ§˜ãªã‚‰ã”å˜çŸ¥ã®ã“ã¨ã‹ã¨æ€ã„ã¾ã™ã€‚ ç‰¹ã«ï¼Œã“ã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¯ Java 21 ã«ç¶šã 2 å¹´ã¶ã‚Šã®é•·æœŸã‚µãƒãƒ¼ãƒˆï¼ˆLTS;Long-Term Supportï¼‰ç‰ˆã§ã‚ã‚Šï¼Œä¼æ¥åˆ©ç”¨ã«ãŠã„ã¦ã‚‚å®‰å¿ƒã—ã¦ä½¿ãˆã‚‹ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¨ã—ã¦ä»Šå¾Œã®æ™®åŠãŒè¦‹è¾¼ã¾ã‚Œã¦ã„ã¾ã™ã€‚ å‰ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¨ã®æ¯”è¼ƒã‚„æ³¨ç›®ã®ç‚¹ã«é–¢ã—ã¦ã¯ï¼ŒQiita ã®æ–¹ã«è‰¯ã„è¨˜äº‹ãŒã‚ã‚Šã¾ã—ãŸã®ã§ï¼Œãã¡ã‚‰ã‚’ã”å‚ç…§ãã ã•ã„ã€‚ Java ã®è¨€èªžä»•æ§˜ã¨ JVM ã®ä»•çµ„ã¿ã¯å…¬é–‹ã•ã‚Œã¦ã„ã‚‹ ã¨ã“ã‚ã§ï¼ŒJava ã®ã‚ã‚‰ã‚†ã‚‹è¨€èªžä»•æ§˜ã‚„ Java ä»®æƒ³ãƒžã‚·ãƒ³ï¼ˆJVMï¼‰ ã®ä»•çµ„ã¿ã¯ï¼ŒJEPï¼ˆJDK Enhancement Proposalï¼‰ã‚„ JSRï¼ˆJava Specification Requestï¼‰ãªã©ã®ææ¡ˆã‚’é€šã˜ã¦è°è«–ã•ã‚Œï¼Œæœ€çµ‚çš„ã« Ope
uokada 2025/11/15
java

jvm
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Main - Shenandoah - OpenJDK Wiki
Shenandoah GCShenandoah is the low pause time garbage collector that reduces GCÂ pause times by performing more garbage collection work concurrently with the running Java program. Shenandoah does the bulk of GC work concurrently, including the concurrent compaction, which means its pause times are no longer directly proportional to the size of the heap. Garbage collecting a 200 GB heap or a 2 GB he
uokada 2024/08/07
GC

