{"id":636,"date":"2024-11-14T11:10:44","date_gmt":"2024-11-14T02:10:44","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=636"},"modified":"2025-03-24T08:52:57","modified_gmt":"2025-03-23T23:52:57","slug":"%e3%80%90%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%e3%80%91java%e3%81%ae%e3%83%a1%e3%83%a2%e3%83%aa%e7%ae%a1%e7%90%86%e3%82%92%e5%ae%8c%e5%85%a8%e7%90%86%e8%a7%a3%ef%bc%81%e7%8f%be%e5%a0%b4","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=636","title":{"rendered":"\u3010\u5b8c\u5168\u30ac\u30a4\u30c9\u3011Java\u306e\u30e1\u30e2\u30ea\u7ba1\u7406\u3092\u5b8c\u5168\u7406\u89e3\uff01\u73fe\u5834\u3067\u4f7f\u3048\u308b7\u3064\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af"},"content":{"rendered":"<div id=\"sgb-css-id-1\">\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">\u306f\u3058\u3081\u306b<\/a>  <\/li>  <li>    <a href=\"#i-1\">\uff11\uff0eJava\u306e\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-2\">1.1 JVM\u306e\u30e1\u30e2\u30ea\u69cb\u9020\u3092\u56f3\u89e3\u3067\u7406\u89e3\u3059\u308b<\/a>      <\/li>      <li>        <a href=\"#i-3\">1.2 \u5404\u30e1\u30e2\u30ea\u9818\u57df\u306e\u5f79\u5272\u3068\u7279\u5fb4\u3092\u89e3\u8aac<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-6\">1.3 \u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u4ed5\u7d44\u307f\u3068\u52d5\u4f5c\u30bf\u30a4\u30df\u30f3\u30b0<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-10\">\uff12\uff0e\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u539f\u56e0\u3068\u5bfe\u7b56\u65b9\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-11\">2.1 \u3088\u304f\u3042\u308b\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u30d1\u30bf\u30fc\u30f35\u9078<\/a>      <\/li>      <li>        <a href=\"#i-15\">2.2 \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u767a\u898b\u306e\u305f\u3081\u306e\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u624b\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-18\">2.3 \u5b9f\u8df5\u7684\u306a\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u5bfe\u7b56\u306e\u5b9f\u88c5\u4f8b<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-21\">\uff13\uff0eOutOfMemoryError\u3078\u306e\u5bfe\u51e6\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-22\">3.1 \u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304b\u3089\u539f\u56e0\u3092\u7279\u5b9a\u3059\u308b\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-25\">3.2 \u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\u306e\u53d6\u5f97\u3068\u89e3\u6790\u624b\u9806<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-29\">3.3 \u30e1\u30e2\u30ea\u8a2d\u5b9a\u306e\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u30dd\u30a4\u30f3\u30c8<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-32\">\uff14\uff0e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305f\u30e1\u30e2\u30ea\u7ba1\u7406<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-33\">4.1 \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u624b\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-37\">4.2 \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u306e\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051<\/a>      <\/li>      <li>        <a href=\"#i-40\">4.3 \u30ad\u30e3\u30c3\u30b7\u30e5\u6226\u7565\u306e\u8a2d\u8a08\u3068\u5b9f\u88c5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-44\">4.4 \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-45\">\uff15\uff0e\u5b9f\u8df5\u7684\u306a\u30e1\u30e2\u30ea\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-46\">5.1 \u5927\u91cf\u30c7\u30fc\u30bf\u51e6\u7406\u6642\u306e\u30e1\u30e2\u30ea\u7ba1\u7406\u8853<\/a>      <\/li>      <li>        <a href=\"#i-49\">5.2 \u30de\u30a4\u30af\u30ed\u30b5\u30fc\u30d3\u30b9\u306b\u304a\u3051\u308b\u30e1\u30e2\u30ea\u8a2d\u8a08<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-52\">5.3 \u30af\u30e9\u30a6\u30c9\u74b0\u5883\u3067\u306e\u30e1\u30e2\u30ea\u8a2d\u5b9a\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-56\">\uff16\uff0e\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-57\">6.1 \u30e1\u30e2\u30ea\u95a2\u9023\u554f\u984c\u306e\u5207\u308a\u5206\u3051\u624b\u9806<\/a>      <\/li>      <li>        <a href=\"#i-60\">6.2 \u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0\u30c4\u30fc\u30eb\u306e\u6d3b\u7528\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-63\">6.3 \u5b9f\u969b\u306e\u30c8\u30e9\u30d6\u30eb\u4e8b\u4f8b\u3068\u89e3\u6c7a\u7b56<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-67\">\uff17\uff0e\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u672a\u6765\u3068\u6700\u65b0\u30c8\u30ec\u30f3\u30c9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-68\">7.1 Java 17\u4ee5\u964d\u306e\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u9032\u5316<\/a>      <\/li>      <li>        <a href=\"#i-71\">7.2 \u30b3\u30f3\u30c6\u30ca\u74b0\u5883\u306b\u304a\u3051\u308b\u6700\u9069\u306a\u30e1\u30e2\u30ea\u8a2d\u5b9a<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-74\">7.3 \u6b21\u4e16\u4ee3\u306e\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u6280\u8853<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-76\">\u307e\u3068\u3081\uff1a\u52b9\u679c\u7684\u306aJava\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u5b9f\u73fe\u306b\u5411\u3051\u3066<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-77\">\u672c\u8a18\u4e8b\u306e\u30dd\u30a4\u30f3\u30c8\u6574\u7406<\/a>      <\/li>      <li>        <a href=\"#i-81\">\u73fe\u5834\u3067\u306e\u5b9f\u8df5\u306b\u5411\u3051\u305f\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/a>      <\/li>      <li>        <a href=\"#i-82\">\u4eca\u5f8c\u306e\u5b66\u7fd2\u306e\u305f\u3081\u306b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-86\">\u6700\u5f8c\u306b<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">\u306f\u3058\u3081\u306b<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-2\">\n<p>Java\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5b89\u5b9a\u6027\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5de6\u53f3\u3059\u308b\u91cd\u8981\u306a\u8981\u7d20\u3001\u305d\u308c\u304c\u30e1\u30e2\u30ea\u7ba1\u7406\u3067\u3059\u3002\u9069\u5207\u306a\u30e1\u30e2\u30ea\u7ba1\u7406\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5fdc\u7b54\u6027\u5411\u4e0a\u3001\u30ea\u30bd\u30fc\u30b9\u52b9\u7387\u306e\u6700\u9069\u5316\u3001\u305d\u3057\u3066\u904b\u7528\u30b3\u30b9\u30c8\u306e\u524a\u6e1b\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002\u4e00\u65b9\u3067\u3001\u4e0d\u9069\u5207\u306a\u30e1\u30e2\u30ea\u7ba1\u7406\u306f\u6df1\u523b\u306a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u554f\u984c\u3084\u30b7\u30b9\u30c6\u30e0\u969c\u5bb3\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-3\">\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001Java\u306e\u30e1\u30e2\u30ea\u7ba1\u7406\u306b\u3064\u3044\u3066\u3001\u57fa\u790e\u304b\u3089\u5b9f\u8df5\u7684\u306a\u30c6\u30af\u30cb\u30c3\u30af\u307e\u3067\u3001\u4f53\u7cfb\u7684\u306b\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-9\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u672c\u8a18\u4e8b\u3067\u5b66\u3079\u308b\u3053\u3068<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ul class=\"wp-block-list\"><div id=\"sgb-css-id-4\">\n<li>JVM\u306e\u30e1\u30e2\u30ea\u69cb\u9020\u3068\u5404\u9818\u57df\u306e\u5f79\u5272<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-5\">\n<li>\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u767a\u898b\u3068\u5bfe\u7b56\u65b9\u6cd5<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-6\">\n<li>OutOfMemoryError\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-7\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u305f\u30e1\u30e2\u30ea\u6700\u9069\u5316\u624b\u6cd5<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-8\">\n<li>\u5b9f\u52d9\u3067\u4f7f\u3048\u308b\u30e1\u30e2\u30ea\u7ba1\u7406\u30c6\u30af\u30cb\u30c3\u30af<\/li>\n<\/div>\n\n\n<li>\u6700\u65b0\u306e\u30e1\u30e2\u30ea\u7ba1\u7406\u30c8\u30ec\u30f3\u30c9\u3068\u5c06\u6765\u5c55\u671b<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-10\">\n<p>\u3053\u306e\u30ac\u30a4\u30c9\u3067\u306f\u3001\u7406\u8ad6\u7684\u306a\u8aac\u660e\u3060\u3051\u3067\u306a\u304f\u3001\u5b9f\u8df5\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3084\u5177\u4f53\u7684\u306a\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u624b\u6cd5\u3082\u7d39\u4ecb\u3057\u307e\u3059\u3002\u5404\u30bb\u30af\u30b7\u30e7\u30f3\u306f\u3001\u57fa\u790e\u304b\u3089\u5fdc\u7528\u3078\u3068\u6bb5\u968e\u7684\u306b\u9032\u3093\u3067\u3044\u304f\u305f\u3081\u3001\u81ea\u5206\u306e\u30ec\u30d9\u30eb\u306b\u5408\u308f\u305b\u3066\u5b66\u7fd2\u3092\u9032\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-11\">\n<p>\u305d\u308c\u3067\u306f\u3001Java\u306e\u30e1\u30e2\u30ea\u7ba1\u7406\u306b\u3064\u3044\u3066\u3001\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-12\">\n<h2 class=\"wp-block-heading\" id=\"i-1\">\uff11\uff0eJava\u306e\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-13\">\n<h3 class=\"wp-block-heading\" id=\"i-2\">1.1 JVM\u306e\u30e1\u30e2\u30ea\u69cb\u9020\u3092\u56f3\u89e3\u3067\u7406\u89e3\u3059\u308b<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-14\">\n<p>Java\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3059\u308b\u969b\u3001JVM\uff08Java Virtual Machine\uff09\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u69cb\u9020\u3067\u30e1\u30e2\u30ea\u3092\u7ba1\u7406\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">graph TD\n    A[JVM\u30e1\u30e2\u30ea\u69cb\u9020] --&gt; B[\u30d2\u30fc\u30d7\u9818\u57df]\n    A --&gt; C[\u975e\u30d2\u30fc\u30d7\u9818\u57df]\n    B --&gt; D[Young Generation]\n    B --&gt; E[Old Generation]\n    D --&gt; F[Eden Space]\n    D --&gt; G[Survivor Space 1]\n    D --&gt; H[Survivor Space 2]\n    C --&gt; I[\u30e1\u30bd\u30c3\u30c9\u9818\u57df]\n    C --&gt; J[\u30b9\u30bf\u30c3\u30af\u9818\u57df]\n    C --&gt; K[PC Register]\n    C --&gt; L[Native Method Stack]<\/pre>\n\n\n<div id=\"sgb-css-id-15\">\n<h3 class=\"wp-block-heading\" id=\"i-3\">1.2 \u5404\u30e1\u30e2\u30ea\u9818\u57df\u306e\u5f79\u5272\u3068\u7279\u5fb4\u3092\u89e3\u8aac<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-16\">\n<h4 class=\"wp-block-heading\" id=\"i-4\">1. \u30d2\u30fc\u30d7\u9818\u57df\uff08Heap Area\uff09<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-17\">\n<p>\u3000\u25cf <strong>Young Generation<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-18\">\n<p>\u3000\u3000\u25cf Eden Space\uff1a \u65b0\u898f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5272\u308a\u5f53\u3066\u9818\u57df<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-19\">\n<p>\u3000\u3000\u25cf Survivor Space\uff1a Minor GC\u5f8c\u3082\u751f\u5b58\u3057\u3066\u3044\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4fdd\u7ba1\u9818\u57df<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-20\">\n<p>\u3000\u25cf <strong><strong>Old Generation<\/strong><\/strong>\uff1a \u9577\u671f\u9593\u751f\u5b58\u3057\u3066\u3044\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4fdd\u7ba1\u9818\u57df<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-21\">\n<h4 