{"id":969,"date":"2018-07-27T08:08:34","date_gmt":"2018-07-27T00:08:34","guid":{"rendered":"http:\/\/www.rain1024.com\/?p=969"},"modified":"2023-08-07T20:57:25","modified_gmt":"2023-08-07T12:57:25","slug":"article130","status":"publish","type":"post","link":"http:\/\/rain1024.com\/index.php\/2018\/07\/27\/article130\/","title":{"rendered":"\u300a\u6df1\u5165\u7406\u89e3Java\u865a\u62df\u673a\u300b\u8bfb\u4e66\u7b14\u8bb01\uff1aJava\u6280\u672f\u4f53\u7cfb\u3001Java\u5185\u5b58\u533a\u57df\u548c\u5185\u5b58\u6ea2\u51fa\u5f02\u5e38"},"content":{"rendered":"<header class=\"post-header\">\n<h1 class=\"post-title\">\u300a\u6df1\u5165\u7406\u89e3Java\u865a\u62df\u673a\u300b\u8bfb\u4e66\u7b14\u8bb01\uff1aJava\u6280\u672f\u4f53\u7cfb\u3001Java\u5185\u5b58\u533a\u57df\u548c\u5185\u5b58\u6ea2\u51fa\u5f02\u5e38<\/h1>\n<\/header>\n<div class=\"post-body\">\n<p>\u56fd\u5185JVM\u76f8\u5173\u4e66\u7c4dNO.1\uff0cJava\u7a0b\u5e8f\u5458\u5fc5\u8bfb\u3002\u8bfb\u4e66\u7b14\u8bb0\u7b2c\u4e00\u90e8\u5206\u5bf9\u5e94\u539f\u4e66\u7684\u524d\u4e24\u7ae0\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e86Java\u7684\u6280\u672f\u4f53\u7cfb\u3001Java\u865a\u62df\u673a\u7684\u53d1\u5c55\u5386\u53f2\u3001Java\u8fd0\u884c\u65f6\u533a\u57df\u7684\u5212\u5206\u3001\u5bf9\u8c61\u7684\u521b\u5efa\u548c\u8bbf\u95ee\u4ee5\u53ca\u5185\u5b58\u6ea2\u51fa\u7684\u5b9e\u6218\u3002<\/p>\n<h1 id=\"Part-1-\u8d70\u8fdbJava\">Part 1: \u8d70\u8fdbJava<\/h1>\n<h2 id=\"\u7b2c\u4e00\u7ae0-\u8d70\u8fdbJava\">\u7b2c\u4e00\u7ae0 \u8d70\u8fdbJava<\/h2>\n<h3 id=\"\u6982\u8ff0\">\u6982\u8ff0<\/h3>\n<p>Java\u7684\u4f18\u70b9<\/p>\n<ul>\n<li>\u7ed3\u6784\u4e25\u8c28\u3001\u9762\u5411\u5bf9\u8c61<\/li>\n<li>\u6446\u8131\u5e73\u53f0\u7684\u675f\u7f1a\uff0c\u4e00\u6b21\u7f16\u5199\u5230\u5904\u8fd0\u884c<\/li>\n<li>\u63d0\u4f9b\u4e86\u76f8\u5bf9\u5b89\u5168\u7684\u5185\u5b58\u7ba1\u7406\u548c\u8bbf\u95ee\u673a\u5236<\/li>\n<li>\u5b9e\u73b0\u4e86\u70ed\u70b9\u4ee3\u7801\u68c0\u6d4b\u548c\u8fd0\u884c\u65f6\u7f16\u8bd1\u53ca\u4f18\u5316<\/li>\n<li>\u4e00\u5957\u5b8c\u5584\u7684\u5e94\u7528\u7a0b\u5e8f\u63a5\u53e3\u4ee5\u53ca\u65e0\u6570\u7684\u7b2c\u4e09\u65b9\u7c7b\u5e93<\/li>\n<\/ul>\n<h3 id=\"Java\u6280\u672f\u4f53\u7cfb\">Java\u6280\u672f\u4f53\u7cfb<\/h3>\n<p>Sun\u5b98\u65b9\u6240\u5b9a\u4e49\u7684Java\u6280\u672f\u4f53\u7cfb\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>Java\u7a0b\u5e8f\u8bbe\u8ba1\u8bed\u8a00<\/li>\n<li>\u5404\u79cd\u786c\u4ef6\u5e73\u53f0\u4e0a\u7684Java\u865a\u62df\u673a<\/li>\n<li>Class\u6587\u4ef6\u683c\u5f0f<\/li>\n<li>Java API\u7c7b\u5e93<\/li>\n<li>\u6765\u81ea\u5546\u4e1a\u673a\u6784\u548c\u5f00\u6e90\u793e\u533a\u7684\u7b2c\u4e09\u65b9Java\u7c7b\u5e93<\/li>\n<\/ul>\n<p>JDK\u662f\u7528\u4e8e\u652f\u6301Java\u5f00\u53d1\u7684\u6700\u5c0f\u73af\u5883\uff0cJRE\u662f\u652f\u6301Java\u7a0b\u5e8f\u8fd0\u884c\u7684\u6807\u51c6\u73af\u5883\uff0c\u6574\u4e2aJava\u4f53\u7cfb\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<p><a class=\"fancybox\" href=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/java_tech_structure.png\" rel=\"group\"><img decoding=\"async\" src=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/java_tech_structure.png\" alt=\"Java\u6280\u672f\u4f53\u7cfb\" \/><\/a><\/p>\n<h3 id=\"Java\u53d1\u5c55\u53f2\">Java\u53d1\u5c55\u53f2<\/h3>\n<p><a class=\"fancybox\" href=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/java_timeline.png\" rel=\"group\"><img decoding=\"async\" src=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/java_timeline.png\" alt=\"Java\u6280\u672f\u53d1\u5c55\" \/><\/a><\/p>\n<ul>\n<li>JDK 1.0: Java\u865a\u62df\u673a\u3001Applet\u3001AWT\u7b49\uff1b<\/li>\n<li>JDK 1.1\uff1aJAR\u6587\u4ef6\u683c\u5f0f\u3001JDBC\u3001JavaBeans\u3001RMI\u3001\u5185\u90e8\u7c7b\u3001\u53cd\u5c04\uff1b<\/li>\n<li>JDK 1.2\uff1a\u62c6\u5206\u4e3aJ2SE\/J2EE\/J2ME\u3001\u5185\u7f6eJIT\u7f16\u8bd1\u5668\u3001\u4e00\u7cfb\u5217Collections\u96c6\u5408\u7c7b\uff1b<\/li>\n<li>JDK 1.3\uff1aJNDI\u670d\u52a1\u3001\u4f7f\u7528CORBA IIOP\u5b9e\u73b0RMI\u901a\u4fe1\u534f\u8bae\u3001Java 2D\u6539\u8fdb\uff1b<\/li>\n<li>JDK 1.4\uff1a\u6b63\u5219\u8868\u8fbe\u5f0f\u3001\u5f02\u5e38\u94fe\u3001NIO\u3001\u65e5\u5fd7\u7c7b\u3001XML\u89e3\u6790\u5668\u548cXSLT\u8f6c\u6362\u5668\uff1b<\/li>\n<li>JDK 