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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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data-v-558ea87d></span></button><a href="/doc/advanced-use.md" class="sidebar-item collapsible" aria-label="其他特性" data-v-558ea87d><!--[--><!--]--> 其他特性 <!--[--><!--]--></a></div><ul style="display:none;" class="sidebar-item-children" data-v-558ea87d><!--[--><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/async.html" class="sidebar-item" aria-label="Arthas 后台异步任务" data-v-558ea87d><!--[--><!--]--> Arthas 后台异步任务 <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/save-log.html" class="sidebar-item" aria-label="执行结果存日志" data-v-558ea87d><!--[--><!--]--> 执行结果存日志 <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/docker.html" class="sidebar-item" aria-label="Docker" data-v-558ea87d><!--[--><!--]--> Docker <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/web-console.html" class="sidebar-item" aria-label="Web Console" data-v-558ea87d><!--[--><!--]--> Web Console <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/tunnel.html" class="sidebar-item" aria-label="Arthas Tunnel" data-v-558ea87d><!--[--><!--]--> Arthas Tunnel <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/idea-plugin.html" class="sidebar-item" aria-label="IDEA Plugin" data-v-558ea87d><!--[--><!--]--> IDEA Plugin <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/arthas-properties.html" class="sidebar-item" aria-label="Arthas Properties" data-v-558ea87d><!--[--><!--]--> Arthas Properties <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/agent.html" class="sidebar-item" aria-label="以 Java Agent 的方式启动" data-v-558ea87d><!--[--><!--]--> 以 Java Agent 的方式启动 <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/spring-boot-starter.html" class="sidebar-item" aria-label="Arthas Spring Boot Starter" data-v-558ea87d><!--[--><!--]--> Arthas Spring Boot Starter <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/external-command.html" class="sidebar-item" aria-label="加载外部命令" data-v-558ea87d><!--[--><!--]--> 加载外部命令 <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/http-api.html" class="sidebar-item" aria-label="Http API" data-v-558ea87d><!--[--><!--]--> Http API <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/batch-support.html" class="sidebar-item" aria-label="批处理功能" data-v-558ea87d><!--[--><!--]--> 批处理功能 <!--[--><!--]--></a></div><!----></li><!--]--></ul></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/faq.html" class="sidebar-item" aria-label="FAQ" data-v-558ea87d><!--[--><!--]--> FAQ <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/issues?q=label%3Auser-case" rel="noopener noreferrer" target="_blank" aria-label="用户案例" data-v-558ea87d><!--[--><!--]--><span>用户案例</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><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas" rel="noopener noreferrer" target="_blank" aria-label="Star me at github" data-v-558ea87d><!--[--><!--]--><span>Star me at github</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><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/blob/master/CONTRIBUTING.md" rel="noopener noreferrer" target="_blank" aria-label="编译调试/参与贡献" data-v-558ea87d><!--[--><!--]--><span>编译调试/参与贡献</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><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/releases" rel="noopener noreferrer" target="_blank" aria-label="Release Notes" data-v-558ea87d><!--[--><!--]--><span>Release Notes</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><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/contact-us.md" class="sidebar-item" aria-label="QQ 群/钉钉群" data-v-558ea87d><!--[--><!--]--> QQ 群/钉钉群 <!--[--><!--]--></a></div><!----></li><!--]--></ul></li><!--]--></ul><!--]--><!--[--><!--]--></aside><!--]--><!--[--><main class="page" data-v-fdd717e0><!--[--><!--]--><div class="right-menu-padding theme-default-content" data-v-fdd717e0><!--[--><!--]--><div class="right-menu-wrapper" data-v-fdd717e0 data-v-64666cd5><div class="right-menu-margin" data-v-64666cd5><div class="right-menu-title" data-v-64666cd5>目录</div><div class="right-menu-content" data-v-64666cd5><!--[--><!--]--></div></div></div><div data-v-fdd717e0><h1 id="dump" tabindex="-1"><a class="header-anchor" href="#dump" aria-hidden="true">#</a> dump</h1><p><a href="https://arthas.aliyun.com/doc/arthas-tutorials?language=cn&id=command-dump" target="_blank" rel="noopener noreferrer"><code>dump</code>在线教程<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></p><div class="custom-container tip"><p class="custom-container-title">提示</p><p>dump 已加载类的 bytecode 到特定目录</p></div><p>dump 命令将 JVM 中实际运行的 class 的 byte code dump 到指定目录,适用场景批量下载指定包目录的 class 字节码;如需反编译单一类、实时查看类信息,可参考 <a href="/doc/jad.html" class="">jad</a>。