“`” Java \u865a\u62df\u673a\u5728\u6267\u884c Java \u7a0b\u5e8f\u7684\u8fc7\u7a0b\u4e2d\u4f1a\u628a\u5b83\u7ba1\u7406\u7684\u5185\u5b58\u5212\u5206\u6210\u82e5\u5e72\u4e2a\u4e0d\u540c\u7684\u6570\u636e\u533a\u57df\u3002JDK. 1.8 \u548c\u4e4b\u524d\u7684\u7248\u672c\u7565\u6709\u4e0d\u540c\uff0c\u4e0b\u9762\u4f1a\u4ecb\u7ecd\u5230\u3002<\/p>\n
<strong>JDK 1.8 \u4e4b\u524d\uff1a<\/strong><\/p>\n
<strong><br><\/strong><\/p>\n
<img src=""http:\/\/res.mianshigee.com\/upload\/article\/20200414\/5a725a41-beae-4828-977d-641666480b47.png"" style=""width: 694px;""><br><\/p>\n
<strong>JDK 1.8 \uff1a<\/strong><\/p>\n
<strong><br><\/strong><\/p>\n
<img src=""http:\/\/res.mianshigee.com\/upload\/article\/20200414\/7e217e6e-e228-4c31-afed-c66ed35f30b3.png"" style=""width: 694px;""><br><\/p>\n
<strong>\u7ebf\u7a0b\u79c1\u6709\u7684\uff1a<\/strong><\/p><\/p>\n
<ul><li>\u7a0b\u5e8f\u8ba1\u6570\u5668<\/li><li>\u865a\u62df\u673a\u6808<\/li><li>\u672c\u5730\u65b9\u6cd5\u6808<\/li><\/ul><\/p>\n
<strong>\u7ebf\u7a0b\u5171\u4eab\u7684\uff1a<\/strong><\/p>\n
<ul><li>\u5806<\/li><li>\u65b9\u6cd5\u533a<\/li><li>\u76f4\u63a5\u5185\u5b58 (\u975e\u8fd0\u884c\u65f6\u6570\u636e\u533a\u7684\u4e00\u90e8\u5206)<\/li><\/ul><\/p>\n
<h3>2.1 \u7a0b\u5e8f\u8ba1\u6570\u5668<\/h3><\/p>\n
\u7a0b\u5e8f\u8ba1\u6570\u5668\u662f\u4e00\u5757\u8f83\u5c0f\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u53ef\u4ee5\u770b\u4f5c\u662f\u5f53\u524d\u7ebf\u7a0b\u6240\u6267\u884c\u7684\u5b57\u8282\u7801\u7684\u884c\u53f7\u6307\u793a\u5668\u3002<strong>\u5b57\u8282\u7801\u89e3\u91ca\u5668\u5de5\u4f5c\u65f6\u901a\u8fc7\u6539\u53d8\u8fd9\u4e2a\u8ba1\u6570\u5668\u7684\u503c\u6765\u9009\u53d6\u4e0b\u4e00\u6761\u9700\u8981\u6267\u884c\u7684\u5b57\u8282\u7801\u6307\u4ee4\uff0c\u5206\u652f\u3001\u5faa\u73af\u3001\u8df3\u8f6c\u3001\u5f02\u5e38\u5904\u7406\u3001\u7ebf\u7a0b\u6062\u590d\u7b49\u529f\u80fd\u90fd\u9700\u8981\u4f9d\u8d56\u8fd9\u4e2a\u8ba1\u6570\u5668\u6765\u5b8c\u6210\u3002<\/strong><\/p>\n
\u53e6\u5916\uff0c<strong>\u4e3a\u4e86\u7ebf\u7a0b\u5207\u6362\u540e\u80fd\u6062\u590d\u5230\u6b63\u786e\u7684\u6267\u884c\u4f4d\u7f6e\uff0c\u6bcf\u6761\u7ebf\u7a0b\u90fd\u9700\u8981\u6709\u4e00\u4e2a\u72ec\u7acb\u7684\u7a0b\u5e8f\u8ba1\u6570\u5668\uff0c\u5404\u7ebf\u7a0b\u4e4b\u95f4\u8ba1\u6570\u5668\u4e92\u4e0d\u5f71\u54cd\uff0c\u72ec\u7acb\u5b58\u50a8\uff0c\u6211\u4eec\u79f0\u8fd9\u7c7b\u5185\u5b58\u533a\u57df\u4e3a\u201c\u7ebf\u7a0b\u79c1\u6709\u201d\u7684\u5185\u5b58\u3002<\/strong><\/p>\n
<strong>\u4ece\u4e0a\u9762\u7684\u4ecb\u7ecd\u4e2d\u6211\u4eec\u77e5\u9053\u7a0b\u5e8f\u8ba1\u6570\u5668\u4e3b\u8981\u6709\u4e24\u4e2a\u4f5c\u7528\uff1a<\/strong><\/p>\n
