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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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</script><meta name="aes-config" content="pid=xux-opensource&user_type=101&uid=&username=&dim10=arthas"><script src="//g.alicdn.com/alilog/mlog/aplus_v2.js" id="beacon-aplus" exparams="clog=o&aplus&sidx=aplusSidx&ckx=aplusCkx"></script><script src="//g.alicdn.com/aes/??tracker/1.0.34/index.js,tracker-plugin-pv/2.4.5/index.js,tracker-plugin-event/1.2.5/index.js,tracker-plugin-jserror/1.0.13/index.js,tracker-plugin-api/1.1.14/index.js,tracker-plugin-perf/1.1.8/index.js,tracker-plugin-eventTiming/1.0.4/index.js"></script><title>arthas 观察方法中的某个变量的值 | arthas</title><meta name="description" content="要使用Arthas观察方法中的某个变量的值，可以遵循以下步骤：1. **确定观察目标**：首先，你需要明确想要观察的Java类和方法名，例如在上述示例中，观察的目标是`demo.MathGame`类的`primeFactors`方法。2. **启动Arthas**：确保你的Java应用正在运行，并通">
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aria-label="arthas方法运行后查看成员变量"><!--[--><!--]--> arthas方法运行后查看成员变量 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14843.html" class="sidebar-item" aria-label="arthas 支持jdk 20么？"><!--[--><!--]--> arthas 支持jdk 20么？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15737.html" class="sidebar-item" aria-label="进程停了 arthas也会同步停止么？"><!--[--><!--]--> 进程停了 arthas也会同步停止么？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11450.html" class="sidebar-item" aria-label="arthas 分析thread线程卡住"><!--[--><!--]--> arthas 分析thread线程卡住 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11795.html" class="sidebar-item" aria-label="使用arthas查看成员变量值具体怎么做？"><!--[--><!--]--> 使用arthas查看成员变量值具体怎么做？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12740.html" class="sidebar-item" aria-label="arthas怎么分析cpu很高"><!--[--><!--]--> arthas怎么分析cpu很高 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13512.html" class="sidebar-item" aria-label="如何查看java内存增长哪些对象"><!--[--><!--]--> 如何查看java内存增长哪些对象 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15167.html" class="sidebar-item" aria-label="介绍一下arthas"><!--[--><!--]--> 介绍一下arthas <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15738.html" class="sidebar-item" aria-label="arthas如何查看hashmap的值"><!--[--><!--]--> arthas如何查看hashmap的值 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11451.html" class="sidebar-item" aria-label="arthas 怎么排查cpu占用过高？"><!--[--><!--]--> arthas 怎么排查cpu占用过高？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11809.html" class="sidebar-item" aria-label="linux下的arthas 具体怎么用？（使用教程）"><!--[--><!--]--> linux下的arthas 具体怎么用？（使用教程） <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12741.html" class="sidebar-item" aria-label="如何使用arthas查看系统哪个地方内存占用过大"><!--[--><!--]--> 如何使用arthas查看系统哪个地方内存占用过大 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13513.html" class="sidebar-item" aria-label="arthas 监听成员变量值的方法是什么？"><!--[--><!--]--> arthas 监听成员变量值的方法是什么？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15543.html" class="sidebar-item" aria-label="arthas中tt命令如何查看方法入参的具体命令"><!--[--><!--]--> arthas中tt命令如何查看方法入参的具体命令 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15739.html" class="sidebar-item" aria-label="arthas可以监听私有方法吗"><!--[--><!--]--> arthas可以监听私有方法吗 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11452.html" class="sidebar-item" aria-label="arthas 查看方法耗时"><!--[--><!--]--> arthas 查看方法耗时 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11810.html" class="sidebar-item" aria-label="arthas查看方法耗时"><!--[--><!--]--> arthas查看方法耗时 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13448.html" class="sidebar-item" aria-label="如何使用arthas分析慢查询"><!--[--><!--]--> 如何使用arthas分析慢查询 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13522.html" class="sidebar-item" aria-label="Connect to telnet server error: 127.0.0.1 3658"><!--[--><!--]--> Connect to telnet server error: 127.0.0.1 3658 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15726.html" class="sidebar-item" aria-label="arthas 如何查询static变量"><!--[--><!