{"id":4096,"date":"2024-04-20T09:00:16","date_gmt":"2024-04-20T01:00:16","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/index.php\/%e9%9d%a2%e8%af%95\/%e9%9d%a2%e8%af%95%e5%ae%98%ef%bc%9ajava%e4%b8%ad%e5%b8%b8%e8%a7%81%e7%9a%84%e5%86%85%e5%ad%98%e6%ba%a2%e5%87%ba%e9%94%99%e8%af%af%e6%9c%89%e5%93%aa%e4%ba%9b%ef%bc%9f\/"},"modified":"2024-04-20T09:00:16","modified_gmt":"2024-04-20T01:00:16","slug":"%e9%9d%a2%e8%af%95%e5%ae%98%ef%bc%9ajava%e4%b8%ad%e5%b8%b8%e8%a7%81%e7%9a%84%e5%86%85%e5%ad%98%e6%ba%a2%e5%87%ba%e9%94%99%e8%af%af%e6%9c%89%e5%93%aa%e4%ba%9b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/%e9%9d%a2%e8%af%95\/%e9%9d%a2%e8%af%95%e5%ae%98%ef%bc%9ajava%e4%b8%ad%e5%b8%b8%e8%a7%81%e7%9a%84%e5%86%85%e5%ad%98%e6%ba%a2%e5%87%ba%e9%94%99%e8%af%af%e6%9c%89%e5%93%aa%e4%ba%9b%ef%bc%9f\/","title":{"rendered":"\u9762\u8bd5\u5b98\uff1aJava\u4e2d\u5e38\u89c1\u7684\u5185\u5b58\u6ea2\u51fa\u9519\u8bef\u6709\u54ea\u4e9b\uff1f"},"content":{"rendered":"
\n

Java\u4e2d\u5e38\u89c1\u7684\u5185\u5b58\u6ea2\u51fa\u9519\u8bef<\/strong>\u4e3b\u8981\u5305\u62ec\uff1a<\/span><\/p>\n

1\u3001\u5806\u5185\u5b58\u6ea2\u51fa\uff08OutOfMemoryError: Java heap space\uff09:<\/strong><\/span>\u5806\u5185\u5b58\u662f\u7528\u4e8e\u5b58\u50a8Java\u5bf9\u8c61\u5b9e\u4f8b\u548c\u6570\u7ec4\u7684\u533a\u57df\u3002\u5f53\u5e94\u7528\u7a0b\u5e8f\u9700\u8981\u5206\u914d\u66f4\u591a\u5185\u5b58\u800c\u5806\u5185\u5b58\u5df2\u6ee1\u65f6\uff0c\u4f1a\u629b\u51fa\u5806\u5185\u5b58\u6ea2\u51fa\u9519\u8bef\u3002<\/span><\/p>\n

\u793a\u4f8b:<\/span><\/strong><\/p>\n

\n
    \n
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    List<Object> list = new ArrayList<>();<\/span><\/code>while (true) {<\/span><\/code>    list.add(new byte[1024 * 1024]); \/\/ \u6bcf\u6b21\u6dfb\u52a0\u4e00\u4e2a1MB\u5927\u5c0f\u7684\u5b57\u8282\u6570\u7ec4\uff0c\u6700\u7ec8\u5bfc\u81f4\u5806\u5185\u5b58\u8017\u5c3d<\/span><\/code>}<\/span><\/code><\/pre>\n<\/section>\n
    \u907f\u514d\u65b9\u6cd5:<\/span><\/strong><\/span><\/p>\n
      \n
    • \n
      \u4f18\u5316\u4ee3\u7801\u4ee5\u51cf\u5c11\u5185\u5b58\u4f7f\u7528\u3002<\/span><\/p>\n<\/li>\n
    • \n
      \u4f7f\u7528\u5185\u5b58\u5206\u6790\u5de5\u5177\uff08\u5982JProfiler, VisualVM\uff09\u6765\u8bc6\u522b\u5185\u5b58\u6cc4\u6f0f\u3002<\/span><\/p>\n<\/li>\n
    • \n
      \u8c03\u6574JVM\u542f\u52a8\u53c2\u6570\u589e\u52a0\u6700\u5927\u5806\u5185\u5b58-Xmx \u7684\u503c\u3002<\/span><\/p>\n<\/li>\n
    • \n
      \u5982\u679c\u662f\u4e34\u65f6\u521b\u5efa\u7684\u5927\u91cf\u5bf9\u8c61\uff0c\u8003\u8651\u4f7f\u7528\u7f13\u5b58\u6216\u5bf9\u8c61\u6c60\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n
      2\u3001\u6808\u5185\u5b58\u6ea2\u51fa\uff08StackOverflowError\uff09:<\/span><\/strong>\u6808\u5185\u5b58\u7528\u4e8e\u5b58\u653e\u7ebf\u7a0b\u7684\u8c03\u7528\u5806\u6808\uff0c\u5305\u62ec\u5c40\u90e8\u53d8\u91cf\u548c\u65b9\u6cd5\u8c03\u7528\u4fe1\u606f\u3002\u9012\u5f52\u8c03\u7528\u8fc7\u6df1\u6216\u8005\u8bf7\u6c42\u7684\u6808\u7a7a\u95f4\u8fc7\u5927\u4f1a\u5bfc\u81f4\u6808\u5185\u5b58\u6ea2\u51fa\u3002<\/span><\/section>\n
