[B! java] tackeã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

tacke id:tacke

javaã«é–¢ã™ã‚‹tackeã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (69)

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Javaã§ã®nullãƒã‚§ãƒƒã‚¯ã®ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ - ãã—ã ã®Hatena
Javaã§ã®ãƒ—ãƒã‚°ãƒ©ãƒ ã§ã¯ã€OptionalãŒå…¥ã£ãŸã¨ã¯ã„ãˆã€nullã¨ã®ã¤ãã‚ã„ã¯ä¾ç„¶ã¨ã—ã¦é‡è¦ã§ã™ã€‚ ãã‚“ãªä¸ã§ã€nullãŒå…¥ã£ã¦ã‚‹ã¨å›°ã‚‹å‡¦ç†ã‚’æ›¸ãã¨ãã«ã¯ã€nullãƒã‚§ãƒƒã‚¯ã‚’è¡Œã†ã»ã†ãŒå®‰å…¨ã§ã™ã€‚ ãã®ã¨ãã€ã©ã®ã‚ˆã†ã«nullãƒã‚§ãƒƒã‚¯ã‚’è¡Œã†ã‹ã¨ã„ã†ã®ãŒå•é¡Œã«ãªã‚Šã¾ã™ã€‚ Java7ã‹ã‚‰ã¯ã€Objects.requiredNonNullã¨ã„ã†ãƒ¡ã‚½ãƒƒãƒ‰ãŒå°Žå…¥ã•ã‚ŒãŸã®ã§ã€ã“ã®ãƒ¡ã‚½ãƒƒãƒ‰ã‚’ä½¿ã£ã¦ã€ä»¥é™ã®å‡¦ç†ã§nullã˜ã‚ƒãªã„ã“ã¨ã‚’ä¿è¨¼ã™ã‚‹ã¨ã„ã†ã“ã¨ãŒã§ãã¾ã™ã€‚ ã‘ã©ã€ã“ã®requiredNonNullãŒé…ã„ã‚“ã˜ã‚ƒãªã„ã‹ã¨ã„ã†è©±ãŒã‚ã‚‹ã®ã§ã€ã©ã†é…ã„ã®ã‹èª¿ã¹ã¦ã¿ã¾ã—ãŸã€‚ requireNonNullã¨åŒæ§˜ã«ã€å€¤ãŒnullã ã£ãŸã‚‰NullPointerExceptionã‚’åã„ã¦ã€nullä»¥å¤–ã ã£ãŸã‚‰ç´ é€šã‚Šã™ã‚‹ã¨ã„ã†æ›¸ãæ–¹ã®ã²ã¨ã¤ã«ã€getClassãƒ¡ã‚½ãƒƒãƒ‰ã‚’å‘¼ã³å‡ºã™ã¨ã„ã†ã‚‚ã®ãŒã‚ã‚‹ã®ã§ã€ã“ã‚Œã¨æ¯”ã¹ã¦ã¿ã¾
tacke 2019/08/22
java
ãƒªãƒ³ã‚¯
Moments in Container History Infographic | Pivotal
VMware Tanzu is a cloud native application platform that enables vital DevSecOps outcomes in a multi-cloud world.
tacke 2019/03/15
spring

