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<link rel="icon" href="/images/favicon.ico"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta property="og:title" content="Arthas"><meta property="og:image:alt" content="Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas - alibaba/arthas: Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas"><meta property="og:image" content="/images/arthas_mate_image.png"><meta property="og:description" content="Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas - alibaba/arthas: Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas"><meta property="og:image:width" content="1200"><meta property="og:image:height" content="600"><meta property="twitter:image:src" content="/images/arthas_mate_image.png"><meta property="twitter:image:alt" content="Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas - alibaba/arthas: Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas"><meta itemprop="name" content="Arthas"><meta itemprop="image" content="/images/arthas_mate_image.png"><meta itemprop="description" content="Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas - alibaba/arthas: Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas"><script>
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</head>
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<body>
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<div id="app"><!--[--><div class="theme-container"><!--[--><header class="navbar"><div class="toggle-sidebar-button" title="切换侧边栏" aria-expanded="false" role="button" tabindex="0"><div class="icon" aria-hidden="true"><span></span><span></span><span></span></div></div><span><a href="/" class="" data-v-61144abc><!----><span class="site-name can-hide" data-v-61144abc>arthas</span><span class="navbar-version" data-v-61144abc>v3.6.6</span></a></span><div class="navbar-items-wrapper" style=""><!--[--><!--]--><nav class="navbar-items can-hide"><!--[--><div class="navbar-item"><a href="/" class="" aria-label="首页"><!--[--><!--]--> 首页 <!--[--><!--]--></a></div><div class="navbar-item"><a class="external-link" href="/doc/arthas-tutorials.html?language=cn&id=arthas-basics" rel="noopener noreferrer" target="_blank" aria-label="在线教程"><!--[--><!--]--><span>在线教程</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a></div><div class="navbar-item"><a href="/doc/" class="router-link-active" aria-label="文档"><!--[--><!--]--> 文档 <!--[--><!--]--></a></div><div class="navbar-item"><a href="/doc/commands.md" class="" aria-label="命令列表"><!--[--><!--]--> 命令列表 <!--[--><!--]--></a></div><div class="navbar-item"><a href="/doc/download.md" class="" aria-label="下载"><!--[--><!--]--> 下载 <!--[--><!--]--></a></div><div class="navbar-item"><div class="navbar-dropdown-wrapper"><button class="navbar-dropdown-title" type="button" aria-label="解决方案"><span class="title">解决方案</span><span class="arrow down"></span></button><button class="navbar-dropdown-title-mobile" type="button" aria-label="解决方案"><span class="title">解决方案</span><span class="right arrow"></span></button><ul style="display:none;" class="navbar-dropdown"><!--[--><li class="navbar-dropdown-item"><a class="external-link" href="https://cn.aliyun.com/product/aliware/mse?spm=arthas.topbar.0.0.0" rel="noopener noreferrer" target="_blank" aria-label="微服务解决方案"><!--[--><!--]--><span>微服务解决方案</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a></li><li class="navbar-dropdown-item"><a class="external-link" href="https://www.aliyun.com/aliware/txc?spm=arthas.topbar.0.0.0" rel="noopener noreferrer" target="_blank" aria-label="分布式事务解决方案"><!--[--><!--]--><span>分布式事务解决方案</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a></li><li class="navbar-dropdown-item"><a class="external-link" href="https://www.aliyun.com/product/ahas?spm=artha
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name numberOfInstances loadedCountTotal
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com.taobao.arthas.agent.ArthasClassloader <span class="token number">1</span> <span class="token number">2115</span>
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BootstrapClassLoader <span class="token number">1</span> <span class="token number">1861</span>
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sun.reflect.DelegatingClassLoader <span class="token number">5</span> <span class="token number">5</span>
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sun.misc.Launcher<span class="token variable">$AppClassLoader</span> <span class="token number">1</span> <span class="token number">4</span>
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sun.misc.Launcher<span class="token variable">$ExtClassLoader</span> <span class="token number">1</span> <span class="token number">1</span>
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Affect<span class="token punctuation">(</span>row-cnt:5<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">3</span> ms.
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="按类加载实例查看统计信息" tabindex="-1"><a class="header-anchor" href="#按类加载实例查看统计信息" aria-hidden="true">#</a> 按类加载实例查看统计信息</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">-l</span>
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name loadedCount <span class="token builtin class-name">hash</span> parent
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BootstrapClassLoader <span class="token number">1861</span> null null
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com.taobao.arthas.agent.ArthasClassloader@68b31f0a <span class="token number">2115</span> 68b31f0a sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@66350f69
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sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@3d4eac69 <span class="token number">4</span> 3d4eac69 sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@66350f69
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sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@66350f69 <span class="token number">1</span> 66350f69 null
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Affect<span class="token punctuation">(</span>row-cnt:4<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">2</span> ms.
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="查看-classloader-的继承树" tabindex="-1"><a class="header-anchor" href="#查看-classloader-的继承树" aria-hidden="true">#</a> 查看 ClassLoader 的继承树</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">-t</span>
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+-BootstrapClassLoader
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+-sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@66350f69
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+-com.taobao.arthas.agent.ArthasClassloader@68b31f0a
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+-sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@3d4eac69
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Affect<span class="token punctuation">(</span>row-cnt:4<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">3</span> ms.
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="查看-urlclassloader-实际的-urls" tabindex="-1"><a class="header-anchor" href="#查看-urlclassloader-实际的-urls" aria-hidden="true">#</a> 查看 URLClassLoader 实际的 urls</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">-c</span> 3d4eac69
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file:/private/tmp/math-game.jar
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file:/Users/hengyunabc/.arthas/lib/3.0.5/arthas/arthas-agent.jar
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Affect<span class="token punctuation">(</span>row-cnt:9<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">3</span> ms.