1.5\uff1a\u81ea\u52a8\u88c5\u7bb1\u3001\u6cdb\u578b\u3001\u52a8\u6001\u6ce8\u89e3\u3001\u679a\u4e3e\u3001\u53ef\u53d8\u53c2\u6570\u3001\u904d\u5386\u5faa\u73af\u3001\u6539\u8fdb\u4e86Java\u5185\u5b58\u6a21\u578b\u3001\u63d0\u4f9b\u4e86java.util.concurrent\u5e76\u53d1\u5305\uff1b<\/li>\n<li>JDK 1.6\uff1a\u63d0\u4f9b\u52a8\u6001\u8bed\u8a00\u652f\u6301\u3001\u63d0\u4f9b\u7f16\u8bd1API\u548c\u5fae\u578bHTTP\u670d\u52a1\u5668API\u3001\u865a\u62df\u673a\u4f18\u5316\uff08\u9501\u4e0e\u540c\u6b65\u3001\u5783\u573e\u6536\u96c6\u3001\u7c7b\u52a0\u8f7d\u7b49\uff09\uff1b<\/li>\n<li>JDK 1.7\uff1aG1\u6536\u96c6\u5668\u3001\u52a0\u5f3a\u5bf9Java\u8bed\u8a00\u7684\u8c03\u7528\u652f\u6301\u3001\u5347\u7ea7\u7c7b\u52a0\u8f7d\u67b6\u6784\uff1b<\/li>\n<li>JDK 1.8\uff1aLambda\u8868\u8fbe\u5f0f\u7b49\uff1b<\/li>\n<\/ul>\n<h3 id=\"Java\u865a\u62df\u673a\u53d1\u5c55\u53f2\">Java\u865a\u62df\u673a\u53d1\u5c55\u53f2<\/h3>\n<ul>\n<li>Sun Classic\/Exact VM\uff1aClassic VM\u662f\u7b2c\u4e00\u6b3e\u5546\u7528\u865a\u62df\u673a\uff0c\u7eaf\u89e3\u6790\u5668\u65b9\u5f0f\u6765\u6267\u884cJava\u4ee3\u7801\uff0c\u5982\u679c\u8981\u4f7f\u7528JIT\u7f16\u8bd1\u5668\u5c31\u5fc5\u987b\u8fdb\u884c\u5916\u6302\uff0c\u89e3\u6790\u5668\u548c\u7f16\u8bd1\u5668\u4e0d\u80fd\u914d\u5408\u5de5\u4f5c\uff0c\u7f16\u8bd1\u5668\u6267\u884c\u6548\u7387\u975e\u5e38\u5dee\uff1bExact VM\u662fSun\u865a\u62df\u673a\u56e2\u961f\u66fe\u5728Solaris\u5e73\u53f0\u53d1\u5e03\u7684\u865a\u62df\u673a\uff0c\u652f\u6301\u4e24\u7ea7\u5373\u65f6\u7f16\u8bd1\u5668\u3001\u7f16\u8bd1\u5668\u548c\u89e3\u91ca\u5668\u6df7\u5408\u5de5\u4f5c\u3001\u4f7f\u7528\u51c6\u786e\u5185\u5b58\u7ba1\u7406\uff08\u865a\u62df\u673a\u53ef\u4ee5\u77e5\u9053\u5185\u5b58\u4e2d\u67d0\u4e2a\u4f4d\u7f6e\u7684\u6570\u636e\u5177\u4f53\u662f\u4ec0\u4e48\u7c7b\u578b\uff09\uff0c\u4f46\u5f88\u5feb\u5c31\u88abHotSpot VM\u6240\u53d6\u4ee3\uff1b<\/li>\n<li>Sun HotSpot VM\uff1aSun JDK\u548cOpenJDK\u6240\u5e26\u7684\u865a\u62df\u673a\uff0c\u76ee\u524d\u4f7f\u7528\u8303\u56f4\u6700\u5e7f\uff1b\u7ee7\u627f\u4e86\u524d\u4e24\u6b3e\u865a\u62df\u673a\u7684\u4f18\u70b9\uff0c\u8fd8\u652f\u6301\u70ed\u70b9\u4ee3\u7801\u63a2\u6d4b\u6280\u672f\uff08\u901a\u8fc7\u8ba1\u6570\u5668\u627e\u51fa\u6700\u5177\u7f16\u8bd1\u4ef7\u503c\u7684\u4ee3\u7801\uff09\uff1b2006\u5e74Sun\u516c\u53f8\u5ba3\u5e03JDK\u5305\u62ecHotSpot VM\u5f00\u6e90\uff0c\u5728\u6b64\u57fa\u7840\u4e0a\u5efa\u7acbOpenJDK\uff1b<\/li>\n<li>Sun Mobile-Embedded VM\/Meta-Circular VM\uff1a\u8fd8\u6709\u4e00\u4e9bSun\u5f00\u53d1\u7684\u9762\u5bf9\u79fb\u52a8\u548c\u5d4c\u5165\u5f0f\u53d1\u5e03\u7684\u548c\u5b9e\u9a8c\u6027\u8d28\u7684\u865a\u62df\u673a\uff1b<\/li>\n<li>BEA JRockit\/IBM J9 VM\uff1aJRockit VM\u53f7\u79f0\u662f\u4e16\u754c\u4e0a\u6700\u5feb\u7684Java\u865a\u62df\u673a\uff0c\u4e13\u6ce8\u4e8e\u670d\u52a1\u5668\u7aef\u5e94\u7528\uff0c\u4e0d\u5305\u542b\u89e3\u6790\u5668\u5b9e\u73b0\uff0c\u5168\u90e8\u9760\u5373\u65f6\u7f16\u8bd1\u5668\u7f16\u8bd1\u6267\u884c\uff1bJ9 VM\u5b9a\u4f4d\u4e8eHotSpot\u6bd4\u8f83\u63a5\u8fd1\uff0c\u4e3b\u8981\u76ee\u7684\u662f\u4f5c\u4e3aIBM\u516c\u53f8\u5404\u79cdJava\u4ea7\u54c1\u7684\u6267\u884c\u5e73\u53f0\uff1b<\/li>\n<li>Azul VM\/BEA Liquid VM\uff1a\u7279\u5b9a\u786c\u4ef6\u5e73\u53f0\u4e13\u6709\u7684\u9ad8\u6027\u80fd\u865a\u62df\u673a\uff1b<\/li>\n<li>Apache Harmony\/Google Android Dalvik VM\uff1aApache Harmony\u5305\u542b\u81ea\u5df1\u7684\u865a\u62df\u673a\u548cJava\u5e93\uff0c\u4f46\u6ca1\u6709\u901a\u8fc7TCK\u8ba4\u8bc1\uff1bDalvik VM\u662fAndroid\u5e73\u53f0\u7684\u6838\u5fc3\u7ec4\u6210\u90e8\u5206\uff0c\u5176\u5e76\u6ca1\u6709\u9075\u5faaJava\u865a\u62df\u673a\u89c4\u8303\uff0c\u4e0d\u80fd\u76f4\u63a5\u6267\u884cClass\u6587\u4ef6\uff0c\u4f7f\u7528\u7684\u662f\u5bc4\u5b58\u5668\u67b6\u6784\u800c\u4e0d\u662fJVM\u5e38\u89c1\u7684\u6808\u67b6\u6784\uff1b<\/li>\n<li>Microsoft JVM\u53ca\u5176\u4ed6\uff1a\u5fae\u8f6f\u66fe\u7ecf\u662fJava\u6280\u672f\u7684\u94c1\u6746\u652f\u6301\u8005\uff0c\u5f00\u53d1\u8fc7Windows\u4e0b\u6027\u80fd\u6700\u597d\u7684Java\u865a\u62df\u673a\uff0c\u4f46\u540e\u6765\u88abSun\u8d77\u8bc9\u7ec8\u6b62\u5176\u53d1\u5c55\uff1b<\/li>\n<\/ul>\n<h3 