class=\"wp-block-heading\" id=\"i-5\">2. \u975e\u30d2\u30fc\u30d7\u9818\u57df\uff08Non-Heap Area\uff09<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-22\">\n<p>\u3000\u25cf <strong>\u30e1\u30bd\u30c3\u30c9\u9818\u57df<\/strong>\uff1a \u30af\u30e9\u30b9\u60c5\u5831\u3084\u30e1\u30bd\u30c3\u30c9\u60c5\u5831\u3092\u683c\u7d0d<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-23\">\n<p>\u3000\u25cf <strong>\u30b9\u30bf\u30c3\u30af\u9818\u57df<\/strong>\uff1a \u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u3084\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3092\u7ba1\u7406<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-24\">\n<p>\u3000\u25cf <strong>PC Register<\/strong>\uff1a \u73fe\u5728\u5b9f\u884c\u4e2d\u306e\u547d\u4ee4\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u4fdd\u6301<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-25\">\n<p>\u3000\u25cf <strong><strong>Native Method Stack<\/strong><\/strong>\uff1a<strong> <\/strong>\u30cd\u30a4\u30c6\u30a3\u30d6\u30e1\u30bd\u30c3\u30c9\u5b9f\u884c\u7528\u306e\u30b9\u30bf\u30c3\u30af<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-26\">\n<h3 class=\"wp-block-heading\" id=\"i-6\">1.3 \u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u4ed5\u7d44\u307f\u3068\u52d5\u4f5c\u30bf\u30a4\u30df\u30f3\u30b0<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-27\">\n<h4 class=\"wp-block-heading\" id=\"i-7\">GC\u306e\u57fa\u672c\u30d7\u30ed\u30bb\u30b9<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-28\">\n<p><strong>\u30001. Minor GC<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-29\">\n<p>\u3000\u3000\u25cf Young Generation\u5185\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5bfe\u8c61<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-30\">\n<p>\u3000\u3000\u25cf \u9ad8\u983b\u5ea6\u3067\u767a\u751f\uff08\u6570\u79d2\u301c\u6570\u5341\u79d2\u9593\u9694\uff09<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-31\">\n<p>\u3000\u3000\u25cf Stop-the-World\u6642\u9593\u304c\u77ed\u3044<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-32\">\n<p><strong>\u30002. Major GC\uff08Full GC\uff09<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-33\">\n<p>\u3000\u3000\u25cf Old Generation\u5168\u4f53\u3092\u5bfe\u8c61<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-34\">\n<p>\u3000\u3000\u25cf \u4f4e\u983b\u5ea6\u3067\u767a\u751f<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-35\">\n<p>\u3000\u3000\u25cf Stop-the-World\u6642\u9593\u304c\u9577\u3044<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-36\">\n<h4 class=\"wp-block-heading\" id=\"i-8\">\u5b9f\u88c5\u4f8b\uff1a\u30e1\u30e2\u30ea\u4f7f\u7528\u72b6\u6cc1\u306e\u76e3\u8996<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class MemoryMonitor {\n    public static void printMemoryStats() {\n        Runtime runtime = Runtime.getRuntime();\n\n        \/\/ \u73fe\u5728\u306e\u7a7a\u304d\u30e1\u30e2\u30ea\u91cf\u3092\u53d6\u5f97\n        long freeMemory = runtime.freeMemory();\n\n        \/\/ \u5272\u308a\u5f53\u3066\u6e08\u307f\u30e1\u30e2\u30ea\u91cf\u3092\u53d6\u5f97\n        long totalMemory = runtime.totalMemory();\n\n        \/\/ \u4f7f\u7528\u4e2d\u306e\u30e1\u30e2\u30ea\u91cf\u3092\u8a08\u7b97\n        long usedMemory = totalMemory - freeMemory;\n\n        \/\/ \u6700\u5927\u30e1\u30e2\u30ea\u91cf\u3092\u53d6\u5f97\n        long maxMemory = runtime.maxMemory();\n\n        System.out.println(\"===== \u30e1\u30e2\u30ea\u4f7f\u7528\u72b6\u6cc1 =====\");\n        System.out.printf(\"\u4f7f\u7528\u4e2d\u30e1\u30e2\u30ea: %d MB%n\", usedMemory \/ 1024 \/ 1024);\n        System.out.printf(\"\u7a7a\u304d\u30e1\u30e2\u30ea: %d MB%n\", freeMemory \/ 1024 \/ 1024);\n        System.out.printf(\"\u5272\u308a\u5f53\u3066\u6e08\u307f\u30e1\u30e2\u30ea: %d MB%n\", totalMemory \/ 1024 \/ 1024);\n        System.out.printf(\"\u6700\u5927\u30e1\u30e2\u30ea: %d MB%n\", maxMemory \/ 1024 \/ 1024);\n    }\n\n    public static void main(String[] args) {\n        \/\/ \u30e1\u30e2\u30ea\u4f7f\u7528\u72b6\u6cc1\u3092\u8868\u793a\n        printMemoryStats();\n\n        \/\/ GC\u3092\u660e\u793a\u7684\u306b\u8981\u6c42\uff08\u5b9f\u904b\u7528\u3067\u306f\u63a8\u5968\u3055\u308c\u306a\u3044\uff09\n        System.gc();\n\n        \/\/ GC\u5f8c\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u72b6\u6cc1\u3092\u8868\u793a\n        printMemoryStats();\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-37\">\n<h4 class=\"wp-block-heading\" id=\"i-9\">\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-38\">\n<p><strong>1. \u9069\u5207\u306a\u30d2\u30fc\u30d7\u30b5\u30a4\u30ba\u306e\u8a2d\u5b9a<\/strong><\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   java -Xms1g -Xmx2g YourApplication<\/pre>\n\n\n<div id=\"sgb-css-id-39\">\n<p>\u3000\u25cf <code>-Xms<\/code>\uff1a \u521d\u671f\u30d2\u30fc\u30d7\u30b5\u30a4\u30ba<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-40\">\n<p>\u3000\u25cf <code>-Xmx<\/code>\uff1a \u6700\u5927\u30d2\u30fc\u30d7\u30b5\u30a4\u30ba<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-41\">\n<p><strong>2. GC\u30ed\u30b0\u306e\u6709\u52b9\u5316<\/strong><\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   java -XX:+UseG1GC -Xloggc:gc.log -XX:+PrintGCDetails YourApplication<\/pre>\n\n\n<div id=\"sgb-css-id-42\">\n<p><strong>3. \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u9632\u6b62\u306e\u57fa\u672c\u539f\u5247<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-43\">\n<p>\u3000\u25cf \u4e0d\u8981\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u53c2\u7167\u306e\u89e3\u653e<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-44\">\n<p>\u3000\u25cf try-with-resources\u306e\u4f7f\u7528<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-45\">\n<p>\u3000\u25cf \u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u9069\u5207\u306a\u7ba1\u7406<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-46\">\n<p>\u3053\u308c\u3089\u306e\u57fa\u790e\u77e5\u8b58\u306f\u3001\u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u7ba1\u7406\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u306e\u57fa\u76e4\u3068\u306a\u308a\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u77e5\u8b58\u3092\u6d3b\u7528\u3057\u305f\u5b9f\u8df5\u7684\u306a\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u5bfe\u7b56\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-47\">\n<h2 class=\"wp-block-heading\" id=\"i-10\">\uff12\uff0e\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u539f\u56e0\u3068\u5bfe\u7b56\u65b9\u6cd5<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-48\">\n<h3 class=\"wp-block-heading\" id=\"i-11\">2.1 \u3088\u304f\u3042\u308b\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u30d1\u30bf\u30fc\u30f35\u9078<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-49\">\n<h4 class=\"wp-block-heading\" id=\"i-12\">1. \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u4e0d\u9069\u5207\u306a\u4f7f\u7528<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class CacheManager {\n    \/\/ \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\n    private static final Map&lt;String, Object&gt; cache = new HashMap&lt;&gt;();\n\n    public void addToCache(String key, Object value) {\n        cache.put(key, value);  \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u80a5\u5927\u5316\u3092\u5236\u5fa1\u3057\u3066\u3044\u306a\u3044\n    }\n\n    \/\/ \u6539\u5584\u5f8c\u306e\u30b3\u30fc\u30c9\n    private static final Map&lt;String, Object&gt; improvedCache = \n        Collections.synchronizedMap(new LinkedHashMap&lt;String, Object&gt;(10000, 0.75f, true) {\n            @Override\n            protected boolean removeEldestEntry(Map.Entry&lt;String, Object&gt; eldest) {\n                return size() &gt; 10000;  \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30a4\u30ba\u3092\u5236\u9650\n            }\n        });\n}<\/pre>\n\n\n<div id=\"sgb-css-id-50\">\n<h4 class=\"wp-block-heading\" id=\"i-13\">2. \u30af\u30ed\u30fc\u30ba\u5fd8\u308c\u306e\u30ea\u30bd\u30fc\u30b9<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\npublic void readFile(String path) throws IOException {\n    FileInputStream fis = new FileInputStream(path);\n    \/\/ \u30ea\u30bd\u30fc\u30b9\u304c\u30af\u30ed\u30fc\u30ba\u3055\u308c\u3066\u3044\u306a\u3044\n}\n\n\/\/ \u6539\u5584\u5f8c\u306e\u30b3\u30fc\u30c9\npublic void readFileImproved(String path) throws IOException {\n    try (FileInputStream fis = new FileInputStream(path)) {\n        \/\/ try-with-resources\u3067\u30ea\u30bd\u30fc\u30b9\u306e\u81ea\u52d5\u30af\u30ed\u30fc\u30ba\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-51\">\n<h4 class=\"wp-block-heading\" id=\"i-14\">3. \u5185\u90e8\u30af\u30e9\u30b9\u306b\u3088\u308b\u53c2\u7167\u4fdd\u6301<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class OuterClass {\n    private byte[] largeArray = new byte[100000];\n\n    \/\/ \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\uff1a\u533f\u540d\u5185\u90e8\u30af\u30e9\u30b9\u304c\u5916\u90e8\u30af\u30e9\u30b9\u3078\u306e\u53c2\u7167\u3092\u4fdd\u6301\n    Runnable leakyRunnable = new Runnable() {\n        @Override\n        public void run() {\n            System.out.println(largeArray.length);\n        }\n    };\n\n    \/\/ \u6539\u5584\u5f8c\u306e\u30b3\u30fc\u30c9\uff1astatic\u5185\u90e8\u30af\u30e9\u30b9\u3092\u4f7f\u7528\n    private static class NonLeakyRunnable implements Runnable {\n        private final int arrayLength;\n\n        public NonLeakyRunnable(int length) {\n            this.arrayLength = length;\n        }\n\n        @Override\n        public void run() {\n            System.out.println(arrayLength);\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-52\">\n<h3 class=\"wp-block-heading\" id=\"i-15\">2.2 \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u767a\u898b\u306e\u305f\u3081\u306e\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u624b\u6cd5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-53\">\n<h4 class=\"wp-block-heading\" id=\"i-16\">1. JVM\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u30c4\u30fc\u30eb\u306e\u6d3b\u7528<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class MemoryLeakDetector {\n    public static void monitorMemory() {\n        MemoryMXBean memoryBean = ManagementFactory.getMemoryMXBean();\n        MemoryUsage heapUsage = memoryBean.getHeapMemoryUsage();\n\n        System.out.println(\"=== \u30d2\u30fc\u30d7\u30e1\u30e2\u30ea\u4f7f\u7528\u72b6\u6cc1 ===\");\n        System.out.printf(\"\u521d\u671f\u30b5\u30a4\u30ba: %d MB%n\", heapUsage.getInit() \/ 1024 \/ 1024);\n        System.out.printf(\"\u4f7f\u7528\u4e2d: %d MB%n\", heapUsage.getUsed() \/ 1024 \/ 1024);\n        System.out.printf(\"\u6700\u5927: %d MB%n\", heapUsage.getMax() \/ 1024 \/ 1024);\n        System.out.printf(\"\u30b3\u30df\u30c3\u30c8\u6e08\u307f: %d MB%n\", heapUsage.getCommitted() \/ 1024 \/ 1024);\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-54\">\n<h4 class=\"wp-block-heading\" id=\"i-17\">2. \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u691c\u51fa\u306e\u305f\u3081\u306e\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class