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><em>注意</em> hashcode 是变化的，需要先查看当前的 ClassLoader 信息，提取对应 ClassLoader 的 hashcode。</p><p>对于只有唯一实例的 ClassLoader 可以通过 class name 指定，使用起来更加方便：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">--classLoaderClass</span> sun.misc.Launcher<span class="token variable">$AppClassLoader</span>
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file:/private/tmp/math-game.jar
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file:/Users/hengyunabc/.arthas/lib/3.0.5/arthas/arthas-agent.jar
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Affect<span class="token punctuation">(</span>row-cnt:9<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">3</span> ms.
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="使用-classloader-去查找-resource" tabindex="-1"><a class="header-anchor" href="#使用-classloader-去查找-resource" aria-hidden="true">#</a> 使用 ClassLoader 去查找 resource</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">-c</span> 3d4eac69 <span class="token parameter variable">-r</span> META-INF/MANIFEST.MF
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jar:file:/System/Library/Java/Extensions/MRJToolkit.jar<span class="token operator">!</span>/META-INF/MANIFEST.MF
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jar:file:/private/tmp/math-game.jar<span class="token operator">!</span>/META-INF/MANIFEST.MF
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jar:file:/Users/hengyunabc/.arthas/lib/3.0.5/arthas/arthas-agent.jar<span class="token operator">!</span>/META-INF/MANIFEST.MF
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>也可以尝试查找类的 class 文件：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">-c</span> 1b6d3586 <span class="token parameter variable">-r</span> java/lang/String.class
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jar:file:/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/rt.jar<span class="token operator">!</span>/java/lang/String.class
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="使用-classloader-去加载类" tabindex="-1"><a class="header-anchor" href="#使用-classloader-去加载类" aria-hidden="true">#</a> 使用 ClassLoader 去加载类</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">-c</span> 3d4eac69 <span class="token parameter variable">--load</span> demo.MathGame
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load class success.
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class-info demo.MathGame
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code-source /private/tmp/math-game.jar
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name demo.MathGame
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isInterface <span class="token boolean">false</span>
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isAnnotation <span class="token boolean">false</span>
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isEnum <span class="token boolean">false</span>
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isAnonymousClass <span class="token boolean">false</span>
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isArray <span class="token boolean">false</span>
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isLocalClass <span class="token boolean">false</span>
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isMemberClass <span class="token boolean">false</span>
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isPrimitive <span class="token boolean">false</span>
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isSynthetic <span class="token boolean">false</span>
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simple-name MathGame
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modifier public
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annotation
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interfaces
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super-class +-java.lang.Object
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class-loader +-sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@3d4eac69
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+-sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@66350f69
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classLoaderHash 3d4eac69
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="统计-classloader-实际使用-url-和未使用的-url" tabindex="-1"><a class="header-anchor" href="#统计-classloader-实际使用-url-和未使用的-url" aria-hidden="true">#</a> 统计 ClassLoader 实际使用 URL 和未使用的 URL</h3><div class="custom-container warning"><p class="custom-container-title">注意</p><p>注意，基于 JVM 目前已加载的所有类统计，不代表<code>Unused URLs</code>可以从应用中删掉。因为可能将来需要从<code>Unused URLs</code>里加载类，或者需要加载<code>resources</code>。</p></div><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ classloader --url-stat
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com.taobao.arthas.agent.ArthasClassloader@3c41660, hash:3c41660
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Used URLs:
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file:/Users/admin/.arthas/lib/3.5.6/arthas/arthas-core.jar
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Unused URLs:
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sun.misc.Launcher$AppClassLoader@75b84c92, hash:75b84c92
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Used URLs:
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file:/Users/admin/code/java/arthas/math-game/target/math-game.jar
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file:/Users/admin/.arthas/lib/3.5.6/arthas/arthas-agent.jar
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Unused URLs:
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sun.misc.Launcher$ExtClassLoader@7f31245a, hash:7f31245a
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Used URLs:
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file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/sunec.jar
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file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/sunjce_provider.jar
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file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/localedata.jar
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Unused URLs:
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file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/nashorn.jar
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file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/cldrdata.jar
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file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/legacy8ujsse.jar
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file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/jfxrt.jar
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file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/dnsns.jar
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file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/openjsse.jar
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file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/sunpkcs11.jar
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file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/jaccess.jar
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file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/zipfs.jar
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div></div><!--[--><!--]--></div><footer class="page-meta right-menu-padding" data-v-fdd717e0><div class="meta-item edit-link"><a class="external-link meta-item-label" href="https://github.com/alibaba/arthas/edit/master/site/docs/doc/classloader.md" rel="noopener noreferrer" target="_blank" aria-label="在 GitHub 上编辑此页"><!--[--><!--]--><span>在 GitHub 上编辑此页</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a></div><div class="meta-item last-updated"><span class="meta-item-label">Last Updated: </span><!----></div><div class="meta-item contributors"><span class="meta-item-label">贡献者: </span><span class="meta-item-info"><!--[--><!--[--><span class="contributor" title="email: hengyunabc@gmail.com">hengyunabc</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: hollowman186@vip.qq.com">Hollow Man</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: i@fatpandac.com">Fatpandac</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: lhearen@gmail.com">LHearen</span><!----><!--]--><!--]--></span></div></footer><nav class="page-nav right-menu-padding" data-v-fdd717e0><p class="inner"><span class="prev"><a href="/doc/vmtool.html" class="" aria-label="vmtool"><!--[--><!--]--> vmtool <!--[--><!--]--></a></span><span class="next"><a href="/doc/dump.html" class="" aria-label="dump"><!--[--><!--]--> dump <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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<script type="module" src="/assets/app.b8f28394.js" defer></script>
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</body>
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</html>
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