id=\"\u5c55\u671bJava\u6280\u672f\u7684\u672a\u6765\">\u5c55\u671bJava\u6280\u672f\u7684\u672a\u6765<\/h3>\n<ul>\n<li>\u6a21\u5757\u5316<\/li>\n<li>\u6df7\u5408\u8bed\u8a00<\/li>\n<li>\u591a\u6838\u5e76\u884c<\/li>\n<li>\u8fdb\u4e00\u6b65\u4e30\u5bcc\u8bed\u6cd5<\/li>\n<li>64\u4f4d\u865a\u62df\u673a<\/li>\n<\/ul>\n<h3 id=\"\u5b9e\u6218\uff1a\u81ea\u5df1\u7f16\u8bd1JDK\">\u5b9e\u6218\uff1a\u81ea\u5df1\u7f16\u8bd1JDK<\/h3>\n<ul>\n<li>\u4e0b\u8f7dOpenJDK\uff1a<a href=\"https:\/\/jdk7.java.net\/source.html\" target=\"_blank\" rel=\"external noopener\">https:\/\/jdk7.java.net\/source.html<\/a><\/li>\n<li>\u7cfb\u7edf\u9700\u6c42\uff1aUbuntu 64\u4f4d\u30015GB\u7684\u78c1\u76d8\u30011G\u5185\u5b58\uff1b<\/li>\n<li>\u6784\u5efa\u7f16\u8bd1\u73af\u5883\uff1a\u9700\u8981Bootstrap JDK(JDK6\u4ee5\u4e0a)\/Ant(1.7.1\u4ee5\u4e0a)\/GCC\u3002<\/li>\n<\/ul>\n<pre><code>sudo apt-get install build-essential gawk m4 openjdk-6-jdk libasound2-dev libcups2-dev libxrender-dev xorg-dev xutils-dev x11proto-print-dev binutils libmotif3 libmotif-dev ant\n<\/code><\/pre>\n<ul>\n<li>\u8fdb\u884c\u7f16\u8bd1\uff1a\u8bbe\u7f6e\u73af\u5883\u53d8\u91cf\u3001make sanity\u68c0\u67e5\u3001make\u7f16\u8bd1\u3001\u590d\u5236\u5230JAVA_HOME\u3001\u7f16\u8f91env.sh<\/li>\n<\/ul>\n<h3 id=\"\u5728IDE\u5de5\u5177\u4e2d\u8fdb\u884c\u6e90\u7801\u8c03\u8bd5\">\u5728IDE\u5de5\u5177\u4e2d\u8fdb\u884c\u6e90\u7801\u8c03\u8bd5<\/h3>\n<p>NetBeans\uff08\u652f\u6301C\/C++\u5f00\u53d1\u7684\u7248\u672c\uff09<\/p>\n<h3 id=\"\u672c\u7ae0\u5c0f\u7ed3\">\u672c\u7ae0\u5c0f\u7ed3<\/h3>\n<p>\u672c\u7ae0\u4ecb\u7ecd\u4e86Java\u6280\u672f\u4f53\u7cfb\u7684\u8fc7\u53bb\u3001\u73b0\u5728\u4ee5\u53ca\u672a\u6765\u7684\u4e00\u4e9b\u53d1\u5c55\u8d8b\u52bf\uff0c\u5e76\u72ec\u7acb\u7f16\u8bd1\u4e00\u4e2aOpenJDK 7\u7684\u7248\u672c\u3002<\/p>\n<h1 id=\"Part-2-\u81ea\u52a8\u5185\u5b58\u7ba1\u7406\u673a\u5236\">Part 2 \u81ea\u52a8\u5185\u5b58\u7ba1\u7406\u673a\u5236<\/h1>\n<h2 id=\"\u7b2c\u4e8c\u7ae0-Java\u5185\u5b58\u533a\u57df\u4e0e\u5185\u5b58\u6ea2\u51fa\u5f02\u5e38\">\u7b2c\u4e8c\u7ae0 Java\u5185\u5b58\u533a\u57df\u4e0e\u5185\u5b58\u6ea2\u51fa\u5f02\u5e38<\/h2>\n<h3 id=\"\u6982\u8ff0-1\">\u6982\u8ff0<\/h3>\n<p>\u5bf9\u4e8eJava\u7a0b\u5e8f\u5458\u6765\u8bf4\uff0c\u5728\u865a\u62df\u673a\u81ea\u52a8\u5185\u5b58\u7ba1\u7406\u673a\u5236\u4e0b\uff0c\u4e0d\u9700\u8981\u4e3anew\u64cd\u4f5c\u53bb\u5199\u914d\u5bf9\u7684delete\/free\u4ee3\u7801\uff0c\u4e0d\u5bb9\u6613\u51fa\u73b0\u5185\u5b58\u6cc4\u6f0f\u3002\u4f46\u662f\u5982\u679c\u51fa\u73b0\u5185\u5b58\u6cc4\u6f0f\u95ee\u9898\uff0c\u5982\u679c\u4e0d\u4e86\u89e3\u865a\u62df\u673a\u7684\u673a\u5236\uff0c\u4fbf\u96be\u4ee5\u5b9a\u4f4d\u3002<\/p>\n<h3 id=\"\u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df\">\u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df<\/h3>\n<p><a class=\"fancybox\" href=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/jvm_runtime_data_area.png\" rel=\"group\"><img decoding=\"async\" src=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/jvm_runtime_data_area.png\" alt=\"\u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df\" \/><\/a><\/p>\n<h4 id=\"\u7a0b\u5e8f\u8ba1\u6570\u5668\">\u7a0b\u5e8f\u8ba1\u6570\u5668<\/h4>\n<ul>\n<li>\u4e00\u5757\u8f83\u5c0f\u7684\u5185\u5b58\uff0c\u53ef\u4ee5\u770b\u4f5c\u662f\u5f53\u524d\u7ebf\u7a0b\u6240\u6267\u884c\u7684\u5b57\u8282\u7801\u7684\u884c\u53f7\u6307\u793a\u5668\uff1b<\/li>\n<li>\u5728\u865a\u62df\u673a\u6982\u5ff5\u6a21\u578b\uff08\u5404\u79cd\u865a\u62df\u673a\u5b9e\u73b0\u53ef\u80fd\u4e0d\u4e00\u6837\uff09\u4e2d\uff0c\u5b57\u8282\u7801\u89e3\u91ca\u5668\u5de5\u4f5c\u65f6\u5c31\u662f\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\uff1b<\/li>\n<li>\u7a0b\u5e8f\u8ba1\u6570\u5668\u662f\u5c5e\u4e8e\u7ebf\u7a0b\u79c1\u6709\u7684\u5185\u5b58\uff1b<\/li>\n<li>\u5982\u679c\u6267\u884c\u7684\u662fJava\u65b9\u6cd5\uff0c\u8be5\u8ba1\u6570\u5668\u8bb0\u5f55\u7684\u662f\u6b63\u5728\u6267\u884c\u7684\u865a\u62df\u673a\u5b57\u8282\u7801\u6307\u4ee4\u7684\u5730\u5740\uff1b\u5982\u679c\u662fNative\u65b9\u6cd5\u5219\u4e3a\u7a7a\uff1b<\/li>\n<\/ul>\n<h4 id=\"Java\u865a\u62df\u673a\u6808\">Java\u865a\u62df\u673a\u6808<\/h4>\n<ul>\n<li>Java\u865a\u62df\u673a\u6808\u4e5f\u662f\u7ebf\u7a0b\u79c1\u6709\u7684\uff1b<\/li>\n<li>\u63cf\u8ff0\u7684\u662fJava\u65b9\u6cd5\u6267\u884c\u7684\u5185\u5b58\u6a21\u578b\uff1a\u6bcf\u4e2a\u65b9\u6cd5\u5728\u6267\u884c\u7684\u540c\u65f6\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u6808\u5e27\uff08Stack