LeakDetectionUtil {\n    private static final WeakHashMap&lt;Object, String&gt; objects = new WeakHashMap&lt;&gt;();\n    private static final ReferenceQueue&lt;Object&gt; queue = new ReferenceQueue&lt;&gt;();\n\n    public static void trackObject(Object obj) {\n        objects.put(obj, obj.getClass().getName());\n        System.out.printf(\"Tracking object of type: %s%n\", obj.getClass().getName());\n    }\n\n    public static void checkForLeaks() {\n        System.gc();  \/\/ GC\u3092\u5f37\u5236\u5b9f\u884c\n        objects.forEach((obj, className) -&gt; \n            System.out.printf(\"Potential leak detected: %s%n\", className));\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-55\">\n<h3 class=\"wp-block-heading\" id=\"i-18\">2.3 \u5b9f\u8df5\u7684\u306a\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u5bfe\u7b56\u306e\u5b9f\u88c5\u4f8b<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-56\">\n<h4 class=\"wp-block-heading\" id=\"i-19\">1. \u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u9069\u5207\u306a\u5b9f\u88c5<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class SmartCache&lt;K, V&gt; {\n    private final int maxEntries;\n    private final Map&lt;K, SoftReference&lt;V&gt;&gt; cache;\n\n    public SmartCache(int maxEntries) {\n        this.maxEntries = maxEntries;\n        this.cache = new LinkedHashMap&lt;K, SoftReference&lt;V&gt;&gt;(maxEntries + 1, .75F, true) {\n            @Override\n            protected boolean removeEldestEntry(Map.Entry&lt;K, SoftReference&lt;V&gt;&gt; eldest) {\n                return size() &gt; maxEntries;\n            }\n        };\n    }\n\n    public V get(K key) {\n        SoftReference&lt;V&gt; ref = cache.get(key);\n        return ref != null ? ref.get() : null;\n    }\n\n    public void put(K key, V value) {\n        cache.put(key, new SoftReference&lt;&gt;(value));\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-57\">\n<h4 class=\"wp-block-heading\" id=\"i-20\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u9632\u6b62\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-58\">\n<p><strong>1. \u9759\u7684\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u4f7f\u7528\u3092\u6700\u5c0f\u9650\u306b<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-59\">\n<p>\u3000\u25cf \u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u3084\u30d7\u30fc\u30eb\u306f\u8981\u6ce8\u610f<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-60\">\n<p>\u3000\u25cf \u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30b5\u30a4\u30ba\u5236\u9650\u3092\u5b9f\u88c5<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-61\">\n<p><strong>2. \u30ea\u30bd\u30fc\u30b9\u306e\u78ba\u5b9f\u306a\u89e3\u653e<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-62\">\n<p>\u3000\u25cf try-with-resources\u306e\u7a4d\u6975\u7684\u306a\u4f7f\u7528<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-63\">\n<p>\u3000\u25cf finally\u30d6\u30ed\u30c3\u30af\u3067\u306e\u30af\u30ed\u30fc\u30ba\u51e6\u7406<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-64\">\n<p><strong>3. \u53c2\u7167\u306e\u9069\u5207\u306a\u7ba1\u7406<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-65\">\n<p>\u3000\u25cf WeakReference\u3084SoftReference\u306e\u6d3b\u7528<\/p>\n<\/div>\n\n\n<p>\u3000\u25cf \u4e0d\u8981\u306a\u53c2\u7167\u306e\u660e\u793a\u7684\u306a\u89e3\u653e<\/p>\n\n\n<div id=\"sgb-css-id-66\">\n<p>\u3053\u308c\u3089\u306e\u5bfe\u7b56\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001\u591a\u304f\u306e\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u5b9f\u969b\u306bOutOfMemoryError\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306e\u5bfe\u51e6\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-67\">\n<h2 class=\"wp-block-heading\" id=\"i-21\">\uff13\uff0eOutOfMemoryError\u3078\u306e\u5bfe\u51e6\u6cd5<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-68\">\n<h3 class=\"wp-block-heading\" id=\"i-22\">3.1 \u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304b\u3089\u539f\u56e0\u3092\u7279\u5b9a\u3059\u308b\u65b9\u6cd5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-69\">\n<h4 class=\"wp-block-heading\" id=\"i-23\">\u4e3b\u306aOutOfMemoryError\u306e\u7a2e\u985e\u3068\u539f\u56e0<\/h4>\n<\/div>\n\n<div id=\"id-5befb034-9153-492e-85ed-44916a0e118a\"><div id=\"sgb-css-id-70\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8<\/th><th>\u767a\u751f\u539f\u56e0<\/th><th>\u5bfe\u51e6\u65b9\u6cd5<\/th><\/tr><\/thead><tbody><tr><td><code>java.lang.OutOfMemoryError: Java heap space<\/code><\/td><td>\u30d2\u30fc\u30d7\u9818\u57df\u306e\u67af\u6e07<\/td><td>\u30d2\u30fc\u30d7\u30b5\u30a4\u30ba\u306e\u8abf\u6574\u3001\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u7279\u5b9a<\/td><\/tr><tr><td><code>java.lang.OutOfMemoryError: GC overhead limit exceeded<\/code><\/td><td>GC\u306b\u904e\u5ea6\u306a\u6642\u9593\u3092\u8cbb\u3084\u3057\u3066\u3044\u308b<\/td><td>\u30d2\u30fc\u30d7\u30b5\u30a4\u30ba\u306e\u5897\u52a0\u3001GC\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u5909\u66f4<\/td><\/tr><tr><td><code>java.lang.OutOfMemoryError: PermGen space<\/code><\/td><td>Java 7\u4ee5\u524d\u3067\u306ePermGen\u9818\u57df\u306e\u67af\u6e07<\/td><td><code>-XX:MaxPermSize<\/code>\u306e\u8abf\u6574<\/td><\/tr><tr><td><code>java.lang.OutOfMemoryError: Metaspace<\/code><\/td><td>Java 8\u4ee5\u964d\u3067\u306eMetaspace\u9818\u57df\u306e\u67af\u6e07<\/td><td><code>-XX:MaxMetaspaceSize<\/code>\u306e\u8abf\u6574<\/td><\/tr><tr><td><code>java.lang.OutOfMemoryError: Unable to create new native thread<\/code><\/td><td>\u30b9\u30ec\u30c3\u30c9\u6570\u306e\u4e0a\u9650\u5230\u9054<\/td><td>\u30b9\u30ec\u30c3\u30c9\u30b9\u30bf\u30c3\u30af\u30b5\u30a4\u30ba\u306e\u8abf\u6574\u3001\u30b9\u30ec\u30c3\u30c9\u6570\u306e\u5236\u9650<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n\n<div id=\"sgb-css-id-71\">\n<h4 class=\"wp-block-heading\" id=\"i-24\">\u30a8\u30e9\u30fc\u691c\u51fa\u7528\u306e\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class OOMEDetector {\n    public static void enableOOMEDetection() {\n        Thread.setDefaultUncaughtExceptionHandler((thread, throwable) -&gt; {\n            if (throwable instanceof OutOfMemoryError) {\n                System.err.println(\"=== OutOfMemoryError\u691c\u51fa ===\");\n                System.err.println(\"\u30b9\u30ec\u30c3\u30c9: \" + thread.getName());\n                System.err.println(\"\u30a8\u30e9\u30fc: \" + throwable.getMessage());\n\n                \/\/ \u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\u306e\u81ea\u52d5\u53d6\u5f97\n                try {\n                    String filename = \"heap-dump-\" + System.currentTimeMillis() + \".hprof\";\n                    ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean.class)\n                        .dumpHeap(filename, true);\n                    System.err.println(\"\u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\u751f\u6210: \" + filename);\n                } catch (Exception e) {\n                    e.err.println(\"\u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\u751f\u6210\u5931\u6557: \" + e.getMessage());\n                }\n            }\n        });\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-72\">\n<h3 class=\"wp-block-heading\" id=\"i-25\">3.2 \u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\u306e\u53d6\u5f97\u3068\u89e3\u6790\u624b\u9806<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-73\">\n<h4 class=\"wp-block-heading\" id=\"i-26\">1. \u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\u306e\u53d6\u5f97\u65b9\u6cd5<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u5b9f\u884c\u4e2d\u306eJava\u30d7\u30ed\u30bb\u30b9\u306e\u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\u3092\u53d6\u5f97\njmap -dump:format=b,file=heap.hprof &lt;pid&gt;\n\n# \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u8d77\u52d5\u6642\u306bOOME\u767a\u751f\u6642\u306e\u81ea\u52d5\u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\u3092\u6709\u52b9\u5316\njava -XX:+HeapDumpOnOutOfMemoryError \\\n     -XX:HeapDumpPath=\/path\/to\/dumps \\\n     YourApplication<\/pre>\n\n\n<div id=\"sgb-css-id-74\">\n<h4 class=\"wp-block-heading\" id=\"i-27\">2. jhat\u306b\u3088\u308b\u57fa\u672c\u7684\u306a\u89e3\u6790<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\u306e\u89e3\u6790\u30b5\u30fc\u30d0\u30fc\u3092\u8d77\u52d5\njhat -J-Xmx4g heap.hprof\n# \u30d6\u30e9\u30a6\u30b6\u3067 http:\/\/localhost:7000 \u306b\u30a2\u30af\u30bb\u30b9<\/pre>\n\n\n<div id=\"sgb-css-id-75\">\n<h4 class=\"wp-block-heading\" id=\"i-28\">3. Eclipse Memory Analyzer\u3067\u306e\u8a73\u7d30\u89e3\u6790\u624b\u9806<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-76\">\n<p>\u30001. Leak\u306e\u30b5\u30b9\u30da\u30af\u30c8\u3092\u7279\u5b9a<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-77\">\n<p>\u30002. GC\u30eb\u30fc\u30c8\u304b\u3089\u306e\u53c2\u7167\u30d1\u30b9\u3092\u78ba\u8a8d<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-78\">\n<p>\u30003. \u30e1\u30e2\u30ea\u306e\u5927\u91cf\u6d88\u8cbb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u7279\u5b9a<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-79\">\n<p>\u30004. \u30c9\u30df\u30cd\u30fc\u30bf\u30fc\u30c4\u30ea\u30fc\u3067\u30e1\u30e2\u30ea\u4f7f\u7528\u72b6\u6cc1\u3092\u78ba\u8a8d<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-80\">\n<h3 class=\"wp-block-heading\" id=\"i-29\">3.3 \u30e1\u30e2\u30ea\u8a2d\u5b9a\u306e\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u30dd\u30a4\u30f3\u30c8<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-81\">\n<h4 class=\"wp-block-heading\" id=\"i-30\">\u57fa\u672c\u7684\u306aJVM\u30aa\u30d7\u30b7\u30e7\u30f3\u8a2d\u5b9a<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">java \\\n  -Xms2g \\                          # \u521d\u671f\u30d2\u30fc\u30d7\u30b5\u30a4\u30ba\n  -Xmx4g \\                          # \u6700\u5927\u30d2\u30fc\u30d7\u30b5\u30a4\u30ba\n  -XX:NewRatio=2 \\                  # New:Old\u4e16\u4ee3\u306e\u6bd4\u7387\n  -XX:SurvivorRatio=8 \\            # Eden:Survivor\u9818\u57df\u306e\u6bd4\u7387\n  -XX:+UseG1GC \\                   # G1GC\u306e\u4f7f\u7528\n  -XX:MaxGCPauseMillis=200 \\       # GC\u6700\u5927\u505c\u6b62\u6642\u9593\n  -XX:+HeapDumpOnOutOfMemoryError \\ # OOME\u6642\u306e\u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\n  YourApplication<\/pre>\n\n\n<div id=\"sgb-css-id-82\">\n<h4 class=\"wp-block-heading\" id=\"i-31\">\u30e1\u30e2\u30ea\u8a2d\u5b9a\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-83\">\n<p>\u3000<strong>1. \u30d2\u30fc\u30d7\u30b5\u30a4\u30ba\u306e\u9069\u5207\u306a\u8a2d\u5b9a<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-84\">\n<p>\u3000\u3000\u25cf \u7269\u7406\u30e1\u30e2\u30ea\u306e50-70%\u3092\u76ee\u5b89\u306b\u8a2d\u5b9a<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-85\">\n<p>\u3000\u3000\u25cf <code>-Xms<\/code>\u3068<code>-Xmx<\/code>\u306f\u540c\u3058\u5024\u306b\u8a2d\u5b9a\u3092\u63a8\u5968<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-86\">\n<p>\u3000<strong>2. GC\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-87\">\n<p>\u3000\u3000\u25cf \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u7279\u6027\u306b\u5fdc\u3058\u305fGC\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u9078\u629e<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-88\">\n<p>\u3000\u3000\u25cf GC\u30ed\u30b0\u306e\u6709\u52b9\u5316\u3068\u5b9a\u671f\u7684\u306a\u5206\u6790<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-89\">\n<p>\u3000<strong>3. \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u5bfe\u7b56<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-90\">\n<p>\u3000\u3000\u25cf \u5b9a\u671f\u7684\u306a\u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\u306e\u5206\u6790<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-91\">\n<p>\u3000\u3000\u25cf \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u76e3\u8996\u4f53\u5236\u306e\u69cb\u7bc9<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u76e3\u8996\u306e\u5b9f\u88c5\u4f8b\npublic class MemoryMonitor implements Runnable {\n    private final long thresholdBytes;\n    private final long checkIntervalMs;\n\n    public MemoryMonitor(long thresholdMB, long checkIntervalSeconds) {\n        this.thresholdBytes = thresholdMB * 1024 * 1024;\n        this.checkIntervalMs = checkIntervalSeconds * 1000;\n    }\n\n    @Override\n    public void run() {\n        while (!Thread.currentThread().isInterrupted()) {\n            Runtime runtime = Runtime.getRuntime();\n            long usedMemory = runtime.totalMemory() - runtime.freeMemory();\n\n            if (usedMemory &gt; thresholdBytes) {\n                System.err.println(\"\u8b66\u544a: \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u304c\u95be\u5024\u3092\u8d85\u3048\u307e\u3057\u305f\");\n                System.err.printf(\"\u73fe\u5728\u306e\u4f7f\u7528\u91cf: %d MB%n\", usedMemory \/ 1024 \/ 1024);\n            }\n\n            try {\n                Thread.sleep(checkIntervalMs);\n            } catch (InterruptedException e) {\n                Thread.currentThread().interrupt();\n                break;\n            }\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-92\">\n<p>\u3053\u308c\u3089\u306e\u5bfe\u7b56\u3092\u9069\u5207\u306b\u5b9f\u65bd\u3059\u308b\u3053\u3068\u3067\u3001OutOfMemoryError\u306e\u767a\u751f\u3092\u9632\u304e\u3001\u767a\u751f\u6642\u3082\u8fc5\u901f\u306b\u5bfe\u5fdc\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305f\u30e1\u30e2\u30ea\u7ba1\u7406\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-93\">\n<h2 class=\"wp-block-heading\" id=\"i-32\">\uff14\uff0e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305f\u30e1\u30e2\u30ea\u7ba1\u7406<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-94\">\n<h3 class=\"wp-block-heading\" id=\"i-33\">4.1 \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u624b\u6cd5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-95\">\n<h4 class=\"wp-block-heading\" id=\"i-34\">1. \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u518d\u5229\u7528<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class StringBuilderPool {\n    private static final ThreadLocal&lt;StringBuilder&gt; builderPool = \n        ThreadLocal.withInitial(() -&gt; new StringBuilder(256));\n\n    public static String buildString(String... parts) {\n        StringBuilder builder = builderPool.get();\n        builder.setLength(0);  \/\/ \u518d\u5229\u7528\u524d\u306b\u30af\u30ea\u30a2\n\n        for (String part : parts) {\n            builder.append(part);\n        }\n\n        return builder.toString();\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-96\">\n<h4 class=\"wp-block-heading\" id=\"i-35\">2. \u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u6d3b\u7528<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30e1\u30e2\u30ea\u975e\u52b9\u7387\u306a\u5b9f\u88c5\nList&lt;Integer&gt; numbers = new ArrayList&lt;&gt;();  \/\/ \u30dc\u30af\u30b7\u30f3\u30b0\u304c\u767a\u751f\n\n\/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u5b9f\u88c5\npublic class IntArrayList {\n    private int[] elements;\n    private int size;\n\n    public IntArrayList(int initialCapacity) {\n        elements = new int[initialCapacity];\n    }\n\n    public void add(int e) {\n        if (size == elements.length) {\n            int[] newElements = new int[elements.length * 2];\n            System.arraycopy(elements, 0, newElements, 0, size);\n            elements = newElements;\n        }\n        elements[size++] = e;\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-97\">\n<h4 class=\"wp-block-heading\" id=\"i-36\">3. \u30d0\u30c3\u30d5\u30a1\u30ea\u30f3\u30b0\u306e\u6d3b\u7528<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class BufferedProcessor {\n    private static final int BUFFER_SIZE = 1000;\n    private final List&lt;String&gt; buffer;\n\n    public BufferedProcessor() {\n        this.buffer = new ArrayList&lt;&gt;(BUFFER_SIZE);\n    }\n\n    public void process(String item) {\n        buffer.add(item);\n\n        if (buffer.size() &gt;= BUFFER_SIZE) {\n            flushBuffer();\n        }\n    }\n\n    private void flushBuffer() {\n        \/\/ \u30d0\u30c3\u30d5\u30a1\u306e\u4e00\u62ec\u51e6\u7406\n        buffer.clear();\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-98\">\n<h3 class=\"wp-block-heading\" id=\"i-37\">4.2 \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30af\u30e9\u30b9\u306e\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-99\">\n<h4 class=\"wp-block-heading\" id=\"i-38\">\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u9078\u629e\u306e\u30c7\u30b7\u30b8\u30e7\u30f3\u30c4\u30ea\u30fc<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">graph TD\n    A[\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u9078\u629e] --&gt; B{\u30e6\u30cb\u30fc\u30af\u306a\u8981\u7d20\u304c\u5fc5\u8981?}\n    B --&gt;|Yes| C[Set\u7cfb]\n    B --&gt;|No| D[List\u7cfb]\n    C --&gt; E{\u9806\u5e8f\u304c\u91cd\u8981?}\n    E --&gt;|Yes| F[LinkedHashSet]\n    E --&gt;|No| G[HashSet]\n    D --&gt; H{\u30e9\u30f3\u30c0\u30e0\u30a2\u30af\u30bb\u30b9\u304c\u5fc5\u8981?}\n    H --&gt;|Yes| I[ArrayList]\n    H --&gt;|No| J[LinkedList]<\/pre>\n\n\n<div id=\"sgb-css-id-100\">\n<h4 class=\"wp-block-heading\" id=\"i-39\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6bd4\u8f03\u8868<\/h4>\n<\/div>\n\n<div id=\"id-80be0285-901f-475d-a071-9621ae4ab9d3\"><div id=\"sgb-css-id-101\">\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u30b3\u30ec\u30af\u30b7\u30e7\u30f3<\/th><th>\u8ffd\u52a0<\/th><th>\u691c\u7d22<\/th><th>\u524a\u9664<\/th><th>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf<\/th><\/tr><\/thead><tbody><tr><td><code>ArrayList<\/code><\/td><td>O(1)<\/td><td>O(1)<\/td><td>O(n)<\/td><td>\u4f4e<\/td><\/tr><tr><td><code>LinkedList<\/code><\/td><td>O(1)<\/td><td>O(n)<\/td><td>O(1)<\/td><td>\u4e2d<\/td><\/tr><tr><td><code>HashSet<\/code><\/td><td>O(1)<\/td><td>O(1)<\/td><td>O(1)<\/td><td>\u4e2d<\/td><\/tr><tr><td><code>TreeSet<\/code><\/td><td>O(log n)<\/td><td>O(log n)<\/td><td>O(log n)<\/td><td>\u4e2d<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n\n<div id=\"sgb-css-id-102\">\n<h3 class=\"wp-block-heading\" id=\"i-40\">4.3 \u30ad\u30e3\u30c3\u30b7\u30e5\u6226\u7565\u306e\u8a2d\u8a08\u3068\u5b9f\u88c5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-103\">\n<h4 class=\"wp-block-heading\" id=\"i-41\">1. LRU\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u5b9f\u88c5<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class LRUCache&lt;K, V&gt; extends LinkedHashMap&lt;K, V&gt; {\n    private final int capacity;\n\n    public LRUCache(int capacity) {\n        super(capacity + 1, 1.0f, true);\n        this.capacity = capacity;\n    }\n\n    @Override\n    protected boolean removeEldestEntry(Map.Entry&lt;K, V&gt; eldest) {\n        return size() &gt; capacity;\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-104\">\n<h4 class=\"wp-block-heading\" id=\"i-42\">2. \u4e8c\u5c64\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u5b9f\u88c5<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class TwoLevelCache&lt;K, V&gt; {\n    private final Map&lt;K, V&gt; l1Cache;  \/\/ \u30e1\u30e2\u30ea\u4e0a\u306e\u9ad8\u901f\u30ad\u30e3\u30c3\u30b7\u30e5\n    private final Map&lt;K, V&gt; l2Cache;  \/\/ \u30c7\u30a3\u30b9\u30af\u4e0a\u306e\u6c38\u7d9a\u30ad\u30e3\u30c3\u30b7\u30e5\n    private final int l1Capacity;\n\n    public TwoLevelCache(int l1Capacity) {\n        this.l1Capacity = l1Capacity;\n        this.l1Cache = new LinkedHashMap&lt;&gt;(l1Capacity, 0.75f, true) {\n            @Override\n            protected boolean removeEldestEntry(Map.Entry&lt;K, V&gt; eldest) {\n                if (size() &gt; l1Capacity) {\n                    l2Cache.put(eldest.getKey(), eldest.getValue());\n                    return true;\n                }\n                return false;\n            }\n        };\n        this.l2Cache = new ConcurrentHashMap&lt;&gt;();\n    }\n\n    public V get(K key) {\n        V value = l1Cache.get(key);\n        if (value == null) {\n            value = l2Cache.get(key);\n            if (value != null) {\n                l1Cache.put(key, value);  \/\/ L1\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u6607\u683c\n            }\n        }\n        return value;\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-105\">\n<h4 class=\"wp-block-heading\" id=\"i-43\">3. \u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u76e3\u8996<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class CacheMetrics {\n    private final AtomicLong hits = new AtomicLong();\n    private final AtomicLong misses = new AtomicLong();\n    private final AtomicLong totalRequests = new AtomicLong();\n\n    public void recordHit() {\n        hits.incrementAndGet();\n        totalRequests.incrementAndGet();\n    }\n\n    public void recordMiss() {\n        misses.incrementAndGet();\n        totalRequests.incrementAndGet();\n    }\n\n    public double getHitRate() {\n        long total = totalRequests.get();\n        return total == 0 ? 