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<div class="section" id="dump">
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<h1>dump<a class="headerlink" href="#dump" title="Permalink to this headline">¶</a></h1>
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<p><a class="reference external" href="https://arthas.aliyun.com/doc/arthas-tutorials?language=en&id=command-dump"><code class="docutils literal notranslate"><span class="pre">dump</span></code> online tutorial</a></p>
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<blockquote>
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<div><p>Dump the bytecode for the particular classes to the specified directory.</p>
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</div></blockquote>
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<div class="section" id="options">
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<h2>Options<a class="headerlink" href="#options" title="Permalink to this headline">¶</a></h2>
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<table border="1" class="docutils">
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<thead>
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<tr>
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<th align="right">Name</th>
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<th align="left">Specification</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td align="right"><em>class-pattern</em></td>
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<td align="left">class name pattern</td>
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</tr>
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<tr>
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<td align="right"><code>[c:]</code></td>
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<td align="left">hashcode of the <a href="classloader.md">class loader</a> that loaded the target class</td>
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</tr>
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<tr>
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<td align="right"><code>[classLoaderClass:]</code></td>
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<td align="left">The class name of the ClassLoader that executes the expression.</td>
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</tr>
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<tr>
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<td align="right"><code>[d:]</code></td>
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<td align="left">set the destination directory for class files</td>
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</tr>
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<tr>
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<td align="right"><code>[E]</code></td>
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<td align="left">turn on regex match, the default behavior is wild card match</td>
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</tr>
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</tbody>
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</table></div>
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<div class="section" id="usage">
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<h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ dump java.lang.String
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HASHCODE CLASSLOADER LOCATION
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null /Users/admin/logs/arthas/classdump/java/lang/String.class
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Affect(row-cnt:1) cost in 119 ms.</pre></div>
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</div>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ dump demo.*
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HASHCODE CLASSLOADER LOCATION
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3d4eac69 +-sun.misc.Launcher$AppClassLoader@3d4eac69 /Users/admin/logs/arthas/classdump/sun.misc.Launcher$AppClassLoader-3d4eac69/demo/MathGame.class
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+-sun.misc.Launcher$ExtClassLoader@66350f69
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Affect(row-cnt:1) cost in 39 ms.</pre></div>
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</div>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ dump -d /tmp/output java.lang.String
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HASHCODE CLASSLOADER LOCATION
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null /tmp/output/java/lang/String.class
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Affect(row-cnt:1) cost in 138 ms.</pre></div>
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</div>
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<ul class="simple">
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<li><p>Specify classLoader</p></li>
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</ul>
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<p>Note that the hashcode changes, you need to check the current ClassLoader information first, and extract the hashcode corresponding to the ClassLoader.</p>
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<p>if you use<code class="docutils literal notranslate"><span class="pre">-c</span></code>, you have to manually type hashcode by <code class="docutils literal notranslate"><span class="pre">-c</span> <span class="pre"><hashcode></span></code>.</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ dump -c 3d4eac69 demo.*</pre></div>
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</div>
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<p>For classloader with only one instance, it can be specified by <code class="docutils literal notranslate"><span class="pre">--classLoaderClass</span></code> using class name, which is more convenient to use.</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ dump --classLoaderClass sun.misc.Launcher$AppClassLoader demo.*
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HASHCODE CLASSLOADER LOCATION
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3d4eac69 +-sun.misc.Launcher$AppClassLoader@3d4eac69 /Users/admin/logs/arthas/classdump/sun.misc.Launcher$AppClassLoader-3d4eac69/demo/MathGame.class
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+-sun.misc.Launcher$ExtClassLoader@66350f69
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Affect(row-cnt:1) cost in 39 ms.</pre></div>
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</div>
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<ul class="simple">
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<li><p>PS: Here the classLoaderClass in java 8 is sun.misc.Launcher$AppClassLoader, while in java 11 it’s jdk.internal.loader.ClassLoaders$AppClassLoader. Currently katacoda using java 8.</p></li>
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</ul>
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<p>The value of <code class="docutils literal notranslate"><span class="pre">--classloaderclass</span></code> is the class name of classloader. It can only work when it matches a unique classloader instance. The purpose is to facilitate the input of general commands. However, <code class="docutils literal notranslate"><span class="pre">-c</span> <span class="pre"><hashcode></span></code> is dynamic.</p>
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