Frame\uff09\u7528\u4e8e\u5b58\u50a8\u5c40\u90e8\u53d8\u91cf\u8868\u3001\u64cd\u4f5c\u6570\u6808\u3001\u52a8\u6001\u94fe\u63a5\u3001\u65b9\u6cd5\u51fa\u53e3\u7b49\u4fe1\u606f\u3002\u6bcf\u4e00\u4e2a\u65b9\u6cd5\u4ece\u8c03\u7528\u76f4\u81f3\u6267\u884c\u5b8c\u6210\u7684\u8fc7\u7a0b\uff0c\u5c31\u5bf9\u5e94\u7740\u4e00\u4e2a\u6808\u5e27\u5728\u865a\u62df\u673a\u4e2d\u5165\u6808\u5230\u51fa\u6808\u7684\u8fc7\u7a0b\uff1b<\/li>\n<li>\u5c40\u90e8\u53d8\u91cf\u8868\u5b58\u653e\u4e86\u7f16\u8bd1\u5668\u53ef\u77e5\u7684\u5404\u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\u3001\u5bf9\u8c61\u5f15\u7528\u548creturnAddress\u7c7b\u578b\uff1b\u5176\u6240\u9700\u7684\u5185\u5b58\u7a7a\u95f4\u5728\u7f16\u8f91\u671f\u5b8c\u6210\u5206\u914d\uff0c\u4e0d\u4f1a\u518d\u8fd0\u884c\u671f\u6539\u53d8\uff1b<\/li>\n<li>\u53ef\u80fd\u5b58\u5728\u4e24\u79cd\u5f02\u5e38\uff1aStackOverflowError\u548cOutOfMemoryError\uff1b<\/li>\n<\/ul>\n<h4 id=\"\u672c\u5730\u65b9\u6cd5\u6808\">\u672c\u5730\u65b9\u6cd5\u6808<\/h4>\n<ul>\n<li>\u4e0e\u865a\u62df\u673a\u6808\u975e\u5e38\u76f8\u4f3c\uff0c\u53ea\u4e0d\u8fc7\u662f\u4e3a\u865a\u62df\u673a\u4f7f\u7528\u5230\u7684Native\u65b9\u6cd5\u670d\u52a1\uff1b<\/li>\n<li>\u53ef\u80fd\u5b58\u5728\u4e24\u79cd\u5f02\u5e38\uff1aStackOverflowError\u548cOutOfMemoryError\uff1b<\/li>\n<\/ul>\n<h4 id=\"Java\u5806\">Java\u5806<\/h4>\n<ul>\n<li>Java\u5806\u662f\u88ab\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u7684\uff0c\u5728\u865a\u62df\u673a\u542f\u52a8\u65f6\u521b\u5efa\uff1b<\/li>\n<li>\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\u90fd\u5728\u8fd9\u5206\u914d\uff1b<\/li>\n<li>\u662f\u5783\u573e\u6536\u96c6\u5668\u7ba1\u7406\u7684\u4e3b\u8981\u533a\u57df\uff0c\u53ef\u4ee5\u5206\u4e3a\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\uff1b<\/li>\n<li>\u53ef\u4ee5\u7269\u7406\u4e0d\u8fde\u7eed\uff0c\u53ea\u8981\u903b\u8f91\u4e0a\u662f\u8fde\u7eed\u7684\u5373\u53ef\uff1b<\/li>\n<li>\u5982\u679c\u5806\u4e2d\u6ca1\u6709\u5185\u5b58\u5b8c\u6210\u5b9e\u4f8b\u5206\u914d\u4e5f\u65e0\u6cd5\u518d\u6269\u5c55\u65f6\uff0c\u4f1a\u629b\u51faOutOfMemoryError\u5f02\u5e38\uff1b<\/li>\n<\/ul>\n<h4 id=\"\u65b9\u6cd5\u533a\">\u65b9\u6cd5\u533a<\/h4>\n<ul>\n<li>\u662f\u7ebf\u7a0b\u5171\u4eab\u7684\u533a\u57df\uff1b<\/li>\n<li>\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\uff1b<\/li>\n<li>\u8be5\u533a\u57df\u5bf9\u4e8e\u5783\u573e\u6536\u96c6\u6765\u8bf4\u6761\u4ef6\u6bd4\u8f83\u82db\u523b\uff0c\u4f46\u662f\u8fd8\u662f\u975e\u5e38\u6709\u5fc5\u8981\u8981\u8fdb\u884c\u56de\u6536\u5904\u7406\uff1b<\/li>\n<li>\u5f53\u65e0\u6cd5\u6ee1\u8db3\u5185\u5b58\u5206\u914d\u9700\u6c42\u65f6\uff0c\u5c06\u629b\u51faOutOfMemoryError\u5f02\u5e38\uff1b<\/li>\n<\/ul>\n<h4 id=\"\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\">\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60<\/h4>\n<ul>\n<li>\u662f\u65b9\u6cd5\u533a\u7684\u4e00\u90e8\u5206\uff1b<\/li>\n<li>Class\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\u4e00\u9879\u4fe1\u606f\u662f\u5e38\u91cf\u6c60\uff0c\u7528\u4e8e\u5b58\u653e\u7f16\u8bd1\u5668\u751f\u6210\u7684\u5404\u79cd\u5b57\u9762\u91cf\u548c\u7b26\u53f7\u5f15\u7528\uff0c\u8fd9\u90e8\u5206\u5185\u5bb9\u5c06\u5728\u7c7b\u52a0\u8f7d\u540e\u8fdb\u5165\u65b9\u6cd5\u533a\u7684\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u4e2d\u5b58\u653e\uff1b<\/li>\n<li>Java\u865a\u62df\u673a\u89c4\u8303\u8981\u6c42\u8f83\u5c11\uff0c\u901a\u5e38\u8fd8\u4f1a\u628a\u7ffb\u8bd1\u51fa\u6765\u7684\u76f4\u63a5\u5f15\u7528\u4e5f\u5b58\u50a8\u5728\u6b64\uff1b<\/li>\n<li>\u53e6\u5916\u4e00\u4e2a\u91cd\u8981\u7279\u5f81\u662f\u5177\u5907\u52a8\u6001\u6027\uff0c\u53ef\u4ee5\u5728\u8fd0\u884c\u671f\u95f4\u5c06\u65b0\u7684\u5e38\u91cf\u653e\u5165\u6c60\u4e2d\uff0c\u5982String\u7684intern\u65b9\u6cd5\uff1b<\/li>\n<li>\u53ef\u80fd\u5b58\u5728\u7684\u5f02\u5e38\uff1aOutOfMemoryError\uff1b<\/li>\n<\/ul>\n<h4 id=\"\u76f4\u63a5\u5185\u5b58\">\u76f4\u63a5\u5185\u5b58<\/h4>\n<ul>\n<li>\u5e76\u4e0d\u662f\u865a\u62df\u673a\u8fd0\u884c\u65f6\u6570\u636e\u533a\u7684\u4e00\u90e8\u5206\uff0c\u4e5f\u4e0d\u662fJava\u865a\u62df\u673a\u89c4\u8303\u4e2d\u5b9a\u4e49\u7684\u5185\u5b58\u533a\u57df\uff1b<\/li>\n<li>JDK 