java

JVM
ãƒªãƒ³ã‚¯
SLF4Jã¨Logbackã¯2023å¹´æœ«ç¾åœ¨ã§ç©æ¥µæŽ¡ç”¨ã—ã¦ã„ã„ã‚ˆ - Kengo's blog
2å¹´å‰ã®ãƒ–ãƒã‚°ãŒæœªã ã«ãƒ–ã‚¯ãƒžã•ã‚Œã‚‹ã®ã§ã€å¿µã®ãŸã‚æŽ²é¡Œã®ä»¶ã«ã¤ã„ã¦æ›¸ã„ã¦ãŠãã¾ã™ã€‚ ç«¯çš„ã«æ›¸ãã¨ã€ã‚ã®ãƒ–ãƒã‚°ã§æŒ™ã’ãŸæ‡¸å¿µäº‹é …ãŒè§£æ¶ˆã•ã‚ŒãŸã®ã§ã©ã‚“ã©ã‚“ä½¿ã†ã¨è‰¯ã„ã¨æ€ã„ã¾ã™ã€‚ SLF4J v2ã®å®‰å®šç‰ˆãŒãƒªãƒªãƒ¼ã‚¹ã•ã‚ŒãŸ è‰¯ã‹ã£ãŸã§ã™ãã€‚ã¡ãªã¿ã«v2.0.9ã‹ã‚‰ slf4j.provider ãƒ—ãƒãƒ‘ãƒ†ã‚£ã§providerã‚’æŒ‡å®šã§ãã‚‹ã‚ˆã†ã«ãªã£ãŸã®ã§ã€Service Loaderã«ã‚ˆã‚‹provideræŽ¢ç´¢ã‚’ã‚¬ãƒ„ãƒƒã¨ã‚¹ã‚ãƒƒãƒ—ã§ãã¾ã™ã€‚å¤šãã®ãƒ¦ãƒ¼ã‚¹ã‚±ãƒ¼ã‚¹ã§ã¯åˆ©ç”¨ã—ãŸã»ã†ãŒãƒã‚°ã®å˜ç´”åŒ–ã‚„èµ·å‹•ã®é«˜é€ŸåŒ–ã«æœ‰åŠ¹ã®ã¯ãšã§ã™ã€‚ SLF4Jã®æ´»å‹•ã¯æœ€è¿‘æ´»ç™º JIRAã®ãƒ‡ãƒ¼ã‚¿ã‚’è¦‹ã‚Œã°ä¸€ç›®çžç„¶ã€‚ç§ã‚‚GitHub Issueã§å›žç”ã«å›žã£ãŸã‚Šã—ã¾ã™ãŒã€è‘—è€…ã®æ–¹ã‚‚é »ç¹ã«ã‚³ãƒ¡ãƒ³ãƒˆã—ã¦ãã‚Œã¦ã¾ã™ã€‚æœ€è¿‘ã®Logbackã®è„†å¼±æ€§ã¸ã®å¯¾å¿œã‚‚å……åˆ†ã«æ—©ã‹ã£ãŸã®ã§ã¯ãªã„ã§ã—ã‚‡ã†ã‹ã€‚ å›³1 2023å¹´ã®æ´»å‹•çŠ¶æ³ã€‚ç·‘ã®ç·šãŒ6ãƒ¶æœˆè¿‘ãå³è‚©ä¸ŠãŒã‚Šãªã®ã«
uokada 2024/02/19
java

SLF4J

jvm
ãƒªãƒ³ã‚¯
GC progress from JDK 8 to JDK 17
JDK 17 has been out for a few months and itâ€™s not just packed with new language features. The performance boost compared to older JDK versions is also really significant. It becomes especially clear when compared to the previous LTS releases, JDK 8 and JDK 11. Much of the improved performance comes from new features and optimizations in the JVM and in this post the focus will be on the improvement
uokada 2023/10/30
GC

java

JDK

jvm
ãƒªãƒ³ã‚¯
Default garbage collector for Java 8
uokada 2023/10/30
GC

java

JDK

jvm
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Choosing a GC Algorithm in Java | Baeldung
uokada 2023/10/30
GC

java

JDK

jvm
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HotSpot Virtual Machine Garbage Collection Tuning Guide
uokada 2023/10/30
GC

java

JDK

jvm
ãƒªãƒ³ã‚¯
G1GC Feedback - G1GC Feedback - OpenJDK Wiki
IntroductionAs described in JEP 248, in JDK 9Â the default garbage collector will switch from Parallel Garbage Collector (Parallel GC) to G1 Garbage Collector (G1GC). This wiki-page aims to outline the basic JVM parameters switching to G1GC, and how you can help collecting data comparing the G1GC and Parallel GC. Usually we would like to ask for gc logs, printed Â withÂ '-XX:+PrintGCTimeStamps -XX:+P
uokada 2023/10/30
GC