<ol><li>\u5b57\u8282\u7801\u89e3\u91ca\u5668\u901a\u8fc7\u6539\u53d8\u7a0b\u5e8f\u8ba1\u6570\u5668\u6765\u4f9d\u6b21\u8bfb\u53d6\u6307\u4ee4\uff0c\u4ece\u800c\u5b9e\u73b0\u4ee3\u7801\u7684\u6d41\u7a0b\u63a7\u5236\uff0c\u5982\uff1a\u987a\u5e8f\u6267\u884c\u3001\u9009\u62e9\u3001\u5faa\u73af\u3001\u5f02\u5e38\u5904\u7406\u3002<\/li><li>\u5728\u591a\u7ebf\u7a0b\u7684\u60c5\u51b5\u4e0b\uff0c\u7a0b\u5e8f\u8ba1\u6570\u5668\u7528\u4e8e\u8bb0\u5f55\u5f53\u524d\u7ebf\u7a0b\u6267\u884c\u7684\u4f4d\u7f6e\uff0c\u4ece\u800c\u5f53\u7ebf\u7a0b\u88ab\u5207\u6362\u56de\u6765\u7684\u65f6\u5019\u80fd\u591f\u77e5\u9053\u8be5\u7ebf\u7a0b\u4e0a\u6b21\u8fd0\u884c\u5230\u54ea\u513f\u4e86\u3002<\/li><\/ol><\/p>\n
<strong>\u6ce8\u610f\uff1a\u7a0b\u5e8f\u8ba1\u6570\u5668\u662f\u552f\u4e00\u4e00\u4e2a\u4e0d\u4f1a\u51fa\u73b0 OutOfMemoryError \u7684\u5185\u5b58\u533a\u57df\uff0c\u5b83\u7684\u751f\u547d\u5468\u671f\u968f\u7740\u7ebf\u7a0b\u7684\u521b\u5efa\u800c\u521b\u5efa\uff0c\u968f\u7740\u7ebf\u7a0b\u7684\u7ed3\u675f\u800c\u6b7b\u4ea1\u3002<\/strong><\/p>\n
<h3>2.2 Java \u865a\u62df\u673a\u6808<\/h3><\/p>\n
<strong>\u4e0e\u7a0b\u5e8f\u8ba1\u6570\u5668\u4e00\u6837\uff0cJava \u865a\u62df\u673a\u6808\u4e5f\u662f\u7ebf\u7a0b\u79c1\u6709\u7684\uff0c\u5b83\u7684\u751f\u547d\u5468\u671f\u548c\u7ebf\u7a0b\u76f8\u540c\uff0c\u63cf\u8ff0\u7684\u662f Java \u65b9\u6cd5\u6267\u884c\u7684\u5185\u5b58\u6a21\u578b\uff0c\u6bcf\u6b21\u65b9\u6cd5\u8c03\u7528\u7684\u6570\u636e\u90fd\u662f\u901a\u8fc7\u6808\u4f20\u9012\u7684\u3002<\/strong><\/p>\n
<strong>Java \u5185\u5b58\u53ef\u4ee5\u7c97\u7cd9\u7684\u533a\u5206\u4e3a\u5806\u5185\u5b58\uff08Heap\uff09\u548c\u6808\u5185\u5b58 (Stack),\u5176\u4e2d\u6808\u5c31\u662f\u73b0\u5728\u8bf4\u7684\u865a\u62df\u673a\u6808\uff0c\u6216\u8005\u8bf4\u662f\u865a\u62df\u673a\u6808\u4e2d\u5c40\u90e8\u53d8\u91cf\u8868\u90e8\u5206\u3002<\/strong> \uff08\u5b9e\u9645\u4e0a\uff0cJava \u865a\u62df\u673a\u6808\u662f\u7531\u4e00\u4e2a\u4e2a\u6808\u5e27\u7ec4\u6210\uff0c\u800c\u6bcf\u4e2a\u6808\u5e27\u4e2d\u90fd\u62e5\u6709\uff1a\u5c40\u90e8\u53d8\u91cf\u8868\u3001\u64cd\u4f5c\u6570\u6808\u3001\u52a8\u6001\u94fe\u63a5\u3001\u65b9\u6cd5\u51fa\u53e3\u4fe1\u606f\u3002\uff09<\/p>\n
<strong>\u5c40\u90e8\u53d8\u91cf\u8868\u4e3b\u8981\u5b58\u653e\u4e86\u7f16\u8bd1\u5668\u53ef\u77e5\u7684\u5404\u79cd\u6570\u636e\u7c7b\u578b<\/strong>\uff08boolean\u3001byte\u3001char\u3001short\u3001int\u3001float\u3001long\u3001double\uff09\u3001<strong>\u5bf9\u8c61\u5f15\u7528<\/strong>\uff08reference \u7c7b\u578b\uff0c\u5b83\u4e0d\u540c\u4e8e\u5bf9\u8c61\u672c\u8eab\uff0c\u53ef\u80fd\u662f\u4e00\u4e2a\u6307\u5411\u5bf9\u8c61\u8d77\u59cb\u5730\u5740\u7684\u5f15\u7528\u6307\u9488\uff0c\u4e5f\u53ef\u80fd\u662f\u6307\u5411\u4e00\u4e2a\u4ee3\u8868\u5bf9\u8c61\u7684\u53e5\u67c4\u6216\u5176\u4ed6\u4e0e\u6b64\u5bf9\u8c61\u76f8\u5173\u7684\u4f4d\u7f6e\uff09\u3002<\/p>\n