1.4\u7684NIO\u5f15\u5165\u4e86\u57fa\u4e8e\u901a\u9053\uff08Channel\uff09\u548c\u7f13\u51b2\u533a\uff08Buffer\uff09\u7684IO\u65b9\u6cd5\uff0c\u53ef\u4ee5\u4f7f\u7528Native\u51fd\u6570\u5e93\u76f4\u63a5\u5206\u914d\u5bf9\u5916\u5185\u5b58\uff0c\u7136\u540e\u901a\u8fc7\u4e00\u4e2a\u5b58\u50a8\u5728Java\u5806\u4e2d\u7684DirectByteBuffer\u5bf9\u8c61\u4f5c\u4e3a\u8fd9\u5757\u5185\u5b58\u7684\u5f15\u7528\u8fdb\u884c\u64cd\u4f5c\u4ee5\u63d0\u5347\u6027\u80fd\uff1b<\/li>\n<\/ul>\n<h3 id=\"HotSpot\u865a\u62df\u673a\u5bf9\u8c61\u63a2\u79d8\">HotSpot\u865a\u62df\u673a\u5bf9\u8c61\u63a2\u79d8<\/h3>\n<p>\u8fdb\u4e00\u6b65\u4e86\u89e3\u865a\u62df\u673a\u5185\u5b58\u4e2d\u6570\u636e\u7684\u5176\u4ed6\u7ec6\u8282\uff0c\u6bd4\u5982\u5b83\u4eec\u662f\u5982\u4f55\u521b\u5efa\u3001\u5982\u4f55\u5e03\u5c40\u4ee5\u53ca\u5982\u4f55\u8bbf\u95ee\u7684\u3002\u4e0b\u9762\u4ee5\u865a\u62df\u673aHotSpot\u548c\u5e38\u7528\u7684\u5185\u5b58\u533a\u57dfJava\u5806\u4e3a\u4f8b\uff0c\u6df1\u5165\u63a2\u8ba8HotSpot\u865a\u62df\u673a\u5728Java\u5806\u4e2d\u5bf9\u8c61\u5206\u914d\u3001\u5e03\u5c40\u548c\u8bbf\u95ee\u7684\u5168\u8fc7\u7a0b\u3002<\/p>\n<h4 id=\"\u5bf9\u8c61\u7684\u521b\u5efa\">\u5bf9\u8c61\u7684\u521b\u5efa<\/h4>\n<ul>\n<li>\u865a\u62df\u673a\u9047\u5230\u4e00\u6761new\u6307\u4ee4\u65f6\uff0c\u5148\u68c0\u67e5\u6307\u4ee4\u7684\u53c2\u6570\u662f\u5426\u80fd\u5728\u5e38\u91cf\u6c60\u4e2d\u5b9a\u4f4d\u5230\u4e00\u4e2a\u7c7b\u7684\u7b26\u53f7\uff0c\u5e76\u4e14\u68c0\u67e5\u8fd9\u4e2a\u7b26\u53f7\u5f15\u7528\u4ee3\u7801\u7684\u7c7b\u662f\u5426\u5df2\u88ab\u52a0\u8f7d\u3001\u89e3\u6790\u548c\u521d\u59cb\u5316\u8fc7\u3002\u5982\u679c\u6ca1\u6709\uff0c\u90a3\u5fc5\u987b\u5148\u6267\u884c\u76f8\u5e94\u7684\u7c7b\u52a0\u8f7d\u8fc7\u7a0b\uff1b<\/li>\n<li>\u63a5\u4e0b\u6765\u865a\u62df\u673a\u5c06\u4e3a\u65b0\u751f\u5bf9\u8c61\u5206\u914d\u5185\u5b58\u3002\u5bf9\u8c61\u6240\u9700\u7684\u5185\u5b58\u5927\u5c0f\u5728\u7c7b\u52a0\u8f7d\u5b8c\u6210\u540e\u4fbf\u5b8c\u5168\u786e\u5b9a\uff0c\u4e3a\u5bf9\u8c61\u5206\u914d\u7a7a\u95f4\u7b49\u540c\u4e8e\u628a\u4e00\u5757\u786e\u5b9a\u5927\u5c0f\u7684\u5185\u5b58\u4eceJava\u5806\u4e2d\u5212\u5206\u51fa\u6765\u3002\u5728\u4f7f\u7528Serial\u3001ParNew\u7b49\u5e26Compact\u8fc7\u7a0b\u7684\u6536\u96c6\u5668\u65f6\uff0c\u7cfb\u7edf\u91c7\u7528\u7684\u5206\u914d\u7b97\u6cd5\u662f\u6307\u9488\u78b0\u649e\uff08\u5185\u5b58\u7edd\u5bf9\u89c4\u6574\uff0c\u53ea\u8981\u901a\u8fc7\u6307\u9488\u4f5c\u4e3a\u5206\u754c\u70b9\u6807\u8bc6\uff09\uff1b\u800c\u4f7f\u7528CMS\u8fd9\u79cd\u57fa\u4e8eMark-Sweep\u7b97\u6cd5\u6536\u96c6\u5668\u65f6\uff0c\u901a\u5e38\u4f7f\u7528\u7a7a\u95f2\u5217\u8868\uff08\u5185\u5b58\u4e0d\u89c4\u6574\uff0c\u901a\u8fc7\u7ef4\u62a4\u4e00\u4e2a\u5217\u8868\u8bb0\u5f55\u90a3\u5757\u5185\u5b58\u662f\u53ef\u7528\u7684\uff09\uff1b<\/li>\n<li>\u53e6\u5916\u4e00\u4e2a\u9700\u8981\u8003\u8651\u7684\u5e76\u53d1\u4e0b\u7684\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\uff0c\u6709\u4e24\u79cd\u65b9\u6848\uff1a\u4e00\u662f\u5206\u914d\u5185\u5b58\u7a7a\u95f4\u7684\u52a8\u4f5c\u8fdb\u884c\u540c\u6b65\u5904\u7406\uff08\u5b9e\u9645\u4e0a\u865a\u62df\u673a\u91c7\u7528CAS\u914d\u4e0a\u5931\u8d25\u91cd\u8bd5\u7684\u65b9\u5f0f\u4fdd\u8bc1\u66f4\u65b0\u64cd\u4f5c\u7684\u539f\u5b50\u6027\uff09\uff1b\u4e8c\u662f\u4e3a\u6bcf\u4e2a\u7ebf\u7a0b\u5206\u914d\u4e00\u5c0f\u5757\u5185\u5b58\uff08\u79f0\u4e3a\u672c\u5730\u7ebf\u7a0b\u5206\u914d\u7f13\u51b2\uff0cTLAB\uff09\uff0c\u5404\u4e2a\u7ebf\u7a0b\u72ec\u7acb\u5206\u914d\uff0c\u53ea\u6709TLAB\u7528\u5b8c\u9700\u8981\u5206\u914d\u65b0\u7684\u624d\u9700\u8981\u540c\u6b65\u9501\u5b9a\uff0c\u865a\u62df\u673a\u901a\u8fc7-XX:+\/-UseTLAB\u53c2\u6570\u6765\u8bbe\u5b9a\uff1b<\/li>\n<li>\u5185\u5b58\u5206\u914d\u5b8c\u540e\uff0c\u865a\u62df\u673a\u5c06\u5206\u914d\u5230\u7684\u5185\u5b58\u7a7a\u95f4\u90fd\u521d\u59cb\u5316\u4e3a\u96f6\u503c\uff08\u4e0d\u5305\u62ec\u5bf9\u8c61\u5934\uff09\uff0c\u8fd9\u4fdd\u8bc1\u4e86\u5bf9\u8c61\u7684\u5b9e\u4f8b\u5b57\u6bb5\u5728Java\u4ee3\u7801\u4e2d\u53ef\u4ee5\u4e0d\u8d4b\u503c\u5c31\u76f4\u63a5\u4f7f\u7528\uff0c\u7a0b\u5e8f\u80fd\u8bbf\u95ee\u5230\u8fd9\u4e9b\u5b57\u6bb5\u6570\u636e\u7c7b\u578b\u5bf9\u5e94\u7684\u96f6\u503c\uff1b<\/li>\n<li>\u63a5\u4e0b\u6765\u8bbe\u7f6e\u5bf9\u8c61\u7684\u5bf9\u8c61\u5934\uff08Object