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<div class="section" id="getstatic">
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<h1>getstatic<a class="headerlink" href="#getstatic" title="Permalink to this headline">¶</a></h1>
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<p><a class="reference external" href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=en&id=command-getstatic"><code class="docutils literal notranslate"><span class="pre">getstatic</span></code> online tutorial</a></p>
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<ul class="simple">
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<li><p>It is recommended to use the [OGNL] (ognl.md) command, which will be more flexible.</p></li>
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</ul>
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<p>Check the static fields of classes conveniently, the usage is <code class="docutils literal notranslate"><span class="pre">getstatic</span> <span class="pre">class_name</span> <span class="pre">field_name</span></code>.</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ getstatic demo.MathGame random
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field: random
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@Random[
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serialVersionUID=@Long[3905348978240129619],
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seed=@AtomicLong[120955813885284],
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multiplier=@Long[25214903917],
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addend=@Long[11],
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mask=@Long[281474976710655],
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DOUBLE_UNIT=@Double[1.1102230246251565E-16],
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BadBound=@String[bound must be positive],
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BadRange=@String[bound must be greater than origin],
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BadSize=@String[size must be non-negative],
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seedUniquifier=@AtomicLong[-3282039941672302964],
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nextNextGaussian=@Double[0.0],
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haveNextNextGaussian=@Boolean[false],
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serialPersistentFields=@ObjectStreamField[][isEmpty=false;size=3],
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unsafe=@Unsafe[sun.misc.Unsafe@2eaa1027],
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seedOffset=@Long[24],
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]</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 using <code class="docutils literal notranslate"><span class="pre">sc</span> <span class="pre">-d</span> <span class="pre"><ClassName></span></code>.</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">$ getstatic -c 3d4eac69 demo.MathGame random</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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<p><code class="docutils literal notranslate"><span class="pre">getstatic</span> <span class="pre">--classLoaderClass</span> <span class="pre">demo.MathGame</span> <span class="pre">random</span></code></p>
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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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<p>Tip: if the static field is a complex class, you can even use <a class="reference external" href="https://commons.apache.org/proper/commons-ognl/language-guide.html"><code class="docutils literal notranslate"><span class="pre">OGNL</span></code></a> to traverse, filter and access the inner properties of this class.</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://commons.apache.org/proper/commons-ognl/language-guide.html">OGNL official guide</a></li>
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<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues/71">Special usages</a></li>
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</ul>
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</div>
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<p>E.g. suppose <code class="docutils literal notranslate"><span class="pre">n</span></code> is a <code class="docutils literal notranslate"><span class="pre">Map</span></code> and its key is a <code class="docutils literal notranslate"><span class="pre">Enum</span></code>, then you can achieve this if you want to pick the key with a specific <code class="docutils literal notranslate"><span class="pre">Enum</span></code> value:</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ getstatic com.alibaba.arthas.Test n 'entrySet().iterator.{? #this.key.name()=="STOP"}'
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field: n
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@ArrayList[
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@Node[STOP=bbb],
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]
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Affect(row-cnt:1) cost in 68 ms.
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$ getstatic com.alibaba.arthas.Test m 'entrySet().iterator.{? #this.key=="a"}'
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field: m
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@ArrayList[
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@Node[a=aaa],
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]</pre></div>
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