</p><h2 id="参数说明" tabindex="-1"><a class="header-anchor" href="#参数说明" aria-hidden="true">#</a> 参数说明</h2><table><thead><tr><th style="text-align:right;">参数名称</th><th style="text-align:left;">参数说明</th></tr></thead><tbody><tr><td style="text-align:right;"><em>class-pattern</em></td><td style="text-align:left;">类名表达式匹配</td></tr><tr><td style="text-align:right;"><code>[c:]</code></td><td style="text-align:left;">类所属 ClassLoader 的 hashcode</td></tr><tr><td style="text-align:right;"><code>[classLoaderClass:]</code></td><td style="text-align:left;">指定执行表达式的 ClassLoader 的 class name</td></tr><tr><td style="text-align:right;"><code>[d:]</code></td><td style="text-align:left;">设置类文件的目标目录</td></tr><tr><td style="text-align:right;">[E]</td><td style="text-align:left;">开启正则表达式匹配,默认为通配符匹配</td></tr></tbody></table><h2 id="使用参考" tabindex="-1"><a class="header-anchor" href="#使用参考" aria-hidden="true">#</a> 使用参考</h2><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ dump java.lang.String
|
||
HASHCODE CLASSLOADER LOCATION
|
||
null /Users/admin/logs/arthas/classdump/java/lang/String.class
|
||
Affect<span class="token punctuation">(</span>row-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">119</span> ms.
|
||
</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><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ dump demo.*
|
||
HASHCODE CLASSLOADER LOCATION
|
||
3d4eac69 +-sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@3d4eac69 /Users/admin/logs/arthas/classdump/sun.misc.Launcher<span class="token variable">$AppClassLoader</span>-3d4eac69/demo/MathGame.class
|
||
+-sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@66350f69
|
||
Affect<span class="token punctuation">(</span>row-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">39</span> ms.
|
||
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ dump <span class="token parameter variable">-d</span> /tmp/output java.lang.String
|
||
HASHCODE CLASSLOADER LOCATION
|
||
null /tmp/output/java/lang/String.class
|
||
Affect<span class="token punctuation">(</span>row-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">138</span> ms.
|
||
</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><ul><li>指定 classLoader</li></ul><p>注意 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>如果你使用<code>-c</code>,你需要手动输入 hashcode:<code>-c <hashcode></code></p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ dump <span class="token parameter variable">-c</span> 3d4eac69 demo.*
|
||
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>对于只有唯一实例的 ClassLoader 可以通过<code>--classLoaderClass</code>指定 class name,使用起来更加方便:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ dump <span class="token parameter variable">--classLoaderClass</span> sun.misc.Launcher<span class="token variable">$AppClassLoader</span> demo.*
|
||
HASHCODE CLASSLOADER LOCATION
|
||
3d4eac69 +-sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@3d4eac69 /Users/admin/logs/arthas/classdump/sun.misc.Launcher<span class="token variable">$AppClassLoader</span>-3d4eac69/demo/MathGame.class
|
||
+-sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@66350f69
|
||
Affect<span class="token punctuation">(</span>row-cnt:1<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">39</span> ms.
|
||
</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><ul><li>注:这里 classLoaderClass 在 java 8 是 sun.misc.Launcher$AppClassLoader,而 java 11 的 classloader 是 jdk.internal.loader.ClassLoaders$AppClassLoader,killercoda 目前环境是 java11。</li></ul><p><code>--classLoaderClass</code> 的值是 ClassLoader 的类名,只有匹配到唯一的 ClassLoader 实例时才能工作,目的是方便输入通用命令,而<code>-c <hashcode></code>是动态变化的。</p></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/dump.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: hollowman@hollowman.ml">Hollow Man</span><!----><!--]--><!--]--></span></div></footer><nav class="page-nav right-menu-padding" data-v-fdd717e0><p class="inner"><span class="prev"><a href="/doc/dashboard.html" class="" aria-label="dashboard"><!--[--><!--]--> dashboard <!--[--><!--]--></a></span><span class="next"><a href="/doc/echo.html" class="" aria-label="echo"><!--[--><!--]--> echo <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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<script type="module" src="/assets/app.524ecf5c.js" defer></script>
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</body>
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</html>
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