{"id":10006420,"date":"2022-09-06T21:43:16","date_gmt":"2022-09-06T13:43:16","guid":{"rendered":"https:\/\/ityet.com\/?p=10006420"},"modified":"2022-09-06T21:43:16","modified_gmt":"2022-09-06T13:43:16","slug":"java%e5%ba%94%e7%94%a8%e6%8f%90%e9%80%9f%e9%80%9f%e5%ba%a6%e4%b8%8e%e6%bf%80%e6%83%85","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006420","title":{"rendered":"java\u5e94\u7528\u63d0\u901f(\u901f\u5ea6\u4e0e\u6fc0\u60c5)"},"content":{"rendered":"<p>\u7b80\u4ecb\uff1a\u00a0\u672c\u6587\u5c06\u9610\u8ff0\u901a\u8fc7\u57fa\u7840\u8bbe\u65bd\u4e0e\u5de5\u5177\u7684\u6539\u8fdb\uff0c\u5b9e\u73b0\u4ece\u6784\u5efa\u5230\u542f\u52a8\u5168\u65b9\u9762\u5927\u5e45\u63d0\u901f\u7684\u5b9e\u8df5\u548c\u7406\u8bba\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441283\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u4f5c\u8005 | 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project\u6d4b\u8bd5\uff0c\u7528maven\u898120\u5206\u949f\u5de6\u53f3\uff0c\u800c\u7528amaven3.5.0\u57283\u5206\u949f\u5de6\u53f3\uff0c\u5728\u547d\u4e2d\u7f13\u5b58\u60c5\u51b5\u4e0b\u6700\u4f73\u80fd\u52301\u5206\u949f\u5185\u3002\u7b80\u5355\u56db\u6b65\u540e\uff0c\u6211\u4eec\u5c31\u4e0d\u7528\u518d\u5f53\u201c\u76f2\u4fa0\u201d\u4e86\uff0c\u5728\u672c\u5730\u53ef\u4ee5\u6d41\u7545\u5730\u7f16\u7801\u4e0e\u8dd1\u5355\u5143\u6d4b\u8bd5\u3002\u9664\u4e86\u5728IDEA\u4e2d\u4f7f\u7528amaven\u7684\u4f9d\u8d56\u5206\u6790\u80fd\u529b\u5916\uff0c\u5728\u672c\u5730\u901a\u8fc7\u547d\u4ee4\u884c\u6765\u8fd0\u884cmvn compile\u6216dependency:tree\uff0c\u4e5f\u5b8c\u5168\u517c\u5bb9apache-maven\u7684\u30023.3 \u539f\u7406IDEA\u662f\u5982\u4f55\u8c03\u7528maven\u7684\u4f9d\u8d56\u5206\u6790\u65b9\u6cd5\u7684\uff1f\u5728IDEA\u7684\u6e90\u7801\u6587\u4ef6[2]\u4e2d979\u884c\uff0c\u8c03\u7528\u4e86dependencyResolver.resolve(resolution)\u65b9\u6cd5\uff1a\u00a0<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441296\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u00a0dependencyResolver\u5c31\u662f\u901a\u8fc7maven home path\u6307\u5b9a\u7684maven\u76ee\u5f55\u4e2d\u7684DefaultProjectDependenciesResolver.java\u3002\u00a0<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441297\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u00a0\u800cDefaultProjectDependenciesResolver.resolve()\u65b9\u6cd5\u5c31\u662f\u4f9d\u8d56\u5206\u6790\u7684\u5165\u53e3\u3002IDEA\u4e3b\u8981\u7528\u4e86maven\u7684\u4f9d\u8d56\u5206\u6790\u7684\u80fd\u529b\uff0c\u5728 \u201cmaven\u6784\u5efa\u63d0\u901f\u201d\u8fd9\u4e00\u5c0f\u8282\u4e2d\uff0c 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cache\uff0c\u800c\u4e0d\u7528\u771f\u6b63\u8bfb\u78c1\u76d8\u3002\u00a0<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441299\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u00a0\u4e2d\u5fc3OSS\u670d\u52a1\u603b\u5171\u53ea\u80fd\u63d0\u4f9b\u6700\u591a20G\u7684\u5e26\u5bbd\uff0c\u4ece\u5386\u53f2\u62c9\u955c\u50cf\u6570\u636e\u80fd\u770b\u5230\u6bcf\u4e2a\u8282\u70b9\u7684\u4e0b\u8f7d\u901f\u5ea6\u90fd\u5f88\u96be\u8d85\u8fc730M\uff0c\u4f46\u662f\u6211\u4eec\u73b0\u5728\u6bcf\u4e2a\u8282\u70b9\u90fd\u662f50G\u7f51\u7edc\uff0c\u8282\u70b9\u76f8\u4e92\u4e4b\u95f4\u5171\u4eab\u955c\u50cf\u5c42\u6570\u636e\u53ef\u4ee5\u5145\u5206\u5229\u7528\u5230\u8282\u70b9\u672c\u5730\u768450G\u7f51\u7edc\u5e26\u5bbd\uff0c\u5f53\u7136\u4e3a\u4e86\u4e0d\u5f71\u54cd\u5176\u5b83\u670d\u52a1\uff0c\u6211\u4eec\u628a\u955c\u50cf\u5171\u4eab\u7684\u5e26\u5bbd\u63a7\u5236\u5728200M\u4ee5\u4e0b\u30024.2.5 