java

JDK

jvm
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Scalaã®ãƒ¡ãƒ¢ãƒªä½¿ç”¨é‡ã¯Javaã‚ˆã‚Šã‚‚å¤šã„ã‹æ¤œè¨¼ã—ãŸ - Lambdaã‚«ã‚¯ãƒ†ãƒ«
ã“ã†ã„ã†è¨˜äº‹ã‚’èªã‚“ã ã€‚ transparent-to-radiation.blogspot.com ãªã‚“ã‹Scalaã®ãƒ¡ãƒ¢ãƒªä½¿ç”¨é‡ãŒç•°å¸¸ã«å¤šã„ãªã¨æ€ã£ã¦ã€èª¿ã¹ãŸã€‚æ¤œè¨¼ã‚³ãƒ¼ãƒ‰ã‚‚ã‚¢ãƒƒãƒ—ã—ãŸã€‚ github.com æ¤œè¨¼ã¨ã—ã¦ã€æ§˜ã€…ãªJVM(OpenJDKã¨ã‹Corettoã¨ã‹)ã¨ãã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³(8, 11, 17)ã§JARã‚’å®Ÿè¡Œã—ã¦è€ƒå¯Ÿã—ãŸã€‚JVMã‚’ç”¨æ„ã™ã‚‹ãŸã‚ã«ASDFã‚’ä½¿ã£ãŸã€‚ã¾ãŸã€ASDFã‹ã‚‰å¼•ã£ã±ã£ã¦ã“ã‚Œãªã„JVMã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³(OpenJDKã®8ãªã©)ã¯çœç•¥ã—ã¦ã„ã‚‹ã€‚ JAVA_OPTSã¯-Xms100M -Xmx2Gã§ã‚ã‚‹ã€‚ æ‰‹å…ƒã®ãƒžã‚·ãƒ³(Linux x86_64 Xeon W-10855M 2.80GHz 64GiB RAM)ã§ã®run-matrix.shã®å®Ÿè¡Œçµæžœã¯ã€ä»¥ä¸‹ã®é€šã‚Š(å„åˆ—ã¯ã€JVMã€è¨ˆç®—ä»¶æ•°ã€å®Ÿè¡Œæ™‚é–“Secã€ãƒ¡ãƒ¢ãƒªç·ä½¿ç”¨é‡KiB)ã€‚ openjdk-11 openjd
uokada 2023/05/31
scala

java

GraalVM

jvm
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ZOZOFIT èªè¨¼ãƒ•ãƒãƒ¼ã«ãŠã‘ã‚‹JVMè¨€èªžå®Ÿè£…ã®Lambdaé–¢æ•°ã®ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹æ”¹å–„ - ZOZO TECH BLOG
ã¯ã˜ã‚ã« ã“ã‚“ã«ã¡ã¯ã€‚è¨ˆæ¸¬ãƒ—ãƒ©ãƒƒãƒˆãƒ•ã‚©ãƒ¼ãƒ é–‹ç™ºæœ¬éƒ¨ãƒãƒƒã‚¯ã‚¨ãƒ³ãƒ‰ãƒãƒ¼ãƒ ã®å²¡å±±ã§ã™ã€‚æ™®æ®µã¯ZOZOMATã‚„ZOZOGLASSãªã©ã®è¨ˆæ¸¬æŠ€è¡“ã«é–¢ã‚ã‚‹ã‚·ã‚¹ãƒ†ãƒ ã®é–‹ç™ºã€é‹ç”¨ã«æºã‚ã£ã¦ã„ã¾ã™ã€‚åŽ»å¹´ã®å¤ã«ZOZOFITã¨ã„ã†ã‚µãƒ¼ãƒ“ã‚¹ã‚’åŒ—ç±³å‘ã‘ã«ãƒãƒ¼ãƒ³ãƒã—ã€ãã®ã‚·ã‚¹ãƒ†ãƒ ã‚‚åŒæ§˜ã«é–‹ç™ºã€é‹ç”¨ã«æºã‚ã£ã¦ã„ã¾ã™ã€‚ æœ¬è¨˜äº‹ã§ã¯ã€ZOZOFITã®èªè¨¼ãƒ•ãƒãƒ¼ã§å®Ÿè¡Œã•ã‚Œã‚‹Scalaå®Ÿè£…ã®AWS Lambdaé–¢æ•°ãŒæŠ±ãˆã¦ã„ãŸãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹èª²é¡Œã¨ã€ãã®èª²é¡Œã®è§£æ±ºã«è‡³ã‚‹ã¾ã§ã®å–ã‚Šçµ„ã¿ã«ã¤ã„ã¦ã”ç´¹ä»‹ã—ã¾ã™ã€‚ ç›®æ¬¡ ã¯ã˜ã‚ã« ç›®æ¬¡ ZOZOFITã¨ã¯ ZOZOFITãŒåˆ©ç”¨ã™ã‚‹èªè¨¼ã‚µãƒ¼ãƒ“ã‚¹ ã‚«ã‚¹ã‚¿ãƒ èªè¨¼ãƒ•ãƒãƒ¼ã¨ã¯ ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ã«é–¢ã™ã‚‹èª²é¡Œ ã‚«ã‚¹ã‚¿ãƒ èªè¨¼ãƒ•ãƒãƒ¼ã«ãŠã‘ã‚‹ãƒœãƒˆãƒ«ãƒãƒƒã‚¯ã®ç‰¹å®š Lambdaé–¢æ•°ã®ãƒœãƒˆãƒ«ãƒãƒƒã‚¯èª¿æŸ» Lambdaé–¢æ•°ã®ãƒ¡ãƒ¢ãƒªè¨å®šæœ€é©åŒ– ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹æ”¹å–„çµæžœ çµ‚ã‚ã‚Šã« ZOZOFITã¨ã¯ ZOZOFITã¯202
uokada 2023/04/11
lambda