Header\uff09\u4fe1\u606f\uff0c\u5305\u62ec\u5bf9\u8c61\u662f\u54ea\u4e2a\u7c7b\u7684\u5b9e\u4f8b\u3001\u5982\u4f55\u624d\u80fd\u627e\u5230\u7c7b\u7684\u5143\u6570\u636e\u4fe1\u606f\u3001\u5bf9\u8c61\u7684\u54c8\u5e0c\u7801\u3001\u5bf9\u8c61GC\u5206\u4ee3\u5e74\u9f84\u7b49\uff1b<\/li>\n<li>\u63a5\u7740\u6267\u884c\u65b9\u6cd5\uff0c\u628a\u5bf9\u8c61\u6309\u7167\u7a0b\u5e8f\u5458\u7684\u610f\u613f\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u8fd9\u6837\u4e00\u4e2a\u771f\u6b63\u53ef\u7528\u7684\u5bf9\u8c61\u624d\u7b97\u5b8c\u5168\u4ea7\u751f\u51fa\u6765\uff1b<\/li>\n<li>HotSpot\u89e3\u91ca\u5668\u7684\u4ee3\u7801\u7247\u6bb5\uff1a\u7565<\/li>\n<\/ul>\n<h4 id=\"\u5bf9\u8c61\u7684\u5185\u5b58\u5e03\u5c40\">\u5bf9\u8c61\u7684\u5185\u5b58\u5e03\u5c40<\/h4>\n<ul>\n<li>\u5bf9\u8c61\u5728\u5185\u5b58\u4e2d\u5b58\u50a8\u7684\u5e03\u5c40\u53ef\u4ee5\u5206\u4e3a3\u5757\u533a\u57df\uff1a\u5bf9\u8c61\u5934\uff08Object Header\uff09\u3001\u5b9e\u4f8b\u6570\u636e\uff08Instance Data\uff09\u548c\u5bf9\u9f50\u586b\u5145\uff08Padding\uff09\uff1b<\/li>\n<li>\u5bf9\u8c61\u5934\u5305\u62ec\u4e24\u90e8\u5206\u4fe1\u606f\uff1a\u7b2c\u4e00\u90e8\u5206\u7528\u4e8e\u5b58\u50a8\u5bf9\u8c61\u81ea\u8eab\u7684\u8fd0\u884c\u65f6\u6570\u636e\uff0c\u5982\u54c8\u5e0c\u7801\u3001GC\u5206\u4ee3\u5e74\u9f84\u3001\u9501\u72b6\u6001\u6807\u5fd7\u3001\u7ebf\u7a0b\u6301\u6709\u7684\u9501\u3001\u504f\u5411\u7ebf\u7a0bID\u3001\u504f\u5411\u65f6\u95f4\u6233\u7b49\uff1b\u53e6\u4e00\u90e8\u5206\u662f\u7c7b\u578b\u6307\u9488\uff0c\u5373\u5bf9\u8c61\u6307\u5411\u5b83\u7684\u7c7b\u5143\u6570\u636e\u7684\u6307\u9488\uff0c\u865a\u62df\u673a\u901a\u8fc7\u8fd9\u4e2a\u6307\u9488\u6765\u786e\u5b9a\u8fd9\u4e2a\u5bf9\u8c61\u662f\u54ea\u4e2a\u7c7b\u7684\u5b9e\u4f8b\uff08\u5e76\u4e0d\u662f\u6240\u6709\u865a\u62df\u673a\u90fd\u5fc5\u987b\u5728\u5bf9\u8c61\u6570\u636e\u4e0a\u4fdd\u7559\u7c7b\u578b\u6307\u9488\uff09\u3002\u53e6\u5916\u5982\u679c\u5bf9\u8c61\u662f\u4e00\u4e2aJava\u6570\u7ec4\uff0c\u5bf9\u8c61\u5934\u4e2d\u8fd8\u5fc5\u987b\u6709\u4e00\u5757\u7528\u4e8e\u8bb0\u5f55\u6570\u7ec4\u957f\u5ea6\u7684\u6570\u636e\u3002<\/li>\n<li>\u5b9e\u4f8b\u6570\u636e\u90e8\u5206\u662f\u771f\u6b63\u5b58\u50a8\u7684\u6709\u6548\u4fe1\u606f\uff0c\u4e5f\u662f\u5728\u4ee3\u7801\u4e2d\u6240\u5b9a\u4e49\u7684\u5404\u79cd\u7c7b\u578b\u5b57\u6bb5\u5185\u5bb9\u3002\u65e0\u8bba\u662f\u7236\u7c7b\u7ee7\u627f\u7684\u8fd8\u662f\u5b50\u7c7b\u4e2d\u5b9a\u4e49\u7684\u90fd\u9700\u8981\u8bb0\u5f55\u4e0b\u6765\u3002\u8fd9\u90e8\u5206\u5b58\u50a8\u7684\u987a\u5e8f\u4f1a\u53d7\u5230\u865a\u62df\u673a\u5206\u914d\u7b56\u7565\u53c2\u6570\u548c\u5b57\u6bb5\u5728Java\u6e90\u7801\u4e2d\u5b9a\u4e49\u987a\u5e8f\u7684\u5f71\u54cd\u3002<\/li>\n<li>\u5bf9\u9f50\u586b\u5145\u4e0d\u662f\u5fc5\u7136\u5b58\u5728\u7684\uff0c\u4e3b\u8981\u662f\u7531\u4e8eHotSpot VM\u7684\u81ea\u52a8\u5185\u5b58\u7ba1\u7406\u7cfb\u7edf\u8981\u6c42\u5bf9\u8c61\u8d77\u59cb\u5730\u5740\u5fc5\u987b\u662f8\u5b57\u8282\u7684\u6574\u6570\u500d\u3002<\/li>\n<\/ul>\n<h4 id=\"\u5bf9\u8c61\u7684\u8bbf\u95ee\u5b9a\u4f4d\">\u5bf9\u8c61\u7684\u8bbf\u95ee\u5b9a\u4f4d<\/h4>\n<ul>\n<li>\u6808\u4e0a\u7684reference\u7c7b\u578b\u5728\u865a\u62df\u673a\u89c4\u8303\u4e2d\u53ea\u89c4\u5b9a\u4e86\u4e00\u4e2a\u6307\u5411\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u5e76\u6ca1\u6709\u5b9a\u4e49\u8fd9\u4e2a\u5f15\u7528\u5e94\u8be5\u901a\u8fc7\u4f55\u79cd\u65b9\u5f0f\u53bb\u5b9a\u4f4d\u3001\u8bbf\u95ee\u5806\u6808\u5bf9\u8c61\u7684\u5177\u4f53\u4f4d\u7f6e\uff0c\u76ee\u524d\u4e3b\u6d41\u7684\u65b9\u5f0f\u65b9\u5f0f\u6709\u53e5\u67c4\u548c\u76f4\u63a5\u76f4\u63a5\u4e24\u79cd\u3002<\/li>\n<li>\u901a\u8fc7\u53e5\u67c4\uff1aJava\u5806\u4e2d\u5212\u51fa\u4e00\u5757\u5185\u5b58\u4f5c\u4e3a\u53e5\u67c4\u6c60\uff0creference\u4e2d\u5b58\u50a8\u7684\u5c31\u662f\u5bf9\u8c61\u7684\u53e5\u67c4\u5730\u5740\uff0c\u800c\u53e5\u67c4\u4e2d\u5305\u542b\u4e86\u5bf9\u8c61\u5b9e\u4f8b\u6570\u636e\u4e0e\u7c7b\u578b\u6570\u636e\u5404\u81ea\u7684\u5177\u4f53\u5730\u5740\u4fe1\u606f\u3002\u5176\u6700\u5927\u597d\u5904\u5c31\u662freference\u5b58\u50a8\u7684\u662f\u7a33\u5b9a\u7684\u53e5\u67c4\u5730\u5740\uff0c\u5728\u5bf9\u8c61\u88ab\u79fb\u5230\uff08\u5783\u573e\u6536\u96c6\u65f6\u79fb\u5230\uff09\u53ea\u6539\u53d8\u5b9e\u4f8b\u6570\u636e\u6307\u9488\uff0c\u800creference\u4e0d\u9700\u8981\u4fee\u6539\uff1b<\/li>\n<\/ul>\n<p><a