0.0 : (double) hits.get() \/ total;\n    }\n\n    public void printStats() {\n        System.out.printf(\"Cache Hit Rate: %.2f%%%n\", getHitRate() * 100);\n        System.out.printf(\"Total Requests: %d%n\", totalRequests.get());\n        System.out.printf(\"Hits: %d%n\", hits.get());\n        System.out.printf(\"Misses: %d%n\", misses.get());\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-106\">\n<h3 class=\"wp-block-heading\" id=\"i-44\">4.4 \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-107\">\n<p><strong>1. \u521d\u671f\u5bb9\u91cf\u306e\u9069\u5207\u306a\u8a2d\u5b9a<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-108\">\n<p>\u3000\u25cf \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u521d\u671f\u30b5\u30a4\u30ba\u3092\u9069\u5207\u306b\u898b\u7a4d\u3082\u308b<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-109\">\n<p>\u3000\u25cf \u983b\u7e41\u306a\u30ea\u30b5\u30a4\u30ba\u3092\u56de\u907f<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-110\">\n<p><strong>2. \u4e0d\u8981\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u306e\u56de\u907f<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-111\">\n<p>\u3000\u25cf \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30d7\u30fc\u30eb\u306e\u6d3b\u7528<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-112\">\n<p>\u3000\u25cf StringBuilder\u306e\u518d\u5229\u7528<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-113\">\n<p><strong>3. \u4e26\u884c\u51e6\u7406\u306e\u6700\u9069\u5316<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-114\">\n<p>\u3000\u25cf \u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u9069\u5207\u306a\u4f7f\u7528<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-115\">\n<p>\u3000\u25cf \u30ed\u30c3\u30af\u7bc4\u56f2\u306e\u6700\u5c0f\u5316<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-116\">\n<p><strong>4. \u30e1\u30e2\u30ea\u30a2\u30af\u30bb\u30b9\u30d1\u30bf\u30fc\u30f3\u306e\u6700\u9069\u5316<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-117\">\n<p>\u3000\u25cf \u30c7\u30fc\u30bf\u306e\u30ed\u30fc\u30ab\u30ea\u30c6\u30a3\u3092\u8003\u616e<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-118\">\n<p>\u3000\u25cf \u30ad\u30e3\u30c3\u30b7\u30e5\u30d5\u30ec\u30f3\u30c9\u30ea\u30fc\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u9078\u629e<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-119\">\n<p>\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u30e1\u30e2\u30ea\u52b9\u7387\u304c\u9ad8\u304f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u826f\u3044\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3055\u3089\u306b\u5b9f\u8df5\u7684\u306a\u30e1\u30e2\u30ea\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-120\">\n<h2 class=\"wp-block-heading\" id=\"i-45\">\uff15\uff0e\u5b9f\u8df5\u7684\u306a\u30e1\u30e2\u30ea\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-121\">\n<p>\u73fe\u4ee3\u306e\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u3001\u5927\u91cf\u30c7\u30fc\u30bf\u51e6\u7406\u3001\u30de\u30a4\u30af\u30ed\u30b5\u30fc\u30d3\u30b9\u3001\u30af\u30e9\u30a6\u30c9\u74b0\u5883\u306a\u3069\u3001\u69d8\u3005\u306a\u8981\u7d20\u3092\u8003\u616e\u3057\u305f\u30e1\u30e2\u30ea\u6700\u9069\u5316\u304c\u5fc5\u8981\u3067\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u5b9f\u8df5\u7684\u306a\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-122\">\n<h3 class=\"wp-block-heading\" id=\"i-46\">5.1 \u5927\u91cf\u30c7\u30fc\u30bf\u51e6\u7406\u6642\u306e\u30e1\u30e2\u30ea\u7ba1\u7406\u8853<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-123\">\n<h4 class=\"wp-block-heading\" id=\"i-47\">1. \u30b9\u30c8\u30ea\u30fc\u30e0\u51e6\u7406\u306b\u3088\u308b\u6700\u9069\u5316<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class StreamProcessingExample {\n    \/\/ \u975e\u52b9\u7387\u306a\u5b9f\u88c5\uff08\u5168\u30c7\u30fc\u30bf\u3092\u30e1\u30e2\u30ea\u306b\u4fdd\u6301\uff09\n    public List&lt;Customer&gt; processCustomersInefficient(String filename) \n            throws IOException {\n        List&lt;Customer&gt; customers = Files.readAllLines(Paths.get(filename))\n            .stream()\n            .map(this::parseCustomer)\n            .filter(customer -&gt; customer.getScore() &gt; 500)\n            .collect(Collectors.toList());\n        return customers;\n    }\n\n    \/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u5b9f\u88c5\uff08\u30b9\u30c8\u30ea\u30fc\u30e0\u51e6\u7406\uff09\n    public void processCustomersEfficient(String filename, \n            Consumer&lt;Customer&gt; processor) throws IOException {\n        try (BufferedReader reader = Files.newBufferedReader(Paths.get(filename))) {\n            reader.lines()\n                .map(this::parseCustomer)\n                .filter(customer -&gt; customer.getScore() &gt; 500)\n                .forEach(processor);\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-124\">\n<h4 class=\"wp-block-heading\" id=\"i-48\">2. \u30d0\u30c3\u30c1\u51e6\u7406\u306e\u6700\u9069\u5316<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class BatchProcessingOptimization {\n    private static final int BATCH_SIZE = 1000;\n\n    public void processBatch(List&lt;String&gt; items) {\n        List&lt;List&lt;String&gt;&gt; batches = Lists.partition(items, BATCH_SIZE);\n\n        batches.forEach(batch -&gt; {\n            try {\n                processBatchWithRetry(batch);\n            } catch (Exception e) {\n                logError(batch, e);\n            }\n        });\n    }\n\n    \/\/ \u30d0\u30c3\u30c1\u51e6\u7406with\u518d\u8a66\u884c\u30ed\u30b8\u30c3\u30af\n    private void processBatchWithRetry(List&lt;String&gt; batch) {\n        int maxRetries = 3;\n        int attempt = 0;\n\n        while (attempt &lt; maxRetries) {\n            try {\n                processItems(batch);\n                return;\n            } catch (Exception e) {\n                attempt++;\n                if (attempt == maxRetries) {\n                    throw e;\n                }\n                waitBeforeRetry(attempt);\n            }\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-125\">\n<h3 class=\"wp-block-heading\" id=\"i-49\">5.2 \u30de\u30a4\u30af\u30ed\u30b5\u30fc\u30d3\u30b9\u306b\u304a\u3051\u308b\u30e1\u30e2\u30ea\u8a2d\u8a08<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-126\">\n<h4 class=\"wp-block-heading\" id=\"i-50\">1. \u30b5\u30fc\u30d3\u30b9\u5206\u5272\u3068\u30e1\u30e2\u30ea\u914d\u5206<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@Configuration\npublic class MemoryConfiguration {\n    @Bean\n    public CacheManager cacheManager() {\n        \/\/ \u30b5\u30fc\u30d3\u30b9\u3054\u3068\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30a4\u30ba\u3092\u6700\u9069\u5316\n        CaffeineCacheManager cacheManager = new CaffeineCacheManager();\n        cacheManager.setCaffeine(Caffeine.newBuilder()\n            .maximumSize(10_000)\n            .expireAfterWrite(1, TimeUnit.HOURS)\n            .recordStats());\n        return cacheManager;\n    }\n\n    @Bean\n    public ThreadPoolTaskExecutor asyncExecutor() {\n        \/\/ \u30b9\u30ec\u30c3\u30c9\u30d7\u30fc\u30eb\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u5236\u5fa1\n        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();\n        executor.setCorePoolSize(5);\n        executor.setMaxPoolSize(10);\n        executor.setQueueCapacity(25);\n        return executor;\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-127\">\n<h4 class=\"wp-block-heading\" id=\"i-51\">2. Circuit Breaker \u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class MemoryAwareCircuitBreaker {\n    private final AtomicInteger failureCount = new AtomicInteger(0);\n    private final AtomicBoolean isOpen = new AtomicBoolean(false);\n    private final int threshold;\n    private final Runtime runtime;\n\n    public MemoryAwareCircuitBreaker(int threshold) {\n        this.threshold = threshold;\n        this.runtime = Runtime.getRuntime();\n    }\n\n    public &lt;T&gt; T execute(Supplier&lt;T&gt; operation) {\n        if (isOpen.get()) {\n            throw new CircuitBreakerOpenException(\"Circuit breaker is open\");\n        }\n\n        if (isMemoryPressure()) {\n            isOpen.set(true);\n            throw new MemoryPressureException(\"High memory pressure detected\");\n        }\n\n        try {\n            T result = operation.get();\n            failureCount.set(0);\n            return result;\n        } catch (Exception e) {\n            handleFailure();\n            throw e;\n        }\n    }\n\n    private boolean isMemoryPressure() {\n        long maxMemory = runtime.maxMemory();\n        long usedMemory = runtime.totalMemory() - runtime.freeMemory();\n        return (usedMemory * 100) \/ maxMemory &gt; 90;\n    }\n\n    private void handleFailure() {\n        if (failureCount.incrementAndGet() &gt;= threshold) {\n            isOpen.set(true);\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-128\">\n<h3 class=\"wp-block-heading\" id=\"i-52\">5.3 \u30af\u30e9\u30a6\u30c9\u74b0\u5883\u3067\u306e\u30e1\u30e2\u30ea\u8a2d\u5b9a\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-129\">\n<h4 class=\"wp-block-heading\" id=\"i-53\">1. \u30b3\u30f3\u30c6\u30ca\u5316\u3055\u308c\u305f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30e1\u30e2\u30ea\u8a2d\u5b9a<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Kubernetes deployment example\napiVersion: apps\/v1\nkind: Deployment\nmetadata:\n  name: java-application\nspec:\n  template:\n    spec:\n      containers:\n      - name: java-app\n        image: your-java-app:latest\n        resources:\n          requests:\n            memory: \"512Mi\"\n            cpu: \"500m\"\n          limits:\n            memory: \"1Gi\"\n            cpu: \"1000m\"\n        env:\n        - name: JAVA_OPTS\n          value: &gt;-\n            -XX:+UseContainerSupport\n            -XX:MaxRAMPercentage=75.0\n            -XX:InitialRAMPercentage=50.0\n            -XX:+UseG1GC\n            -XX:+HeapDumpOnOutOfMemoryError\n            -XX:HeapDumpPath=\/dumps<\/pre>\n\n\n<div id=\"sgb-css-id-130\">\n<h4 class=\"wp-block-heading\" id=\"i-54\">2. \u81ea\u52d5\u30b9\u30b1\u30fc\u30ea\u30f3\u30b0\u3092\u8003\u616e\u3057\u305f\u30e1\u30e2\u30ea\u8a2d\u5b9a<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@Configuration\npublic class CloudMemoryConfig {\n    @Bean\n    public MetricsMonitor metricsMonitor() {\n        return new MetricsMonitor() {\n            private final MeterRegistry registry = new SimpleMeterRegistry();\n\n            @Scheduled(fixedRate = 60000)  \/\/ 1\u5206\u3054\u3068\u306b\u6e2c\u5b9a\n            public void recordMetrics() {\n                Runtime runtime = Runtime.getRuntime();\n                long usedMemory = runtime.totalMemory() - runtime.freeMemory();\n\n                \/\/ \u30e1\u30e2\u30ea\u4f7f\u7528\u7387\u3092\u30e1\u30c8\u30ea\u30af\u30b9\u3068\u3057\u3066\u8a18\u9332\n                registry.gauge(\"jvm.memory.used\", usedMemory);\n\n                \/\/ \u30d2\u30fc\u30d7\u4f7f\u7528\u7387\u304c80%\u3092\u8d85\u3048\u305f\u5834\u5408\u306b\u30a2\u30e9\u30fc\u30c8\n                if ((usedMemory * 100) \/ runtime.maxMemory() &gt; 80) {\n                    alertHighMemoryUsage(usedMemory);\n                }\n            }\n\n            private void alertHighMemoryUsage(long usedMemory) {\n                \/\/ \u30a2\u30e9\u30fc\u30c8\u51e6\u7406\uff08\u4f8b\uff1aPrometheus Alertmanager\u3078\u306e\u901a\u77e5\uff09\n            }\n        };\n    }\n\n    @Bean\n    public CacheConfiguration dynamicCacheConfig(\n            @Value(\"${CACHE_SIZE_PERCENTAGE:20}\") int cacheSizePercentage) {\n        Runtime runtime = Runtime.getRuntime();\n        long maxMemory = runtime.maxMemory();\n        long cacheSize = (maxMemory * cacheSizePercentage) \/ 100;\n\n        return CacheConfiguration.builder()\n            .maximumSize(cacheSize \/ 1024)  \/\/ \u30a8\u30f3\u30c8\u30ea\u6570\u306b\u5909\u63db\n            .build();\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-131\">\n<h4 class=\"wp-block-heading\" id=\"i-55\">3. \u30af\u30e9\u30a6\u30c9\u30cd\u30a4\u30c6\u30a3\u30d6\u306a\u30e1\u30e2\u30ea\u7ba1\u7406<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class