<strong>Java \u865a\u62df\u673a\u6808\u4f1a\u51fa\u73b0\u4e24\u79cd\u5f02\u5e38\uff1aStackOverFlowError \u548c OutOfMemoryError\u3002<\/strong><\/p>\n
<ul><li><strong>StackOverFlowError\uff1a<\/strong> \u82e5 Java \u865a\u62df\u673a\u6808\u7684\u5185\u5b58\u5927\u5c0f\u4e0d\u5141\u8bb8\u52a8\u6001\u6269\u5c55\uff0c\u90a3\u4e48\u5f53\u7ebf\u7a0b\u8bf7\u6c42\u6808\u7684\u6df1\u5ea6\u8d85\u8fc7\u5f53\u524d Java \u865a\u62df\u673a\u6808\u7684\u6700\u5927\u6df1\u5ea6\u7684\u65f6\u5019\uff0c\u5c31\u629b\u51fa StackOverFlowError \u5f02\u5e38\u3002<\/li><li><strong>OutOfMemoryError\uff1a<\/strong> \u82e5 Java \u865a\u62df\u673a\u6808\u7684\u5185\u5b58\u5927\u5c0f\u5141\u8bb8\u52a8\u6001\u6269\u5c55\uff0c\u4e14\u5f53\u7ebf\u7a0b\u8bf7\u6c42\u6808\u65f6\u5185\u5b58\u7528\u5b8c\u4e86\uff0c\u65e0\u6cd5\u518d\u52a8\u6001\u6269\u5c55\u4e86\uff0c\u6b64\u65f6\u629b\u51fa OutOfMemoryError \u5f02\u5e38\u3002<\/li><\/ul><\/p>\n
Java \u865a\u62df\u673a\u6808\u4e5f\u662f\u7ebf\u7a0b\u79c1\u6709\u7684\uff0c\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u6709\u5404\u81ea\u7684 Java \u865a\u62df\u673a\u6808\uff0c\u800c\u4e14\u968f\u7740\u7ebf\u7a0b\u7684\u521b\u5efa\u800c\u521b\u5efa\uff0c\u968f\u7740\u7ebf\u7a0b\u7684\u6b7b\u4ea1\u800c\u6b7b\u4ea1\u3002<\/p>\n
<strong>\u6269\u5c55\uff1a\u90a3\u4e48\u65b9\u6cd5\/\u51fd\u6570\u5982\u4f55\u8c03\u7528\uff1f<\/strong><\/p>\n
Java \u6808\u53ef\u7528\u7c7b\u6bd4\u6570\u636e\u7ed3\u6784\u4e2d\u6808\uff0cJava \u6808\u4e2d\u4fdd\u5b58\u7684\u4e3b\u8981\u5185\u5bb9\u662f\u6808\u5e27\uff0c\u6bcf\u4e00\u6b21\u51fd\u6570\u8c03\u7528\u90fd\u4f1a\u6709\u4e00\u4e2a\u5bf9\u5e94\u7684\u6808\u5e27\u88ab\u538b\u5165 Java \u6808\uff0c\u6bcf\u4e00\u4e2a\u51fd\u6570\u8c03\u7528\u7ed3\u675f\u540e\uff0c\u90fd\u4f1a\u6709\u4e00\u4e2a\u6808\u5e27\u88ab\u5f39\u51fa\u3002<\/p>\n
Java \u65b9\u6cd5\u6709\u4e24\u79cd\u8fd4\u56de\u65b9\u5f0f\uff1a<\/p>\n
<ol><li>return \u8bed\u53e5\u3002<\/li><li>\u629b\u51fa\u5f02\u5e38\u3002<\/li><\/ol><\/p>\n
\u4e0d\u7ba1\u54ea\u79cd\u8fd4\u56de\u65b9\u5f0f\u90fd\u4f1a\u5bfc\u81f4\u6808\u5e27\u88ab\u5f39\u51fa\u3002<\/p>\n
<h3>2.3 \u672c\u5730\u65b9\u6cd5\u6808<\/h3><\/p>\n