class=\"fancybox\" href=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/object_access_reference_1.png\" rel=\"group\"><img decoding=\"async\" src=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/object_access_reference_1.png\" alt=\"\u901a\u8fc7\u53e5\u67c4\u8bbf\u95ee\u5bf9\u8c61\" \/><\/a><\/p>\n<ul>\n<li>\u901a\u8fc7\u76f4\u63a5\u6307\u9488\uff1aJava\u5806\u5bf9\u8c61\u7684\u5e03\u5c40\u4e2d\u5fc5\u987b\u8003\u8651\u5982\u679c\u653e\u7f6e\u8bbf\u95ee\u7c7b\u578b\u6570\u636e\u7684\u76f8\u5173\u4fe1\u606f\uff0c\u800creference\u4e2d\u5b58\u5728\u7684\u76f4\u63a5\u5c31\u662f\u5bf9\u8c61\u5730\u5740\u3002\u5176\u6700\u5927\u597d\u5904\u5728\u4e8e\u901f\u5ea6\u66f4\u5feb\uff0c\u8282\u7701\u4e86\u4e00\u6b21\u6307\u9488\u5b9a\u4f4d\u7684\u65f6\u673a\u5f00\u9500\u3002HotSpot\u91c7\u7528\u8be5\u65b9\u5f0f\u8fdb\u884c\u5bf9\u8c61\u8bbf\u95ee\uff0c\u4f46\u5176\u4ed6\u8bed\u8a00\u548c\u6846\u67b6\u91c7\u7528\u53e5\u67c4\u7684\u4e5f\u975e\u5e38\u5e38\u89c1\u3002<\/li>\n<\/ul>\n<p><a class=\"fancybox\" href=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/object_access_reference_2.png\" rel=\"group\"><img decoding=\"async\" src=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/object_access_reference_2.png\" alt=\"\u901a\u8fc7\u76f4\u63a5\u6307\u9488\u8bbf\u95ee\u5bf9\u8c61\" \/><\/a><\/p>\n<h3 id=\"\u5b9e\u6218\uff1aOutOfMemoryError\u5f02\u5e38\">\u5b9e\u6218\uff1aOutOfMemoryError\u5f02\u5e38<\/h3>\n<ul>\n<li>\u901a\u8fc7\u4ee3\u7801\u9a8c\u8bc1Java\u865a\u62df\u673a\u89c4\u8303\u4e2d\u63cf\u8ff0\u5404\u4e2a\u8fd0\u884c\u65f6\u533a\u57df\u5b58\u50a8\u7684\u5185\u5bb9\uff1b<\/li>\n<li>\u5728\u5b9e\u9645\u9047\u5230\u5185\u5b58\u6ea2\u51fa\u5f02\u5e38\u65f6\uff0c\u80fd\u6839\u636e\u5f02\u5e38\u7684\u4fe1\u606f\u5feb\u901f\u5224\u65ad\u662f\u54ea\u4e2a\u533a\u57df\u5185\u5b58\u6ea2\u51fa\uff1b<\/li>\n<\/ul>\n<h4 id=\"Java\u5806\u6ea2\u51fa\">Java\u5806\u6ea2\u51fa<\/h4>\n<p><a class=\"fancybox\" href=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/outofmemory_jvm_heap.png\" rel=\"group\"><img decoding=\"async\" src=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/outofmemory_jvm_heap.png\" alt=\"Java\u5806\u6ea2\u51fa\" \/><\/a><\/p>\n<p>\u89e3\u51b3\u601d\u8def\uff1a\u5148\u901a\u8fc7\u5185\u5b58\u6620\u50cf\u5206\u6790\u5de5\u5177\u5bf9dump\u51fa\u6765\u7684\u5806\u8f6c\u50a8\u5feb\u7167\u8fdb\u884c\u5206\u6790\uff0c\u5148\u5206\u6e05\u695a\u662f\u5185\u5b58\u6cc4\u6f0f\u8fd8\u662f\u5185\u5b58\u6ea2\u51fa\uff1b\u5982\u679c\u662f\u5185\u5b58\u6cc4\u6f0f\uff0c\u8fdb\u4e00\u6b65\u67e5\u770b\u6cc4\u6f0f\u5bf9\u8c61\u5230GC Roots\u7684\u5f15\u7528\u94fe\uff0c\u4ece\u800c\u786e\u8ba4\u4e3a\u4ec0\u4e48\u65e0\u6cd5\u56de\u6536\uff1b\u5982\u679c\u662f\u5185\u5b58\u6ea2\u51fa\uff0c\u5219\u5e94\u5f53\u68c0\u67e5\u865a\u62df\u673a\u5806\u53c2\u6570\uff08-Xmx\u4e0e-Xmx\uff09\u6216\u68c0\u67e5\u662f\u5426\u5b58\u5728\u5bf9\u8c61\u751f\u547d\u5468\u671f\u8fc7\u957f\u3001\u6301\u6709\u72b6\u6001\u65f6\u95f4\u8fc7\u957f\u7684\u60c5\u51b5\uff1b<\/p>\n<h4 id=\"\u865a\u62df\u673a\u6808\u548c\u672c\u5730\u65b9\u6cd5\u6808\u6ea2\u51fa\">\u865a\u62df\u673a\u6808\u548c\u672c\u5730\u65b9\u6cd5\u6808\u6ea2\u51fa<\/h4>\n<ul>\n<li>HotSpot\u4e0d\u533a\u5206\u865a\u62df\u673a\u6808\u548c\u672c\u5730\u65b9\u6cd5\u6808\uff1b<\/li>\n<li>StackOverflowError\u548cOutOfMemoryError\u5b58\u5728\u4e92\u76f8\u91cd\u53e0\u7684\u5730\u65b9\uff1b<\/li>\n<li>\u6808\u5bb9\u91cf\u7531-Xss\u53c2\u6570\u8bbe\u5b9a\uff1b<\/li>\n<\/ul>\n<p><a class=\"fancybox\" href=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/stackoverflow_jvm_stack.png\" rel=\"group\"><img decoding=\"async\" src=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/stackoverflow_jvm_stack.png\" alt=\"\u865a\u62df\u673a\u6808\u6ea2\u51fa\" \/><\/a><\/p>\n<p>\u865a\u62df\u673a\u7684\u9ed8\u8ba4\u53c2\u6570\u5bf9\u4e8e\u901a\u5e38\u7684\u65b9\u6cd5\u8c03\u7528\uff081000~2000\u5c42\uff09\u5b8c\u5168\u591f\u7528\uff0c\u901a\u5e38\u6839\u636e\u5f02\u5e38\u7684\u5806\u6808\u65e5\u5fd7\u5c31\u53ef\u4ee5\u5f88\u5bb9\u6613\u5b9a\u4f4d\u95ee\u9898\u3002<\/p>\n<h4 