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href="/doc/contact-us.md" class="sidebar-item" aria-label="QQ群/钉钉群"><!--[--><!--]--> QQ群/钉钉群 <!--[--><!--]--></a><!----></li><!--]--></ul></li><!--]--></ul><!--[--><!--]--></aside><!--]--><!--[--><main class="page" data-v-e0e60120><!--[--><!--]--><div class="theme-default-content" data-v-e0e60120><!--[--><!--]--><!----><div data-v-e0e60120><h1 id="getstatic" tabindex="-1"><a class="header-anchor" href="#getstatic" aria-hidden="true">#</a> getstatic</h1><p><a href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&amp;id=command-getstatic" target="_blank" rel="noopener noreferrer"><code>getstatic</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><ul><li>推荐直接使用<a href="/doc/ognl.html" class="">ognl</a>命令,更加灵活。</li></ul><p>通过 getstatic 命令可以方便的查看类的静态属性。使用方法为<code>getstatic class_name field_name</code></p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ getstatic demo.MathGame random
field: random
@Random<span class="token punctuation">[</span>
<span class="token assign-left variable">serialVersionUID</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">3905348978240129619</span><span class="token punctuation">]</span>,
<span class="token assign-left variable">seed</span><span class="token operator">=</span>@AtomicLong<span class="token punctuation">[</span><span class="token number">120955813885284</span><span class="token punctuation">]</span>,
<span class="token assign-left variable">multiplier</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">25214903917</span><span class="token punctuation">]</span>,
<span class="token assign-left variable">addend</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">11</span><span class="token punctuation">]</span>,
<span class="token assign-left variable">mask</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">281474976710655</span><span class="token punctuation">]</span>,
<span class="token assign-left variable">DOUBLE_UNIT</span><span class="token operator">=</span>@Double<span class="token punctuation">[</span><span class="token number">1</span>.1102230246251565E-16<span class="token punctuation">]</span>,
<span class="token assign-left variable">BadBound</span><span class="token operator">=</span>@String<span class="token punctuation">[</span>bound must be positive<span class="token punctuation">]</span>,
<span class="token assign-left variable">BadRange</span><span class="token operator">=</span>@String<span class="token punctuation">[</span>bound must be greater than origin<span class="token punctuation">]</span>,
<span class="token assign-left variable">BadSize</span><span class="token operator">=</span>@String<span class="token punctuation">[</span>size must be non-negative<span class="token punctuation">]</span>,
<span class="token assign-left variable">seedUniquifier</span><span class="token operator">=</span>@AtomicLong<span class="token punctuation">[</span>-3282039941672302964<span class="token punctuation">]</span>,
<span class="token assign-left variable">nextNextGaussian</span><span class="token operator">=</span>@Double<span class="token punctuation">[</span><span class="token number">0.0</span><span class="token punctuation">]</span>,
<span class="token assign-left variable">haveNextNextGaussian</span><span class="token operator">=</span>@Boolean<span class="token punctuation">[</span>false<span class="token punctuation">]</span>,
<span class="token assign-left variable">serialPersistentFields</span><span class="token operator">=</span>@ObjectStreamField<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span>isEmpty<span class="token operator">=</span>false<span class="token punctuation">;</span><span class="token assign-left variable">size</span><span class="token operator">=</span><span class="token number">3</span><span class="token punctuation">]</span>,
<span class="token assign-left variable">unsafe</span><span class="token operator">=</span>@Unsafe<span class="token punctuation">[</span>sun.misc.Unsafe@2eaa1027<span class="token punctuation">]</span>,
<span class="token assign-left variable">seedOffset</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">24</span><span class="token punctuation">]</span>,
<span class="token punctuation">]</span>
</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 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><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,使用<code>sc -d &lt;ClassName&gt;</code>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 &lt;hashcode&gt;</code></p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ getstatic -c 3d4eac69 demo.MathGame random
</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><p><code>getstatic --classLoaderClass sun.misc.Launcher$AppClassLoader demo.MathGame random</code></p><ul><li>注: 这里 classLoaderClass 在 java 8 是 sun.misc.Launcher$AppClassLoader而java 11的classloader是jdk.internal.loader.ClassLoaders$AppClassLoaderkatacoda 目前环境是 java8。</li></ul><p><code>--classLoaderClass</code> 的值是 ClassLoader 的类名,只有匹配到唯一的 ClassLoader 实例时才能工作,目的是方便输入通用命令,而<code>-c &lt;hashcode&gt;</code>是动态变化的。</p><p>如果该静态属性是一个复杂对象,还可以支持在该属性上通过 ognl 表示进行遍历,过滤,访问对象的内部属性等操作。</p><ul><li>OGNL 特殊用法请参考:<a href="https://github.com/alibaba/arthas/issues/71" target="_blank" rel="noopener noreferrer">https://github.com/alibaba/arthas/issues/71<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a></li><li>OGNL 表达式官方指南:<a href="https://commons.apache.org/proper/commons-ognl/language-guide.html" target="_blank" rel="noopener noreferrer">https://commons.apache.org/proper/commons-ognl/language-guide.html<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a></li></ul><p>例如,假设 n 是一个 MapMap 的 Key 是一个 Enum我们想过滤出 Map 中 Key 为某个 Enum 的值,可以写如下命令</p><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ getstatic com.alibaba.arthas.Test n &#39;entrySet().iterator.{? #this.key.name()==&quot;STOP&quot;}&#39;
field: n
@ArrayList[
@Node[STOP=bbb],
]
Affect(row-cnt:1) cost in 68 ms.
$ getstatic com.alibaba.arthas.Test m &#39;entrySet().iterator.{? #this.key==&quot;a&quot;}&#39;
field: m
@ArrayList[
@Node[a=aaa],
]
</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><!--[--><!--]--></div><footer class="page-meta" data-v-e0e60120><div class="meta-item edit-link"><a class="external-link meta-item-label" href="https://github.com/alibaba/arthas/edit/master/site/docs/doc/getstatic.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><!----><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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