jvm

java
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Memory Analyzer (MAT) | The Eclipse Foundation
Memory Analyzer (MAT) The Eclipse Memory Analyzer is a fast and feature-rich Java heap analyzer that helps you find memory leaks and reduce memory consumption. Use the Memory Analyzer to analyze productive heap dumps with hundreds of millions of objects, quickly calculate the retained sizes of objects, see who is preventing the Garbage Collector from collecting objects, run a report to automatical
uokada 2023/04/06
java

jvm

analyze
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ã¼ããŸã¡ã¯ Java ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã®èµ·å‹•é€Ÿåº¦ã‚’ã©ã“ã¾ã§ç¸®ã‚ã‚‰ã‚Œã‚‹ã‹
AWS Dev Day 2022 ã§ç™ºè¡¨ã—ãŸJava ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã®èµ·å‹•é€Ÿåº¦ã®ã‚¢ãƒ—ãƒãƒ¼ãƒã®è³‡æ–™
uokada 2022/11/11
java

serverless

jvm

aws
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Java Mission Control
JDK Mission Control Java Flight Recorder and JDK Mission Control together create a complete tool chain to continuously collect low level and detailed runtime information enabling after-the-fact incident analysis. Java Flight Recorder is a profiling and event collection framework built into the Oracle JDK. It allows Java administrators and developers to gather detailed low level information about h
uokada 2021/07/22
java

monitoring

jvm
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How I Hacked Google App Engine: Anatomy of a Java Bytecode Exploit
uokada 2021/05/10
ã‚ã¨ã§èªã‚€

java

google

security

jvm
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https://blogs.oracle.com/jtc/comparing-jvms-on-armlinux
uokada 2021/02/09
arm