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v2[7])\u3002\u76ee\u524dCDS\u5728\u963f\u91cc\u7684\u843d\u5730\u60c5\u51b5\uff1a\u70ed\u70b9\u5e94\u7528A\u4f7f\u7528CDS\u51cf\u5c11\u4e8610\u79d2\u542f\u52a8\u65f6\u95f4\u4e91\u4ea7\u54c1SAE\u548cFC\u5728\u4f7f\u7528Dragonwell11\u65f6\u5f00\u542fCDS\u3001AOT\u7b49\u7279\u6027\u52a0\u901f\u542f\u52a8\u7ecf\u8fc7\u5341\u5e74\u7684\u53d1\u5c55\uff0cCDS\u5df2\u7ecf\u53d1\u5c55\u4e3a\u4e00\u9879\u6210\u719f\u7684\u6280\u672f\u3002\u4f46\u662f\u5f88\u5bb9\u6613\u4ee4\u4eba\u4e0d\u89e3\u7684\u662fCDS\u4e0d\u7ba1\u5728\u963f\u91cc\u7684\u4e1a\u52a1\u8fd8\u662f\u4e1a\u754c(\u5373\u4fbf\u662fAWS Lambda)\u90fd\u6ca1\u80fd\u88ab\u5927\u89c4\u6a21\u4f7f\u7528\u3002\u5173\u952e\u539f\u56e0\u6709\u4e24\u4e2a:5.1.1.1 AppCDS\u5728\u5b9e\u8df5\u4e2d\u6548\u679c\u4e0d\u660e\u663ejsa\u4e2d\u5b58\u50a8\u7684InstanceKlass\u662f\u5bf9class\u6587\u4ef6\u89e3\u6790\u7684\u4ea7\u7269\u3002\u5bf9\u4e8eboot classloader(\u52a0\u8f7djre\/lib\/rt.jar\u4e0b\u9762\u7684\u7c7b\u7684\u7c7b\u52a0\u8f7d\u5668)\u548csystem(app) \u7c7b\u52a0\u8f7d\u5668(\u52a0\u8f7d-classpath\u4e0b\u9762\u7684\u7c7b\u7684\u7c7b\u52a0\u8f7d\u5668)\uff0cCDS\u6709\u5185\u90e8\u673a\u5236\u53ef\u4ee5\u8df3\u8fc7\u5bf9class\u6587\u4ef6\u7684\u8bfb\u53d6\uff0c\u4ec5\u4ec5\u901a\u8fc7\u7c7b\u540d\u5728jsa\u6587\u4ef6\u4e2d\u5339\u914d\u5bf9\u5e94\u7684\u6570\u636e\u7ed3\u6784\u3002Java\u8bed\u8a00\u8fd8\u63d0\u4f9b\u7528\u6237\u81ea\u5b9a\u4e49\u7c7b\u52a0\u8f7d\u5668(custom class loader)\u7684\u673a\u5236\uff0c\u7528\u6237\u901a\u8fc7Override\u81ea\u5df1\u7684 Classloader.loadClass() \u67e5\u627e\u7c7b\uff0cAppCDS \u5728\u4e3acustomer class loade\u65f6\u52a0\u8f7d\u7c7b\u662f\u9700\u8981\u7ecf\u8fc7\u5982\u4e0b\u6b65\u9aa4:\u8c03\u7528\u7528\u6237\u5b9a\u4e49\u7684Classloader.loadClass()\uff0c\u62ff\u5230class byte stream\u8ba1\u7b97class byte stream\u7684checksum\uff0c\u4e0ejsa\u4e2d\u7684\u540c\u7c7b\u540d\u7ed3\u6784\u7684checksum\u6bd4\u8f83\u5982\u679c\u5339\u914d\u6210\u529f\u5219\u8fd4\u56dejsa\u4e2d\u7684InstanceKlass\uff0c\u5426\u5219\u7ee7\u7eed\u4f7f\u7528slow path\u89e3\u6790class\u6587\u4ef65.1.1.2 \u5de5\u7a0b\u5b9e\u8df5\u4e0d\u53cb\u597d\u4f7f\u7528AppCDS\u9700\u8981\u5982\u4e0b\u6b65\u9aa4:\u9488\u5bf9\u5f53\u524d\u7248\u672c\u5728\u751f\u4ea7\u73af\u5883\u542f\u52a8\u5e94\u7528\uff0c\u6536\u96c6profiling\u4fe1\u606f\u57fa\u4e8eprofiling\u4fe1\u606f\u751f\u6210jsa(java shared archive) dump\u5c06jsa\u6587\u4ef6\u548c\u5e94\u7528\u672c\u8eab\u6253\u5305\u5728\u4e00\u8d77\uff0c\u53d1\u5e03\u5230\u751f\u4ea7\u73af\u5883\u7531\u4e8e\u8fd9\u79cdtrace-replay\u6a21\u5f0f\u7684\u590d\u6742\u6027\uff0c\u5728SAE\u548cFC\u4e91\u4ea7\u54c1\u7684\u843d\u5730\u90fd\u662f\u901a\u8fc7\u53d1\u5e03\u6d41\u7a0b\u7684\u5b9a\u5236\u4ee5\u53ca\u5f00\u53d1\u590d\u6742\u7684\u547d\u4ee4\u884c\u5de5\u5177\u6765\u89e3\u51b3\u7684\u30025.1.2 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referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441301\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u00a0\u57fa\u4e8e\u8fd9\u4e2a\u7ed3\u6784\uff0c\u8bf8\u5982 o instanceof String \u8fd9\u6837\u7684\u8868\u8fbe\u5f0f\u5c31\u53ef\u4ee5\u6709\u8db3\u591f\u7684\u4fe1\u606f\u5224\u65ad\u4e86\u3002\u8981\u6ce8\u610f\u7684\u662fInstanceKlass\u7ed3\u6784\u6bd4\u8f83\u590d\u6742\uff0c\u5305\u542b\u4e86\u7c7b\u7684\u6240\u6709\u65b9\u6cd5\u3001field\u7b49\u7b49\uff0c\u65b9\u6cd5\u53c8\u5305\u542b\u4e86\u5b57\u8282\u7801\u7b49\u4fe1\u606f\u3002\u8fd9\u4e2a\u6570\u636e\u7ed3\u6784\u662f\u901a\u8fc7\u8fd0\u884c\u65f6\u89e3\u6790class\u6587\u4ef6\u83b7\u5f97\u7684\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u5b89\u5168\u6027\uff0c\u89e3\u6790class\u65f6\u8fd8\u9700\u8981\u6821\u9a8c\u5b57\u8282\u7801\u7684\u5408\u6cd5\u6027(\u975e\u901a\u8fc7javac\u4ea7\u751f\u7684\u65b9\u6cd5\u5b57\u8282\u7801\u5f88\u5bb9\u6613\u5f15\u8d77jvm 