{"id":843,"date":"2020-10-19T11:50:27","date_gmt":"2020-10-19T03:50:27","guid":{"rendered":"http:\/\/www.dongchangbin.net.cn\/?p=843"},"modified":"2020-10-19T11:50:33","modified_gmt":"2020-10-19T03:50:33","slug":"spring-jackson%e6%9c%89%e5%8f%af%e8%83%bd%e5%af%bc%e8%87%b4%e7%b1%bb%e6%95%b0%e9%87%8f%e7%88%86%e7%82%b8","status":"publish","type":"post","link":"https:\/\/www.dongchangbin.net.cn\/?p=843","title":{"rendered":"Spring + Jackson\u6709\u53ef\u80fd\u5bfc\u81f4\u7c7b\u6570\u91cf\u7206\u70b8"},"content":{"rendered":"\n

\u4e0a\u5468\u56db\u7ebf\u4e0a\u7684\u4e00\u4e2a\u5e94\u7528\u7a81\u7136\u5047\u6b7b\u72b6\u6001\uff0c\u901a\u8fc7gc log\u53d1\u73b0\u6b63\u5728\u9891\u7e41\u7684full gc\uff0c\u4ecegc log\u4e0a\u53ef\u4ee5\u770b\u51fa\u662fMetaspace\u5bfc\u81f4\u9891\u7e41full gc(\u5b9e\u9645\u4e0a\u8fd9\u4e2a\u65f6\u5019Metaspace\u8fd8\u6ca1\u6ee1\uff0c\u8fd8\u6709\u51e0\u5341M\u7684\u5269\u4f59)\uff0c\u7136\u540e\u7528jmap -histo <pid>\u53d1\u73b0\u6709\u5927\u91cf\u7684GeneratedConstructorAccessorXXX\u548cGeneratedMethodAccessorXXX\u7c7b\u578b\u7684\u5bf9\u8c61(\u603b\u5171\u6709\u4e24\u4e07\u591a\u4e2a)\u3002<\/p>\n\n\n\n

\u719f\u6089java\u53cd\u5c04\u7684\u540c\u5b66\u5e94\u8be5\u77e5\u9053\uff0c\u8fd9\u4e24\u4e2a\u7c7b\u90fd\u662f\u5728\u53cd\u5c04\u8fc7\u7a0b\u4e2d\u8c03\u7528Method.invoke\u4ea7\u751f\u7684\uff0c\u524d\u8005\u987e\u540d\u601d\u4e49\u5c31\u662f\u8c03\u7528\u6784\u9020\u51fd\u6570\u4ea7\u751f\u7684\uff0c\u540e\u8005\u5c31\u662f\u8c03\u7528\u666e\u901a\u7684\u65b9\u6cd5\u4ea7\u751f\u7684\uff0c\u751f\u6210\u8fd9\u4e2a\u7c7b\u7684\u4ee3\u7801\u5728\uff1aMethodAccessorGenerator<\/strong><\/p>\n\n\n\n

