{"id":58228,"date":"2025-08-16T07:10:28","date_gmt":"2025-08-15T23:10:28","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/58228.html"},"modified":"2025-08-16T07:10:28","modified_gmt":"2025-08-15T23:10:28","slug":"jvm%e6%96%b9%e6%b3%95%e5%8c%ba%e5%86%85%e5%ad%98%e6%ba%a2%e5%87%ba%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/58228.html","title":{"rendered":"JVM\u65b9\u6cd5\u533a\u5185\u5b58\u6ea2\u51fa\u8be6\u89e3"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815231024-689fbe60bdb65.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\n<ul>\n<li>\u4e00\u3001\u65b9\u6cd5\u533a\u7684\u6f14\u8fdb\u4e0e\u5b9e\u73b0<\/li>\n<li>\n<ul>\n<li>1.1 JDK\u7248\u672c\u5dee\u5f02<\/li>\n<li>1.2 \u5b58\u50a8\u5185\u5bb9<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u3001\u65b9\u6cd5\u533a\u5185\u5b58\u6ea2\u51fa\u7684\u539f\u56e0<\/li>\n<li>\n<ul>\n<li>2.1 \u5e38\u89c1\u539f\u56e0<\/li>\n<li>2.2 \u5178\u578b\u4ee3\u7801\u793a\u4f8b<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u4e0d\u540cJDK\u7248\u672c\u4e0b\u7684\u6ea2\u51fa\u8868\u73b0<\/li>\n<li>\n<ul>\n<li>3.1 JDK7\u53ca\u4e4b\u524d&#xff08;PermGen&#xff09;<\/li>\n<li>3.2 JDK8&#043;&#xff08;Metaspace&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001\u8bca\u65ad\u65b9\u6cd5<\/li>\n<li>\n<ul>\n<li>4.1 \u76d1\u63a7\u5de5\u5177<\/li>\n<li>4.2 \u5173\u952e\u6307\u6807<\/li>\n<li>4.3 \u5185\u5b58\u8f6c\u50a8\u5206\u6790<\/li>\n<\/ul>\n<\/li>\n<li>\u4e94\u3001\u89e3\u51b3\u65b9\u6848<\/li>\n<li>\n<ul>\n<li>5.1 \u53c2\u6570\u8c03\u4f18<\/li>\n<li>5.2 \u4ee3\u7801\u4f18\u5316<\/li>\n<li>5.3 \u6846\u67b6\u914d\u7f6e<\/li>\n<\/ul>\n<\/li>\n<li>\u516d\u3001\u7279\u6b8a\u573a\u666f\u5904\u7406<\/li>\n<li>\n<ul>\n<li>6.1 OSGi\/\u6a21\u5757\u5316\u5e94\u7528<\/li>\n<li>6.2 \u52a8\u6001\u8bed\u8a00\u652f\u6301<\/li>\n<li>6.3 \u5b57\u8282\u7801\u589e\u5f3a\u6846\u67b6<\/li>\n<\/ul>\n<\/li>\n<li>\u4e03\u3001Metaspace\u7684\u5783\u573e\u56de\u6536<\/li>\n<li>\n<ul>\n<li>7.1 \u56de\u6536\u6761\u4ef6<\/li>\n<li>7.2 \u76f8\u5173\u53c2\u6570<\/li>\n<li>7.3 \u76d1\u63a7GC\u65e5\u5fd7<\/li>\n<\/ul>\n<\/li>\n<li>\u516b\u3001\u6700\u4f73\u5b9e\u8df5<\/li>\n<li>\u4e5d\u3001\u603b\u7ed3<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u65b9\u6cd5\u533a(Method Area)\u662fJVM\u89c4\u8303\u5b9a\u4e49\u7684\u4e00\u4e2a\u903b\u8f91\u5185\u5b58\u533a\u57df&#xff0c;\u7528\u4e8e\u5b58\u50a8\u7c7b\u4fe1\u606f\u3001\u5e38\u91cf\u3001\u9759\u6001\u53d8\u91cf\u7b49\u6570\u636e\u3002\u5728\u4e0d\u540c\u7684JVM\u7248\u672c\u4e2d&#xff0c;\u65b9\u6cd5\u533a\u7684\u5b9e\u73b0\u6709\u6240\u4e0d\u540c&#xff0c;\u4f46\u90fd\u53ef\u80fd\u51fa\u73b0\u5185\u5b58\u6ea2\u51fa\u7684\u60c5\u51b5\u3002\u672c\u6587\u5c06\u5168\u9762\u5256\u6790\u65b9\u6cd5\u533a\u5185\u5b58\u6ea2\u51fa\u7684\u539f\u56e0\u3001\u8868\u73b0\u3001\u8bca\u65ad\u65b9\u6cd5\u548c\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<h3>\u4e00\u3001\u65b9\u6cd5\u533a\u7684\u6f14\u8fdb\u4e0e\u5b9e\u73b0<\/h3>\n<h4>1.1 