      \u793a\u4f8b:<\/span><\/strong><\/p>\n
      \n
        \n
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      • <\/li>\n<\/ul>\n
        public void recursiveMethod() {<\/span><\/code>    recursiveMethod(); \/\/ \u65e0\u9650\u9012\u5f52\u5c06\u5bfc\u81f4\u6808\u5185\u5b58\u6ea2\u51fa<\/span><\/code>}<\/span><\/code><\/pre>\n<\/section>\n
        \u907f\u514d\u65b9\u6cd5:<\/span><\/strong><\/p>\n
          \n
        • \n
          \u907f\u514d\u4f7f\u7528\u6df1\u5ea6\u9012\u5f52\u8c03\u7528\uff0c\u6539\u4e3a\u5faa\u73af\u6216\u5176\u4ed6\u7b97\u6cd5\u3002<\/span><\/p>\n<\/li>\n
        • \n
          \u68c0\u67e5\u662f\u5426\u6709\u65e0\u610f\u7684\u65e0\u9650\u9012\u5f52\u3002<\/span><\/p>\n<\/li>\n
        • \n
          \u8c03\u6574JVM\u542f\u52a8\u53c2\u6570\u51cf\u5c11\u6bcf\u4e2a\u7ebf\u7a0b\u6808\u7684\u5927\u5c0f-Xss\uff0c\u4ee5\u4fbf\u80fd\u591f\u5bb9\u7eb3\u66f4\u591a\u7ebf\u7a0b\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n
          3\u3001\u65b9\u6cd5\u533a\u6ea2\u51fa\uff08OutOfMemoryError: Metaspace\/PermGen\uff09:<\/strong><\/span>\u65b9\u6cd5\u533a\uff08\u5728Java 8\u4e4b\u524d\u79f0\u4e3a\u6c38\u4e45\u4ee3PermGen\uff0c\u5728Java 8\u53ca\u5176\u4e4b\u540e\u88ab\u5143\u7a7a\u95f4Metaspace\u53d6\u4ee3\uff09\u7528\u4e8e\u5b58\u50a8\u7c7b\u7684\u5143\u6570\u636e\u3001\u9759\u6001\u53d8\u91cf\u7b49\u4fe1\u606f\u3002\u8fc7\u591a\u5730\u52a0\u8f7d\u7c7b\u6216\u8005\u5927\u91cf\u52a8\u6001\u751f\u6210\u7c7b\u53ef\u80fd\u5bfc\u81f4\u65b9\u6cd5\u533a\u6ea2\u51fa\u3002<\/span><\/section>\n
          \u793a\u4f8b:<\/span><\/strong><\/p>\n
          \n
            \n
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            \/\/ \u4f7f\u7528CGLIB\u6216\u5176\u4ed6\u4ee3\u7406\/\u4ee3\u7801\u751f\u6210\u5e93\u4e0d\u65ad\u521b\u5efa\u7c7b\u7684\u793a\u4f8b<\/span><\/code>Enhancer enhancer = new Enhancer();<\/span><\/code>enhancer.setSuperclass(MyClass.class);<\/span><\/code>enhancer.setUseCache(false); \/\/ \u7981\u7528\u7f13\u5b58\u4ee5\u5f3a\u8feb\u6bcf\u6b21\u90fd\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u4ee3\u7406\u7c7b<\/span><\/code>enhancer.setCallback(new MethodInterceptor() {<\/span><\/code>    @Override<\/span><\/code>    public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {<\/span><\/code>        return proxy.invokeSuper(obj, args);<\/span><\/code>    }<\/span><\/code>});<\/span><\/code>while (true) {<\/span><\/code>    enhancer.create();<\/span><\/code>}<\/span><\/code><\/pre>\n<\/section>\n
            \u907f\u514d\u65b9\u6cd5:<\/span><\/strong><\/span><\/p>\n
              \n
            • \n
              \u4e0d\u8981\u521b\u5efa\u8fc7\u591a\u7684\u7c7b\uff0c\u7279\u522b\u662f\u8fd0\u884c\u65f6\u52a8\u6001\u751f\u6210\u7684\u7c7b\u3002<\/span><\/p>\n<\/li>\n