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src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441302\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u00a05.1.3.1 Alibaba Dragonwell\u5bf9AppCDS\u7684\u4f18\u5316\u4e0a\u8ff0AppCDS for custom classloader\u7684\u52a0\u8f7d\u6d41\u7a0b\u66f4\u52a0\u590d\u6742\u7684\u539f\u56e0\u662fJVM\u901a\u8fc7(classloader, className)\u4e8c\u5143\u7ec4\u6765\u552f\u4e00\u786e\u5b9a\u4e00\u4e2a\u7c7b\u3002\u5bf9\u4e8eBootClassloader\u3001AppClassloader\u5728\u6bcf\u6b21\u8fd0\u884c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u56e0\u6b64\u53ef\u4ee5\u5728\u591a\u6b21\u8fd0\u884c\u4e4b\u95f4\u786e\u5b9a\u552f\u4e00\u7684\u8eab\u4efd\u5bf9\u4e8ecustomClassloader\u9664\u4e86\u7c7b\u578b\uff0c\u5e76\u6ca1\u6709\u660e\u663e\u7684\u552f\u4e00\u6807\u8bc6\u3002AppCDS\u56e0\u6b64\u65e0\u6cd5\u5728\u52a0\u8f7d\u7c7b\u9636\u6bb5\u901a\u8fc7classloader\u5bf9\u8c61\u548c\u7c7b\u578b\u53bbshared 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title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u00a0\u8fd9\u4e9b\u7279\u6027\u5c31\u662f\u4e3a\u4e86\u6309\u9700\u52a0\u8f7d\uff08\u61d2\u52a0\u8f7d\uff09\uff0c\u904d\u5386\u7684\u8fc7\u7a0b\u662fO(N)\u7684\u590d\u6742\u5ea6\uff0c\u6309\u987a\u5e8f\u4ece\u5934\u5230\u5c3e\u7684\u904d\u5386\uff0c\u800c\u4e14\u904d\u5386\u8fc7\u7a0b\u53ef\u80fd\u4f1a\u4f34\u968f\u7740URL\u7684\u6253\u5f00\uff0c\u548c\u65b0URL\u7684\u5f15\u5165\uff0c\u6240\u4ee5\uff0c\u968f\u7740jar\u5305\u6570\u91cf\u7684\u589e\u591a\uff0c\u6bcf\u6b21loadClass\u6216\u8005findResources\u7684\u8017\u65f6\u4f1a\u7ebf\u6027\u589e\u957f\uff0c\u8c03\u7528\u6b21\u6570\u4e5f\u4f1a\u589e\u957f\uff08\u52a0\u8f7d\u7684\u7c7b\u4e5f\u53d8\u591a\u4e86\uff09\uff0c\u542f\u52a8\u5c31\u6162\u4e0b\u53bb\u4e86\u3002\u6162\u7684\u53e6\u4e00\u4e2a\u6b21\u8981\u539f\u56e0\u662f\uff0cgetLoader(int index)\u52a0\u4e86\u4e24\u628a\u9501\u30026.4.2 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Dubbo3 \u542f\u52a8\u4f18\u53167.1.1 \u73b0\u72b6Dubbo3 \u4f5c\u4e3a\u963f\u91cc\u5df4\u5df4\u4f7f\u7528\u6700\u4e3a\u5e7f\u6cdb\u7684\u5206\u5e03\u5f0f\u670d\u52a1\u6846\u67b6\uff0c\u670d\u52a1\u96c6\u56e2\u5185\u6570\u4e07\u4e2a\u5e94\u7528\uff0c\u5b83\u7684\u91cd\u8981\u6027\u81ea\u7136\u4e0d\u8a00\u800c\u55bb\uff1b\u4f46\u662f\u968f\u7740\u4e1a\u52a1\u7684\u53d1\u5c55\uff0c\u5e94\u7528\u4f9d\u8d56\u7684 Jar \u5305 \u548c HSF \u670d\u52a1\u4e5f\u53d8\u5f97\u8d8a\u6765\u8d8a\u591a\uff0c\u5bfc\u81f4\u5e94\u7528\u542f\u52a8\u901f\u5ea6\u53d8\u5f97\u8d8a\u6765\u8d8a\u6162\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u5c06\u770b\u4e00\u4e0b Dubbo3 \u5982\u4f55\u4f18\u5316\u542f\u52a8\u901f\u5ea6\u30027.1.2 Dubbo3 \u4e3a\u4ec0\u4e48\u4f1a\u6162Dubbo3 \u4f5c\u4e3a\u4e00\u4e2a\u4f18\u79c0\u7684 RPC \u670d\u52a1\u6846\u67b6\uff0c\u5f53\u7136\u80fd\u591f\u8ba9\u7528\u6237\u80fd\u591f\u8fdb\u884c\u7075\u6d3b\u6269\u5c55\uff0c\u56e0\u6b64 Dubbo3 \u6846\u67b6\u63d0\u4f9b\u5404\u79cd\u5404\u6837\u7684\u6269\u5c55\u70b9\u4e00\u5171 200+ \u4e2a\u3002Dubbo3 \u7684\u6269\u5c55\u70b9\u673a\u5236\u6709\u70b9\u7c7b\u4f3c JAVA \u6807\u51c6\u7684 SPI \u673a\u5236\uff0c\u4f46\u662f Dubbo3 \u8bbe\u7f6e\u4e86 3 \u4e2a\u4e0d\u540c\u7684\u52a0\u8f7d\u8def\u5f84\uff0c\u5177\u4f53\u7684\u52a0\u8f7d\u8def\u5f84\u5982\u4e0b\uff1a\u00a0<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441306\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u00a0\u4e5f\u5c31\u662f\u8bf4\uff0c\u4e00\u4e2a SPI \u7684\u52a0\u8f7d\uff0c\u4e00\u4e2a ClassLoader \u5c31\u9700\u8981\u626b\u63cf\u8fd9\u4e2a ClassLoader \u4e0b\u6240\u6709\u7684 Jar \u5305 3 \u6b21\u3002\u4ee5 \u70ed\u70b9\u5e94\u7528A\u4e3a\u4f8b\uff0c\u603b\u7684\u4e1a\u52a1 Bundle ClassLoader \u6570\u8fbe\u5230 582 \u4e2a\u5de6\u53f3\uff0c\u90a3\u4e48\u6240\u6709\u7684 SPI \u52a0\u8f7d\u9700\u8981\u7684\u6b21\u6570\u4e3a: 200(spi)\u00a03(\u8def\u5f84)\u00a0582(classloader) = 349200\u6b21\u3002\u53ef\u4ee5\u770b\u5230\u626b\u63cf\u6b21\u6570\u63a5\u8fd1 35\u4e07 \u6b21! \u5e76\u4e14\u6574\u4e2a\u8fc7\u7a0b\u662f\u4e32\u884c\u626b\u63cf\u7684\uff0c\u800c\u6211\u4eec\u77e5\u9053 java.lang.ClassLoader#getResources \u662f\u4e00\u4e2a\u6bd4\u8f83\u8017\u65f6\u7684\u64cd\u4f5c\uff0c\u56e0\u6b64\u6574\u4e2a SPI \u52a0\u8f7d\u8fc7\u7a0b\u8017\u65f6\u662f\u975e\u5e38\u4e45\u7684\u30027.1.3 SPI \u52a0\u8f7d\u6162\u7684\u89e3\u51b3\u65b9\u6cd5\u7531\u6211\u4eec\u524d\u9762\u7684\u5206\u6790\u53ef\u4ee5\u77e5\u9053\uff0c\u8981\u60f3\u51cf\u5c11\u8017\u65f6\uff0c\u7b2c\u4e00\u662f\u9700\u8981\u51cf\u5c11 SPI \u626b\u63cf\u7684\u6b21\u6570\uff0c\u7b2c\u4e8c\u662f\u63d0\u5347\u5e76\u53d1\u5ea6\uff0c\u51cf\u5c11\u65e0\u6548\u7b49\u5f85\u65f6\u95f4\u3002\u7b2c\u4e00\u4e2a\u51cf\u5c11 SPI \u626b\u63cf\u7684\u6b21\u6570\uff0c\u6211\u4eec\u7ecf\u8fc7\u5206\u6790\u5f97\u77e5\uff0c\u5728\u6574\u4e2a\u96c6\u56e2\u7684\u4e1a\u52a1\u5e94\u7528\u4e2d\uff0c\u4f7f\u7528\u5230\u7684 SPI \u96c6\u4e2d\u5728\u4e0d\u5230 10 \u4e2a SPI\uff0c\u56e0\u6b64\u6211\u4eec\u758f\u7406\u51fa\u4e00\u4e2a SPI \u5217\u8868\uff0c\u5728\u8fd9\u4e2a SPI \u5217\u8868\u4e2d\uff0c\u9ed8\u8ba4\u53ea\u4ece Dubbo3 \u6846\u67b6\u6240\u5728 ClassLoader \u7684\u9650\u5b9a\u76ee\u5f55\u52a0\u8f7d\uff0c\u8fd9\u6837\u5927\u5927\u4e0b\u964d\u4e86\u626b\u63cf\u6b21\u6570\uff0c\u4f7f\u70ed\u70b9\u5e94\u7528A\u603b\u626b\u63cf\u8ba1\u6570\u4e0b\u964d\u5230\u4e0d\u5230 2\u4e07 \u6b21\uff0c\u5360\u539f\u6765\u7684\u6b21\u6570 5% \u8fd9\u6837\u3002\u7b2c\u4e8c\u4e2a\u63d0\u5347\u4e86\u5bf9\u591a\u4e2a ClassLoader \u626b\u63cf\u7684\u6548\u7387\uff0c\u91c7\u7528\u5e76\u53d1\u7ebf\u7a0b\u6c60\u7684\u65b9\u5f0f\u6765\u51cf\u5c11\u7b49\u5f85\u7684\u65f6\u95f4\uff0c\u5177\u4f53\u4ee3\u7801\u5982\u4e0b\uff1a\u00a0<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441307\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u00a07.1.4 \u5176\u4ed6\u4f18\u5316\u624b\u6bb51\u3001\u53bb\u9664\u542f\u52a8\u5173\u952e\u94fe\u8def\u7684\u975e\u5fc5\u8981\u540c\u6b65\u8017\u65f6\u52a8\u4f5c\uff0c\u8f6c\u6210\u5f02\u6b65\u540e\u53f0\u5904\u7406\u30022\u3001\u7f13\u5b58\u542f\u52a8\u8fc7\u7a0b\u4e2d\u67e5\u8be2\u7b2c\u4e09\u65b9\u53ef\u7f13\u5b58\u7684\u7ed3\u679c\uff0c\u53cd\u590d\u91cd\u590d\u4f7f\u7528\u30027.1.5 \u4f18\u5316\u7ed3\u679c\u70ed\u70b9\u5e94\u7528A\u542f\u52a8\u65f6\u95f4\u4ece 603\u79d2 \u4e0b\u964d\u5230 220\u79d2\uff0c\u603b\u4f53\u65f6\u95f4\u4e0b\u964d\u4e86 383\u79d2 =&gt; 603\u79d2 \u4e0b\u964d\u5230 220\u79d2\uff0c\u603b\u4f53\u65f6\u95f4\u4e0b\u964d\u4e86 383\u79d2\u30027.2 TairClient \u542f\u52a8\u4f18\u5316\u80cc\u666f\u4ecb\u7ecd\uff1a1\u3001tair\uff1a\u963f\u91cc\u5df4\u5df4\u5185\u90e8\u7684\u7f13\u5b58\u670d\u52a1\uff0c\u7c7b\u4f3c\u4e8e\u516c\u6709\u4e91\u7684redis\uff1b2\u3001diamond\uff1a\u963f\u91cc\u5df4\u5df4\u5185\u90e8\u914d\u7f6e\u4e2d\u5fc3\uff0c\u76ee\u524d\u5df2\u7ecf\u5347\u7ea7\u6210MSE\uff0c\u548c\u516c\u6709\u4e91\u4e00\u6837\u7684\u4e2d\u95f4\u4ef6\u4ea7\u54c17.2.1 \u73b0\u72b6\u76ee\u524d\u4e2d\u53f0\u57fa\u7840\u670d\u52a1\u4f7f\u7528\u7684tair\u96c6\u7fa4\u5747\u4f7f\u7528\u72ec\u7acb\u96c6\u7fa4\uff0c\u72ec\u7acb\u96c6\u7fa4\u4e2d\u4f7f\u7528\u591a\u4e2aNS\uff08\u547d\u540d\u7a7a\u95f4\uff09\u6765\u533a\u5206\u4e0d\u540c\u7684\u4e1a\u52a1\u57df\uff0c\u540c\u65f6\u90e8\u5206\u5c0f\u7684\u4e1a\u52a1\u4e5f\u4f1a\u548c\u5176\u4ed6\u4e1a\u52a1\u5171\u4eab\u4e00\u4e2a\u516c\u5171\u96c6\u7fa4\u5185\u5355\u4e2aNS\u3002\u65e9\u671ftair\u7684\u96c6\u7fa4\u662f\u901a\u8fc7configID\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u540e\u6765\u4e3a\u4e86\u5bb9\u707e\u53ca\u