jvm

java

compiler
ãƒªãƒ³ã‚¯
Running Java Flight Recorder
uokada 2020/11/10
JDK

java

jvm

jfr
ãƒªãƒ³ã‚¯
JDK Flight Recorderã®ã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£æ¦‚è¦ - ãƒ–ãƒã‚°ãªã‚“ã ã‚ˆã‚‚ã‚“
ã¯ã˜ã‚ã« JFRã«ãŠã‘ã‚‹ã€Œã‚¤ãƒ™ãƒ³ãƒˆã€ ã‚¤ãƒ™ãƒ³ãƒˆã‚¿ã‚¤ãƒ—ã¨ã‚µãƒ³ãƒ—ãƒªãƒ³ã‚° ãƒ‡ãƒ¼ã‚¿ãƒ•ã‚©ãƒ¼ãƒžãƒƒãƒˆ å¾ªç’°ãƒãƒƒãƒ•ã‚¡ã¨ãƒ‡ãƒ¼ã‚¿ãƒ•ãƒãƒ¼ ãƒªãƒã‚¸ãƒˆãƒªã¨JFRãƒ•ã‚¡ã‚¤ãƒ«å JFRã®é–‹å§‹ã¨JFRãƒ•ã‚¡ã‚¤ãƒ«ãƒ€ãƒ³ãƒ— ã¾ã¨ã‚ å‚è€ƒ ã¯ã˜ã‚ã« JDK Flight Recorder(JFR)ã¯Javaã§åˆ©ç”¨ã§ãã‚‹å¸¸æ™‚æœ¬ç•ªé©ç”¨å¯èƒ½ãªè¶…ä½Žã‚ªãƒ¼ãƒãƒ¼ãƒ˜ãƒƒãƒ‰ã®ãƒ—ãƒãƒ•ã‚¡ã‚¤ãƒ©ã§ã™ã€‚æ€§èƒ½åˆ†æžã¨ã‹éšœå®³å¯¾å¿œã®å¼·ã„å‘³æ–¹ã§ã™ãï¼ ä»Šã¾ã§å•†ç”¨ãƒ©ã‚¤ã‚»ãƒ³ã‚¹ã®ã¿ä½¿ç”¨å¯èƒ½ã ã£ãŸã®ã§ã™ãŒã€JDK11ã‚ˆã‚ŠOpenJDKã«å–ã‚Šè¾¼ã¾ã‚Œè‡ªç”±ã«ä½¿ãˆã‚‹ã‚ˆã†ã«ãªã‚Šã¾ã—ãŸã€‚ã‚ªãƒ¼ãƒ—ãƒ³ã«ãªã£ãŸã®ã§è‰²ã€…è‡ªåˆ†ã§ã‚‚ä½¿ã„ãŸã„ã§ã™ã—ã€è‰²ã‚“ãªäººã«ã‚‚ä½¿ã£ã¦æ¬²ã—ã„ãªã¨æ€ã£ã¦ã„ã¾ã™ã€‚ ãŸã ã€Oracleã®å…¬å¼ãƒ‰ã‚ãƒ¥ãƒ¡ãƒ³ãƒˆãŒä½™ã‚Šã«ã‚‚ã‚µãƒ©ãƒªã¨ã—éŽãŽã¦ã„ã¦è‰¯ãã‚ã‹ã‚“ãªã„ã®ã§ã€ã„ãã¤ã‹ã®Oracleã‚„æœ‰å¿—ã®ç™ºè¡¨è³‡æ–™ã‚„è‡ªåˆ†ã®çŸ¥è˜ã‚’å…ƒã«ã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£æ¦‚è¦ã‚’è§£èª¬ã—ã¦è¦‹ã¾ã—ãŸã€‚ ã“ã®è¾ºã‚’ã—ã£ã‹ã‚Šåˆ†ã‹ã‚Šã‚„ã™ãæ›¸ã„ãŸå…¬
uokada 2020/11/10
JDK

java

jvm

jfr
ãƒªãƒ³ã‚¯
https://qconsf.com/system/files/presentation-slides/mikael_vidstedt_-_qconsf-continuous_monitoring_with_jdk_flight_recorder.pdf
uokada 2020/11/10
JDK

java

jvm

jfr
ãƒªãƒ³ã‚¯
ä½¿ã£ã¦ã¿ã‚ˆã†ï¼JDK Flight Recorder
The document discusses the JDK Flight Recorder, covering various features of both the Oracle JDK and OpenJDK versions, including recording configurations and managing recordings. It includes exercises related to JDK Mission Control, which is used to analyze flight recordings and improve application performance. Additionally, the document contains links to further resources and tutorials for users
uokada 2020/11/10
JDK

java

jvm

jfr
ãƒªãƒ³ã‚¯
JEP 328: Flight Recorder
Summary Provide a low-overhead data collection framework for troubleshooting Java applications and the HotSpot JVM. Goals Provide APIs for producing and consuming data as events Provide a buffer mechanism and a binary data format Allow the configuration and filtering of events Provide events for the OS, the HotSpot JVM, and the JDK libraries Non-Goals Provide visualization or analysis of collected
uokada 2020/11/10
jvm

JDK

java

jfr
ãƒªãƒ³ã‚¯
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