java

pivotal
ãƒªãƒ³ã‚¯
Java8ã®Date and Time APIã§ã¯yyyyã˜ã‚ƒãªãã¦uuuuã‚’ä½¿ã† - Mitsuyuki.Shiiba
2,3æ—¥å‰ã«ã“ã†ã„ã†ã®ã‚’æ›¸ã„ãŸã‚“ã ã‘ã© bufferings.hatena blog.com irofã•ã‚“ã¨å–‹ã£ã¦ãŸã‚‰ã€Œyyyyã˜ã‚ƒãªãã¦uuuuä½¿ã‚ãªãã‚ƒã¨ã‹ã‚‚ã‚ã‚Šã¾ã™ã‚ˆããƒ¼ã€ã£ã¦è¨€ã‚ã‚Œã¦ã€Œãˆï¼Ÿãã†ãªã‚“ã ã£ã‘ãƒ»ãƒ»ãƒ»ã‚ã‚Œãƒ¼ï¼Ÿå…¨ç„¶çŸ¥ã‚‰ãªã„ï¼ãƒ»ãƒ»ãƒ»ã‚ˆã†ãªã€é ã®éš…ã«ã‚ã‚‹ã‚ˆã†ãªãƒ»ãƒ»ãƒ»ã€ã£ã¦ãªã£ã¦ã€èª¿ã¹ã¨ã„ãŸã€‚ ã©ã†ã„ã†ã“ã¨ï¼Ÿ https://docs.oracle.com/javase/jp/8/docs/api/java/time/format/DateTimeFormatter.html yyyyã¯æš¦ã«å¯¾ã™ã‚‹å¹´(year-of-era)ã€uuuuã¯æš¦ã¨ã¯ç„¡é–¢ä¿‚ãªå¹´(year)ã€‚ãªã‚“ã ã£ã¦ã€‚ year-of-eraã£ã¦ä½•ï¼Ÿ day-of-monthãŒã€æœˆå§‹ã¾ã‚Šã‹ã‚‰ã®æ—¥ã«ã¡ã ã‹ã‚‰ã€æš¦å§‹ã¾ã‚Šã®å¹´ã£ã¦ã“ã¨ãªã‚“ã ã‚ã†ãªã€‚ãµã‚€ãƒ¼ã€‚ã‚¤ãƒžã‚¤ãƒã´ã‚“ã¨ã“ãªã„ã€‚ã‹ã‚‰ã€ã‚„ã£ã¦ã¿ã‚ˆã†ã€‚ æ™®é€šã«æ›¸ãã¨ã“ã†ã‹ã€‚ @Test
tacke 2018/10/23
java

java8
ãƒªãƒ³ã‚¯
ã‚ãªãŸã¨ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ— - ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—å…¥é–€ - ã“ã®å›½ã§ã¯çŠ¬ãŒ
åŽ»ã‚‹ 9 æœˆ 20 æ—¥ï¼ˆåœŸï¼‰ã«ã€ç¬¬å…«å›ž #æ¸‹è°·java ã¨ã„ã†ã‚¤ãƒ™ãƒ³ãƒˆã§ LT ã—ã¦ãã¾ã—ãŸã€‚ï¼ˆç¬¬å…«å›ž #æ¸‹è°·java ã§ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã«ã¤ã„ã¦ãŠè©±ã—ã—ã¾ã—ãŸ - ã“ã®å›½ã§ã¯çŠ¬ãŒï¼‰ ã‚ã¨ã‚ã¨è‡ªåˆ†ã§å‚ç…§ã—ãŸã‚Šã€ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã‚’çŸ¥ã‚‰ãªã„äººã«è¦‹ã›ãŸã‚Šã—ãŸã„å†…å®¹ã§ã‚‚ã‚ã‚‹ã®ã§ã€ãƒ–ãƒã‚°ã¨ã—ã¦ã¾ã¨ã‚ã¦ãŠãã¾ã™ã€‚ ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã¨ã¯ãªã«ã‹ ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã¯ã€ã²ã¨ã“ã¨ã§è¨€ã†ã¨ã€ŒJava ã®ã‚¹ãƒ¬ãƒƒãƒ‰ã®ã‚¹ãƒŠãƒƒãƒ—ã‚·ãƒ§ãƒƒãƒˆã€ã¨ã„ã†ã“ã¨ã«ãªã‚Šã¾ã™ã€‚ ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã‚’å–å¾—ã™ã‚‹ã“ã¨ã§ã€å–å¾—ã—ãŸçž¬é–“ã« JVM ä¸Šã§ã©ã®ã‚ˆã†ãªå‡¦ç†ãŒå®Ÿè¡Œã•ã‚Œã¦ã„ã‚‹ã®ã‹ã‚’ä¸€è¦§ã—ã¦ã€èª¿æŸ»ã™ã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚ å…·ä½“çš„ã«ã¯ã€ãã®çž¬é–“ã«å˜åœ¨ã—ã¦ã„ã‚‹å„ã‚¹ãƒ¬ãƒƒãƒ‰ã®åå‰ã€çŠ¶æ…‹ã€ã‚¹ã‚¿ãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ç‰ã‚’è¦‹ã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚ ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã¯ãªã‚“ã®å½¹ã«ç«‹ã¤ã®ã‹ ãƒ—ãƒã‚°ãƒ©ãƒ ãŒé…ã„ã¨ããƒ»ãƒ•ãƒªãƒ¼ã‚ºã—ãŸã¨ã ä¸€ã¤ã«ã¯ã€ãƒ—ãƒã‚°ãƒ©ãƒ ãŒé…ã„ã¨ããƒ»ãƒ•ãƒªãƒ¼ã‚ºã—ãŸã¨ãã®åŽŸå› èª¿æŸ»ã«å½¹ç«‹ã¡
tacke 2017/07/31
java