\u548c\u865a\u62df\u673a\u6808\u6240\u53d1\u6325\u7684\u4f5c\u7528\u975e\u5e38\u76f8\u4f3c\uff0c\u533a\u522b\u662f\uff1a <strong>\u865a\u62df\u673a\u6808\u4e3a\u865a\u62df\u673a\u6267\u884c Java \u65b9\u6cd5 \uff08\u4e5f\u5c31\u662f\u5b57\u8282\u7801\uff09\u670d\u52a1\uff0c\u800c\u672c\u5730\u65b9\u6cd5\u6808\u5219\u4e3a\u865a\u62df\u673a\u4f7f\u7528\u5230\u7684 Native \u65b9\u6cd5\u670d\u52a1\u3002<\/strong> \u5728 HotSpot \u865a\u62df\u673a\u4e2d\u548c Java \u865a\u62df\u673a\u6808\u5408\u4e8c\u4e3a\u4e00\u3002<\/p>\n
\u672c\u5730\u65b9\u6cd5\u88ab\u6267\u884c\u7684\u65f6\u5019\uff0c\u5728\u672c\u5730\u65b9\u6cd5\u6808\u4e5f\u4f1a\u521b\u5efa\u4e00\u4e2a\u6808\u5e27\uff0c\u7528\u4e8e\u5b58\u653e\u8be5\u672c\u5730\u65b9\u6cd5\u7684\u5c40\u90e8\u53d8\u91cf\u8868\u3001\u64cd\u4f5c\u6570\u6808\u3001\u52a8\u6001\u94fe\u63a5\u3001\u51fa\u53e3\u4fe1\u606f\u3002<\/p>\n
\u65b9\u6cd5\u6267\u884c\u5b8c\u6bd5\u540e\u76f8\u5e94\u7684\u6808\u5e27\u4e5f\u4f1a\u51fa\u6808\u5e76\u91ca\u653e\u5185\u5b58\u7a7a\u95f4\uff0c\u4e5f\u4f1a\u51fa\u73b0 StackOverFlowError \u548c OutOfMemoryError \u4e24\u79cd\u5f02\u5e38\u3002<\/p>\n
<h3>2.4 \u5806<\/h3><\/p>\n
Java \u865a\u62df\u673a\u6240\u7ba1\u7406\u7684\u5185\u5b58\u4e2d\u6700\u5927\u7684\u4e00\u5757\uff0cJava \u5806\u662f\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u7684\u4e00\u5757\u5185\u5b58\u533a\u57df\uff0c\u5728\u865a\u62df\u673a\u542f\u52a8\u65f6\u521b\u5efa\u3002<strong>\u6b64\u5185\u5b58\u533a\u57df\u7684\u552f\u4e00\u76ee\u7684\u5c31\u662f\u5b58\u653e\u5bf9\u8c61\u5b9e\u4f8b\uff0c\u51e0\u4e4e\u6240\u6709\u7684\u5bf9\u8c61\u5b9e\u4f8b\u4ee5\u53ca\u6570\u7ec4\u90fd\u5728\u8fd9\u91cc\u5206\u914d\u5185\u5b58\u3002<\/strong><\/p>\n
Java \u5806\u662f\u5783\u573e\u6536\u96c6\u5668\u7ba1\u7406\u7684\u4e3b\u8981\u533a\u57df\uff0c\u56e0\u6b64\u4e5f\u88ab\u79f0\u4f5c<strong>GC \u5806\uff08Garbage Collected Heap\uff09<\/strong>.\u4ece\u5783\u573e\u56de\u6536\u7684\u89d2\u5ea6\uff0c\u7531\u4e8e\u73b0\u5728\u6536\u96c6\u5668\u57fa\u672c\u90fd\u91c7\u7528\u5206\u4ee3\u5783\u573e\u6536\u96c6\u7b97\u6cd5\uff0c\u6240\u4ee5 Java \u5806\u8fd8\u53ef\u4ee5\u7ec6\u5206\u4e3a\uff1a\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\uff1a\u518d\u7ec6\u81f4\u4e00\u70b9\u6709\uff1aEden \u7a7a\u95f4\u3001From Survivor\u3001To Survivor \u7a7a\u95f4\u7b49\u3002<strong>\u8fdb\u4e00\u6b65\u5212\u5206\u7684\u76ee\u7684\u662f\u66f4\u597d\u5730\u56de\u6536\u5185\u5b58\uff0c\u6216\u8005\u66f4\u5feb\u5730\u5206\u914d\u5185\u5b58\u3002<\/strong><\/p>\n
<div align=""center""><\/div><\/p>\n
<img src=""http:\/\/res.mianshigee.com\/upload\/article\/20200414\/fdcabfdf-a899-4df8-90f1-ed2e22c6e12a.png"" style=""width: 574px;""><br><\/p>\n