JDK\u7248\u672c\u5dee\u5f02<\/h4>\n<table>\n<tr>JDK\u7248\u672c\u65b9\u6cd5\u533a\u5b9e\u73b0\u76f8\u5173\u53c2\u6570<\/tr>\n<tbody>\n<tr>\n<td>JDK7\u53ca\u4e4b\u524d<\/td>\n<td>PermGen&#xff08;\u6c38\u4e45\u4ee3&#xff09;<\/td>\n<td>-XX:PermSize, -XX:MaxPermSize<\/td>\n<\/tr>\n<tr>\n<td>JDK8&#043;<\/td>\n<td>Metaspace&#xff08;\u5143\u7a7a\u95f4&#xff09;<\/td>\n<td>-XX:MetaspaceSize, -XX:MaxMetaspaceSize<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>1.2 \u5b58\u50a8\u5185\u5bb9<\/h4>\n<p>\u65b9\u6cd5\u533a\u4e3b\u8981\u5b58\u50a8&#xff1a;<\/p>\n<ul>\n<li>\u7c7b\u5143\u6570\u636e&#xff08;Class metadata&#xff09;<\/li>\n<li>\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60&#xff08;Runtime Constant Pool&#xff09;<\/li>\n<li>\u5b57\u6bb5\u548c\u65b9\u6cd5\u6570\u636e<\/li>\n<li>\u65b9\u6cd5\u548c\u6784\u9020\u51fd\u6570\u7684\u5b57\u8282\u7801<\/li>\n<li>JIT\u7f16\u8bd1\u540e\u7684\u4ee3\u7801&#xff08;\u90e8\u5206\u5b9e\u73b0&#xff09;<\/li>\n<\/ul>\n<p>  #mermaid-svg-0P6Z3ShpemoL3CKZ {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-0P6Z3ShpemoL3CKZ .error-icon{fill:#552222;}#mermaid-svg-0P6Z3ShpemoL3CKZ .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-0P6Z3ShpemoL3CKZ 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div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-0P6Z3ShpemoL3CKZ :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<\/p>\n<p>         <span id=\"L-L-A-B\" class=\"edgeLabel L-LS-A&#039; L-LE-B\"><\/span><\/p>\n<p>         <span id=\"L-L-A-C\" class=\"edgeLabel L-LS-A&#039; L-LE-C\"><\/span><\/p>\n<p>         <span id=\"L-L-A-D\" class=\"edgeLabel L-LS-A&#039; L-LE-D\"><\/span><\/p>\n<p>         <span id=\"L-L-A-E\" class=\"edgeLabel L-LS-A&#039; L-LE-E\"><\/span><\/p>\n<p>         <span id=\"L-L-A-F\" class=\"edgeLabel L-LS-A&#039; L-LE-F\"><\/span><\/p>\n<p>          \u65b9\u6cd5\u533a<\/p>\n<p>          \u7c7b\u4fe1\u606f<\/p>\n<p>          \u8fd0\u884c\u65f6\u5e38\u91cf\u6c60<\/p>\n<p>          \u5b57\u6bb5\u548c\u65b9\u6cd5\u6570\u636e<\/p>\n<p>          \u65b9\u6cd5\u5b57\u8282\u7801<\/p>\n<p>          JIT\u4ee3\u7801<\/p>\n<h3>\u4e8c\u3001\u65b9\u6cd5\u533a\u5185\u5b58\u6ea2\u51fa\u7684\u539f\u56e0<\/h3>\n<h4>2.1 \u5e38\u89c1\u539f\u56e0<\/h4>\n<li>\n<p>\u7c7b\u52a0\u8f7d\u8fc7\u591a<\/p>\n<ul>\n<li>\u52a8\u6001\u751f\u6210\u5927\u91cf\u7c7b&#xff08;\u5982CGlib\u3001ASM&#xff09;<\/li>\n<li>\u91cd\u590d\u90e8\u7f72\u5e94\u7528&#xff08;Tomcat\u70ed\u90e8\u7f72&#xff09;<\/li>\n<li>\u6846\u67b6\u8fc7\u5ea6\u4f7f\u7528\u53cd\u5c04\/\u4ee3\u7406<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u81a8\u80c0<\/p>\n<ul>\n<li>\u5927\u91cf\u5b57\u7b26\u4e32\u5e38\u91cf&#xff08;\u5c24\u5176\u8c03\u7528String.intern()&#xff09;<\/li>\n<li>\u5927\u91cf\u6570\u503c\u5e38\u91cf<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>JVM\u53c2\u6570\u914d\u7f6e\u4e0d\u5f53<\/p>\n<ul>\n<li>\u65b9\u6cd5\u533a\u5927\u5c0f\u8bbe\u7f6e\u8fc7\u5c0f<\/li>\n<li>\u672a\u9650\u5236\u52a8\u6001\u7c7b\u751f\u6210<\/li>\n<\/ul>\n<\/li>\n<h4>2.2 \u5178\u578b\u4ee3\u7801\u793a\u4f8b<\/h4>\n<p><span class=\"token comment\">\/\/ \u901a\u8fc7CGLib\u6301\u7eed\u751f\u6210\u7c7b\u5bfc\u81f4\u65b9\u6cd5\u533a\u6ea2\u51fa<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MethodAreaOOM<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Enhancer<\/span> enhancer <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Enhancer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            enhancer<span class=\"token punctuation\">.<\/span><span class=\"token function\">setSuperclass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">OOMObject<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            enhancer<span class=\"token punctuation\">.<\/span><span class=\"token function\">setUseCache<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5173\u952e&#xff1a;\u7981\u7528\u7f13\u5b58<\/span><br \/>\n            enhancer<span class=\"token punctuation\">.<\/span><span class=\"token function\">setCallback<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MethodInterceptor<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">(<\/span>obj<span class=\"token punctuation\">,<\/span> method<span class=\"token punctuation\">,<\/span> args1<span class=\"token punctuation\">,<\/span> proxy<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span><br \/>\n                proxy<span class=\"token punctuation\">.<\/span><span class=\"token function\">invokeSuper<\/span><span class=\"token punctuation\">(<\/span>obj<span class=\"token punctuation\">,<\/span> args1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            enhancer<span class=\"token punctuation\">.<\/span><span class=\"token function\">create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">OOMObject<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u4e09\u3001\u4e0d\u540cJDK\u7248\u672c\u4e0b\u7684\u6ea2\u51fa\u8868\u73b0<\/h3>\n<h4>3.1 JDK7\u53ca\u4e4b\u524d&#xff08;PermGen&#xff09;<\/h4>\n<p>\u9519\u8bef\u4fe1\u606f&#xff1a;<\/p>\n<p>java.lang.OutOfMemoryError: PermGen space<\/p>\n<p>\u7279\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u6c38\u4e45\u4ee3\u5927\u5c0f\u56fa\u5b9a<\/li>\n<li>Full