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<div class="section" id="vmtool">
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<h1>vmtool<a class="headerlink" href="#vmtool" title="Permalink to this headline">¶</a></h1>
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<blockquote>
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<div><p>@since 3.5.1
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<a class="reference external" href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=en&id=command-vmtool"><code class="docutils literal notranslate"><span class="pre">vmtool</span></code> online tutorial</a></p>
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</div></blockquote>
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<p><code class="docutils literal notranslate"><span class="pre">vmtool</span></code> uses the <code class="docutils literal notranslate"><span class="pre">JVMTI</span></code> to support <code class="docutils literal notranslate"><span class="pre">getInstances</span></code> in jvm and <code class="docutils literal notranslate"><span class="pre">forceGc</span></code>.</p>
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<div class="toctree-wrapper compound">
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<ul>
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<li class="toctree-l1"><a class="reference external" href="https://docs.oracle.com/javase/8/docs/platform/jvmti/jvmti.html">JVM Tool Interface</a></li>
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</ul>
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</div>
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<div class="section" id="getinstances">
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<h2>getInstances<a class="headerlink" href="#getinstances" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ vmtool --action getInstances --className java.lang.String --limit 10
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@String[][
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@String[com/taobao/arthas/core/shell/session/Session],
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@String[com.taobao.arthas.core.shell.session.Session],
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@String[com/taobao/arthas/core/shell/session/Session],
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@String[com/taobao/arthas/core/shell/session/Session],
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@String[com/taobao/arthas/core/shell/session/Session.class],
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@String[com/taobao/arthas/core/shell/session/Session.class],
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@String[com/taobao/arthas/core/shell/session/Session.class],
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@String[com/],
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@String[java/util/concurrent/ConcurrentHashMap$ValueIterator],
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@String[java/util/concurrent/locks/LockSupport],
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]</pre></div>
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</div>
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<blockquote>
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<div><p>Through the <code class="docutils literal notranslate"><span class="pre">--limit</span></code> parameter, you can limit the number of return values to avoid pressure on the JVM when obtaining large data. The default value of limit is 10.</p>
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</div></blockquote>
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</div>
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<div class="section" id="specify-classloader-name">
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<h2>Specify classloader name<a class="headerlink" href="#specify-classloader-name" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">vmtool --action getInstances --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --className org.springframework.context.ApplicationContext</pre></div>
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</div>
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</div>
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<div class="section" id="specify-classloader-hash">
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<h2>Specify classloader hash<a class="headerlink" href="#specify-classloader-hash" title="Permalink to this headline">¶</a></h2>
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<p>The classloader that loads the class can be found through the <code class="docutils literal notranslate"><span class="pre">sc</span></code> command.</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ sc -d 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!/BOOT-INF/lib/spring-boot-1.5.13.RELEASE.jar!/
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name org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext
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...
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class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@19469ea2
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+-sun.misc.Launcher$AppClassLoader@75b84c92
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+-sun.misc.Launcher$ExtClassLoader@4f023edb
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classLoaderHash 19469ea2</pre></div>
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</div>
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<p>Then use the <code class="docutils literal notranslate"><span class="pre">-c</span></code>/<code class="docutils literal notranslate"><span class="pre">--classloader</span></code> parameter to specify:</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">vmtool --action getInstances -c 19469ea2 --className org.springframework.context.ApplicationContext</pre></div>
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</div>
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</div>
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<div class="section" id="specify-the-number-of-expanded-layers-of-returned-results">
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<h2>Specify the number of expanded layers of returned results<a class="headerlink" href="#specify-the-number-of-expanded-layers-of-returned-results" title="Permalink to this headline">¶</a></h2>
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<blockquote>
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<div><p>The return result of the <code class="docutils literal notranslate"><span class="pre">getInstances</span></code> action is bound to the <code class="docutils literal notranslate"><span class="pre">instances</span></code> variable, which is an array.</p>
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</div></blockquote>
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<blockquote>
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<div><p>The expansion level of the result can be specified by the <code class="docutils literal notranslate"><span class="pre">-x</span></code>/<code class="docutils literal notranslate"><span class="pre">--expand</span></code> parameter, the default value is 1.</p>
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</div></blockquote>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">vmtool --action getInstances -c 19469ea2 --className org.springframework.context.ApplicationContext -x 2</pre></div>
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</div>
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</div>
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<div class="section" id="execute-expression">
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<h2>Execute expression<a class="headerlink" href="#execute-expression" title="Permalink to this headline">¶</a></h2>
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<blockquote>
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<div><p>The return result of the <code class="docutils literal notranslate"><span class="pre">getInstances</span></code> action is bound to the <code class="docutils literal notranslate"><span class="pre">instances</span></code> variable, which is an array. The specified expression can be executed through the <code class="docutils literal notranslate"><span class="pre">--express</span></code> parameter.</p>
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</div></blockquote>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">vmtool --action getInstances --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader --className org.springframework.context.ApplicationContext --express'instances[0].getBeanDefinitionNames()'</pre></div>
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</div>
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</div>
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<div class="section" id="force-gc">
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<h2>Force GC<a class="headerlink" href="#force-gc" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">vmtool --action forceGc</pre></div>
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</div>
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<ul class="simple">
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<li><p>Use the <a class="reference internal" href="vmoption.html"><span class="doc">vmoption</span></a> command to dynamically turn on the <code class="docutils literal notranslate"><span class="pre">PrintGC</span></code> option.</p></li>
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</ul>
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