private<\/code> static<\/code> synchronized<\/code> String generateName(<\/code>boolean<\/code> isConstructor,<\/code>boolean<\/code> forSerialization)<\/code>{<\/code>if<\/code> (isConstructor) {<\/code>if<\/code> (forSerialization) {<\/code>int<\/code> num = ++serializationConstructorSymnum;<\/code>return<\/code> \"jdk\/internal\/reflect\/GeneratedSerializationConstructorAccessor\"<\/code> + num;<\/code>} <\/code>else<\/code> {<\/code>int<\/code> num = ++constructorSymnum;<\/code>return<\/code> \"jdk\/internal\/reflect\/GeneratedConstructorAccessor\"<\/code> + num;<\/code>}<\/code>} <\/code>else<\/code> {<\/code>int<\/code> num = ++methodSymnum;<\/code>return<\/code> \"jdk\/internal\/reflect\/GeneratedMethodAccessor\"<\/code> + num;<\/code>}<\/code>}<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u770b\u5230\u5927\u91cf\u7684\u8fd9\u4e24\u4e2a\u7c7b\uff0c\u7b2c\u4e00\u4e2a\u5ff5\u5934\u662f\u8c01\u4f7f\u7528\u53cd\u5c04\u6ca1\u6709\u590d\u7528Method\u5bf9\u8c61\u5427(\u610f\u601d\u662f\uff0c\u6211\u4eec\u5982\u679c\u4f7f\u7528\u53cd\u5c04\u7684\u65f6\u5019\uff0c\u5982\u679c\u8fd9\u4e2a\u53cd\u5c04\u4f1a\u9891\u7e41\u7684\u8c03\u7528\uff0c\u90a3\u4e48\u4e0d\u8981\u6bcf\u6b21\u90fd\u53bb\u62ffMethod\uff0c\u6700\u597d\u5c06method\u7f13\u5b58\u7740\uff0c\u4e0d\u7136\u6210\u672c\u4f1a\u5f88\u9ad8\u7684)\u3002\u6709\u4e86\u8fd9\u4e2a\u5ff5\u5934\u540e\uff0c\u6211\u5c31\u60f3\u5982\u679c\u80fd\u628a\u8fd9\u4e2a\u7c7b\u4ee3\u7801dump\u4e0b\u6765\uff0c\u7136\u540e\u7edf\u8ba1\u4e00\u4e0b\u770b\u770b\uff0c\u662f\u4e0d\u662f\u6709\u4e9b\u65b9\u6cd5\u5bf9\u5e94\u6709\u5f88\u591a\u7684GeneratedMethodAccessor\uff0c\u90a3\u5c31\u57fa\u672c\u4e0a\u77e5\u9053\u662f\u4ec0\u4e48\u65b9\u6cd5\u7684\u53cd\u5c04\u5bfc\u81f4\u7684\u4e86\uff0c\u7136\u540e\u7ffb\u7ffb\u4ee3\u7801\u57fa\u672c\u4e0a\u80fd\u786e\u5b9a\u539f\u56e0\u3002<\/p>\n\n\n\n

\u6b63\u597dgithub\u4e0a\u6709\u4eba\u5199\u4e86\u4e2a\u5de5\u5177\uff0c\u53ef\u4ee5\u5c06class\u7684\u5b57\u8282\u7801dump\u51fa\u6765\uff1adumpclass<\/a><\/p>\n\n\n\n