jvm
ãƒªãƒ³ã‚¯
Java7ã‹ã‚‰ã®jcmdã®ã‚¹ã‚¹ãƒ¡(ThreadDump/HeapDumpä»–) - Qiita
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tacke 2017/07/31
java

jcmd
ãƒªãƒ³ã‚¯
ã€Œã†ã‚ã£â€¦ç§ã®ã‚¢ãƒ—ãƒªã€é…ã™ãŽâ€¦ï¼Ÿã€ ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã§Javaã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã®ãƒœãƒˆãƒ«ãƒãƒƒã‚¯ã‚’èª¿æŸ»ã—ã‚ˆã† | TECHSCORE BLOG | TECHSCORE BLOG
ã€Œã†ã‚ã£â€¦ç§ã®ã‚¢ãƒ—ãƒªã€é…ã™ãŽâ€¦ï¼Ÿã€ ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã§Javaã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã®ãƒœãƒˆãƒ«ãƒãƒƒã‚¯ã‚’èª¿æŸ»ã—ã‚ˆã† ã“ã‚“ã«ã¡ã¯ã€å¯ºå²¡ã§ã™ã€‚ ä»Šå›žã¯ã€ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã®ãƒˆãƒ©ãƒ–ãƒ«ã‚’èª¿æŸ»ã™ã‚‹éš›ã«å½¹ç«‹ã¤ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã«ã¤ã„ã¦æ›¸ã„ã¦ã¿ãŸã„ã¨æ€ã„ã¾ã™ã€‚ ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã£ã¦ä½•ï¼Ÿ ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã¨ã¯ã€ã‚ã‚‹æ™‚ç‚¹ã®å…¨ã¦ã®ã‚¹ãƒ¬ãƒƒãƒ‰ã®ã‚¹ã‚¿ãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ã‚’å‡ºåŠ›ã—ãŸã‚‚ã®ã§ã™ã€‚ ã‚¹ã‚¿ãƒƒã‚¯ãƒˆãƒ¬ãƒ¼ã‚¹ã¨ã¯ç¾åœ¨ã®ã‚¹ãƒ¬ãƒƒãƒ‰ã®ãƒ¡ã‚½ãƒƒãƒ‰ã®å‘¼ã³å‡ºã—éšŽå±¤ã‚’å‡ºåŠ›ã—ãŸã‚‚ã®ã§ã€ä¾‹å¤–ãŒç™ºç”Ÿã—ãŸæ™‚ãªã‚“ã‹ã«ã‚ˆãè¦‹ã‹ã‘ã‚‹ã‚¢ãƒ¬ã®ã“ã¨ã§ã™ã€‚ javaãƒ—ãƒã‚»ã‚¹å†…éƒ¨ã§ã¯è¤‡æ•°ã®ã‚¹ãƒ¬ãƒƒãƒ‰ãŒä¸¦åˆ—ã«å‡¦ç†ã‚’è¡Œã£ã¦ã„ã¾ã™ã€‚ Tomcatãªã©ã®ã‚µãƒ¼ãƒ–ãƒ¬ãƒƒãƒˆã¯è¤‡æ•°ã®ã‚¹ãƒ¬ãƒƒãƒ‰ã‚’ä½¿ã£ã¦ãƒªã‚¯ã‚¨ã‚¹ãƒˆã‚’å‡¦ç†ã—ã¾ã™ã—ã€ã‚·ãƒ³ã‚°ãƒ«ã‚¹ãƒ¬ãƒƒãƒ‰ã®ã‚·ãƒ³ãƒ—ãƒ«ãªã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã§ã‚‚GCãªã©ã®å‡¦ç†ã¯å°‚ç”¨ã®ã‚¹ãƒ¬ãƒƒãƒ‰ãŒå‡¦ç†ã‚’è¡Œã£ã¦ã„ã¾ã™ã€‚ ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã‚’å–å¾—ã™ã‚‹ã¨ã¯ã€ãƒ—ãƒã‚»ã‚¹å†…ã®å…¨ã‚¹ãƒ¬ãƒƒãƒ‰ã«å¯¾ã—ã¦ã€Œã¡ã‚‡ã£ã¨ãŠå‰ã‚‰ã€ä»Šä½•
tacke 2017/07/31
java
ãƒªãƒ³ã‚¯
HeapStats/jp - IcedTea
1 ãƒ‹ãƒ¥ãƒ¼ã‚¹ OpenJDK8ç³»ã® 8u262 ä»¥é™ã®ç‰ˆã¨ã¨ã‚‚ã«ä½¿ç”¨ã—ãªã„ã§ãã ã•ã„ (2020/7/24) OpenJDK 8u262 ã¯ã€ç´ æ™´ã‚‰ã—ã„ã“ã¨ã«ã€ã„ãã¤ã‹ã®ãƒ‡ã‚£ã‚¹ãƒˆãƒªãƒ“ãƒ¥ãƒ¼ã‚·ãƒ§ãƒ³ã§ JDK Flight Recorder (JFR) ãŒåŒæ¢±ã•ã‚Œã¾ã—ãŸã€‚ ã—ã‹ã—ã€æ®‹å¿µãªã“ã¨ã«ã€HeapStats ã¯ 8u262 ä»¥é™ã§ã¯ã†ã¾ãå‹•ä½œã—ã¾ã›ã‚“ã€‚ 8u262 ä»¥é™ã§ã®Javaãƒ’ãƒ¼ãƒ—ã®ç¢ºèªã«ã¯ã€JFRã®ä½¿ç”¨ã‚’ãŠå‹§ã‚ã—ã¾ã™ã€‚ è©³ã—ãã¯ã€ã“ã®ãƒšãƒ¼ã‚¸ã®ä¸‹ã®å®Ÿè¡Œç’°å¢ƒã‚»ã‚¯ã‚·ãƒ§ãƒ³ã‚’ã”å‚ç…§ãã ã•ã„ã€‚ ã“ã¡ã‚‰ã‚‚ã¾ãŸã”è¦§ãã ã•ã„ã€‚ http://icedtea.classpath.org/pipermail/heapstats/2020-July/002457.html {Exit|Crash}OnOutOfMemoryError ã‚’ HeapStats ã¨å…±ã«ä½¿ã‚ãªã„ã§ãã ã•ã„(2019/7/25)
tacke 2017/07/28
java

