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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>v3.7.0</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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@String<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span>
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@String<span class="token punctuation">[</span>com/taobao/arthas/core/shell/session/Session<span class="token punctuation">]</span>,
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@String<span class="token punctuation">[</span>com.taobao.arthas.core.shell.session.Session<span class="token punctuation">]</span>,
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@String<span class="token punctuation">[</span>com/taobao/arthas/core/shell/session/Session<span class="token punctuation">]</span>,
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@String<span class="token punctuation">[</span>com/taobao/arthas/core/shell/session/Session<span class="token punctuation">]</span>,
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@String<span class="token punctuation">[</span>com/taobao/arthas/core/shell/session/Session.class<span class="token punctuation">]</span>,
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@String<span class="token punctuation">[</span>com/taobao/arthas/core/shell/session/Session.class<span class="token punctuation">]</span>,
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@String<span class="token punctuation">[</span>com/taobao/arthas/core/shell/session/Session.class<span class="token punctuation">]</span>,
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@String<span class="token punctuation">[</span>com/<span class="token punctuation">]</span>,
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@String<span class="token punctuation">[</span>java/util/concurrent/ConcurrentHashMap<span class="token variable">$ValueIterator</span><span class="token punctuation">]</span>,
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@String<span class="token punctuation">[</span>java/util/concurrent/locks/LockSupport<span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><div class="custom-container tip"><p class="custom-container-title">提示</p><p>通过 <code>--limit</code>参数，可以限制返回值数量，避免获取超大数据时对 JVM 造成压力。默认值是 10。</p></div><h2 id="指定-classloader-name" tabindex="-1"><a class="header-anchor" href="#指定-classloader-name" aria-hidden="true">#</a> 指定 classloader name</h2><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>vmtool <span class="token parameter variable">--action</span> getInstances <span class="token parameter variable">--classLoaderClass</span> org.springframework.boot.loader.LaunchedURLClassLoader <span class="token parameter variable">--className</span> org.springframework.context.ApplicationContext
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="指定-classloader-hash" tabindex="-1"><a class="header-anchor" href="#指定-classloader-hash" aria-hidden="true">#</a> 指定 classloader hash</h2><p>可以通过<code>sc</code>命令查找到加载 class 的 classloader。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ sc <span class="token parameter variable">-d</span> org.springframework.context.ApplicationContext
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class-info org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext
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code-source file:/private/tmp/demo-arthas-spring-boot.jar<span class="token operator">!</span>/BOOT-INF/lib/spring-boot-1.5.13.RELEASE.jar<span class="token operator">!</span>/
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name org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext
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<span class="token punctuation">..</span>.
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class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2
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+-sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@75b84c92
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+-sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@4f023edb
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classLoaderHash 19469ea2
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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></div><p>然后用<code>-c</code>/<code>--classloader</code> 参数指定：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>vmtool <span class="token parameter variable">--action</span> getInstances <span class="token parameter variable">-c</span> 19469ea2 <span class="token parameter variable">--className</span> org.springframework.context.ApplicationContext
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="指定返回结果展开层数" tabindex="-1"><a class="header-anchor" href="#指定返回结果展开层数" aria-hidden="true">#</a> 指定返回结果展开层数</h2><div class="custom-container tip"><p class="custom-container-title">提示</p><p><code>getInstances</code> action 返回结果绑定到<code>instances</code>变量上，它是数组。</p><p>通过 <code>-x</code>/<code>--expand</code> 参数可以指定结果的展开层次，默认值是 1。</p></div><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>vmtool <span class="token parameter variable">--action</span> getInstances <span class="token parameter variable">-c</span> 19469ea2 <span class="token parameter variable">--className</span> org.springframework.context.ApplicationContext <span class="token parameter variable">-x</span> <span class="token number">2</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="执行表达式" tabindex="-1"><a class="header-anchor" href="#执行表达式" aria-hidden="true">#</a> 执行表达式</h2><div class="custom-container tip"><p class="custom-container-title">提示</p><p><code>getInstances</code> action 返回结果绑定到<code>instances</code>变量上，它是数组。可以通过<code>--express</code>参数执行指定的表达式。</p></div><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>vmtool <span class="token parameter variable">--action</span> getInstances <span class="token parameter variable">--classLoaderClass</span> org.springframework.boot.loader.LaunchedURLClassLoader <span class="token parameter variable">--className</span> org.springframework.context.ApplicationContext <span class="token parameter variable">--express</span> <span class="token string">'instances[0].getBeanDefinitionNames()'</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="强制-gc" tabindex="-1"><a class="header-anchor" href="#强制-gc" aria-hidden="true">#</a> 强制 GC</h2><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>vmtool <span class="token parameter variable">--action</span> forceGc
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>可以结合 <a href="/doc/vmoption.html" class=""><code>vmoption</code></a> 命令动态打开<code>PrintGC</code>开关。</li></ul><h2 id="interrupt-指定线程" tabindex="-1"><a class="header-anchor" href="#interrupt-指定线程" aria-hidden="true">#</a> interrupt 指定线程</h2><p>thread id 通过<code>-t</code>参数指定，可以使用 <code>thread</code>命令获取。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>vmtool <span class="token parameter variable">--action</span> interruptThread <span class="token parameter variable">-t</span> <span class="token number">1</span>
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