CloudNativeMemoryManager {\n    private final MemoryMXBean memoryMXBean;\n    private final List&lt;GarbageCollectorMXBean&gt; gcBeans;\n\n    public CloudNativeMemoryManager() {\n        this.memoryMXBean = ManagementFactory.getMemoryMXBean();\n        this.gcBeans = ManagementFactory.getGarbageCollectorMXBeans();\n    }\n\n    public MemoryStats getMemoryStats() {\n        MemoryUsage heapUsage = memoryMXBean.getHeapMemoryUsage();\n        MemoryUsage nonHeapUsage = memoryMXBean.getNonHeapMemoryUsage();\n\n        return MemoryStats.builder()\n            .heapUsed(heapUsage.getUsed())\n            .heapMax(heapUsage.getMax())\n            .nonHeapUsed(nonHeapUsage.getUsed())\n            .gcStats(getGCStats())\n            .build();\n    }\n\n    private Map&lt;String, GCStats&gt; getGCStats() {\n        return gcBeans.stream()\n            .collect(Collectors.toMap(\n                GarbageCollectorMXBean::getName,\n                bean -&gt; new GCStats(\n                    bean.getCollectionCount(),\n                    bean.getCollectionTime()\n                )\n            ));\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-132\">\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u30af\u30e9\u30a6\u30c9\u30cd\u30a4\u30c6\u30a3\u30d6\u306a\u74b0\u5883\u3067\u3082\u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u7ba1\u7406\u304c\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-133\">\n<h2 class=\"wp-block-heading\" id=\"i-56\">\uff16\uff0e\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-134\">\n<p>\u30e1\u30e2\u30ea\u95a2\u9023\u306e\u554f\u984c\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5b89\u5b9a\u6027\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u76f4\u63a5\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u5b9f\u8df5\u7684\u306a\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u624b\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-135\">\n<h3 class=\"wp-block-heading\" id=\"i-57\">6.1 \u30e1\u30e2\u30ea\u95a2\u9023\u554f\u984c\u306e\u5207\u308a\u5206\u3051\u624b\u9806<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-136\">\n<h4 class=\"wp-block-heading\" id=\"i-58\">1. \u554f\u984c\u306e\u7279\u5b9a\u3068\u5206\u985e<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-137\">\n<p>\u30e1\u30e2\u30ea\u554f\u984c\u3092\u4ee5\u4e0b\u306e\u30ab\u30c6\u30b4\u30ea\u306b\u5206\u985e\u3057\u3066\u5bfe\u5fdc\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"id-73729fa4-de3e-4339-9aea-0862e7d302c9\"><div id=\"sgb-css-id-138\">\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u554f\u984c\u306e\u7a2e\u985e<\/th><th>\u75c7\u72b6<\/th><th>\u4e3b\u306a\u539f\u56e0<\/th><th>\u8abf\u67fb\u65b9\u6cd5<\/th><\/tr><\/thead><tbody><tr><td>\u30e1\u30e2\u30ea\u30ea\u30fc\u30af<\/td><td>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u304c\u5f90\u3005\u306b\u5897\u52a0<\/td><td>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u53c2\u7167\u306e\u89e3\u653e\u5fd8\u308c<\/td><td>\u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\u89e3\u6790<\/td><\/tr><tr><td>\u30e1\u30e2\u30ea\u67af\u6e07<\/td><td>\u7a81\u767a\u7684\u306aOOM\u30a8\u30e9\u30fc<\/td><td>\u5927\u91cf\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210<\/td><td>GC\u30ed\u30b0\u89e3\u6790<\/td><\/tr><tr><td>GC\u554f\u984c<\/td><td>\u983b\u7e41\u306aGC\u306b\u3088\u308b\u505c\u6b62<\/td><td>\u4e0d\u9069\u5207\u306aGC\u8a2d\u5b9a<\/td><td>GC\u30ed\u30b0\u89e3\u6790\u3001JFR<\/td><\/tr><tr><td>\u30e1\u30e2\u30ea\u30d5\u30e9\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3<\/td><td>\u65ad\u7247\u5316\u306b\u3088\u308bOOM<\/td><td>\u9577\u6642\u9593\u904b\u7528\u3067\u306e\u65ad\u7247\u5316<\/td><td>\u30d2\u30fc\u30d7\u4f7f\u7528\u7387\u5206\u6790<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n\n<div id=\"sgb-css-id-139\">\n<h4 class=\"wp-block-heading\" id=\"i-59\">2. \u7cfb\u7d71\u7684\u306a\u8abf\u67fb\u624b\u9806<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class MemoryInvestigator {\n    public void investigateMemoryIssue() {\n        \/\/ 1. \u57fa\u672c\u60c5\u5831\u306e\u53ce\u96c6\n        printBasicMemoryInfo();\n\n        \/\/ 2. GC\u72b6\u614b\u306e\u78ba\u8a8d\n        analyzeGCStatus();\n\n        \/\/ 3. \u30b9\u30ec\u30c3\u30c9\u30c0\u30f3\u30d7\u306e\u53d6\u5f97\n        captureThreadDump();\n\n        \/\/ 4. \u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\u306e\u53d6\u5f97\uff08\u5fc5\u8981\u306a\u5834\u5408\uff09\n        captureHeapDump();\n    }\n\n    private void printBasicMemoryInfo() {\n        Runtime runtime = Runtime.getRuntime();\n        System.out.printf(\"\"\"\n            \u30e1\u30e2\u30ea\u4f7f\u7528\u72b6\u6cc1:\n            \u6700\u5927\u30e1\u30e2\u30ea: %d MB\n            \u5272\u308a\u5f53\u3066\u6e08\u307f\u30e1\u30e2\u30ea: %d MB\n            \u7a7a\u304d\u30e1\u30e2\u30ea: %d MB%n\"\"\",\n            runtime.maxMemory() \/ 1024 \/ 1024,\n            runtime.totalMemory() \/ 1024 \/ 1024,\n            runtime.freeMemory() \/ 1024 \/ 1024);\n    }\n\n    private void analyzeGCStatus() {\n        List&lt;GarbageCollectorMXBean&gt; gcBeans = \n            ManagementFactory.getGarbageCollectorMXBeans();\n\n        for (GarbageCollectorMXBean gcBean : gcBeans) {\n            System.out.printf(\"\"\"\n                GC\u60c5\u5831 - %s:\n                \u53ce\u96c6\u56de\u6570: %d\n                \u53ce\u96c6\u6642\u9593: %d ms%n\"\"\",\n                gcBean.getName(),\n                gcBean.getCollectionCount(),\n                gcBean.getCollectionTime());\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-140\">\n<h3 class=\"wp-block-heading\" id=\"i-60\">6.2 \u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0\u30c4\u30fc\u30eb\u306e\u6d3b\u7528\u65b9\u6cd5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-141\">\n<h4 class=\"wp-block-heading\" id=\"i-61\">1. Java Flight Recorder (JFR) \u306e\u4f7f\u7528<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class JFRAnalysis {\n    public void startJFRRecording() {\n        try {\n            ProcessBuilder pb = new ProcessBuilder(\n                \"jcmd\", getPid(), \"JFR.start\",\n                \"duration=120s\",\n                \"filename=recording.jfr\",\n                \"settings=profile\"\n            );\n            Process p = pb.start();\n            p.waitFor();\n        } catch (Exception e) {\n            e.printStackTrace();\n        }\n    }\n\n    private String getPid() {\n        return ManagementFactory.getRuntimeMXBean()\n            .getName().split(\"@\")[0];\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-142\">\n<h4 class=\"wp-block-heading\" id=\"i-62\">2. VisualVM \u306b\u3088\u308b\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u5206\u6790<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class MemoryMonitoring {\n    \/\/ JMX\u63a5\u7d9a\u306e\u8a2d\u5b9a\n    public void enableJMXMonitoring() {\n        System.setProperty(\"com.sun.management.jmxremote\", \"true\");\n        System.setProperty(\"com.sun.management.jmxremote.port\", \"9010\");\n        System.setProperty(\"com.sun.management.jmxremote.authenticate\", \"false\");\n        System.setProperty(\"com.sun.management.jmxremote.ssl\", \"false\");\n    }\n\n    \/\/ \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u76e3\u8996\n    @Scheduled(fixedRate = 60000)\n    public void monitorMemoryUsage() {\n        MemoryMXBean memoryBean = ManagementFactory.getMemoryMXBean();\n        MemoryUsage heapUsage = memoryBean.getHeapMemoryUsage();\n\n        double usedPercentage = \n            (double) heapUsage.getUsed() \/ heapUsage.getMax() * 100;\n\n        if (usedPercentage &gt; 80) {\n            alertHighMemoryUsage(usedPercentage);\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-143\">\n<h3 class=\"wp-block-heading\" id=\"i-63\">6.3 \u5b9f\u969b\u306e\u30c8\u30e9\u30d6\u30eb\u4e8b\u4f8b\u3068\u89e3\u6c7a\u7b56<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-144\">\n<h4 class=\"wp-block-heading\" id=\"i-64\">1. \u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u3088\u308b\u30e1\u30e2\u30ea\u30ea\u30fc\u30af<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\npublic class ProblematicCache {\n    private static Map&lt;String, byte[]&gt; cache = new HashMap&lt;&gt;();\n\n    public void addToCache(String key, byte[] data) {\n        cache.put(key, data);  \/\/ \u5236\u9650\u306a\u304f\u30c7\u30fc\u30bf\u3092\u8ffd\u52a0\n    }\n}\n\n\/\/ \u6539\u5584\u5f8c\u306e\u30b3\u30fc\u30c9\npublic class ImprovedCache {\n    private static final int MAX_ENTRIES = 1000;\n    private static final int MAX_ENTRY_SIZE = 1024 * 1024;  \/\/ 1MB\n\n    private static Map&lt;String, SoftReference&lt;byte[]&gt;&gt; cache = \n        Collections.synchronizedMap(new LinkedHashMap&lt;&gt;(MAX_ENTRIES, 0.75f, true) {\n            @Override\n            protected boolean removeEldestEntry(Map.Entry&lt;String, SoftReference&lt;byte[]&gt;&gt; eldest) {\n                return size() &gt; MAX_ENTRIES;\n            }\n        });\n\n    public void addToCache(String key, byte[] data) {\n        if (data.length &gt; MAX_ENTRY_SIZE) {\n            throw new IllegalArgumentException(\"\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u304c\u5927\u304d\u3059\u304e\u307e\u3059\");\n        }\n        cache.put(key, new SoftReference&lt;&gt;(data));\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-145\">\n<h4 class=\"wp-block-heading\" id=\"i-65\">2. \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u4e0d\u9069\u5207\u306a\u4f7f\u7528<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\npublic class ListPerformanceIssue {\n    private List&lt;String&gt; items = new ArrayList&lt;&gt;();\n\n    public void processItems() {\n        for (int i = 0; i &lt; items.size(); i++) {\n            items.remove(0);  \/\/ \u5148\u982d\u304b\u3089\u306e\u524a\u9664\u306f O(n)\n        }\n    }\n}\n\n\/\/ \u6539\u5584\u5f8c\u306e\u30b3\u30fc\u30c9\npublic class OptimizedListProcessing {\n    private Deque&lt;String&gt; items = new ArrayDeque&lt;&gt;();\n\n    public void processItems() {\n        while (!items.isEmpty()) {\n            items.pollFirst();  \/\/ O(1) \u306e\u64cd\u4f5c\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-146\">\n<h4 class=\"wp-block-heading\" id=\"i-66\">3. \u30b9\u30ec\u30c3\u30c9\u30d7\u30fc\u30eb\u8a2d\u5b9a\u306e\u554f\u984c<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\npublic class ThreadPoolIssue {\n    private ExecutorService executor = \n        Executors.newFixedThreadPool(100);  \/\/ \u56fa\u5b9a\u30b5\u30a4\u30ba\u3067\u5927\u304d\u3059\u304e\u308b\n}\n\n\/\/ \u6539\u5584\u5f8c\u306e\u30b3\u30fc\u30c9\npublic class OptimizedThreadPool {\n    private final ThreadPoolExecutor executor;\n\n    public OptimizedThreadPool() {\n        int corePoolSize = Runtime.getRuntime().availableProcessors();\n        int maxPoolSize = corePoolSize * 2;\n\n        executor = new ThreadPoolExecutor(\n            corePoolSize,\n            maxPoolSize,\n            60L, TimeUnit.SECONDS,\n            