jvm

heapstats
ãƒªãƒ³ã‚¯
Javaãƒˆãƒ©ãƒ–ãƒ«ã«å¿œã˜ãŸåˆå‹•å¯¾å¿œã®ã¾ã¨ã‚ - n-agetsumaã®æ—¥è¨˜
Javaãƒˆãƒ©ãƒ–ãƒ«ã§ã¯ã€Žæƒ…å ±ãŒãªãã¦ã€å†ç¾ã‚‚ãªã‹ãªã‹ã—ã¾ã›ã‚“ã€ã¨ã„ã£ãŸçŠ¶æ³ã«é™¥ã‚‹ã“ã¨ãŒã‚ã‚‹ã€‚ã“ã®ã‚ˆã†ãªçŠ¶æ³ã‚’å›žé¿ã™ã‚‹ãŸã‚ã«ã€ä»¥ä¸‹ã®3ã¤ã®ä»£è¡¨çš„ãªãƒˆãƒ©ãƒ–ãƒ«ã‚’ä¾‹ã«ã€ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‚µãƒ¼ãƒã‚’å†èµ·å‹•ã™ã‚‹å‰ã«ä½•ã‚’å–å¾—ã™ã‚Œã°è‰¯ã„ã®ã‹ã‚’ã¾ã¨ã‚ã¦ã¿ã‚‹ã€‚ ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‹ã‚‰å¿œç”ãŒãªã„ ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ãŒé…ã„ ãƒ’ãƒ¼ãƒ—ãƒ¡ãƒ¢ãƒªãŒè¶³ã‚Šãªã„(OutOfMemoryErrorã®ç™ºç”Ÿ) ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‹ã‚‰å¿œç”ãŒãªã„ å–å¾—ã™ã‚‹æƒ…å ± ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ— ãƒ‡ãƒ¼ã‚¿å–å¾—æ–¹æ³• ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã¨ã¯ã€ã‚³ãƒžãƒ³ãƒ‰å®Ÿè¡Œæ™‚ç‚¹ã§ã®Javaã‚¹ãƒ¬ãƒƒãƒ‰å®Ÿè¡ŒçŠ¶æ…‹ã‚’å‡ºåŠ›ã—ãŸã‚‚ã®ã§ã‚ã‚‹ã€‚å¿œç”ãŒãªã„å ´åˆã€ä½•ã‚‰ã‹ã®è¦å› ã«ã‚ˆã‚Šã©ã“ã‹ã§å‡¦ç†ãŒæ¢ã¾ã£ã¦ã„ã‚‹ã“ã¨ãŒæƒ³å®šã•ã‚Œã‚‹ã€‚ã‚¹ãƒ¬ãƒƒãƒ‰ãƒ€ãƒ³ãƒ—ã¯ã€Žã©ã“ã§æ¢ã¾ã£ã¦ã„ã‚‹ã®ã‹ï¼Ÿã€ã‚’åˆ‡ã‚Šåˆ†ã‘ã‚‹ã®ã«å¤§åˆ‡ãªæƒ…å ±ã§ã‚ã‚‹ã€‚ å–å¾—æ–¹æ³•ã¯JDKã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã«ã‚ˆã£ã¦è‰²ã€…ã‚ã‚‹ã€‚ kill -3 <pid> (å°‘ãªãã¨ã‚‚1.4.2ã«ã¯ã‚ã‚‹ã€œJDK7ã§ã‚‚
tacke 2017/07/28
java

jvm
ãƒªãƒ³ã‚¯
Class JavaLaunchHelper is implemented in two places
tacke 2017/06/30
java
ãƒªãƒ³ã‚¯