GC\u65e0\u6cd5\u6709\u6548\u56de\u6536\u5143\u6570\u636e<\/li>\n<li>\u5e38\u89c1\u4e8e\u70ed\u90e8\u7f72\u573a\u666f<\/li>\n<\/ul>\n<h4>3.2 JDK8&#043;&#xff08;Metaspace&#xff09;<\/h4>\n<p>\u9519\u8bef\u4fe1\u606f&#xff1a;<\/p>\n<p>java.lang.OutOfMemoryError: Metaspace<\/p>\n<p>\u7279\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u9ed8\u8ba4\u4e0d\u9650\u5236\u5927\u5c0f&#xff08;\u53d7\u9650\u4e8e\u7cfb\u7edf\u5185\u5b58&#xff09;<\/li>\n<li>\u53ef\u8bbe\u7f6e\u6700\u5927\u5927\u5c0f<\/li>\n<li>\u5783\u573e\u56de\u6536\u66f4\u9ad8\u6548\u4f46\u4ecd\u53ef\u80fd\u6ea2\u51fa<\/li>\n<\/ul>\n<h3>\u56db\u3001\u8bca\u65ad\u65b9\u6cd5<\/h3>\n<h4>4.1 \u76d1\u63a7\u5de5\u5177<\/h4>\n<li>\n<p>JDK\u5de5\u5177&#xff1a;<\/p>\n<ul>\n<li>jstat -gcmetacapacity &lt;pid&gt;&#xff1a;\u67e5\u770b\u5143\u7a7a\u95f4\u4f7f\u7528<\/li>\n<li>jcmd &lt;pid&gt; VM.metaspace&#xff1a;\u8be6\u7ec6\u5143\u7a7a\u95f4\u7edf\u8ba1<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u53ef\u89c6\u5316\u5de5\u5177&#xff1a;<\/p>\n<ul>\n<li>VisualVM<\/li>\n<li>JConsole<\/li>\n<li>Eclipse MAT&#xff08;\u5206\u6790\u5185\u5b58\u8f6c\u50a8&#xff09;<\/li>\n<\/ul>\n<\/li>\n<h4>4.2 \u5173\u952e\u6307\u6807<\/h4>\n<table>\n<tr>\u6307\u6807\u6b63\u5e38\u8868\u73b0\u5371\u9669\u4fe1\u53f7<\/tr>\n<tbody>\n<tr>\n<td>\u5df2\u4f7f\u7528\u7a7a\u95f4<\/td>\n<td>\u5e73\u7a33\u6ce2\u52a8<\/td>\n<td>\u6301\u7eed\u589e\u957f<\/td>\n<\/tr>\n<tr>\n<td>\u5783\u573e\u56de\u6536<\/td>\n<td>\u5076\u5c14\u56de\u6536<\/td>\n<td>\u9891\u7e41Full GC<\/td>\n<\/tr>\n<tr>\n<td>\u52a0\u8f7d\u7c7b\u6570<\/td>\n<td>\u76f8\u5bf9\u7a33\u5b9a<\/td>\n<td>\u6301\u7eed\u589e\u52a0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>4.3 \u5185\u5b58\u8f6c\u50a8\u5206\u6790<\/h4>\n<p><span class=\"token comment\"># \u751f\u6210\u5185\u5b58\u8f6c\u50a8<\/span><br \/>\njcmd <span class=\"token operator\">&lt;<\/span>pid<span class=\"token operator\">&gt;<\/span> GC.heap_dump <span class=\"token assign-left variable\">filename<\/span><span class=\"token operator\">&#061;<\/span>metaspace.hprof<\/p>\n<p><span class=\"token comment\"># \u4f7f\u7528MAT\u5206\u6790\u7c7b\u52a0\u8f7d\u60c5\u51b5<\/span><\/p>\n<h3>\u4e94\u3001\u89e3\u51b3\u65b9\u6848<\/h3>\n<h4>5.1 \u53c2\u6570\u8c03\u4f18<\/h4>\n<p>JDK7\u53ca\u4e4b\u524d&#xff1a;<\/p>\n<p>-XX:PermSize<span class=\"token operator\">&#061;<\/span>128m -XX:MaxPermSize<span class=\"token operator\">&#061;<\/span>256m<\/p>\n<p>JDK8&#043;&#xff1a;<\/p>\n<p>-XX:MetaspaceSize<span class=\"token operator\">&#061;<\/span>128m -XX:MaxMetaspaceSize<span class=\"token operator\">&#061;<\/span>256m<\/p>\n<h4>5.2 \u4ee3\u7801\u4f18\u5316<\/h4>\n<li>\n<p>\u63a7\u5236\u52a8\u6001\u7c7b\u751f\u6210&#xff1a;<\/p>\n<p> <span class=\"token comment\">\/\/ \u542f\u7528\u7f13\u5b58&#xff08;CGLib\u793a\u4f8b&#xff09;<\/span><br \/>\nenhancer<span class=\"token punctuation\">.