new ArrayBlockingQueue&lt;&gt;(500),\n            new ThreadPoolExecutor.CallerRunsPolicy());\n\n        \/\/ \u30d7\u30fc\u30eb\u72b6\u614b\u306e\u76e3\u8996\n        monitorThreadPool();\n    }\n\n    private void monitorThreadPool() {\n        ScheduledExecutorService monitor = \n            Executors.newSingleThreadScheduledExecutor();\n\n        monitor.scheduleAtFixedRate(() -&gt; {\n            System.out.printf(\"\"\"\n                \u30b9\u30ec\u30c3\u30c9\u30d7\u30fc\u30eb\u72b6\u614b:\n                \u30a2\u30af\u30c6\u30a3\u30d6\u30b9\u30ec\u30c3\u30c9: %d\n                \u5b8c\u4e86\u30bf\u30b9\u30af\u6570: %d\n                \u30ad\u30e5\u30fc\u30b5\u30a4\u30ba: %d%n\"\"\",\n                executor.getActiveCount(),\n                executor.getCompletedTaskCount(),\n                executor.getQueue().size());\n        }, 0, 1, TimeUnit.MINUTES);\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-147\">\n<p>\u3053\u308c\u3089\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u624b\u6cd5\u3092\u9069\u5207\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30e1\u30e2\u30ea\u95a2\u9023\u306e\u554f\u984c\u3092\u52b9\u7387\u7684\u306b\u7279\u5b9a\u3057\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u672a\u6765\u3068\u6700\u65b0\u30c8\u30ec\u30f3\u30c9\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-148\">\n<h2 class=\"wp-block-heading\" id=\"i-67\">\uff17\uff0e\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u672a\u6765\u3068\u6700\u65b0\u30c8\u30ec\u30f3\u30c9<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-149\">\n<p>Java\u306e\u30e1\u30e2\u30ea\u7ba1\u7406\u306f\u3001\u30af\u30e9\u30a6\u30c9\u30cd\u30a4\u30c6\u30a3\u30d6\u74b0\u5883\u3084\u30b3\u30f3\u30c6\u30ca\u6280\u8853\u306e\u9032\u5316\u306b\u4f34\u3044\u3001\u5927\u304d\u306a\u5909\u9769\u671f\u3092\u8fce\u3048\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u6700\u65b0\u306e\u52d5\u5411\u3068\u5c06\u6765\u306e\u5c55\u671b\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-150\">\n<h3 class=\"wp-block-heading\" id=\"i-68\">7.1 Java 17\u4ee5\u964d\u306e\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u9032\u5316<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-151\">\n<h4 class=\"wp-block-heading\" id=\"i-69\">1. \u65b0\u4e16\u4ee3\u306e\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ModernGCExample {\n    \/**\n     * ZGC\u306e\u8a2d\u5b9a\u4f8b\n     * \u8d77\u52d5\u30aa\u30d7\u30b7\u30e7\u30f3:\n     * java -XX:+UseZGC -Xms4G -Xmx4G -XX:+ZGenerational\n     *\/\n    public static void demonstrateModernGC() {\n        \/\/ ZGC\u306e\u30e1\u30c8\u30ea\u30af\u30b9\u53d6\u5f97\n        List&lt;GarbageCollectorMXBean&gt; gcBeans = \n            ManagementFactory.getGarbageCollectorMXBeans();\n\n        gcBeans.forEach(gc -&gt; {\n            String gcName = gc.getName();\n            long collectionCount = gc.getCollectionCount();\n            long collectionTime = gc.getCollectionTime();\n\n            System.out.printf(\"\"\"\n                GC\u60c5\u5831:\n                \u540d\u79f0: %s\n                \u53ce\u96c6\u56de\u6570: %d\n                \u53ce\u96c6\u6642\u9593: %d ms\n                \u5e73\u5747\u53ce\u96c6\u6642\u9593: %.2f ms\n                \"\"\",\n                gcName,\n                collectionCount,\n                collectionTime,\n                collectionCount &gt; 0 ? \n                    (double) collectionTime \/ collectionCount : 0\n            );\n        });\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-152\">\n<h4 class=\"wp-block-heading\" id=\"i-70\">2. Virtual Threads\u5bfe\u5fdc\u306e\u30e1\u30e2\u30ea\u7ba1\u7406<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class VirtualThreadMemoryManagement {\n    public static void demonstrateVirtualThreads() throws Exception {\n        \/\/ \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\n        MemoryMXBean memoryBean = ManagementFactory.getMemoryMXBean();\n\n        \/\/ 1000\u500b\u306e\u4eee\u60f3\u30b9\u30ec\u30c3\u30c9\u3092\u4f5c\u6210\n        List&lt;Thread&gt; threads = new ArrayList&lt;&gt;();\n        for (int i = 0; i &lt; 1000; i++) {\n            Thread vThread = Thread.ofVirtual().start(() -&gt; {\n                try {\n                    Thread.sleep(1000);\n                } catch (InterruptedException e) {\n                    Thread.currentThread().interrupt();\n                }\n            });\n            threads.add(vThread);\n        }\n\n        \/\/ \u30e1\u30e2\u30ea\u4f7f\u7528\u72b6\u6cc1\u3092\u51fa\u529b\n        MemoryUsage heapUsage = memoryBean.getHeapMemoryUsage();\n        System.out.printf(\"\"\"\n            \u4eee\u60f3\u30b9\u30ec\u30c3\u30c9\u5b9f\u884c\u6642\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u72b6\u6cc1:\n            \u4f7f\u7528\u4e2d: %d MB\n            \u6700\u5927: %d MB\n            \u4f7f\u7528\u7387: %.2f%%\n            \"\"\",\n            heapUsage.getUsed() \/ 1024 \/ 1024,\n            heapUsage.getMax() \/ 1024 \/ 1024,\n            (double) heapUsage.getUsed() \/ heapUsage.getMax() * 100\n        );\n\n        \/\/ \u3059\u3079\u3066\u306e\u30b9\u30ec\u30c3\u30c9\u306e\u5b8c\u4e86\u3092\u5f85\u6a5f\n        for (Thread thread : threads) {\n            thread.join();\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-153\">\n<h3 class=\"wp-block-heading\" id=\"i-71\">7.2 \u30b3\u30f3\u30c6\u30ca\u74b0\u5883\u306b\u304a\u3051\u308b\u6700\u9069\u306a\u30e1\u30e2\u30ea\u8a2d\u5b9a<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-154\">\n<h4 class=\"wp-block-heading\" id=\"i-72\">1. \u30b3\u30f3\u30c6\u30ca\u30a2\u30a6\u30a7\u30a2\u306aJVM\u306e\u8a2d\u5b9a<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ContainerAwareSettings {\n    public static void printContainerSettings() {\n        \/\/ \u30b3\u30f3\u30c6\u30ca\u306e\u5236\u9650\u3092\u53d6\u5f97\n        OperatingSystemMXBean osBean = ManagementFactory\n            .getOperatingSystemMXBean();\n\n        if (osBean instanceof com.sun.management.OperatingSystemMXBean) {\n            com.sun.management.OperatingSystemMXBean sunOsBean = \n                (com.sun.management.OperatingSystemMXBean) osBean;\n\n            long physicalMemory = sunOsBean.getTotalPhysicalMemorySize();\n            long containerMemory = Runtime.getRuntime().maxMemory();\n\n            System.out.printf(\"\"\"\n                \u30b3\u30f3\u30c6\u30ca\u74b0\u5883\u306e\u8a2d\u5b9a:\n                \u7269\u7406\u30e1\u30e2\u30ea: %d MB\n                \u30b3\u30f3\u30c6\u30ca\u5236\u9650: %d MB\n                \u63a8\u5968JVM\u30aa\u30d7\u30b7\u30e7\u30f3:\n                -XX:+UseContainerSupport\n                -XX:MaxRAMPercentage=75.0\n                -XX:MinRAMPercentage=50.0\n                -XX:InitialRAMPercentage=50.0\n                \"\"\",\n                physicalMemory \/ 1024 \/ 1024,\n                containerMemory \/ 1024 \/ 1024\n            );\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-155\">\n<h4 class=\"wp-block-heading\" id=\"i-73\">2. Kubernetes\u74b0\u5883\u3067\u306e\u6700\u9069\u5316<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class KubernetesMemoryOptimization {\n    public static class ResourceLimits {\n        private final long memoryRequest;\n        private final long memoryLimit;\n\n        public ResourceLimits(long memoryRequest, long memoryLimit) {\n            this.memoryRequest = memoryRequest;\n            this.memoryLimit = memoryLimit;\n        }\n\n        public String generateKubernetesConfig() {\n            return String.format(\"\"\"\n                apiVersion: v1\n                kind: Pod\n                metadata:\n                  name: java-app\n                spec:\n                  containers:\n                  - name: java-app\n                    resources:\n                      requests:\n                        memory: \"%dMi\"\n                      limits:\n                        memory: \"%dMi\"\n                    env:\n                    - name: JAVA_OPTS\n                      value: &gt;-\n                        -XX:+UseContainerSupport\n                        -XX:MaxRAMPercentage=75.0\n                        -XX:InitialRAMPercentage=50.0\n                \"\"\",\n                memoryRequest,\n                memoryLimit\n            );\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-156\">\n<h3 class=\"wp-block-heading\" id=\"i-74\">7.3 \u6b21\u4e16\u4ee3\u306e\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u6280\u8853<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-157\">\n<h4 class=\"wp-block-heading\" id=\"i-75\">1. ZGC\uff08Z Garbage Collector\uff09\u306e\u6700\u9069\u5316<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ZGCOptimization {\n    public static void configureZGC() {\n        \/\/ ZGC\u306e\u63a8\u5968\u8a2d\u5b9a\n        System.out.println(\"\"\"\n            ZGC\u6700\u9069\u5316\u8a2d\u5b9a:\n\n            # \u57fa\u672c\u8a2d\u5b9a\n            -XX:+UseZGC\n            -XX:+ZGenerational      # \u4e16\u4ee3\u5225GC\u306e\u6709\u52b9\u5316\n            -XX:ConcGCThreads=2     # \u4e26\u884cGC\u30b9\u30ec\u30c3\u30c9\u6570\n\n            # \u30e1\u30e2\u30ea\u8a2d\u5b9a\n            -XX:MaxHeapSize=8g\n            -XX:InitialHeapSize=8g\n\n            # \u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u30d1\u30e9\u30e1\u30fc\u30bf\n            -XX:ZAllocationSpikeTolerance=2.0\n            -XX:ZCollectionInterval=5\n            -XX:ZFragmentationLimit=25\n            \"\"\");\n    }\n\n    public static void monitorZGCPerformance() {\n        \/\/ ZGC\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30e1\u30c8\u30ea\u30af\u30b9\u306e\u53ce\u96c6\n        long[] gcPauseTime = new long[100];\n        int index = 0;\n\n        GarbageCollectorMXBean zgcBean = ManagementFactory\n            .getGarbageCollectorMXBeans()\n            .stream()\n            .filter(gc -&gt; gc.getName().contains(\"Z\"))\n            .findFirst()\n            .orElse(null);\n\n        if (zgcBean != null) {\n            System.out.printf(\"\"\"\n                ZGC\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9:\n                \u53ce\u96c6\u56de\u6570: %d\n                \u7dcf\u5b9f\u884c\u6642\u9593: %d ms\n                \u5e73\u5747\u505c\u6b62\u6642\u9593: %.2f ms\n                \"\"\",\n                zgcBean.getCollectionCount(),\n                zgcBean.getCollectionTime(),\n                zgcBean.getCollectionCount() &gt; 0 ?