8bbe\u8ba1\u4e0a\u7684\u8003\u8651\uff0c\u8c03\u6574\u4e3a\u4f7f\u7528username\u8fdb\u884c\u521d\u59cb\u5316\u8bbf\u95ee\uff0c\u4f46username\u5185\u90e8\u8fd8\u662f\u4f1a\u4f7f\u7528configid\u6765\u786e\u5b9a\u9700\u8981\u94fe\u63a5\u7684\u96c6\u7fa4\u3002\u6574\u4e2atair\u521d\u59cb\u5316\u8fc7\u7a0b\u4e2d\u8bfb\u53d6\u7684diamond\u914d\u7f6e\u7684\u6d41\u7a0b\u5982\u4e0b\uff1a1\u3001\u6839\u636euserName\u83b7\u53d6\u914d\u7f6e\u4fe1\u606f\uff0c\u4ece\u914d\u7f6e\u4fe1\u606f\u4e2d\u53ef\u4ee5\u83b7\u5f97TairConfigId\u4fe1\u606f\uff0c\u7528\u4e8e\u6807\u8bc6\u6240\u5728\u96c6\u7fa4dataid\uff1aocs.userinfo.{username}group : DEFAULT_GROUP\u00a0<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441308\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u00a02\u3001\u6839\u636eConfigId\u4fe1\u606f\uff0c\u83b7\u53d6\u5f53\u524dtair\u7684\u8def\u7531\u89c4\u5219\uff0c\u89c4\u5b9a\u67d0\u4e00\u4e2a\u673a\u623f\u4f1a\u8bbf\u95ee\u7684\u96c6\u7fa4\u4fe1\u606f\u3002dataId: {tairConfigId}group : {tairConfigId}.TGROUP\u901a\u8fc7\u8be5\u914d\u7f6e\u53ef\u4ee5\u786e\u5b9a\u5f53\u524d\u673a\u623f\u4f1a\u8bbf\u95ee\u7684\u76ee\u6807\u96c6\u7fa4\u914d\u7f6e\uff0c\u4ee5\u673a\u623fA\u4e3a\u4f8b\uff0c\u5bf9\u5e94\u7684\u914d\u7f6e\u96c6\u7fa4tair.mdb.mc.XXX.\u673a\u623fA\u00a0<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441309\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u00a03\u3001\u83b7\u53d6\u5bf9\u5e94\u96c6\u7fa4\u7684\u4fe1\u606f\uff0c\u786e\u5b9atair\u96c6\u7fa4\u7684cs\u5217\u8868dataid\uff1a{tairConfigId} \/\/ tair.mdb.mc.uicgroup : {tairClusterConfig} \/\/ tair.mdb.mc.uic.\u673a\u623fA\u00a0<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441310\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u00a0\u4ece\u4e0a\u9762\u7684\u5206\u6790\u6765\u770b\uff0c\u5728\u6bcf\u6b21\u521d\u59cb\u5316\u7684\u8fc7\u7a0b\u4e2d\uff0c\u90fd\u4f1a\u8bbf\u95ee\u76f8\u540c\u7684diamond\u914d\u7f6e\uff0c\u5728\u521d\u59cb\u5316\u591a\u4e2a\u540c\u96c6\u7fa4\u7684namespace\u7684\u65f6\u5019\uff0c\u90e8\u5206\u5173\u952e\u914d\u7f6e\u5c31\u4f1a\u591a\u6b21\u8bbf\u95ee\u3002\u4f46\u5b9e\u9645\u8fd9\u90e8\u5206diamond\u914d\u7f6e\u7684\u6570\u636e\u672c\u8eab\u662f\u5b8c\u5168\u4e00\u81f4\u3002\u7531\u4e8ediamond\u672c\u8eab\u4e3a\u4e86\u4fdd\u62a4\u81ea\u8eab\u7684\u7a33\u5b9a\u6027\uff0c\u5728\u5ba2\u6237\u7aef\u5bf9\u8bbf\u95ee\u5355\u4e2a\u914d\u7f6e\u7684\u9891\u7387\u505a\u4e86\u63a7\u5236\uff0c\u8d85\u8fc7\u4e00\u5b9a\u7684\u9891\u7387\u4f1a\u8fdb\u5165\u7b49\u5f85\u8d85\u65f6\u9636\u6bb5\uff0c\u8fd9\u4e00\u90e8\u5206\u5bfc\u81f4\u4e86\u5e94\u7528\u7684\u542f\u52a8\u5ef6\u8fdf\u3002\u5728\u4e00\u5206\u949f\u7684\u65f6\u95f4\u7a97\u53e3\u5185\uff0c\u9650\u5236\u5355\u4e2adiamond\u914d\u7f6e\u7684\u8bbf\u95ee\u6b21\u6570\u4f4e\u4e8e-DlimitTime\u914d\u7f6e\uff0c\u9ed8\u8ba4\u914d\u7f6e\u4e3a5\uff0c\u5bf9\u4e8e\u8d85\u8fc7\u9650\u5236\u7684\u914d\u7f6e\u4f1a\u8fdb\u5165\u7b49\u5f85\u72b6\u6001\u3002\u00a0<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441311\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u00a07.2.2 \u4f18\u5316\u65b9\u6848tair\u5ba2\u6237\u7aef\u8fdb\u884c\u6539\u9020\uff0c\u542f\u52a8\u8fc7\u7a0b\u4e2d\uff0c\u5bf9Diamond\u7684\u914d\u7f6e\u6570\u636e\u505a\u7f13\u5b58\uff0c\u914d\u7f6e\u76d1\u542c\u5668\u7ef4\u62a4\u7f13\u5b58\u7684\u6570\u636e\u4e00\u81f4\u6027\uff0ctair\u5ba2\u6237\u7aef\u542f\u52a8\u65f6\uff0c\u4f18\u5148\u4ece\u7f13\u5b58\u4e2d\u83b7\u53d6\u914d\u7f6e\uff0c\u5f53\u7f13\u5b58\u83b7\u53d6\u4e0d\u5230\u65f6\uff0c\u518d\u91cd\u65b0\u914d\u7f6eDiamond\u914d\u7f6e\u76d1\u542c\u53ca\u83b7\u53d6Diamond\u914d\u7f6e\u4fe1\u606f\u30027.3 SwitchCenter \u542f\u52a8\u4f18\u5316\u80cc\u666f\u4ecb\u7ecd\uff1aSwitchCenter\uff1a\u963f\u91cc\u5df4\u5df4\u96c6\u56e2\u5185\u90e8\u7684\u5f00\u5173\u5e73\u53f0\uff0c\u5bf9\u5e94\u963f\u91cc\u4e91AHAS\u4e91\u4ea7\u54c1[8]7.3.1 \u73b0\u72b6All methods add synchronized made this class to be thread safe. switch op is not frequent, so don&#8217;t care about performance here.