<\/span><span class=\"token function\">setUseCache<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<li>\n<p>\u8c28\u614e\u4f7f\u7528\u53cd\u5c04&#xff1a;<\/p>\n<ul>\n<li>\u7f13\u5b58Method\/Field\u5bf9\u8c61<\/li>\n<li>\u907f\u514d\u9891\u7e41\u8c03\u7528Class.forName()<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4f18\u5316&#xff1a;<\/p>\n<p> <span class=\"token comment\">\/\/ \u907f\u514d\u5927\u91cf\u8c03\u7528<\/span><br \/>\n<span class=\"token class-name\">String<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">intern<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<h4>5.3 \u6846\u67b6\u914d\u7f6e<\/h4>\n<p>Spring\u5e94\u7528&#xff1a;<\/p>\n<p># \u5173\u95ed\u4e0d\u5fc5\u8981\u7684\u4ee3\u7406<br \/>\nspring.aop.proxy-target-class&#061;false<\/p>\n<p>Tomcat\u70ed\u90e8\u7f72&#xff1a;<\/p>\n<p><span class=\"token comment\">&lt;!&#8211; \u914d\u7f6ereloadable&#061;false &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>Context<\/span> <span class=\"token attr-name\">reloadable<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>false<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h3>\u516d\u3001\u7279\u6b8a\u573a\u666f\u5904\u7406<\/h3>\n<h4>6.1 OSGi\/\u6a21\u5757\u5316\u5e94\u7528<\/h4>\n<p>\u95ee\u9898&#xff1a;<\/p>\n<ul>\n<li>\u7c7b\u52a0\u8f7d\u5668\u5c42\u6b21\u590d\u6742<\/li>\n<li>\u5bb9\u6613\u5bfc\u81f4\u7c7b\u5143\u6570\u636e\u5806\u79ef<\/li>\n<\/ul>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<ul>\n<li>\u9650\u5236\u6a21\u5757\u6570\u91cf<\/li>\n<li>\u5b9a\u671f\u91cd\u542f\u5bb9\u5668<\/li>\n<\/ul>\n<h4>6.2 \u52a8\u6001\u8bed\u8a00\u652f\u6301<\/h4>\n<p>Groovy\/Scala\u7b49&#xff1a;<\/p>\n<ul>\n<li>\u52a8\u6001\u751f\u6210\u7c7b\u8f83\u591a<\/li>\n<li>\u589e\u52a0\u65b9\u6cd5\u533a\u5927\u5c0f\u914d\u7f6e<\/li>\n<\/ul>\n<h4>6.3 \u5b57\u8282\u7801\u589e\u5f3a\u6846\u67b6<\/h4>\n<p>ASM\/Javassist&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528\u7c7b\u7f13\u5b58<\/span><br \/>\n<span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Class<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> classCache <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ConcurrentHashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">getEnhancedClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> origin<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> classCache<span class=\"token punctuation\">.