{"id":77885,"date":"2020-11-15T10:43:17","date_gmt":"2020-11-15T02:43:17","guid":{"rendered":"http:\/\/leybreeze.com\/blog\/?p=77885"},"modified":"2020-11-15T10:43:17","modified_gmt":"2020-11-15T02:43:17","slug":"java-%e8%bf%90%e8%a1%8c%e6%97%b6%e5%8f%91%e7%94%9f-noclassdeffounderror-could-not-initialize-class-%e7%9a%84%e8%a7%a3%e5%86%b3%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"http:\/\/leybreeze.com\/blog\/?p=77885","title":{"rendered":"Java \u8fd0\u884c\u65f6\u53d1\u751f NoClassDefFoundError: Could not initialize class \u7684\u89e3\u51b3\u65b9\u6cd5"},"content":{"rendered":"\n<p>\u6700\u8fd1\u9047\u5230\u4e86\u5982\u4e0b\u95ee\u9898\uff1a<\/p>\n\n\n\n<p>\u5728\u7f16\u8bd1\u65f6\u6ca1\u6709\u5f02\u5e38\u7684\u7a0b\u5e8f\uff0c\u5728\u8fd0\u884c\u65f6\u629b\u51fa\u5f02\u5e38\u79f0 <code>NoClassDefFoundError: Could not initialize class {\u7c7b\u540d}<\/code>\u3002<\/p>\n\n\n\n<p>\u6839\u636e Java \u5b98\u65b9\u6587\u6863\uff0c<a rel=\"noreferrer noopener\" href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/lang\/NoClassDefFoundError.html\" target=\"_blank\">NoClassDefFoundError<\/a> \u662f\u7531\u4e8e JVM \u6216 ClassLoader \u5b9e\u4f8b\u4e3a\u4e86\u8c03\u7528\u67d0\u4e2a\u7c7b\u7684\u65b9\u6cd5\u6216 new \u7c7b\u7684\u65b0\u7684\u5b9e\u4f8b\uff0c\u800c\u8bd5\u56fe\u52a0\u8f7d\u8be5\u7c7b\u7684\u5b9a\u4e49\u65f6\uff0c\u5374\u65e0\u6cd5\u627e\u5230\u5176\u5b9a\u4e49\uff0c\u800c\u629b\u51fa\u7684\u5f02\u5e38\u3002\u9700\u8981\u6ce8\u610f\uff0c\u5bf9\u4e8e\u629b\u51fa\u8be5\u5f02\u5e38\u7684\u60c5\u51b5\uff0c\u8bd5\u56fe\u627e\u5230\u7684\u7c7b\u7684\u5b9a\u4e49\u5728\u7f16\u8bd1\u65f6\u5b58\u5728\uff0c\u53ea\u662f\u5728\u8fd0\u884c\u65f6\u4e0d\u77e5\u6240\u8e2a\u3002<\/p>\n\n\n\n<p>NoClassDefFoundError \u603b\u7684\u6765\u8bb2\u6709\u4e24\u79cd\u60c5\u51b5\uff0c\u7c7b\u6587\u4ef6\u4e0d\u5b58\u5728\uff0c\u6216\u662f\u7c7b\u521d\u59cb\u5316\u9519\u8bef\u3002\u5b83\u4eec\u7684\u9519\u8bef\u4fe1\u606f\u4e0d\u540c\u3002<\/p>\n\n\n\n<ul><li>\u5982\u679c\u65e0\u6cd5\u627e\u5230\u7c7b\u6587\u4ef6\uff0c\u9519\u8bef\u4fe1\u606f\u4e3a<code> java.lang.NoClassDefFoundError: com\/example\/Foo<\/code>\u3002<\/li><li>\u5982\u679c\u7c7b\u6587\u4ef6\u521d\u59cb\u5316\u9519\u8bef\uff0c\u9519\u8bef\u4fe1\u606f\u5219\u5982\u524d\u6587\u6240\u63d0\uff0c\u4e3a <code>NoClassDefFoundError: Could not initialize class {\u7c7b\u540d}<\/code>\u3002\u8fd9\u901a\u5e38\u7531\u7c7b\u7684\u9759\u6001\u6210\u5458\u6216\u9759\u6001\u521d\u59cb\u5316\u8bed\u53e5\u5757\u5f15\u8d77\u3002\u8bf8\u5982 <code>private static final MyClass val = new MyClass();<\/code> \u6216\u76f4\u63a5\u6267\u884c\u4e8e <code>static {}<\/code> \u4ee3\u7801\u5757\u4e2d\u7684\u8bed\u53e5\u629b\u51fa\u5f02\u5e38\uff0c\u90fd\u53ef\u80fd\u4f1a\u5f15\u53d1 NoClassDefFoundError\u3002\u9488\u5bf9\u7b2c\u4e8c\u79cd\u8fd9\u79cd\u60c5\u51b5\uff0c\u53ef\u4ee5\u5728\u7c7b\u7684 static initializer \u4e2d\u589e\u52a0 try catch \u8bed\u53e5\u6765\u6355\u83b7\u5f02\u5e38\u5e76\u8f93\u51fa\u65e5\u5fd7\uff0c\u6765\u4e86\u89e3\u5177\u4f53\u9519\u8bef\u5185\u5bb9\u3002<\/li><\/ul>\n\n\n\n<p>\u6b64\u5916\u8fd8\u6709\u4e00\u79cd\u76f8\u4f3c\u4f46\u4e0d\u540c\u7684\u9519\u8bef\uff0c<a rel=\"noreferrer noopener\" href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/lang\/ClassNotFoundException.html\" target=\"_blank\">ClassNotFoundException<\/a>\u3002\u5b83\u901a\u5e38\u7531 Java \u8fd0\u884c\u65f6\u5728\u65e0\u6cd5\u627e\u5230\u4ec5\u5728\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u624d\u9700\u8981\u52a0\u8f7d\u7684\u7c7b\u65f6\u629b\u51fa\u3002<\/p>\n\n\n\n<p>\u53ef\u4ee5\u4ece Wikipedia \u7684 <a rel=\"noreferrer noopener\" href=\"https:\/\/en.wikipedia.org\/wiki\/Java_Classloader\" target=\"_blank\">Java Classloader<\/a> \u6761\u76ee\u8fdb\u4e00\u6b65\u4e86\u89e3 classloader \u7684\u884c\u4e3a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6700\u8fd1\u9047\u5230\u4e86\u5982\u4e0b\u95ee\u9898\uff1a \u5728\u7f16\u8bd1\u65f6\u6ca1\u6709\u5f02\u5e38\u7684\u7a0b\u5e8f\uff0c\u5728\u8fd0\u884c\u65f6\u629b\u51fa\u5f02\u5e38\u79f0 NoClassDefFoundError:  &hellip; <a href=\"http:\/\/leybreeze.com\/blog\/?p=77885\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201cJava \u8fd0\u884c\u65f6\u53d1\u751f NoClassDefFoundError: Could not initialize class \u7684\u89e3\u51b3\u65b9\u6cd5\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[135],"tags":[123,165],"_links":{"self":[{"href":"http:\/\/leybreeze.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/77885"}],"collection":[{"href":"http:\/\/leybreeze.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/leybreeze.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/leybreeze.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/leybreeze.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=77885"}],"version-history":[{"count":1,"href":"http:\/\/leybreeze.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/77885\/revisions"}],"predecessor-version":[{"id":77916,"href":"http:\/\/leybreeze.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/77885\/revisions\/77916"}],"wp:attachment":[{"href":"http:\/\/leybreeze.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=77885"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/leybreeze.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=77885"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/leybreeze.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=77885"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}