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<link rel="icon" href="/images/favicon.ico"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta property="og:title" content="Arthas"><meta property="og:image:alt" content="Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas - alibaba/arthas: Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas"><meta property="og:image" content="/images/arthas_mate_image.png"><meta property="og:description" content="Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas - alibaba/arthas: Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas"><meta property="og:image:width" content="1200"><meta property="og:image:height" content="600"><meta property="twitter:image:src" content="/images/arthas_mate_image.png"><meta property="twitter:image:alt" content="Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas - alibaba/arthas: Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas"><meta itemprop="name" content="Arthas"><meta itemprop="image" content="/images/arthas_mate_image.png"><meta itemprop="description" content="Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas - alibaba/arthas: Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas"><script>
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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-2aa8cc94><!----><span class="site-name can-hide" data-v-2aa8cc94>arthas</span><span class="navbar-version" data-v-2aa8cc94>v3.6.4</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"><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=arthas.topbar.0.0.0" rel="noopener noreferrer" target="_blank" aria-label="高可用解决方案"><!--[--><!--]--><span>高可用解决方案</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewb
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">ClassLoader</span> loader<span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">Class</span><span class="token generics"><span class="token punctuation"><</span><span class="token operator">?</span><span class="token punctuation">></span></span> clazz<span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">ArthasMethod</span> method<span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">Object</span> target<span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">Object</span><span class="token punctuation">[</span><span class="token punctuation">]</span> params<span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">Object</span> returnObj<span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">Throwable</span> throwExp<span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token keyword">boolean</span> isBefore<span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token keyword">boolean</span> isThrow<span class="token punctuation">;</span>
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<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token keyword">boolean</span> isReturn<span class="token punctuation">;</span>
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<span class="token comment">// getter/setter</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 class="line-number"></div><div class="line-number"></div></div></div><p>这里列一个表格来说明不同变量的含义</p><table><thead><tr><th style="text-align:right;">变量名</th><th style="text-align:left;">变量解释</th></tr></thead><tbody><tr><td style="text-align:right;">loader</td><td style="text-align:left;">本次调用类所在的 ClassLoader</td></tr><tr><td style="text-align:right;">clazz</td><td style="text-align:left;">本次调用类的 Class 引用</td></tr><tr><td style="text-align:right;">method</td><td style="text-align:left;">本次调用方法反射引用</td></tr><tr><td style="text-align:right;">target</td><td style="text-align:left;">本次调用类的实例</td></tr><tr><td style="text-align:right;">params</td><td style="text-align:left;">本次调用参数列表，这是一个数组，如果方法是无参方法则为空数组</td></tr><tr><td style="text-align:right;">returnObj</td><td style="text-align:left;">本次调用返回的对象。当且仅当 <code>isReturn==true</code> 成立时候有效，表明方法调用是以正常返回的方式结束。如果当前方法无返回值 <code>void</code>，则值为 null</td></tr><tr><td style="text-align:right;">throwExp</td><td style="text-align:left;">本次调用抛出的异常。当且仅当 <code>isThrow==true</code> 成立时有效，表明方法调用是以抛出异常的方式结束。</td></tr><tr><td style="text-align:right;">isBefore</td><td style="text-align:left;">辅助判断标记，当前的通知节点有可能是在方法一开始就通知，此时 <code>isBefore==true</code> 成立，同时 <code>isThrow==false</code> 和 <code>isReturn==false</code>，因为在方法刚开始时，还无法确定方法调用将会如何结束。</td></tr><tr><td style="text-align:right;">isThrow</td><td style="text-align:left;">辅助判断标记，当前的方法调用以抛异常的形式结束。</td></tr><tr><td style="text-align:right;">isReturn</td><td style="text-align:left;">辅助判断标记，当前的方法调用以正常返回的形式结束。</td></tr></tbody></table><p>所有变量都可以在表达式中直接使用，如果在表达式中编写了不符合 OGNL 脚本语法或者引入了不在表格中的变量，则退出命令的执行；用户可以根据当前的异常信息修正<code>条件表达式</code>或<code>观察表达式</code></p><ul><li>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 表达式官网：<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
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