<\/span><span class=\"token function\">computeIfAbsent<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        origin<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        k <span class=\"token operator\">-&gt;<\/span> <span class=\"token function\">generateEnhancedClass<\/span><span class=\"token punctuation\">(<\/span>origin<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u4e03\u3001Metaspace\u7684\u5783\u573e\u56de\u6536<\/h3>\n<h4>7.1 \u56de\u6536\u6761\u4ef6<\/h4>\n<li>\u7c7b\u52a0\u8f7d\u5668\u88ab\u5783\u573e\u56de\u6536<\/li>\n<li>\u5bf9\u5e94\u7684\u6240\u6709\u7c7b\u4e0d\u518d\u88ab\u5f15\u7528<\/li>\n<li>\u89e6\u53d1\u4e86Full GC<\/li>\n<h4>7.2 \u76f8\u5173\u53c2\u6570<\/h4>\n<p>-XX:&#043;MetaspaceSizingPolicy  <span class=\"token comment\"># \u81ea\u52a8\u8c03\u6574\u7b56\u7565<\/span><br \/>\n-XX:MinMetaspaceFreeRatio   <span class=\"token comment\"># \u6700\u5c0f\u7a7a\u95f2\u6bd4\u4f8b<\/span><br \/>\n-XX:MaxMetaspaceFreeRatio   <span class=\"token comment\"># \u6700\u5927\u7a7a\u95f2\u6bd4\u4f8b<\/span><\/p>\n<h4>7.3 \u76d1\u63a7GC\u65e5\u5fd7<\/h4>\n<p>-Xlog:gc*,gc&#043;metaspace*<span class=\"token operator\">&#061;<\/span>trace:file<span class=\"token operator\">&#061;<\/span>gc.log<\/p>\n<p>\u65e5\u5fd7\u793a\u4f8b&#xff1a;<\/p>\n<p>[Metaspace: 81920K-&gt;81920K(827392K)] <\/p>\n<h3>\u516b\u3001\u6700\u4f73\u5b9e\u8df5<\/h3>\n<li>\n<p>\u751f\u4ea7\u73af\u5883\u914d\u7f6e&#xff1a;<\/p>\n<p> <span class=\"token comment\"># JDK8&#043;\u63a8\u8350\u914d\u7f6e<\/span><br \/>\n-XX:MetaspaceSize<span class=\"token operator\">&#061;<\/span>128m<br \/>\n-XX:MaxMetaspaceSize<span class=\"token operator\">&#061;<\/span>256m<br \/>\n-XX:&#043;UseCompressedClassPointers\n <\/li>\n<li>\n<p>\u5f00\u53d1\u89c4\u8303&#xff1a;<\/p>\n<ul>\n<li>\u907f\u514d\u52a8\u6001\u751f\u6210\u5927\u91cf\u7c7b<\/li>\n<li>\u53ca\u65f6\u5378\u8f7d\u4e0d\u518d\u9700\u8981\u7684\u6a21\u5757<\/li>\n<li>\u8c28\u614e\u4f7f\u7528\u53cd\u5c04\u548c\u52a8\u6001\u4ee3\u7406<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u76d1\u63a7\u65b9\u6848&#xff1a;<\/p>\n<p> <span class=\"token comment\"># \u6301\u7eed\u76d1\u63a7\u5143\u7a7a\u95f4<\/span><br \/>\njstat -gcmetacapacity <span 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decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250815231027-689fbe634ddcc.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb757\u6b21\uff0c\u70b9\u8d5e18\u6b21\uff0c\u6536\u85cf20\u6b21\u3002JVM\u65b9\u6cd5\u533a\u5185\u5b58\u6ea2\u51fa\u8be6\u89e3<\/p>\n","protected":false},"author":2,"featured_media":58226,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,426],"topic":[],"class_list":["post-58228","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-java","tag-jvm"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>JVM\u65b9\u6cd5\u533a\u5185\u5b58\u6ea2\u51fa\u8be6\u89e3 - 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