java -jar dumpclass.jar -p <pid> sun.reflect.GeneratedMethodAccessor*<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u8fd9\u6837\u5c31\u53ef\u4ee5\u5c06\u6240\u6709\u7684\u8fd9\u6837\u7684\u7c7b\u7684\u5b57\u8282\u7801\u5168\u90e8dump\u51fa\u6765\u4e86\uff0c\u6709\u7c7b\u5b57\u8282\u7801\u7136\u540e\u6211\u4eec\u4f7f\u7528javap\u5bf9\u5b57\u8282\u7801\u8fdb\u884c\u53cd\u7f16\u8bd1\uff0c\u7136\u540e\u5c31\u53ef\u4ee5\u8fdb\u884c\u7edf\u8ba1\u4e86\u3002\u9057\u61be\u7684\u662f\uff0c\u6700\u540e\u53d1\u73b0\u51e0\u4e4e\u6ca1\u6709\u4e24\u4e2a\u4e0d\u540c\u7684GeneratedMethodAccessor\u7c7b\u5c5e\u4e8e\u540c\u4e00\u4e2a\u65b9\u6cd5\u53cd\u5c04\u751f\u6210\u7684\u3002\u7ebf\u7d22\u5230\u8fd9\u91cc\u5c31\u65ad\u4e86\uff0c\u90a3\u8bf4\u660e\u4e0d\u662f\u56e0\u4e3a\u6ca1\u6709\u7f13\u5b58Method\u5bfc\u81f4\u7684\uff0c\u800c\u662f\u6b63\u5e38\u7684\u53cd\u5c04\u4f7f\u7528\u3002\u7136\u540e\u6211\u968f\u673a\u7684\u770b\u4e86\u51e0\u4e2aGeneratedMethodAccessor\u7c7b\u7684\u5b57\u8282\u7801\uff0c\u6240\u6709\u7684\u65b9\u6cd5\u57fa\u672c\u4e0a\u90fd\u662fgetter\uff0c\u90a3\u8fd9\u8bf4\u660e\u4ec0\u4e48\u5462\uff1f\u4e00\u822c\u5982\u679c\u662f\u4e1a\u52a1\u4ee3\u7801\u91cc\u4f7f\u7528\u53cd\u5c04\uff0c\u5927\u90e8\u5206\u662f\u8c03\u7528\u4e00\u4e2a\u4e1a\u52a1\u65b9\u6cd5\uff0c\u800c\u4ec0\u4e48\u4f1a\u53bb\u8c03\u7528getter\u5462\uff1f\u6bd4\u5982\u5e8f\u5217\u5316\uff0c\u6bd4\u5982json\u3002\u8fd9\u4e2a\u65f6\u5019\u6211\u6b63\u597d\u770b\u5230\u8fd9\u4e2a\u5e94\u7528\u91cc\u6709\u5f88\u591a\u5730\u65b9\u6253\u5370\u65e5\u5fd7\uff0c\u800c\u6253\u5370\u65e5\u5fd7\u7684\u65f6\u5019\u662f\u76f4\u63a5\u4f7f\u7528Jackson\u5c06\u5bf9\u8c61\u5e8f\u5217\u5316\u4e4b\u540e\u6253\u5370\uff0c\u8fd9\u91cc\u4f7f\u7528\u7684Jackson\u5e8f\u5217\u5316\u5de5\u5177\u662f\u516c\u5171\u5305(common-api)\u91cc\u7528Jackson\u5c01\u88c5\u7684\u4e00\u4e2a\u5de5\u5177\u7c7b\u3002<\/p>\n\n\n\n

\u7136\u540e\u6211\u5c31\u6000\u7591\u662f\u4e0d\u662f\u8fd9\u4e2a\u5e94\u7528\u8bb0\u5f55\u65e5\u5fd7\u592a\u591a\u4e86\uff0c\u7136\u540eJackson\u5e8f\u5217\u5316\u7684\u65f6\u5019\u4f1a\u53cd\u5c04\u8c03\u7528\u5bf9\u8c61\u7684getter\uff0c\u7136\u540e\u4ea7\u751f\u5927\u91cf\u7684\u8fd9\u4e2aGeneratedMethodAccessor\u7c7b\u5462\uff1f\u4e8e\u662f\u6211\u5c31\u81ea\u5df1\u5199\u4e86\u4e2a\u7b80\u5355\u7684\u6d4b\u8bd5\uff0c\u6211\u53d1\u73b0\u516c\u5171\u5305\u7684\u8fd9\u4e2a\u5de5\u5177\u7c7b\u5e76\u4e0d\u4f1a\u53bb\u8c03\u7528Method.invoke\uff0c\u8fd9\u5c31\u5947\u602a\u4e86\uff0c\u4e0d\u662fJackson\u5bfc\u81f4\u7684\uff1f<\/p>\n\n\n\n