            • \n
              \u6e05\u9664\u5f15\u7528\u4e0d\u518d\u4f7f\u7528\u7684\u7c7b\uff0c\u4f7f\u5b83\u4eec\u53ef\u4ee5\u88ab\u5783\u573e\u56de\u6536\u3002<\/span><\/p>\n<\/li>\n
            • \n
              \u901a\u8fc7JVM\u53c2\u6570\u8c03\u6574\u65b9\u6cd5\u533a\u7684\u5927\u5c0f-XX:MaxMetaspaceSize\uff08\u5bf9\u4e8eMetaspace\uff09\u6216-XX:MaxPermSize\uff08\u5bf9\u4e8ePermGen\uff09\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n
              4\u3001\u76f4\u63a5\u5185\u5b58\u6ea2\u51fa\uff08OutOfMemoryError: Direct buffer memory\uff09:<\/span><\/strong>\u76f4\u63a5\u5185\u5b58\u901a\u5e38\u7528\u4e8eNIO\u64cd\u4f5c\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u51cf\u5c11\u5728Java\u5806\u548c\u672c\u5730\u5806\u4e4b\u95f4\u590d\u5236\u6570\u636e\u7684\u5f00\u9500\u3002\u76f4\u63a5\u5185\u5b58\u4e0d\u53d7JVM\u5783\u573e\u6536\u96c6\u7684\u7ba1\u7406\uff0c\u56e0\u6b64\u5982\u679c\u4e0d\u5f53\u5206\u914d\u53ef\u80fd\u5bfc\u81f4\u6ea2\u51fa\u3002<\/span><\/section>\n
              \u793a\u4f8b:<\/strong><\/span><\/p>\n
              \n
                \n
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                while (true) {<\/span><\/code>    ByteBuffer buffer = ByteBuffer.allocateDirect(10 * 1024 * 1024); \/\/ \u5206\u914d10MB\u7684\u76f4\u63a5\u5185\u5b58<\/span><\/code>    \/\/ \u6ce8\u610f\uff1a\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u4f60\u9700\u8981\u786e\u4fdd\u5408\u7406\u5730\u91ca\u653e\u76f4\u63a5\u5185\u5b58<\/span><\/code>}<\/span><\/code><\/pre>\n<\/section>\n
                \u907f\u514d\u65b9\u6cd5:<\/span><\/strong><\/p>\n
                  \n
                • \n
                  \u660e<\/span>\u667a\u5730\u7ba1\u7406\u76f4\u63a5\u5185\u5b58\u5206\u914d\u4e0e\u91ca\u653e\u3002<\/span><\/p>\n<\/li>\n
                • \n
                  \u5728\u5206\u914d\u5927\u5757\u76f4\u63a5\u5185\u5b58\u524d\u786e\u4fdd\u8db3\u591f\u7684\u5269\u4f59\u7a7a\u95f4\u3002<\/span><\/p>\n<\/li>\n
                • \n
                  \u4f7f\u7528-XX:MaxDirectMemorySize \u53c2\u6570\u6307\u5b9a\u53ef\u7528\u4e8e\u5206\u914d\u7684\u76f4\u63a5\u5185\u5b58\u603b\u91cf\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n
                    <\/ol>\n
                      <\/ol>\n
                      \u5728\u6240\u6709\u60c5\u51b5\u4e0b\uff0c\u7406\u89e3\u5e94\u7528\u7a0b\u5e8f\u7684\u5185\u5b58\u9700\u6c42\uff0c\u5e76\u5408\u7406\u914d\u7f6eJVM\u53c2\u6570\u662f\u907f\u514d\u5185\u5b58\u6ea2\u51fa\u9519\u8bef\u7684\u5173\u952e\u3002\u8fdb\u4e00\u6b65\u7684\uff0c\u7f16\u5199\u9ad8\u6548\u7684\u4ee3\u7801\uff0c\u9075\u5faa\u826f\u597d\u7684\u7f16\u7a0b\u5b9e\u8df5\uff0c\u53ca\u65f6\u91ca\u653e\u4e0d\u518d\u4f7f\u7528\u7684\u8d44\u6e90\uff0c\u4f7f\u7528\u5206\u6790\u5de5\u5177\u76d1\u63a7\u5e94\u7528\u7a0b\u5e8f\u7684\u8fd0\u884c\u65f6\u884c\u4e3a\uff0c\u4e5f\u662f\u9884\u9632\u5185\u5b58\u95ee\u9898\u7684\u6709\u6548\u624b\u6bb5\u3002<\/span><\/p>\n