\u4e0a\u56fe\u6240\u793a\u7684 eden \u533a\u3001s0 \u533a\u3001s1 \u533a\u90fd\u5c5e\u4e8e\u65b0\u751f\u4ee3\uff0ctentired \u533a\u5c5e\u4e8e\u8001\u5e74\u4ee3\u3002\u5927\u90e8\u5206\u60c5\u51b5\uff0c\u5bf9\u8c61\u90fd\u4f1a\u9996\u5148\u5728 Eden \u533a\u57df\u5206\u914d\uff0c\u5728\u4e00\u6b21\u65b0\u751f\u4ee3\u5783\u573e\u56de\u6536\u540e\uff0c\u5982\u679c\u5bf9\u8c61\u8fd8\u5b58\u6d3b\uff0c\u5219\u4f1a\u8fdb\u5165 s0 \u6216\u8005 s1\uff0c\u5e76\u4e14\u5bf9\u8c61\u7684\u5e74\u9f84\u8fd8\u4f1a\u52a0 1(Eden \u533a->Survivor \u533a\u540e\u5bf9\u8c61\u7684\u521d\u59cb\u5e74\u9f84\u53d8\u4e3a 1)\uff0c\u5f53\u5b83\u7684\u5e74\u9f84\u589e\u52a0\u5230\u4e00\u5b9a\u7a0b\u5ea6\uff08\u9ed8\u8ba4\u4e3a 15 \u5c81\uff09\uff0c\u5c31\u4f1a\u88ab\u664b\u5347\u5230\u8001\u5e74\u4ee3\u4e2d\u3002\u5bf9\u8c61\u664b\u5347\u5230\u8001\u5e74\u4ee3\u7684\u5e74\u9f84\u9608\u503c\uff0c\u53ef\u4ee5\u901a\u8fc7\u53c2\u6570 <code>-XX:MaxTenuringThreshold<\/code> \u6765\u8bbe\u7f6e\u3002<\/p>\n
<h3>2.5 \u65b9\u6cd5\u533a<\/h3><\/p>\n
\u65b9\u6cd5\u533a\u4e0e Java \u5806\u4e00\u6837\uff0c\u662f\u5404\u4e2a\u7ebf\u7a0b\u5171\u4eab\u7684\u5185\u5b58\u533a\u57df\uff0c\u5b83\u7528\u4e8e\u5b58\u50a8\u5df2\u88ab\u865a\u62df\u673a\u52a0\u8f7d\u7684\u7c7b\u4fe1\u606f\u3001\u5e38\u91cf\u3001\u9759\u6001\u53d8\u91cf\u3001\u5373\u65f6\u7f16\u8bd1\u5668\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u7b49\u6570\u636e\u3002\u867d\u7136 Java \u865a\u62df\u673a\u89c4\u8303\u628a\u65b9\u6cd5\u533a\u63cf\u8ff0\u4e3a\u5806\u7684\u4e00\u4e2a\u903b\u8f91\u90e8\u5206\uff0c\u4f46\u662f\u5b83\u5374\u6709\u4e00\u4e2a\u522b\u540d\u53eb\u505a <strong>Non-Heap\uff08\u975e\u5806\uff09<\/strong>\uff0c\u76ee\u7684\u5e94\u8be5\u662f\u4e0e Java \u5806\u533a\u5206\u5f00\u6765\u3002<\/p>\n
\u65b9\u6cd5\u533a\u4e5f\u88ab\u79f0\u4e3a\u6c38\u4e45\u4ee3\u3002\u5f88\u591a\u4eba\u90fd\u4f1a\u5206\u4e0d\u6e05\u65b9\u6cd5\u533a\u548c\u6c38\u4e45\u4ee3\u7684\u5173\u7cfb\uff0c\u4e3a\u6b64\u6211\u4e5f\u67e5\u9605\u4e86\u6587\u732e\u3002<\/p>\n
<h4>2.5.1 \u65b9\u6cd5\u533a\u548c\u6c38\u4e45\u4ee3\u7684\u5173\u7cfb<\/h4><\/p>\n
<blockquote>\u300aJava \u865a\u62df\u673a\u89c4\u8303\u300b\u53ea\u662f\u89c4\u5b9a\u4e86\u6709\u65b9\u6cd5\u533a\u8fd9\u4e48\u4e2a\u6982\u5ff5\u548c\u5b83\u7684\u4f5c\u7528\uff0c\u5e76\u6ca1\u6709\u89c4\u5b9a\u5982\u4f55\u53bb\u5b9e\u73b0\u5b83\u3002\u90a3\u4e48\uff0c\u5728\u4e0d\u540c\u7684 JVM \u4e0a\u65b9\u6cd5\u533a\u7684\u5b9e\u73b0\u80af\u5b9a\u662f\u4e0d\u540c\u7684\u4e86\u3002 <strong>\u65b9\u6cd5\u533a\u548c\u6c38\u4e45\u4ee3\u7684\u5173\u7cfb\u5f88\u50cf Java \u4e2d\u63a5\u53e3\u548c\u7c7b\u7684\u5173\u7cfb\uff0c\u7c7b\u5b9e\u73b0\u4e86\u63a5\u53e3\uff0c\u800c\u6c38\u4e45\u4ee3\u5c31\u662f HotSpot \u865a\u62df\u673a\u5bf9\u865a\u62df\u673a\u89c4\u8303\u4e2d\u65b9\u6cd5\u533a\u7684\u4e00\u79cd\u5b9e\u73b0\u65b9\u5f0f\u3002<\/strong> \u4e5f\u5c31\u662f\u8bf4\uff0c\u6c38\u4e45\u4ee3\u662f HotSpot \u7684\u6982\u5ff5\uff0c\u65b9\u6cd5\u533a\u662f Java \u865a\u62df\u673a\u89c4\u8303\u4e2d\u7684\u5b9a\u4e49\uff0c\u662f\u4e00\u79cd\u89c4\u8303\uff0c\u800c\u6c38\u4e45\u4ee3\u662f\u4e00\u79cd\u5b9e\u73b0\uff0c\u4e00\u4e2a\u662f\u6807\u51c6\u4e00\u4e2a\u662f\u5b9e\u73b0\uff0c\u5176\u4ed6\u7684\u865a\u62df\u673a\u5b9e\u73b0\u5e76\u6ca1\u6709\u6c38\u4e45\u4ee3\u8fd9\u4e00\u8bf4\u6cd5\u3002<\/p><\/blockquote><\/p>\n
<h4>2.5.2 \u5e38\u7528\u53c2\u6570<\/h4><\/p>\n
<p>JDK 1.8 \u4e4b\u524d\u6c38\u4e45\u4ee3\u8fd8\u6ca1\u88ab\u5f7b\u5e95\u79fb\u9664\u7684\u65f6\u5019\u901a\u5e38\u901a\u8fc7\u4e0b\u9762\u8fd9\u4e9b\u53c2\u6570\u6765\u8c03\u8282\u65b9\u6cd5\u533a\u5927\u5c0f<\/p>\n
<code>java-XX:PermSize=N \/\/\u65b9\u6cd5\u533a (\u6c38\u4e45\u4ee3) \u521d\u59cb\u5927\u5c0f-XX:MaxPermSize=N \/\/\u65b9\u6cd5\u533a (\u6c38\u4e45\u4ee3) \u6700\u5927\u5927\u5c0f,\u8d85\u8fc7\u8fd9\u4e2a\u503c\u5c06\u4f1a\u629b\u51fa OutOfMemoryError \u5f02\u5e38:java.lang.OutOfMemoryError: PermGen<\/code><\/p>\n
\u76f8\u5bf9\u800c\u8a00\uff0c\u5783\u573e\u6536\u96c6\u884c\u4e3a\u5728\u8fd9\u4e2a\u533a\u57df\u662f\u6bd4\u8f83\u5c11\u51fa\u73b0\u7684\uff0c\u4f46\u5e76\u975e\u6570\u636e\u8fdb\u5165\u65b9\u6cd5\u533a\u540e\u5c31\u201c\u6c38\u4e45\u5b58\u5728\u201d\u4e86\u3002<\/p>\n
JDK 1.8 \u7684\u65f6\u5019\uff0c\u65b9\u6cd5\u533a\uff08HotSpot \u7684\u6c38\u4e45\u4ee3\uff09\u88ab\u5f7b\u5e95\u79fb\u9664\u4e86\uff08JDK1.7 \u5c31\u5df2\u7ecf\u5f00\u59cb\u4e86\uff09\uff0c\u53d6\u800c\u4ee3\u4e4b\u662f\u5143\u7a7a\u95f4\uff0c\u5143\u7a7a\u95f4\u4f7f\u7528\u7684\u662f\u76f4\u63a5\u5185\u5b58\u3002<\/p>\n
\u4e0b\u9762\u662f\u4e00\u4e9b\u5e38\u7528\u53c2\u6570\uff1a<\/p>\n
<code>java-XX:MetaspaceSize=N \/\/\u8bbe\u7f6e Metaspace \u7684\u521d\u59cb\uff08\u548c\u6700\u5c0f\u5927\u5c0f\uff09-XX:MaxMetaspaceSize=N \/\/\u8bbe\u7f6e Metaspace \u7684\u6700\u5927\u5927\u5c0f<\/code><\/p>\n
\u4e0e\u6c38\u4e45\u4ee3\u5f88\u5927\u7684\u4e0d\u540c\u5c31\u662f\uff0c\u5982\u679c\u4e0d\u6307\u5b9a\u5927\u5c0f\u7684\u8bdd\uff0c\u968f\u7740\u66f4\u591a\u7c7b\u7684\u521b\u5efa\uff0c\u865a\u62df\u673a\u4f1a\u8017\u5c3d\u6240\u6709\u53ef\u7528\u7684\u7cfb\u7edf\u5185\u5b58\u3002<\/p>\n
<h4>2.5.3 \u4e3a\u4ec0\u4e48\u8981\u5c06\u6c38\u4e45\u4ee3 (PermGen) \u66ff\u6362\u4e3a\u5143\u7a7a\u95f4 (MetaSpace) \u5462?<\/h4><\/p>\n