id=\"\u65b9\u6cd5\u533a\u548c\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u6ea2\u51fa\">\u65b9\u6cd5\u533a\u548c\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u6ea2\u51fa<\/h4>\n<p>\u5bf9\u4e8e\u8fd9\u4e2a\u533a\u57df\u7684\u6d4b\u8bd5\uff0c\u57fa\u672c\u601d\u8def\u662f\u8fd0\u884c\u65f6\u4ea7\u751f\u5927\u91cf\u7684\u7c7b\u53bb\u586b\u6ee1\u65b9\u6cd5\u533a\uff08\u6bd4\u5982\u4f7f\u7528\u53cd\u5c04\u548c\u52a8\u6001\u4ee3\u7406\uff09\uff0c\u8fd9\u91cc\u6211\u4eec\u501f\u52a9CGLib\u76f4\u63a5\u64cd\u4f5c\u5b57\u8282\u7801\u8fd0\u884c\u65f6\u4ea7\u751f\u5927\u91cf\u7684\u52a8\u6001\u7c7b\uff08\u5f88\u5bf9\u4e3b\u6d41\u6846\u67b6\u5982Spring\u3001Hibernate\u90fd\u4f1a\u91c7\u7528\u7c7b\u4f3c\u7684\u5b57\u8282\u7801\u6280\u672f\uff09\u3002\u5728\u8fd9\u91cc\u9700\u8981\u7279\u522b\u6ce8\u610f\u5783\u573e\u56de\u6536\u7684\u72b6\u51b5\u3002<\/p>\n<p><a class=\"fancybox\" href=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/outofmemory_java_methodarea_part1.png\" rel=\"group\"><img decoding=\"async\" src=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/outofmemory_java_methodarea_part1.png\" alt=\"\u501f\u52a9CGLib\u4f7f\u65b9\u6cd5\u533a\u51fa\u73b0\u5185\u5b58\u6ea2\u51fa\u5f02\u5e381\" \/><\/a><br \/>\n<a class=\"fancybox\" href=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/outofmemory_java_methodarea_part2.png\" rel=\"group\"><img decoding=\"async\" src=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/outofmemory_java_methodarea_part2.png\" alt=\"\u501f\u52a9CGLib\u4f7f\u65b9\u6cd5\u533a\u51fa\u73b0\u5185\u5b58\u6ea2\u51fa\u5f02\u5e382\" \/><\/a><\/p>\n<h4 id=\"\u672c\u673a\u76f4\u63a5\u5185\u5b58\u6ea2\u51fa\">\u672c\u673a\u76f4\u63a5\u5185\u5b58\u6ea2\u51fa<\/h4>\n<p><a class=\"fancybox\" href=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/outofmemory_jvm_direct.png\" rel=\"group\"><img decoding=\"async\" src=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/outofmemory_jvm_direct.png\" alt=\"\u672c\u673a\u76f4\u63a5\u5185\u5b58\u6ea2\u51fa1\" \/><\/a><br \/>\n<a class=\"fancybox\" href=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/outofmemory_jvm_direct_part2.png\" rel=\"group\"><img decoding=\"async\" src=\"http:\/\/oi46mo3on.bkt.clouddn.com\/10_deep_in_jvm\/outofmemory_jvm_direct_part2.png\" alt=\"\u672c\u673a\u76f4\u63a5\u5185\u5b58\u6ea2\u51fa2\" \/><\/a><\/p>\n<p>DirectMemory\u5bfc\u81f4\u7684\u5185\u5b58\u6ea2\u51fa\uff0c\u5728Heap Dump\u91cc\u4e0d\u4f1a\u770b\u89c1\u660e\u663e\u7684\u5f02\u5e38\u3002\u5982\u679c\u53d1\u73b0OouOfMemory\u4e4b\u540eDump\u6587\u4ef6\u5f88\u5c0f\uff0c\u7a0b\u5e8f\u53c8\u4f7f\u7528\u4e86NIO\uff0c\u90a3\u5c31\u53ef\u4ee5\u68c0\u67e5\u4e0b\u662f\u5426\u8fd9\u65b9\u9762\u7684\u539f\u56e0\u3002<\/p>\n<h3 id=\"\u672c\u7ae0\u5c0f\u7ed3-1\">\u672c\u7ae0\u5c0f\u7ed3<\/h3>\n<p>\u5b66\u4e60\u4e86\u865a\u62df\u673a\u7684\u5185\u5b58\u662f\u5982\u4f55\u5212\u5206\u7684\uff0c\u5bf9\u8c61\u662f\u5982\u4f55\u521b\u5efa\u3001\u5e03\u5c40\u548c\u8bbf\u95ee\u7684\uff0c\u54ea\u90e8\u5206\u533a\u57df\u3001\u4ec0\u4e48\u6837\u7684\u4ee3\u7801\u548c\u64cd\u4f5c\u53ef\u80fd\u5bfc\u81f4\u5185\u5b58\u7684\u6ea2\u51fa\u5f02\u5e38\u3002<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u300a\u6df1\u5165\u7406\u89e3Java\u865a\u62df\u673a\u300b\u8bfb\u4e66\u7b14\u8bb01\uff1aJava\u6280\u672f\u4f53\u7cfb\u3001Java\u5185\u5b58\u533a\u57df\u548c\u5185\u5b58\u6ea2\u51fa\u5f02\u5e38 \u56fd\u5185JVM\u76f8\u5173\u4e66\u7c4dNO\u2026 <span class=\"read-more\"><a href=\"http:\/\/rain1024.com\/index.php\/2018\/07\/27\/article130\/\">Read More &raquo;<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31],"tags":[51],"class_list":["post-969","post","type-post","status-publish","format-standard","hentry","category-java","tag-jvm"],"_links":{"self":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts\/969","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/comments?post=969"}],"version-history":[{"count":1,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts\/969\/revisions"}],"predecessor-version":[{"id":1403,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts\/969\/revisions\/1403"}],"wp:attachment":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/media?parent=969"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/categories?post=969"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/tags?post=969"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}