\u8fd9\u662fswitch\u6e90\u7801\u91cc\u5b58\u653e\u5404\u4e2aswitch bean \u7684SwitchContainer\u4e2d\u7684\u6ce8\u91ca\uff0c\u53ef\u89c1\u5f53\u65f6\u7684\u4f5c\u8005\u8ba4\u4e3aswitch bean\u53ea\u9700\u521d\u59cb\u5316\u4e00\u6b21\uff0c\u672c\u8eab\u5bf9\u6027\u80fd\u7684\u5f71\u54cd\u4e0d\u5927\u3002\u4f46\u6ca1\u6709\u9884\u6599\u5230\u968f\u7740\u4e1a\u52a1\u7684\u589e\u957f\uff0cswitch bean\u7684\u521d\u59cb\u5316\u53ef\u80fd\u4f1a\u6210\u4e3a\u5e94\u7528\u542f\u52a8\u7684\u74f6\u9888\u3002\u4e1a\u52a1\u5e73\u53f0\u7684\u5b9a\u4f4d\u5bfc\u81f4\u4e86\u5e73\u53f0\u542f\u52a8\u671f\u95f4\u6709\u5927\u91cf\u4e1a\u52a1\u5bb9\u5668\u521d\u59cb\u5316\uff0c\u7531\u4e8eswitch\u4e2d\u95f4\u4ef6\u7684\u5927\u90e8\u5206\u65b9\u6cd5\u5168\u90e8\u88absynchronized\u4fee\u9970\uff0c\u56e0\u6b64\u6240\u6709\u5e94\u7528\u5bb9\u5668\u521d\u59cb\u5316\u5230\u4e86\u52a0\u8f7d\u5f00\u5173\u914d\u7f6e\u65f6(\u5165\u53e3\u4e3acom.taobao.csp.switchcenter.core.SwitchManager#init())\u5c31\u9700\u8981\u4e32\u884c\u6267\u884c\uff0c\u4e25\u91cd\u5f71\u54cd\u542f\u52a8\u901f\u5ea6\u30027.3.2 \u89e3\u51b3\u65b9\u6848\u53bb\u9664\u4e86\u5173\u952e\u8def\u5f84\u4e0a\u7684\u6240\u6709\u9501\u30027.3.3 \u539f\u7406\u672c\u6b21\u5347\u7ea7\u5c06\u5b58\u653e\u914d\u7f6e\u7684\u6838\u5fc3\u6570\u636e\u7ed3\u6784\u4fee\u6539\u4e3a\u4e86ConcurrentMap\uff0c\u5e76\u57fa\u4e8eputIfAbsent\u7b49 j.u.c API \u505a\u4e86\u5c0f\u91cd\u6784\u3002\u503c\u5f97\u5173\u6ce8\u7684\u662f\u4fee\u6539\u540e\u539f\u5148\u4e32\u884c\u7684\u5bf9diamond\u914d\u7f6e\u7684\u83b7\u53d6\u53d8\u6210\u4e86\u5e76\u884c\uff0c\u89e6\u53d1\u4e86diamond\u670d\u52a1\u7aef\u9650\u6d41\uff0c\u5728\u5927\u91cf\u83b7\u53d6\u76f8\u540c\u5f00\u5173\u914d\u7f6e\u7684\u60c5\u51b5\u4e0b\u6709\u5f88\u5927\u6982\u7387\u629b\u5f02\u5e38\u542f\u52a8\u5931\u8d25\u3002\u00a0<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441312\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u00a0\u00a0(\u5982\u56fe: \u53bb\u9501\u540e\uff0c\u914d\u7f6e\u83b7\u53d6\u7684\u603b\u6b21\u6570\u4e0d\u53d8\uff0c\u4f46\u662f\u8bf7\u6c42\u901f\u7387\u53d8\u5feb)\u00a0\u4e3a\u4e86\u907f\u514d\u4e0a\u8ff0\u95ee\u9898:\u5728\u672c\u5730\u7f13\u5b58switch\u914d\u7f6e\u7684\u83b7\u53d6diamond\u76d1\u542cswitch\u914d\u7f6e\u7684\u53d8\u66f4\uff0c\u786e\u4fdd\u5373\u4f7fswitch\u914d\u7f6e\u88ab\u66f4\u65b0\uff0c\u672c\u5730\u7684\u7f13\u5b58\u4f9d\u7136\u662f\u6700\u65b0\u76847.4 TDDL\u542f\u52a8\u4f18\u5316\u80cc\u666f\u4ecb\u7ecd\uff1aTDDL\uff1a\u57fa\u4e8e Java \u8bed\u8a00\u7684\u5206\u5e03\u5f0f\u6570\u636e\u5e93\u7cfb\u7edf\uff0c\u6838\u5fc3\u80fd\u529b\u5305\u62ec\uff1a\u5206\u5e93\u5206\u8868\u3001\u900f\u660e\u8bfb\u5199\u5206\u79bb\u3001\u6570\u636e\u5b58\u50a8\u5e73\u6ed1\u6269\u5bb9\u3001\u6210\u719f\u7684\u7ba1\u63a7\u7cfb\u7edf\u30027.4.1 \u73b0\u72b6TDDL\u5728\u542f\u52a8\u8fc7\u7a0b\uff0c\u968f\u7740\u5206\u5e93\u5206\u8868\u89c4\u5219\u7684\u589e\u52a0\uff0c\u542f\u52a8\u8017\u65f6\u5448\u7ebf\u6027\u4e0a\u6da8\u8d8b\u52bf\uff0c\u5728\u56fd\u9645\u5316\u591a\u7ad9\u70b9\u7684\u573a\u666f\u4e0b\uff0c\u8017\u65f6\u589e\u957f\u4f1a\u7279\u522b\u660e\u663e\uff0c\u672a\u4f18\u5316\u524d\uff0c\u6211\u4eec\u4e00\u4e2a\u6838\u5fc3\u5e94\u7528TDDL\u542f\u52a8\u8017\u65f6\u4e3a120\u79d2+\uff086\u4e2a\u5e93\uff09\uff0c\u5355\u4e2a\u5e93\u542f\u52a8\u8017\u65f620\u79d2+\uff0c\u4e14\u901a\u8fc7\u591a\u4e2a\u5e93\u5e76\u884c\u542f\u52a8\uff0c\u65e0\u6cd5\u6709\u6548\u964d\u4f4e\u8017\u65f6\u30027.4.2 \u89e3\u51b3\u65b9\u6848\u901a\u8fc7\u5de5\u5177\u5206\u6790\uff0c\u53d1\u73b0\u5c06\u5206\u5e93\u5206\u8868\u89c4\u5219\u8f6c\u6210groovy\u811a\u672c\uff0c\u5e76\u751f\u6210groovy\u7684class\uff0c\u8fd9\u5757\u903b\u8f91\u603b\u8017\u65f6\u975e\u5e38\u4e45\uff0c\u8c03\u7528\u6b21\u6570\u975e\u5e38\u591a\uff0c\u4e14groovy\u5728parseClass\u91cc\u5934\u6709\u52a0\u9501\uff08\u6240\u4ee5\u5e76\u884c\u65e0\u6548\u679c\uff09\u3002\u8c03\u7528\u6b21\u6570\u591a\uff0c\u662f\u56e0\u4e3a\u751f\u6210class\u7684\u4e2a\u6570\uff0c\u4f1a\u5269\u4ee5\u7269\u7406\u8868\u7684\u6570\u91cf\uff0c\u6bd4\u5982\u914d\u7f6e\u91cc\u53ea\u6709\u4e00\u4e2a\u903b\u8f91\u8868 + \u4e00\u4e2a\u89c4\u5219\uff08\u4e0d\u540c\u8868\u7684\u89c4\u5219\u4e5f\u5b58\u5728\u5927\u91cf\u91cd\u590d\uff09\uff0c\u5206\u62101024\u5f20\u7269\u7406\u8868\uff0c\u5b9e\u9645\u542f\u52a8\u65f6\u4f1a\u4ea7\u751f1024\u4e2a\u89c4\u5219\u7c7b\uff0c\u5b58\u5728\u5927\u91cf\u7684\u91cd\u590d\uff0c\u4e0d\u4ec5\u542f\u52a8\u6162\uff0c\u8fd8\u6d6a\u8d39\u4e86\u5f88\u591ametaspace\u3002\u4f18\u5316\u65b9\u6848\u662f\u65b0\u589e\u4e00\u4e2a\u5168\u5c40\u7684GuavaCache\uff0c\u5c06\u89c4\u5219\u548c\u751f\u6210\u7684\u89c4\u5219\u7c7b\u5b9e\u4f8b\u5b58\u653e\u8fdb\u53bb\uff0c\u907f\u514d\u76f8\u540c\u7684\u89c4\u5219\u53bb\u521b\u5efa\u4e0d\u540c\u7684\u7c7b\u548c\u5b9e\u4f8b\u3002\u00a0<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441313\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u00a0\u516b\u3001\u5176\u4ed6\u63d0\u901f\u9664\u4e86\u524d\u9762\u51e0\u7bc7\u6587\u7ae0\u63d0\u5230\u7684\u4f18\u5316\u70b9\uff08ClassLoader\u4f18\u5316\u3001\u4e2d\u95f4\u4ef6\u4f18\u5316\u7b49\uff09\u4ee5\u5916\uff0c\u6211\u4eec\u8fd8\u5bf9\u4e2d\u53f0\u6838\u5fc3\u5e94\u7528\u505a\u4e86\u5176\u4ed6\u542f\u52a8\u4f18\u5316\u7684\u5de5\u4f5c\u30028.1 aspectj\u76f8\u5173\u4f18\u53168.1.1 \u73b0\u72b6\u5728\u8fdb\u884c\u542f\u52a8\u8017\u65f6\u8bca\u65ad\u7684\u65f6\u5019\uff0c\u610f\u5916\u53d1\u73b0aspectj\u8017\u65f6\u7279\u522b\u4e45\uff0c\u8fbe\u5230\u4e8654\u79d2\u591a\uff0c\u4e0d\u53ef\u63a5\u53d7\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441314\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u901a\u8fc7\u5b9a\u4f4d\u53d1\u73b0\uff0c\u5982\u679c\u5e94\u7528\u91cc\u6709\u4f7f\u7528\u5230\u901a\u8fc7\u6ce8\u89e3\u6765\u5224\u65ad\u662f\u5426\u6dfb\u52a0\u5207\u9762\u7684\u89c4\u5219\uff0caspectj\u7684\u8017\u65f6\u5c31\u4f1a\u7279\u522b\u4e45\u3002\u4ee5\u4e0b\u662f\u70ed\u70b9\u5e94\u7528A\u4e2d\u7684\u4f8b\u5b50\uff1a<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441315\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>8.1.2 \u89e3\u51b3\u65b9\u6848\u5c06aspectj\u76f8\u5173jar\u5305\u7248\u672c\u5347\u7ea7\u52301.9.0\u53ca\u4ee5\u4e0a\uff0c\u70ed\u70b9\u5e94\u7528A\u5347\u7ea7\u540e\uff0caspectj\u8017\u65f6\u4ece54.5\u79d2\u964d\u5230\u4e866.3\u79d2\uff0c\u63d0\u901f48\u79d2\u591a\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441316\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u53e6\u5916\uff0c\u9700\u8981\u88abaspectj\u8bc6\u522b\u7684annotation\uff0cRetentionPolicy\u9700\u8981\u662fRUNTIME\uff0c\u4e0d\u7136\u4f1a\u5f88\u6162\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441317\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>8.1.3 \u539f\u7406\u901a\u8fc7\u5de5\u5177\u91c7\u96c6\u5230\u8001\u7248\u672c\u7684aspectj\u5728\u5224\u65ad\u4e00\u4e2abean\u7684method\u4e0a\u662f\u5426\u6709annotation\u65f6\u7684\u4ee3\u7801\u5806\u6808\uff0c\u53d1\u73b0\u5b83\u53bbjar\u5305\u91cc\u8bfb\u53d6class\u6587\u4ef6\u5e76\u89e3\u6790\u7c7b\u4fe1\u606f\uff0c\u8017\u65f6\u8017\u5728\u7c7b\u641c\u7d22\u548c\u89e3\u6790\u4e0a\u3002\u5f53\u770b\u5230\u8fd9\u4e2a\u7684\u65f6\u5019\uff0c\u7b2c\u4e00\u53cd\u5e94\u5c31\u662f\uff0cjava.lang,Method\u4e0d\u662f\u6709getAnnotation\u65b9\u6cd5\u4e48\uff0c\u4e3a\u4ec0\u4e48\u8981\u7ed5\u4e00\u5708\u81ea\u5df1\u53bb\u4ecejar\u5305\u91cc\u89e3\u6790\u51fa\u6765\u3002\u4e0d\u592a\u7406\u89e3\uff0c\u5c31\u5c1d\u8bd5\u53bb\u770b\u770b\u6700\u65b0\u7248\u672c\u7684aspectj\u8fd9\u5757\u662f\u5426\u6709\u6539\u52a8\uff0c\u6700\u7ec8\u53d1\u73b0\u5347\u7ea7\u5373\u53ef\u89e3\u51b3\u3002aspectj\u53bbclass\u539f\u59cb\u6587\u4ef6\u4e2d\u8bfb\u53d6\u7684\u539f\u56e0\u662fannotation\u7684RetentionPolicy\u5982\u679c\u4e0d\u662fRUNTIME\u7684\u8bdd\uff0c\u8fd0\u884c\u65f6\u662f\u83b7\u53d6\u4e0d\u5230\u7684\uff0c\u8be6\u89c1\uff1ajava.lang.annotation.RetentionPolicy\u7684\u6ce8\u91ca<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441318\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>1.8.8\u7248\u672c\u5728\u5224\u65ad\u662f\u5426\u6709\u6ce8\u89e3\u7684\u903b\u8f91\uff1a<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441319\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>1.9.8\u7248\u672c\u5728\u5224\u65ad\u662f\u5426\u6709\u6ce8\u89e3\u7684\u903b\u8f91\uff1a\u4e0e\u8001\u7248\u672c\u7684\u5dee\u5f02\u5728\u4e8e\u4f1a\u5224\u65adannotation\u7684RetentionPolicy\u662f\u4e0d\u662fRUNTIME\u7684\uff0c\u662f\u7684\u8bdd\uff0c\u5c31\u76f4\u63a5\u4eceMethod\u91cc\u83b7\u53d6\u4e86\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441320\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>\u8001\u7248\u672caspectj\u7684\u76f8\u5173\u6267\u884c\u5806\u6808\uff1a\uff08\u683c\u5f0f\uff1a\u65f6\u95f4|\u7c7b\u540d|\u65b9\u6cd5\u540d|\u884c\u6570\uff09<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042441321\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><br \/>8.2 tbbpm\u76f8\u5173\u4f18\u5316\uff08javassist &#038; javac\uff098.2.1 \u73b0\u72b6\u4e2d\u53f0\u5927\u90e8\u5206\u5e94\u7528\u90fd\u4f7f\u7528tbbpm\u6d41\u7a0b\u5f15\u64ce\uff0c\u8be5\u5f15\u64ce\u4f1a\u5c06\u6d41\u7a0b\u914d\u7f6e\u6587\u4ef6\u7f16\u8bd1\u6210java class\u6765\u8fdb\u884c\u8c03\u7528\uff0c\u4ee5\u63d0\u5347\u6027\u80fd\u3002tbbpm\u9ed8\u8ba4\u662f\u4f7f\u7528com.sun.tools.javac.Main\u5de5\u5177\u6765\u5b9e\u73b0\u4ee3\u7801\u7f16\u8bd1\u7684\uff0c\u901a\u8fc7\u5de5\u5177\u5206\u6790\uff0c\u53d1\u73b0\u8be5\u8fc7\u7a0b\u7279\u522b\u8017\u65f6\uff0c\u4ea4\u6613\u5e94\u7528A\u8fd9\u5757\u8017\u65f6\u572857\u79d2\u591a\u30028.2.2 \u89e3\u51b3\u65b9\u6848\u901a\u8fc7\u91c7\u7528javassist\u6765\u7f16\u8bd1bpm\u6587\u4ef6\uff0c\u5e94\u7528A\u9884\u7f16\u8bd1bpm\u6587\u4ef6\u7684\u8017\u65f6\u4ece57\u79d2\u591a\u964d\u5230\u4e868\u79d2\u591a\uff0c\u5feb\u4e8649\u79d2\u30028.2.3 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href=\"https:\/\/link.segmentfault.com\/?enc=lj7quOZTIS1M5p6HFlCvQQ%3D%3D.CxwyeUl0SzSeOa9S67F3Z%2F44qygbnhisS4dSOIF5hYi6UJyCKM4yRA5QUUSO8BHoVcFzCtyoxMT%2BCQCyr6Bx0ZNvfXz5UGXy6vNsf6AQRLMvnW2VVaxl%2FFG8SaJnQR7CyoauF6jjjuQ%2FtGDy4OzoxgKbhIp%2B46QPtQmAK6UjBWk8HJgazPbCgQZhikuUO6BiGk8QNZrx8ahG4HxTfOH0Bg%3D%3D\" rel=\"nofollow\">https:\/\/github.com\/apache\/mav&#8230;<\/a>[2]<a href=\"https:\/\/link.segmentfault.com\/?enc=QsgmnmWZRRH6C%2Bp8lOpUgw%3D%3D.iJgRZokY%2Bt7n14fFAx9F7LTPR%2FnMEpDgQhDylB2CJazkSMvEZkZC%2FQSvQqtOOldd0GQ2L9JAu8WbUW5QW2FceTs28JJ3HMQV4tUNp%2Bg13kRF8gS9MFVwOxALzW3YP0bW32uv9so0TPL2kMKCuhPdNSq50QLYuLl0jL%2BZz12SnM3t118XDG0X4gpIkliO28xS%2Fp9Qp6%2Fok%2BMBYChwtrS%2FSPNo8DXtk%2BYaKgWtOtn%2BKHqLgql0hpt%2FBYKskQd90Ipu\" rel=\"nofollow\">https:\/\/github.com\/JetBrains\/&#8230;<\/a>[3]<a href=\"https:\/\/link.segmentfault.com\/?enc=dBDXjhRKHcBsXxjAGwty5w%3D%3D.f8Z7raotxod29mByYw%2FLxJDtOD84WUTiK%2FcvS9ClJD%2B%2BcCNDRAvZXmQLs1flp4hv\" 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