\u6574\u4e2a\u6c38\u4e45\u4ee3\u6709\u4e00\u4e2a JVM \u672c\u8eab\u8bbe\u7f6e\u56fa\u5b9a\u5927\u5c0f\u4e0a\u9650\uff0c\u65e0\u6cd5\u8fdb\u884c\u8c03\u6574\uff0c\u800c\u5143\u7a7a\u95f4\u4f7f\u7528\u7684\u662f\u76f4\u63a5\u5185\u5b58\uff0c\u53d7\u672c\u673a\u53ef\u7528\u5185\u5b58\u7684\u9650\u5236\uff0c\u5e76\u4e14\u6c38\u8fdc\u4e0d\u4f1a\u5f97\u5230 java.lang.OutOfMemoryError\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 <code>-XX\uff1aMaxMetaspaceSize<\/code> \u6807\u5fd7\u8bbe\u7f6e\u6700\u5927\u5143\u7a7a\u95f4\u5927\u5c0f\uff0c\u9ed8\u8ba4\u503c\u4e3a unlimited\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u53ea\u53d7\u7cfb\u7edf\u5185\u5b58\u7684\u9650\u5236\u3002<code>-XX\uff1aMetaspaceSize<\/code> \u8c03\u6574\u6807\u5fd7\u5b9a\u4e49\u5143\u7a7a\u95f4\u7684\u521d\u59cb\u5927\u5c0f\u5982\u679c\u672a\u6307\u5b9a\u6b64\u6807\u5fd7\uff0c\u5219 Metaspace \u5c06\u6839\u636e\u8fd0\u884c\u65f6\u7684\u5e94\u7528\u7a0b\u5e8f\u9700\u6c42\u52a8\u6001\u5730\u91cd\u65b0\u8c03\u6574\u5927\u5c0f\u3002<\/p>\n
\u5f53\u7136\u8fd9\u53ea\u662f\u5176\u4e2d\u4e00\u4e2a\u539f\u56e0\uff0c\u8fd8\u6709\u5f88\u591a\u5e95\u5c42\u7684\u539f\u56e0\uff0c\u8fd9\u91cc\u5c31\u4e0d\u63d0\u4e86\u3002<\/p>\n
<h3>2.6 \u8fd0\u884c\u65f6\u5e38\u91cf\u6c60<\/h3><\/p>\n
\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u662f\u65b9\u6cd5\u533a\u7684\u4e00\u90e8\u5206\u3002Class \u6587\u4ef6\u4e2d\u9664\u4e86\u6709\u7c7b\u7684\u7248\u672c\u3001\u5b57\u6bb5\u3001\u65b9\u6cd5\u3001\u63a5\u53e3\u7b49\u63cf\u8ff0\u4fe1\u606f\u5916\uff0c\u8fd8\u6709\u5e38\u91cf\u6c60\u4fe1\u606f\uff08\u7528\u4e8e\u5b58\u653e\u7f16\u8bd1\u671f\u751f\u6210\u7684\u5404\u79cd\u5b57\u9762\u91cf\u548c\u7b26\u53f7\u5f15\u7528\uff09<\/p>\n
\u65e2\u7136\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u662f\u65b9\u6cd5\u533a\u7684\u4e00\u90e8\u5206\uff0c\u81ea\u7136\u53d7\u5230\u65b9\u6cd5\u533a\u5185\u5b58\u7684\u9650\u5236\uff0c\u5f53\u5e38\u91cf\u6c60\u65e0\u6cd5\u518d\u7533\u8bf7\u5230\u5185\u5b58\u65f6\u4f1a\u629b\u51fa OutOfMemoryError \u5f02\u5e38\u3002<\/p>\n
<strong>JDK1.7 \u53ca\u4e4b\u540e\u7248\u672c\u7684 JVM \u5df2\u7ecf\u5c06\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u4ece\u65b9\u6cd5\u533a\u4e2d\u79fb\u4e86\u51fa\u6765\uff0c\u5728 Java \u5806\uff08Heap\uff09\u4e2d\u5f00\u8f9f\u4e86\u4e00\u5757\u533a\u57df\u5b58\u653e\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u3002<\/strong> <\/p>\n
<img alt="""" src=""http:\/\/my-blog-to-use.oss-cn-beijing.aliyuncs.com\/18-9-14\/26038433.jpg"" style=""width: 100%;"">\u2014\u2014\u56fe\u7247\u6765\u6e90\uff1ahttps:\/\/blog.csdn.net\/wangbiao007\/article\/details\/78545189<\/p>\n