ã‚³ãƒ³ãƒ†ã‚ã‚¹ãƒˆã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã£ã¦ä½•ã ? - masugata_kã®æ—¥è¨˜
ã‚·ã‚¹ãƒ†ãƒ ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã¨ä¼¼ãŸã‚ˆã†ãªã‚‚ã®ã«ã€ã€Œ(ã‚¹ãƒ¬ãƒƒãƒ‰ã®) ã‚³ãƒ³ãƒ†ã‚ã‚¹ãƒˆã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ (context class loader)ã€ã¨ã„ã†ã‚‚ã®ãŒã‚ã‚‹ã€‚å‰ã€…ã‹ã‚‰åå‰ã ã‘ã¯çŸ¥ã£ã¦ã„ãŸã®ã ãŒã€ç‰¹ã«å¿…è¦ã¨ã™ã‚‹æ©Ÿä¼šã‚‚ãªã‹ã£ãŸã®ã§ä½•ãªã®ã‹ã¯çŸ¥ã‚‰ãªã„ã¾ã¾ã ã£ãŸã€‚ä»Šå›žã€ã‚·ã‚¹ãƒ†ãƒ ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ãŒä½•ãªã®ã‹ã‚’èª¿ã¹ãŸã¤ã„ã§ã«ã“ã¡ã‚‰ã‚‚èª¿ã¹ãŸã®ã§ã€ã“ã‚Œã‚‚å¿˜ã‚Œãªã„ã‚ˆã†ã«æ›¸ã„ã¦ãŠãã€‚ ãã®ã‚¹ãƒ¬ãƒƒãƒ‰ã§ä½¿ã‚ã‚Œã‚‹ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã€ã§ã¯ãªã„ æ™‚æŠ˜è¦‹ã‹ã‘ã‚‹é–“é•ã„ã¨ã—ã¦ã€ã€Œã‚¹ãƒ¬ãƒƒãƒ‰ã®ã‚³ãƒ³ãƒ†ã‚ã‚¹ãƒˆã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã¯ã€ãã®ã‚¹ãƒ¬ãƒƒãƒ‰å†…ã§ç™ºç”Ÿã™ã‚‹ã‚¯ãƒ©ã‚¹ã‚„ãƒªã‚½ãƒ¼ã‚¹ã®ãƒãƒ¼ãƒ‰è¦æ±‚ã‚’å‡¦ç†ã™ã‚‹ã€ã¨ã„ã†ã‚‚ã®ãŒã‚ã‚‹: ã€Žã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã‚µãƒ¼ãƒ–ãƒ¬ãƒƒãƒˆ-TECHSCORE-ã€ ã¨ã“ã‚ã§ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã¯ãƒ¡ã‚¤ãƒ³ã‚¹ãƒ¬ãƒƒãƒ‰ã‚‚å«ã‚ã¦ã€å¿…ãšï¼‘ã¤ã€Œã‚³ãƒ³ãƒ†ã‚¯ã‚¹ãƒˆãƒ»ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã€ã‚’æŒã¡ã¾ã™ã€‚ã‚³ãƒ³ãƒ†ã‚ã‚¹ãƒˆãƒ»ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã¨ã¯ã€ãã®ã‚¹ãƒ¬ãƒƒãƒ‰å†…ã§ã‚¯ãƒ©ã‚¹ã‚’ãƒãƒ¼ãƒ‰ã™ã‚‹å ´åˆã«ä½¿ç”¨ã•ã‚Œã‚‹ã‚¯ãƒ©ã‚¹ãƒãƒ¼ãƒ€ã®ã“ã¨
tacke 2016/09/20
java

