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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
ãƒªãƒ³ã‚¯
Just make it scale: An Aurora DSQL story
Just make it scale: An Aurora DSQL storyMay 27, 2025 â€¢ 3404 words At re:Invent we announced Aurora DSQL, and since then Iâ€™ve had many conversations with builders about what this means for database engineering. Whatâ€™s particularly interesting isnâ€™t just the techno logy itself, but the journey that got us here. Iâ€™ve been wanting to dive deeper into this story, to share not just the what, but the how
uokada 2025/10/12
rust

kotlin

jvm
ãƒªãƒ³ã‚¯
ã‚ãªãŸã¯JVMã®æ°—æŒã¡ã‚’ç†è§£ã§ãã‚‹ã‹ï¼Ÿ
2025å¹´1æœˆ JJUG ãƒŠã‚¤ãƒˆã‚»ãƒŸãƒŠãƒ¼è³‡æ–™
uokada 2025/01/28
jvm
ãƒªãƒ³ã‚¯
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‚¯
Shenandoah in OpenJDK 17: Sub-millisecond GC pauses | Red Hat Developer
uokada 2024/08/07
jvm

JVM
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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‚¯
Scalaã¯ã‚‚ã†ã ã‚ãªã®ã‹ï¼Ÿâ€¦ã¨ã„ã†ã‹JVMè¨€èªžãŒã‚‚ã†ã ã‚ã˜ã‚ƒã‚“ï¼Ÿï½œsugitani
Androidã®ãŸã‚ã®Java/Kotlinã¯ã‚¹ã‚³ãƒ¼ãƒ—å¤–ã¨ã—ã¾ã™ ã¾ãšæ–ã£ã¦ãŠãã¨ã€ä¿ºã¯ScalaãŒå¥½ãã ã€‚ è‡ªåˆ†ãŒä½œã£ãŸScalaãƒ—ãƒãƒ€ã‚¯ãƒˆã¯äºŒå€‹ç¾å˜ã—ã¦ã„ã‚‹ã€‚ã†ã¡ä¸€ã¤ã¯ã¾ã ã¾ã è‡ªåˆ†ãŒé–‹ç™ºã—ã¦ã„ã‚‹ã€‚ã¨ã„ã†ã‹ä»Šã¯ä¼šç¤¾ã‚’ä½œã£ã¦1äººã§ãƒ—ãƒãƒ€ã‚¯ãƒˆã‚’ä½œã£ã¦ã„ã‚‹èº«ãªã®ã ãŒã€ãã‚Œã‚‚Scala3+ZIO2ã§ã‚´ãƒªã‚´ãƒªæ›¸ã„ã¦ã„ã‚‹ã€‚ ã§ã‚‚æ®‹å¿µã€ã‚‚ã†Scalaã¨ã„ã†ã‹JVMè¨€èªžãŒã‚ªã‚¹ã‚¹ãƒ¡ã§ãã¾ã›ã‚“ã€‚TypeScriptã‹Goã‹Rustã‚’ã‚ªã‚¹ã‚¹ãƒ¡ã—ã¾ã™ã€‚ ã©ã†ã„ã†ã“ã¨ï¼Ÿã¾ãšã“ã®è¨˜äº‹ã‚’è¦‹ã¦ã„ãŸã ãã®ãŒä¸€ç•ªåˆ†ã‹ã‚Šã‚„ã™ã„ã€‚ https://aws.amazon.com/jp/builders-flash/202310/java-serverless-saas-backend/?awsf.filter-name=*all ç´ æ™´ã‚‰ã—ã„ã‚¨ãƒ³ãƒˆãƒªãƒ¼ã ã€‚èªã¿ã«è¡Œã‹ãªã„ã›ã£ã‹ã¡ãªæ–¹ã®ãŸã‚ã«æ¦‚è¦ã‚’ç´¹ä»‹ã™ã‚‹ Javaãƒ—ãƒãƒ€ã‚¯ãƒˆã‚’AWS
uokada 2023/12/25
jvm

scala

serverless
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
ãƒªãƒ³ã‚¯
Choosing a GC Algorithm in Java | Baeldung
uokada 2023/10/30
GC

java

JDK

jvm
ãƒªãƒ³ã‚¯
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
ãƒªãƒ³ã‚¯
çŸ¥ã£ã¦ä½¿ãˆã‚‹JVMã®æ¦‚è¦ã¨ãƒ’ãƒ¼ãƒ—ãƒ€ãƒ³ãƒ—å–å¾—ã‹ã‚‰è§£æžã¾ã§
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uokada 2023/10/23
jvm

performance

development
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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
ãƒªãƒ³ã‚¯
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
ãƒªãƒ³ã‚¯
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
ãƒªãƒ³ã‚¯
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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builders.flash - å¤‰åŒ–ã‚’æ±‚ã‚ã‚‹ãƒ‡ãƒ™ãƒãƒƒãƒ‘ãƒ¼ã‚’å¿œæ´ã™ã‚‹ AWS ã®ã‚¦ã‚§ãƒ–ãƒžã‚¬ã‚¸ãƒ³
builders.flash ã¯ã€å¤‰åŒ–ã‚’æ±‚ã‚ã‚‹é–‹ç™ºè€…ã®çš†æ§˜ã¸å‘ã‘ã¦ã€æ¥½ã—ã¿ãªãŒã‚‰å®Ÿè·µçš„ã«å¦ã¹ã‚‹ãƒˆãƒ”ãƒƒã‚¯ã‚’æ—¥æœ¬èªžã§ãŠå±Šã‘ã™ã‚‹ AWS ã®ã‚¦ã‚§ãƒ–ãƒžã‚¬ã‚¸ãƒ³ã§ã™ã€‚ãŠå®¢æ§˜ã®é–‹ç™ºã®ã‚¹ãƒ”ãƒ¼ãƒ‰ã‚’åŠ é€Ÿã—ã€ã‚¤ãƒŽãƒ™ãƒ¼ã‚·ãƒ§ãƒ³ã‚’ã‚µãƒãƒ¼ãƒˆã™ã‚‹ãƒãƒ³ã‚ºã‚ªãƒ³ã‚„æŠ€è¡“è§£èª¬ã‚’é€šã˜ã¦ã€æ¯ŽæœˆãŠå¥½ããªæ™‚é–“ã«å¦ã¶ã“ã¨ãŒã§ãã¾ã™ã€‚ ãƒ¡ãƒ¼ãƒ«ãƒ¡ãƒ³ãƒãƒ¼ã«ç™»éŒ²Â ã™ã‚‹ã“ã¨ã§ãƒãƒ³ã‚ºã‚ªãƒ³ã«å½¹ç«‹ã¤ã‚¯ãƒ¬ã‚¸ãƒƒãƒˆã‚³ãƒ¼ãƒ‰ã‚„æœ€æ–°ã‚¢ãƒƒãƒ—ãƒ‡ãƒ¼ãƒˆã‚’å—ã‘å–ã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚
uokada 2021/10/07
aws

lambda

jvm
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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
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java

google

security

jvm
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