\u4e0d\u8fc7\u6b63\u597d\u8fd9\u4e2a\u65f6\u5019\uff0c\u6211\u5728GeneratedMethodAccessor\u5b57\u8282\u7801\u91cc\u9664\u4e86\u770b\u5230\u4e86getter\uff0c\u4e5f\u770b\u5230\u4e86setter\u65b9\u6cd5\u3002\u6709\u4e86setter\u65b9\u6cd5\uff0c\u90a3\u8bf4\u660e\u5e94\u8be5\u4e0d\u662f\u6253\u5370\u65e5\u5fd7\u5bfc\u81f4\u7684\uff0c\u6253\u5370\u65e5\u5fd7\u53ea\u4f1a\u5e8f\u5217\u5316\u4e0d\u4f1a\u53cd\u5e8f\u5217\u5316\uff0c\u7ebf\u7d22\u518d\u6b21\u4e2d\u65ad\u3002<\/p>\n\n\n\n

\u7136\u540e\u6211\u5c31\u4eceGeneratedMethodAccessor\u7684\u5b57\u8282\u7801\u91cc\u627e\u5230\u4e00\u4e2a\u7c7b\uff0c\u7136\u540e\u67e5\u627e\u5f15\u7528\uff0c\u6700\u540e\u627e\u5230\u4e86Spring\u7684Controller\u8fd9\u4e00\u5c42\u3002\u8fd9\u4e2a\u5e94\u7528\u63d0\u4f9b\u4e86\u975e\u5e38\u975e\u5e38\u591a\u7684HTTP API\uff0c\u7136\u540e\u8fd9\u4e9bController\u57fa\u672c\u4e0a\u90fd\u662f\u8fd4\u56de\u5bf9\u8c61\u7684\u65b9\u5f0f\u8fd4\u56de\u54cd\u5e94\uff0c\u5e76\u4e14Controller\u7684\u53c2\u6570\u63a5\u53d7\u7684\u4e5f\u662f\u5bf9\u8c61\uff0c\u7c7b\u4f3c\u4e0b\u9762\u8fd9\u6837\u7684:<\/p>\n\n\n\n

@RequestMapping<\/code>(value = <\/code>\"\/api\/web\/businessInfo\/list\/v2\"<\/code>, method = RequestMethod.POST)<\/code>@JsonResponseBody<\/code>\/\/\u8fd4\u56deBusinessInfoGridVO\u5bf9\u8c61\uff0c\u63a5\u53d7BusinessInfoListVO\u5bf9\u8c61<\/code>public<\/code> Pager<BusinessInfoGridVO> BusinessInfoListV2(<\/code>@RequestBody<\/code> BusinessInfoListVO infoListVO) {<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u6211\u4eec\u90fd\u77e5\u9053\uff0c\u8fd4\u56de\u5bf9\u8c61\u7684\u65b9\u5f0f\u8fd4\u56de\u54cd\u5e94\uff0c\u5728Spring\u6846\u67b6\u91cc\uff0c\u4f1a\u4f7f\u7528HttpMessageConverter\u8fdb\u884c\u5e8f\u5217\u5316\uff0c\u7136\u540e\u5c06\u5e8f\u5217\u5316\u7ed3\u679c\u5410\u7ed9\u5ba2\u6237\u7aef\uff0c\u800c\u63a5\u53d7\u5bf9\u8c61\u4e5f\u662f\u5728Spring\u6846\u67b6\u91cc\u53cd\u5e8f\u5217\u5316\u6210\u5bf9\u8c61\u3002\u7136\u540e\u6211\u627e\u5230\u4e86\u8fd9\u4e2a\u8fd9\u4e2a\u5e94\u7528\u7684HttpMessageConverter\u914d\u7f6e(\u5b9e\u9645\u4e0a\u516c\u53f8\u7684web\u5e94\u7528\uff0c\u5982\u679c\u5f15\u5165\u4e86common-web, common-web-support\uff0c\u662f\u4e0d\u9700\u8981\u914d\u7f6eHttpMessageConverter\u7684)\uff1a<\/p>\n\n\n\n