classloader
ãƒªãƒ³ã‚¯
YourKit Profiler
Fully featured low overhead profiler for Java EE and Java SE platforms.
tacke 2016/09/14
java
ãƒªãƒ³ã‚¯
How can I restart a Java application?
tacke 2016/06/22
java
ãƒªãƒ³ã‚¯
How to make your java application restarts itself
tacke 2016/06/22
java
ãƒªãƒ³ã‚¯
Programmatically Restart a Java Application
Today I'll talk about a famous probl em : restarting a Java application. It is especially useful when changing the language of a GUI application, so that we need to restart it to reload the internationalized messages in the new language. Some look and feel also require to relaunch the application to be properly applied. A quick Google search give plenty answers using a simple : Runtime.getRuntime()
tacke 2016/06/22
java
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SonnarQubeã‚’ä½¿ã£ã¦æœ‰åã©ã“ã‚Javaãƒ•ãƒ¬ãƒ¼ãƒ ãƒ¯ãƒ¼ã‚¯ã®å“è³ªã‚’è§£æžã—ã¦ã¿ãŸ
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tacke 2016/06/02
spring

java

SonarQube
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Javaã®è¬Žã®ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹åŠ£åŒ–ç¾è±¡ã¨ã®æˆ¦ã„ - Cybozu Inside Out | ã‚µã‚¤ãƒœã‚¦ã‚ºã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã®ãƒ–ãƒã‚°
ã“ã‚“ã«ã¡ã¯ã€‚ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³åŸºç›¤ãƒãƒ¼ãƒ ã®æ¨ªç”°ã§ã™ã€‚ Javaã®è¬Žã®ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹åŠ£åŒ–ã«ã¾ã¤ã‚ã‚‹èª¿æŸ»ã‚’ã—ã¦ã„ãŸã®ã§ã™ãŒã€1ãƒ¶æœˆã®è‹¦åŠ´ã®æœ«ã«åŽŸå› ãŒã‚ã‹ã‚Šã¾ã—ãŸã®ã§ã€å ±å‘Šã•ã›ã¦ã„ãŸã ãã¾ã™ï¼ å…¬é–‹å¾Œã«é ‚ã„ãŸã¯ã¦ãªãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ã§ã®ã”æŒ‡æ‘˜ãƒ»ç¤¾å†…ã§ã®ã‚¿ã‚¤ãƒãƒ»èªã¿ã«ãã„ãªã©ã®æŒ‡æ‘˜ã‚’å—ã‘ã¦ãŸã®ã§ã€è¬¹ã‚“ã§ä¿®æ£ã•ã›ã„ãŸã ãã¾ã™ã€‚ ä¿®æ£ã—ãŸå†…å®¹ã«ã¤ãã¾ã—ã¦ã¯ã€è¨˜äº‹ã®æœ€å¾Œã‚’å‚ç…§ã—ã¦ãã ã•ã„ã€‚ å¿™ã—ã„äººã®ãŸã‚ã®ã¾ã¨ã‚ jdk-7u4ä»¥é™ã®jdk-7 *1 ã§Javaã®ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ãŒåŠ£åŒ–ã™ã‚‹è¬Žã®ç¾è±¡ CodeCacheã®å®¹é‡é™ç•Œã«è¿‘ã¥ãã¨JITã‚³ãƒ³ãƒ‘ã‚¤ãƒ©ã‚’åœæ¢ã—ã¦ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«ã—ãŸã‚³ãƒ¼ãƒ‰ã‚’æ¨ã¦ã‚‹æ©Ÿèƒ½ãŒåŽŸå› ã ã£ãŸ èµ·å‹•ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã§å›žé¿ã§ãã‚‹ã®ã§ã€é•·æœŸé‹ç”¨ã™ã‚‹ã¨ãã¯ -XX:-UseCodeCacheFlushing, -XX:ReservedCodeCacheSize=128m ã‚’ã¤ã‘ã‚‹ ä¸Šã®ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã‚’è¨å®šã—ãŸæ™‚ã«ã€C
tacke 2016/05/26
java