<h3>2.7 \u76f4\u63a5\u5185\u5b58<\/h3><\/p>\n
<strong>\u76f4\u63a5\u5185\u5b58\u5e76\u4e0d\u662f\u865a\u62df\u673a\u8fd0\u884c\u65f6\u6570\u636e\u533a\u7684\u4e00\u90e8\u5206\uff0c\u4e5f\u4e0d\u662f\u865a\u62df\u673a\u89c4\u8303\u4e2d\u5b9a\u4e49\u7684\u5185\u5b58\u533a\u57df\uff0c\u4f46\u662f\u8fd9\u90e8\u5206\u5185\u5b58\u4e5f\u88ab\u9891\u7e41\u5730\u4f7f\u7528\u3002\u800c\u4e14\u4e5f\u53ef\u80fd\u5bfc\u81f4 OutOfMemoryError \u5f02\u5e38\u51fa\u73b0\u3002<\/strong><\/p>\n
JDK1.4 \u4e2d\u65b0\u52a0\u5165\u7684 <strong>NIO(New Input\/Output) \u7c7b<\/strong>\uff0c\u5f15\u5165\u4e86\u4e00\u79cd\u57fa\u4e8e<strong>\u901a\u9053\uff08Channel\uff09<\/strong> \u4e0e<strong>\u7f13\u5b58\u533a\uff08Buffer\uff09<\/strong> \u7684 I\/O \u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 Native \u51fd\u6570\u5e93\u76f4\u63a5\u5206\u914d\u5806\u5916\u5185\u5b58\uff0c\u7136\u540e\u901a\u8fc7\u4e00\u4e2a\u5b58\u50a8\u5728 Java \u5806\u4e2d\u7684 DirectByteBuffer \u5bf9\u8c61\u4f5c\u4e3a\u8fd9\u5757\u5185\u5b58\u7684\u5f15\u7528\u8fdb\u884c\u64cd\u4f5c\u3002\u8fd9\u6837\u5c31\u80fd\u5728\u4e00\u4e9b\u573a\u666f\u4e2d\u663e\u8457\u63d0\u9ad8\u6027\u80fd\uff0c\u56e0\u4e3a<strong>\u907f\u514d\u4e86\u5728 Java \u5806\u548c Native \u5806\u4e4b\u95f4\u6765\u56de\u590d\u5236\u6570\u636e<\/strong>\u3002<\/p>\n
\u672c\u673a\u76f4\u63a5\u5185\u5b58\u7684\u5206\u914d\u4e0d\u4f1a\u53d7\u5230 Java \u5806\u7684\u9650\u5236\uff0c\u4f46\u662f\uff0c\u65e2\u7136\u662f\u5185\u5b58\u5c31\u4f1a\u53d7\u5230\u672c\u673a\u603b\u5185\u5b58\u5927\u5c0f\u4ee5\u53ca\u5904\u7406\u5668\u5bfb\u5740\u7a7a\u95f4\u7684\u9650\u5236\u3002<\/p>\n
<h2><\/h2><\/p>\n
<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
“`” Java \u865a\u62df\u673a\u5728\u6267\u884c Java \u7a0b\u5e8f\u7684\u8fc7\u7a0b\u4e2d\u4f1a\u628a\u5b83\u7ba1\u7406\u7684\u5185\u5b58\u5212\u5206\u6210\u82e5\u5e72\u4e2a\u4e0d\u540c […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-37289","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37289","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=37289"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37289\/revisions"}],"predecessor-version":[{"id":37290,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37289\/revisions\/37290"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=37289"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=37289"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=37289"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}