@Override<\/code>public<\/code> void<\/code> configureMessageConverters(List<HttpMessageConverter<?>> converters) {<\/code>super<\/code>.configureMessageConverters(converters);<\/code>converters.add(<\/code>new<\/code> MappingJackson2HttpMessageConverter(JsonUtil.getObjectMapperInstance()));<\/code>}<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u901a\u8fc7\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u4f7f\u7528\u7684\u662fMappingJackson2HttpMessageConverter\uff0c\u800c\u4f20\u5165MappingJackson2HttpMessageConverter\u6784\u9020\u51fd\u6570\u7684\u662f\u4e00\u4e2aObjectMapper\uff1aJsonUtil.getObjectMapperInstance()\u3002\u8fd9\u4e2aJsonUtil\u662f\u8fd9\u4e2a\u5e94\u7528\u81ea\u5df1\u5c01\u88c5\u7684\u4e00\u4e2ajson\u5de5\u5177\u7c7b(\u975e\u6765\u81eacommon\u5305)\uff0c\u7136\u540e\u6211\u5c31\u7528\u8fd9\u4e2a\u5de5\u5177\u7c7b\u5199\u4e2a\u5e8f\u5217\u5316\u6d4b\u8bd5\uff0c\u60ca\u5947\u7684\u53d1\u73b0\u4ea7\u751f\u4e86GeneratedMethodAccessor\u3002\u770b\u6765\u662f\u6709\u4ec0\u4e48\u914d\u7f6e\u5bfc\u81f4\u516c\u5171\u5305\u91cc\u7684\u548c\u8fd9\u91cc\u7684\u4e24\u4e2ajson\u5de5\u5177\u7c7b\u7684\u5dee\u5f02\u3002\u4f46\u662f\u8fd9\u4e2aObjectMapper\u7684\u914d\u7f6e\u592a\u591a\u4e86\uff0c\u5f88\u96be\u770b\u51fa\u6765\u662f\u4ec0\u4e48\u5dee\u5f02\uff0c\u800c\u4e14\u6211\u4e5f\u5bf9Jackson\u672c\u8eab\u7684\u673a\u5236\u4e0d\u592a\u719f\u6089\uff0c\u53ea\u597d\u796d\u8d77\u4e86debug\u5927\u6cd5\u3002<\/p>\n\n\n\n

\u6211\u5148debug\u4e86\u4e00\u4e0b\u516c\u5171\u5305\u91cc\u7684json\u5de5\u5177\u7c7b\uff0c\u53d1\u73b0\u8fd9\u4e2a\u7c7b\u867d\u7136\u4e0d\u4ea7\u751fGeneratedMethodAccessor\uff0c\u4f46\u662f\u4f1a\u4ea7\u751f\u53e6\u5916\u4e00\u4e2a\u7c7b\uff1aXxx$Access4JacksonSerializer00000000\uff0c\u6700\u524d\u9762\u7684Xxx\u662f\u4f60\u539f\u6765\u7684\u7c7b\u540d\u3002\u4f46\u662fJackson\u751f\u6210\u7684\u673a\u5236\u548c\u53cd\u5c04\u751f\u6210\u673a\u5236\u4e0d\u540c\u7684\u662f\u4e00\u4e2a\u7c7b\u53ea\u4f1a\u4ea7\u751f\u4e00\u4e2a\u8fd9\u4e2a\u7c7b\uff0c\u800c\u4f7f\u7528Java\u539f\u751f\u7684\u53cd\u5c04\u662f\u6bcf\u4e2a\u65b9\u6cd5\u4ea7\u751f\u4e00\u4e2a\u7c7b\u3002\u66f4\u6050\u6016\u7684\u662f\uff0cJava\u7684\u53cd\u5c04\u7ed9\u6bcf\u4e2a\u7c7b\u90fd\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5355\u72ecClassloader(DelegatingClassLoader\uff0c\u800c\u8fd9\u4e5f\u662f\u5bfc\u81f4Metaspace\u9891\u7e41full gc\u7684\u5176\u4e2d\u4e00\u4e2a\u539f\u56e0\uff0c\u540e\u6587\u518d\u8bf4)\uff1a<\/p>\n\n\n\n