jvm
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Fluencyã¨ã„ã†Yet another fluent Java loggerã‚’ä½œã£ãŸè©± - komamitsu.log
ã“ã®è¨˜äº‹ã¯ã€Fluentd Advent Calendar 2015 - Qiita ã®ä¸ƒæ—¥ç›®ã®è¨˜äº‹ã§ã™ã€‚ å…ˆæ—¥ã€komamitsu/fluency Â· GitHub ã¨ã„ã†Fluentd (in_forward) ç”¨ã®Java loggerã‚’ä½œã£ã¦ã¿ã¾ã—ãŸã€‚ å…ƒã€…ã€fluent/fluent-logger-java Â· GitHub ã®é–‹ç™ºã‚’è¦‹ã¦ã„ãŸã®ã§ã™ãŒã€Fluentd MLã§è‰²ã€…ã¨è¦æœ›ãŒã‚ã£ã¦æ©Ÿèƒ½ã‚’æ‹¡å¼µã—ãŸã„æ¬²ãŒé«˜ã¾ã£ãŸã‚‚ã®ã®æ—¢å˜ã®å®Ÿè£…çš„ã«é¢å€’è‡ãã†ãªæ„Ÿã˜ã ã£ãŸã®ã§ã€ã¤ã„ã‚«ãƒƒã¨ãªã£ã¦ã‚¼ãƒã‹ã‚‰æ›¸ã„ã¦ã—ã¾ã„ã¾ã—ãŸã€‚ ç‰¹å¾´ ç‰¹å¾´ã¨ã—ã¦ã¯ä»¥ä¸‹ã®ã‚‚ã®ãŒã‚ã‚Šã¾ã™ã€‚ é€šå¸¸ (fluent/fluent-logger-java Â· GitHub) ã‚ˆã‚Šä¸‰å€é€Ÿã„ fluency_benchmark.md Â· GitHub å‚ç…§ (å¾Œè¿°ã™ã‚‹PackedForwardã‚’åˆ©ç”¨ã—ãŸå ´åˆ) Fluentdã¸ã®
tacke 2016/05/23
â€œè¤‡æ•°ã®Fluentdã‚’æŒ‡å®šã—failoverã™ã‚‹ã“ã¨ãŒå¯èƒ½â€

fluentd

java
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Java 8ã‚’ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã—ãŸã‚‰ã€sbtã§MaxMetaspaceSizeã‚’è¨å®šã™ã‚‹ï¼Ÿ - CLOVERðŸ€
sbtã‚’ãƒžãƒ‹ãƒ¥ã‚¢ãƒ«ã«æ²¿ã£ã¦æ¨™æº–çš„ãªè¨å®šã—ã¦ã„ã‚‹ã¨ã€ã ã„ãŸã„Permanentã‚’æ‹¡å¼µã—ã¦ã„ã‚‹ã¨æ€ã„ã¾ã™ã€‚ SBT_OPTS="-Xms512M -Xmx1536M -Xss1M -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=256M" java $SBT_OPTS -jar `dirname $0`/sbt-launch.jar "$@" Setup#Manual Installation http://www.scala-sbt.org/release/docs/Getting-Started/Setup.html#manual-installation ã§ã€Java 8ã‚’ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã—ã¦sbtã‚’èµ·å‹•ã™ã‚‹ã¨ã€ã“ã‚“ãªæ„Ÿã˜ã§è¦å‘Šã•ã‚Œã¾ã™ã€‚ $ sbt Java HotSpot(TM) 64-Bit Server VM warning: ignori
tacke 2016/04/22
java