\n                    (double) zgcBean.getCollectionTime() \/ \n                    zgcBean.getCollectionCount() : 0\n            );\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-158\">\n<p>\u3053\u308c\u3089\u306e\u6700\u65b0\u30c8\u30ec\u30f3\u30c9\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u7406\u89e3\u3057\u3001\u9069\u5207\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u6b21\u4e16\u4ee3\u306eJava\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u306b\u304a\u3044\u3066\u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u7ba1\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u30e1\u30e2\u30ea\u7ba1\u7406\u6280\u8853\u306f\u4eca\u5f8c\u3082\u9032\u5316\u3092\u7d9a\u3051\u308b\u305f\u3081\u3001\u7d99\u7d9a\u7684\u306a\u5b66\u7fd2\u3068\u9069\u7528\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-159\">\n<h2 class=\"wp-block-heading\" id=\"i-76\">\u307e\u3068\u3081\uff1a\u52b9\u679c\u7684\u306aJava\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u5b9f\u73fe\u306b\u5411\u3051\u3066<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-160\">\n<h3 class=\"wp-block-heading\" id=\"i-77\">\u672c\u8a18\u4e8b\u306e\u30dd\u30a4\u30f3\u30c8\u6574\u7406<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-161\">\n<h4 class=\"wp-block-heading\" id=\"i-78\">1. \u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u57fa\u672c\u539f\u5247<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-162\">\n<p>\u3000\u25cf JVM\u306e\u30e1\u30e2\u30ea\u69cb\u9020\u3092\u7406\u89e3\u3057\u3001\u5404\u9818\u57df\u306e\u7279\u6027\u3092\u628a\u63e1\u3059\u308b\u3053\u3068\u304c\u91cd\u8981<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-163\">\n<p>\u3000\u25cf \u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u4ed5\u7d44\u307f\u3092\u7406\u89e3\u3057\u3001\u9069\u5207\u306a\u8a2d\u5b9a\u3092\u884c\u3046\u3053\u3068\u3067\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-164\">\n<p>\u3000\u25cf \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u8a2d\u8a08\u30d1\u30bf\u30fc\u30f3\u3092\u63a1\u7528<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-165\">\n<h4 class=\"wp-block-heading\" id=\"i-79\">2. \u5b9f\u8df5\u7684\u306a\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-166\">\n<p>\u3000\u25cf \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u9069\u5207\u306a\u9078\u629e\u3068\u30b5\u30a4\u30ba\u8a2d\u5b9a<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-167\">\n<p>\u3000\u25cf \u30ad\u30e3\u30c3\u30b7\u30e5\u6226\u7565\u306e\u52b9\u679c\u7684\u306a\u5b9f\u88c5<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-168\">\n<p>\u3000\u25cf \u30ea\u30bd\u30fc\u30b9\u306e\u78ba\u5b9f\u306a\u89e3\u653e\u3068\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-169\">\n<p>\u3000\u25cf \u30d0\u30c3\u30c1\u51e6\u7406\u3067\u306e\u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u4f7f\u7528<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-170\">\n<h4 class=\"wp-block-heading\" id=\"i-80\">3. \u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-171\">\n<p>\u3000\u25cf \u7cfb\u7d71\u7684\u306a\u554f\u984c\u5207\u308a\u5206\u3051\u30a2\u30d7\u30ed\u30fc\u30c1<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-172\">\n<p>\u3000\u25cf \u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0\u30c4\u30fc\u30eb\u306e\u52b9\u679c\u7684\u306a\u6d3b\u7528<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-173\">\n<p>\u3000\u25cf \u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\u89e3\u6790\u306b\u3088\u308b\u6839\u672c\u539f\u56e0\u306e\u7279\u5b9a<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-174\">\n<p>\u3000\u25cf \u9069\u5207\u306a\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3068\u65e9\u671f\u8b66\u544a\u306e\u5b9f\u88c5<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-175\">\n<h3 class=\"wp-block-heading\" id=\"i-81\">\u73fe\u5834\u3067\u306e\u5b9f\u8df5\u306b\u5411\u3051\u305f\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-176\">\n<p><strong>\u2713 \u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u57fa\u672c\u8a2d\u5b9a<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-177\">\n<p>\u3000\u25cf JVM\u306e\u30d2\u30fc\u30d7\u30b5\u30a4\u30ba\u8a2d\u5b9a\u306e\u6700\u9069\u5316<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-178\">\n<p>\u3000\u25cf GC\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u9069\u5207\u306a\u9078\u629e<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-179\">\n<p>\u3000\u25cf \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u5bfe\u7b56\u306e\u5b9f\u88c5<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-180\">\n<p><strong>\u2713 \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-181\">\n<p>\u3000\u25cf \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u76e3\u8996\u4f53\u5236\u306e\u78ba\u7acb<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-182\">\n<p>\u3000\u25cf GC\u30ed\u30b0\u306e\u53ce\u96c6\u3068\u5206\u6790<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-183\">\n<p>\u3000\u25cf \u30a2\u30e9\u30fc\u30c8\u95be\u5024\u306e\u8a2d\u5b9a<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-184\">\n<p><strong>\u2713 \u30c8\u30e9\u30d6\u30eb\u5bfe\u7b56<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-185\">\n<p>\u3000\u25cf \u30d2\u30fc\u30d7\u30c0\u30f3\u30d7\u53d6\u5f97\u306e\u81ea\u52d5\u5316<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-186\">\n<p>\u3000\u25cf \u969c\u5bb3\u6642\u306e\u5bfe\u5fdc\u624b\u9806\u306e\u6574\u5099<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-187\">\n<p>\u3000\u25cf \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c6\u30b9\u30c8\u306e\u5b9f\u65bd<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-188\">\n<h3 class=\"wp-block-heading\" id=\"i-82\">\u4eca\u5f8c\u306e\u5b66\u7fd2\u306e\u305f\u3081\u306b<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-189\">\n<h4 class=\"wp-block-heading\" id=\"i-83\">1. \u63a8\u5968\u3055\u308c\u308b\u5b66\u7fd2\u30b9\u30c6\u30c3\u30d7<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-190\">\n<p>\u30001. \u57fa\u790e\u7406\u8ad6\u306e\u5fb9\u5e95\u7406\u89e3<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-191\">\n<p>\u30002. \u958b\u767a\u74b0\u5883\u3067\u306e\u5b9f\u8df5<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-192\">\n<p>\u30003. \u672c\u756a\u74b0\u5883\u3067\u306e\u9069\u7528<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-193\">\n<p>\u30004. \u7d99\u7d9a\u7684\u306a\u6539\u5584\u3068\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-194\">\n<h4 class=\"wp-block-heading\" id=\"i-84\">2. \u3055\u3089\u306a\u308b\u5b66\u7fd2\u30ea\u30bd\u30fc\u30b9<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-195\">\n<p>\u3000\u25cf Java\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-196\">\n<p>\u3000\u25cf GC\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u30ac\u30a4\u30c9<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-197\">\n<p>\u3000\u25cf \u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0\u30c4\u30fc\u30eb\u306e\u30de\u30cb\u30e5\u30a2\u30eb<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-198\">\n<p>\u3000\u25cf \u30b3\u30f3\u30c6\u30ca\u74b0\u5883\u3067\u306eJava\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u6700\u9069\u5316\u30ac\u30a4\u30c9<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-199\">\n<h4 class=\"wp-block-heading\" id=\"i-85\">3. \u6700\u65b0\u52d5\u5411\u306e\u30ad\u30e3\u30c3\u30c1\u30a2\u30c3\u30d7<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-200\">\n<p>\u3000\u25cf Java\u8a00\u8a9e\u306e\u9032\u5316\u306b\u4f34\u3046\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u5909\u66f4<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-201\">\n<p>\u3000\u25cf \u65b0\u3057\u3044GC\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306e\u767b\u5834<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-202\">\n<p>\u3000\u25cf \u30af\u30e9\u30a6\u30c9\u30cd\u30a4\u30c6\u30a3\u30d6\u74b0\u5883\u3067\u306e\u6700\u9069\u5316\u624b\u6cd5<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-203\">\n<p>\u3000\u25cf \u30b3\u30f3\u30c6\u30ca\u6280\u8853\u306e\u767a\u5c55<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-204\">\n<h3 class=\"wp-block-heading\" id=\"i-86\">\u6700\u5f8c\u306b<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-205\">\n<p>\u52b9\u679c\u7684\u306a\u30e1\u30e2\u30ea\u7ba1\u7406\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u54c1\u8cea\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5927\u304d\u304f\u5de6\u53f3\u3059\u308b\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002\u672c\u8a18\u4e8b\u3067\u7d39\u4ecb\u3057\u305f\u5185\u5bb9\u3092\u57fa\u306b\u3001\u4ee5\u4e0b\u306e\u70b9\u3092\u610f\u8b58\u3057\u3066\u5b9f\u8df5\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-206\">\n<p>\u30001. <strong>\u4e88\u9632\u7684\u30a2\u30d7\u30ed\u30fc\u30c1<\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-207\">\n<p>\u3000\u3000\u25cf \u8a2d\u8a08\u6bb5\u968e\u304b\u3089\u30e1\u30e2\u30ea\u7ba1\u7406\u3092\u8003\u616e<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-208\">\n<p>\u3000\u3000\u25cf \u5b9a\u671f\u7684\u306a\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3067\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u6b62<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-209\">\n<p>\u3000\u3000\u25cf \u7d99\u7d9a\u7684\u306a\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u306b\u3088\u308b\u65e9\u671f\u554f\u984c\u767a\u898b<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-210\">\n<p>\u30002. <strong><strong>\u6bb5\u968e\u7684\u306a\u6700\u9069\u5316<\/strong><\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-211\">\n<p>\u3000\u3000\u25cf \u57fa\u672c\u7684\u306a\u5bfe\u7b56\u304b\u3089\u958b\u59cb<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-212\">\n<p>\u3000\u3000\u25cf \u6e2c\u5b9a\u306b\u57fa\u3065\u304f\u6539\u5584<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-213\">\n<p>\u3000\u3000\u25cf \u6bb5\u968e\u7684\u306a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-214\">\n<p>\u30003. <strong><strong><strong>\u77e5\u8b58\u306e\u66f4\u65b0<\/strong><\/strong><\/strong><\/p>\n<\/div>\n\n<div id=\"sgb-css-id-215\">\n<p>\u3000\u3000\u25cf \u65b0\u3057\u3044\u6280\u8853\u3084\u624b\u6cd5\u306e\u30ad\u30e3\u30c3\u30c1\u30a2\u30c3\u30d7<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-216\">\n<p>\u3000\u3000\u25cf \u30c1\u30fc\u30e0\u5185\u3067\u306e\u77e5\u8b58\u5171\u6709<\/p>\n<\/div>\n\n\n<p>\u3000\u3000\u25cf \u5b9f\u8df5\u3092\u901a\u3058\u305f\u7d4c\u9a13\u306e\u84c4\u7a4d<\/p>\n\n\n<div id=\"sgb-css-id-217\">\n<p>\u30e1\u30e2\u30ea\u7ba1\u7406\u306f\u4e00\u5ea6\u306e\u5bfe\u7b56\u3067\u5b8c\u4e86\u3059\u308b\u3082\u306e\u3067\u306f\u306a\u304f\u3001\u7d99\u7d9a\u7684\u306a\u6539\u5584\u3068\u76e3\u8996\u304c\u5fc5\u8981\u3067\u3059\u3002\u672c\u8a18\u4e8b\u3067\u5b66\u3093\u3060\u77e5\u8b58\u3092\u57fa\u306b\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u7279\u6027\u306b\u5408\u308f\u305b\u305f\u6700\u9069\u306a\u30e1\u30e2\u30ea\u7ba1\u7406\u6226\u7565\u3092\u69cb\u7bc9\u3057\u3001\u5b9f\u8df5\u3057\u3066\u3044\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-218\">\n<p>\u5e38\u306b\u5909\u5316\u3057\u7d9a\u3051\u308bJava\u74b0\u5883\u306b\u304a\u3044\u3066\u3001\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u91cd\u8981\u6027\u306f\u4eca\u5f8c\u3082\u5909\u308f\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u306e\u8a18\u4e8b\u304c\u3001\u3088\u308a\u52b9\u679c\u7684\u306a\u30e1\u30e2\u30ea\u7ba1\u7406\u306e\u5b9f\u73fe\u3078\u306e\u7b2c\u4e00\u6b69\u3068\u306a\u308c\u3070\u5e78\u3044\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; 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