static<\/code> Class<?> defineClass(String name, <\/code>byte<\/code>[] bytes, <\/code>int<\/code> off, <\/code>int<\/code> len,<\/code>final<\/code> ClassLoader parentClassLoader)<\/code>{<\/code>ClassLoader newLoader = AccessController.doPrivileged(<\/code>new<\/code> PrivilegedAction<ClassLoader>() {<\/code>public<\/code> ClassLoader run() {<\/code>return<\/code> new<\/code> DelegatingClassLoader(parentClassLoader);<\/code>}<\/code>});<\/code>return<\/code> unsafe.defineClass(name, bytes, off, len, newLoader, <\/code>null<\/code>);<\/code>}<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u60f3\u8c61\uff1a\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e07\u4e2agetter+setter(\u5bf9\u4e8e\u5927\u91cf\u7684POJO\u6765\u8bb2\u4e5f\u4e0d\u7b97\u591a\uff0c\u4e5f\u5c31\u603b\u51715000\u4e2afield)\u3002<\/p>\n\n\n\n

\u90a3\u4e3a\u4ec0\u4e48\u516c\u5171\u5305\u91cc\u7684JsonUtil\u4e0d\u8c03\u7528Method.invoke\u5462\uff0c\u7ecf\u8fc7debug\u627e\u5230\u4e86\u751f\u6210Xxx$Access4JacksonSerializer00000000\u7684\u4ee3\u7801\u4f4d\u7f6e\uff1aPropertyAccessorCollector\u3002\u7136\u540e\u8bbe\u7f6e\u65ad\u70b9\uff0c\u8bb0\u5f55stacktrace\uff0c\u5728\u6bcf\u4e2astacktrack\u5305\u542b\u7684\u65b9\u6cd5\u90fd\u8bbe\u7f6e\u65ad\u70b9\uff0c\u7136\u540e\u518ddebug\u8fd9\u4e2a\u5e94\u7528\u81ea\u5df1\u5c01\u88c5\u7684JsonUtil\u7c7b\uff0c\u53d1\u73b0\u8fd9\u4e2aJsonUtil\u6ca1\u8fdb\u5165\u5230\u8fd9\u4e2a\u8def\u5f84\uff0c\u7136\u540e\u5c31\u6253\u5f00\u4e24\u53f0\u7535\u8111\u540c\u65f6debug\uff0c\u770b\u770b\u662f\u5728\u54ea\u91cc\u5f00\u59cb\u8d70\u4e0d\u540c\u7684\u8def\u5f84\u4e86\uff0c\u6700\u7ec8\u53d1\u73b0\u5728\u8fd9\u91cccom.fasterxml.jackson.databind.ser.BeanSerializerFactory\uff1a<\/p>\n\n\n\n

\/\/ Need to allow reordering of properties to serialize<\/code>if<\/code> (_factoryConfig.hasSerializerModifiers()) {<\/code>for<\/code> (BeanSerializerModifier mod : _factoryConfig.serializerModifiers()) {<\/code>props = mod.orderProperties(config, beanDesc, props);<\/code>}<\/code>}<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u8fd9\u5c31\u5f88\u660e\u663e\u4e86\uff0c_factoryConfig.hasSerializerModifiers()\u770b\u8d77\u6765\u662f\u914d\u7f6e\u7684\u4e1c\u897f\u5bfc\u81f4\u7684\u3002\u66d9\u5149\u6765\u4e86\uff0c\u540e\u6765\u53d1\u73b0\u662f\u8fd9\u4e2a\u662f\u4e0b\u9762\u8fd9\u4e2a\u914d\u7f6e\u5bfc\u81f4hasSerializerModifiers\u4e3atrue\uff0c\u5728\u516c\u5171\u5305\u7684json\u5de5\u5177\u7c7b\u91cc\u662f\u6709\u8fd9\u4e2a\u914d\u7f6e\u7684\uff0c\u800c\u8fd9\u4e2aJsonUtil\u662f\u6ca1\u6709\u914d\u7f6e\u7684\u3002<\/p>\n\n\n\n