                      <\/mp-style-type><\/p>\n
                      \n
                      \u672c\u7bc7\u6587\u7ae0\u6765\u6e90\u4e8e\u5fae\u4fe1\u516c\u4f17\u53f7:                 \u4e92\u8054\u7f51\u9762\u8bd5\u5c0f\u5e2e\u624b              <\/p>\n<\/blockquote>\n<\/div>\n","raw":"","protected":false},"excerpt":{"rendered":"
                      Java\u4e2d\u5e38\u89c1\u7684\u5185\u5b58\u6ea2\u51fa\u9519\u8bef\u4e3b\u8981\u5305\u62ec\uff1a 1\u3001\u5806\u5185\u5b58\u6ea2\u51fa\uff08OutOfMemoryError: Java heap space\uff09:\u5806\u5185 …<\/p>\n","protected":false},"author":1,"featured_media":4093,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[30],"tags":[],"class_list":["post-4096","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-30"],"post_thumbnail_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/05\/20240524145122412-150x150.jpeg","content_first_image":null,"post_medium_image_300":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/05\/20240524145122412-300x128.jpeg","post_thumbnail_image_624":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/05\/20240524145122412-1024x437.jpeg","post_frist_image":null,"post_medium_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/05\/20240524145122412-300x128.jpeg","post_large_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/05\/20240524145122412-1024x437.jpeg","post_full_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/05\/20240524145122412.jpeg","post_all_images":[],"videoAdId":"","listAd":"0","listAdId":"","listAdEvery":6,"total_comments":0,"category_name":"\u9762\u8bd5","post_date":"2024-04-20","like_count":"0","praiseWord":"\u9f13\u52b1","copyright_state":"","excitationAd":"0","rewardedVideoAdId":"","detailAdId":"","detailAd":"0","enterpriseMinapp":"0","audios":[],"postImageUrl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230519082947553.jpg","avatarurls":[],"related_posts":null,"pageviews":362,"next_post_id":4544,"next_post_title":"\u9762\u8bd5\u5b98\uff1aRedis\u6709\u54ea\u4e9b\u6301\u4e45\u5316\u673a\u5236\uff08\u5982\u4f55\u4fdd\u969c\u6570\u636e\u4e0d\u4e22\u5931\uff09\uff1f\u8fd9\u4e2aRedis\u5fc5\u7b54\u9898\u4f60\u4e00\u5b9a\u4e0d\u8981\u9519\u8fc7\uff01","previous_post_id":4616,"previous_post_title":"\u4f01\u4e1a\u7ea7Redis\u96c6\u7fa4\u642d\u5efa\u6307\u5357\uff01\uff01\uff01","_links":{"self":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/4096","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/comments?post=4096"}],"version-history":[{"count":0,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/4096\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/media\/4093"}],"wp:attachment":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/media?parent=4096"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/categories?post=4096"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/tags?post=4096"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}