java8
ãƒªãƒ³ã‚¯
Java8ã®HotSpotVMã‹ã‚‰Permanenté ˜åŸŸãŒæ¶ˆãˆãŸç†ç”±ã¨ãã®å½±éŸ¿ | ã‚®ãƒ¼ã‚¯ã‚’ç›®æŒ‡ã—ã¦
ä»Šå›žã‚‚å‰å›žã®è¨˜äº‹ã«ã¤ã¥ãã€Java8ã«ã‚ˆã‚‹å¤‰æ›´ç‚¹ã§æœªã ã‚ã¾ã‚Šç´¹ä»‹ã•ã‚Œã¦ã„ãªã„ãƒã‚¤ãƒ³ãƒˆã‚’è¨˜äº‹ã«ã—ã‚ˆã†ã¨æ€ã†ã€‚ ä»Šå›žã¯Java8ã®HotSpotVMã®è©±ã€‚Java8ã§ã¯JEP122ãŒå–ã‚Šè¾¼ã¾ã‚Œã€VMã®ãƒ¡ãƒ¢ãƒªãƒ¢ãƒ‡ãƒ«ãŒå¤‰æ›´ã•ã‚ŒãŸã€‚JEP122ã®ã‚¿ã‚¤ãƒˆãƒ«ã€ŒRemove the Permanent Generationã€ã‹ã‚‰æƒ³åƒã§ãã‚‹ã¨ãŠã‚Šã€Java8ã®HotSpotVMã‹ã‚‰ã¯å¾“æ¥ã®Permanenté ˜åŸŸãŒç„¡ããªã£ãŸã€‚ ãªãœã€ã“ã†ã„ã£ãŸå¤‰æ›´ãŒè¡Œã‚ã‚ŒãŸã®ã ã‚ã†ã‹ï¼Ÿã¾ãŸã€å…ƒã€…Permanenté ˜åŸŸã«æ ¼ç´ã•ã‚Œã¦ã„ãŸæƒ…å ±ã¯ä½•å‡¦ã«ã„ã£ã¦ã—ã¾ã£ãŸã®ã‹ï¼ŸJVMä»˜å±žã®ãƒ„ãƒ¼ãƒ«ã«ã©ã†ã„ã£ãŸå½±éŸ¿ãŒã‚ã‚‹ã®ã‹ï¼Ÿ ä»Šå›žã®è¨˜äº‹ã§ã¯ã“ã®ç‚¹ã‚’ã¾ã¨ã‚ã¦ã„ã“ã†ã¨æ€ã†ã€‚ ãªãŠã€HotSpotVMã®ãƒ¡ãƒ¢ãƒªãƒ¢ãƒ‡ãƒ«ã«ã¤ã„ã¦è©³ã—ããªã„æ–¹ã¯ã€å…ˆã«ã“ã¡ã‚‰ã®é …ç•ªï¼ˆã€Œè£œè¶³ â€“ HotSpotVMã®ãƒ¡ãƒ¢ãƒªæ§‹é€ æ¦‚èª¬ï¼‰ã‚’èªã‚“ã§ã„ãŸã ãã¨ã‚¹ãƒ ãƒ¼ã‚ºã«èªã¿é€²ã‚ã‚‰ã‚Œã‚‹ã
tacke 2016/04/22
java8

java
ãƒªãƒ³ã‚¯
Scala vs. Java: Why Should I Learn Scala? | ToptalÂ®
There is admittedly some truth to the statement that â€œScala is hardâ€, but the learning curve is well worth the investment. Some of the more complex features of the language (Tuples, Functions, Mac ros, to name a few) ultimately make it easier for the developer to write better code and increase performance by programming in Scala. Frankly, we are programmers, and if weâ€™re not smart enough to learn a
tacke 2016/01/28
Scala

Java
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