objectMapper.registerModules(<\/code>new<\/code> AfterburnerModule())<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u73b0\u5728\u95ee\u9898\u57fa\u672c\u4e0a\u786e\u5b9a\u4e86\uff0c\u4e5f\u5c31\u662fSpring\u4f7f\u7528\u7684Jackson\u5e8f\u5217\u5316\u5bfc\u81f4\u7684\uff0c\u53ea\u9700\u8981\u6539\u4e00\u4e0b\u914d\u7f6e\u57fa\u672c\u4e0a\u5c31\u6ca1\u6709\u95ee\u9898\u4e86(AfterburnerModule github<\/a>)\u3002<\/p>\n\n\n\n

\u4f46\u662f\u5728\u67e5\u8fd9\u4e2a\u95ee\u9898\u7684\u65f6\u5019\uff0c\u8fd8\u6709\u53e6\u5916\u4e00\u4e2a\u95ee\u9898\uff1a\u5176\u5b9e\u9891\u7e41\u53d1\u751ffull gc\u7684\u65f6\u5019\uff0cMetaspace\u5e76\u6ca1\u6709\u6ee1\u3002\u90a3\u4e48\u6ca1\u6709\u6ee1\u4e3a\u5565\u5c31\u9891\u7e41full gc\u5462\uff0c\u5176\u5b9eMetaspace\u7684\u5185\u5b58\u5206\u914d\u662f\u6309\u7167classloader\u5206\u914d\u7684\uff0c\u4e5f\u5c31\u662f\u4f1a\u7ed9\u6bcf\u4e2aclassloader\u5206\u914d\u4e00\u5757\u5185\u5b58\uff0c\u6240\u4ee5\u5982\u679c\u5b58\u5728\u5927\u91cf\u7684classloader\u7684\u8bdd\uff0c\u4f1a\u6709\u5f88\u4e25\u91cd\u7684\u788e\u7247\u95ee\u9898\uff0c\u788e\u7247\u591a\u4e86\u81ea\u7136\u6ca1\u6709\u6ee1\u5c31\u4f1afull gc\u4e86\u3002<\/p>\n\n\n\n

\u540e\u8bb0<\/strong><\/p>\n\n\n\n

1. \u7ecf\u5e38\u770b\u5230\u5404\u79cd\u9879\u76ee\u91cc\u6709JsonUtil, HttpUtil\uff0cDateUtil, StringUtil\u7b49\u7b49\u5404\u79cdUtil\uff0c\u5f3a\u70c8\u4e0d\u5efa\u8bae\u8fd9\u6837\u505a\uff0c\u4e00\u6765\u662f\u6ca1\u6709\u4ec0\u4e48\u5fc5\u8981\uff0c\u4e8c\u6765\u4e5f\u8ba9\u540e\u6765\u7684\u4eba\u4ea7\u751f\u56f0\u60d1\uff0c\u4e09\u6765\u5982\u679c\u6709bug\u4ec0\u4e48\u7684\u516c\u5171\u5305\u91cc\u53ef\u4ee5\u96c6\u4e2d\u4fee\u590d\uff0c\u53e6\u5916\u516c\u5171\u5305\u91cc\u7684\u7c7b\u4e5f\u7ecf\u8fc7\u4e86\u66f4\u5145\u5206\u7684\u6d4b\u8bd5\u3002<\/p>\n\n\n\n

2. \u5f88\u591a\u5e94\u7528\u91cc\u6253\u5370\u4e86\u5927\u91cf\u7684\u65e5\u5fd7\uff0c\u4e3b\u8981\u662f\u62c5\u5fc3\u67e5\u95ee\u9898\u7684\u65f6\u5019\u6ca1\u6709\u7ebf\u7d22\uff0c\u4f46\u662f\u76f4\u63a5\u5c06\u5bf9\u8c61\u5e8f\u5217\u5316\u7684\u65b9\u5f0f\u6253\u5370\u65e5\u5fd7\u5e76\u4e0d\u53ef\u53d6\uff0c\u9996\u5148\u662f\u8fd9\u6837\u6253\u5370\u7684\u65e5\u5fd7\u592a\u591a\u592a\u591a\u4e86\uff0c\u5b8c\u5168\u6ca1\u6709\u5fc5\u8981\uff0c\u6d88\u8017\u8d44\u6e90\u4e0d\u8bf4\uff0c\u8fd8\u6709\u53ef\u80fd\u6cc4\u9732\u4e00\u4e9b\u654f\u611f\u4fe1\u606f\u3002\u90a3\u4e48\u5373\u4f7f\u8981\u5c06\u5bf9\u8c61\u5b8c\u5168\u6253\u5370\u51fa\u6765\uff0c\u6700\u597d\u4e5f\u662f\u901a\u8fc7\u8986\u76d6toString\u7684\u65b9\u6cd5\u6765\u8f93\u51fa\u65e5\u5fd7\uff0c\u4f7f\u7528lombok\u7b49\u5de5\u5177\u8986\u76d6toString\u65b9\u6cd5\u4e5f\u51e0\u4e4e\u6ca1\u6709\u4ec0\u4e48\u6210\u672c\u3002<\/p>\n\n\n\n

3. HttpMessageConverter\u8fd9\u4e2a\u914d\u7f6e\u516c\u5171\u5305\u91cc\u5df2\u7ecf\u914d\u7f6e\u597d\u4e86\uff0c\u4e0d\u9700\u8981\u81ea\u5df1\u518d\u5b9a\u4e49<\/p>\n\n\n\n

\u6ce8\uff1a\u8f6c\u8f7d\u81ea\u516c\u53f8\u5185wiki<\/p>\n","protected":false},"excerpt":{"rendered":"

\u4e0a\u5468\u56db\u7ebf\u4e0a\u7684\u4e00\u4e2a\u5e94\u7528\u7a81\u7136\u5047\u6b7b\u72b6\u6001\uff0c\u901a\u8fc7gc log\u53d1\u73b0\u6b63\u5728\u9891\u7e41\u7684full gc\uff0c\u4ecegc log\u4e0a\u53ef\u4ee5\u770b\u51fa\u662fMe […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[89],"tags":[133,131,134,130,132],"class_list":["post-843","post","type-post","status-publish","format-standard","hentry","category-89","tag-full-gc","tag-jackson","tag-metaspace","tag-spring","tag-132"],"yoast_head":"\nSpring + Jackson\u6709\u53ef\u80fd\u5bfc\u81f4\u7c7b\u6570\u91cf\u7206\u70b8 - Dong's Blog<\/title>\n<meta name=\"description\" content=\"Spring\u4f7f\u7528\u7684Jackson\u5e8f\u5217\u5316\u5bfc\u81f4\u7684\uff0c\u521b\u5efa\u5927\u91cf\u7684GeneratedConstructorAccessorXXX\u548cGeneratedMethodAccessorXXX\u7c7b\u578b\u7684\u5bf9\u8c61\uff0c\u5206\u914d\u4e86\u5927\u91cf\u7684Metaspace\uff0c\u6700\u7ec8\u5bfc\u81f4\u5e94\u7528\u9891\u7e41full gc \uff0c\u5e94\u7528\u5047\u6b7b\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dongchangbin.net.cn\/?p=843\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spring + Jackson\u6709\u53ef\u80fd\u5bfc\u81f4\u7c7b\u6570\u91cf\u7206\u70b8 - 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