--]--> arthas 如何查询static变量 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15740.html" class="sidebar-item" aria-label="arthas 分析内存身高的方法"><!--[--><!--]--> arthas 分析内存身高的方法 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11453.html" class="sidebar-item" aria-label="arthas 怎样查看方法耗时"><!--[--><!--]--> arthas 怎样查看方法耗时 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11814.html" class="sidebar-item" aria-label="arthas 怎么排查内存泄漏"><!--[--><!--]--> arthas 怎么排查内存泄漏 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13504.html" class="sidebar-item" aria-label="如何查看实时jvm内存大小占用"><!--[--><!--]--> 如何查看实时jvm内存大小占用 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14763.html" class="sidebar-item" aria-label="利用Arthas排查NoSuchMethodError"><!--[--><!--]--> 利用Arthas排查NoSuchMethodError <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15728.html" class="sidebar-item" aria-label="arthas 获取成员变量"><!--[--><!--]--> arthas 获取成员变量 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11454.html" class="sidebar-item" aria-label="arthas 常用命令介绍"><!--[--><!--]--> arthas 常用命令介绍 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12453.html" class="sidebar-item" aria-label="artahs 怎么查看内存情况？"><!--[--><!--]--> artahs 怎么查看内存情况？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13506.html" class="sidebar-item" aria-label="如何查看java内存增长哪些对象"><!--[--><!--]--> 如何查看java内存增长哪些对象 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14831.html" class="sidebar-item" aria-label="Dashboard 命令cpuUsage长期在90%左右"><!--[--><!--]--> Dashboard 命令cpuUsage长期在90%左右 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15729.html" class="sidebar-item" aria-label="arthas 怎么查看变量内容"><!--[--><!--]--> arthas 怎么查看变量内容 <!--[--><!--]--></a><!----></li><!--]--></ul></li><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/issues?q=label%3Auser-case" rel="noopener noreferrer" target="_blank" aria-label="用户案例"><!--[--><!--]--><span>用户案例</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 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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><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/blob/master/CONTRIBUTING.md" rel="noopener noreferrer" target="_blank" aria-label="编译调试/参与贡献"><!--[--><!--]--><span>编译调试/参与贡献</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><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/releases" rel="noopener noreferrer" target="_blank" aria-label="Release Notes"><!--[--><!--]--><span>Release Notes</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><a 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-fdd717e0><!--[--><!--]--><div class="right-menu-padding theme-default-content" data-v-fdd717e0><!--[--><!--]--><div class="right-menu-wrapper" data-v-fdd717e0 data-v-64666cd5><div class="right-menu-margin" data-v-64666cd5><div class="right-menu-title" data-v-64666cd5>目录</div><div class="right-menu-content" data-v-64666cd5><!--[--><!--]--></div></div></div><div data-v-fdd717e0><h2 id="用户问题" tabindex="-1"><a class="header-anchor" href="#用户问题" aria-hidden="true">#</a> 用户问题 ：</h2><p>arthas 观察方法中的某个变量的值</p><hr><h2 id="专家官方解答" tabindex="-1"><a class="header-anchor" href="#专家官方解答" aria-hidden="true">#</a> 专家官方解答 ：</h2><p>要使用Arthas观察方法中的某个变量的值，可以遵循以下步骤：</p><ol><li><p><strong>确定观察目标</strong>：首先，你需要明确想要观察的Java类和方法名，例如在上述示例中，观察的目标是<code>demo.MathGame</code>类的<code>primeFactors</code>方法。</p></li><li><p><strong>启动Arthas</strong>：确保你的Java应用正在运行，并通过命令行工具连接到该Java进程。可以通过<code>java -jar arthas-boot.jar</code>命令启动Arthas，然后选择对应的进程进行连接。</p></li><li><p><strong>使用<code>watch</code>命令</strong>：利用Arthas的<code>watch</code>命令来观察方法的执行情况及内部变量。基本语法为：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token function">watch</span> <span class="token punctuation">[</span>类名<span class="token punctuation">]</span> <span class="token punctuation">[</span>方法名<span class="token punctuation">]</span> <span class="token punctuation">[</span>观察表达式<span class="token punctuation">]</span> <span class="token punctuation">[</span>-x 遍历深度<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>其中，观察表达式可以用来指定你关心的变量。如果想直接观察所有参数、方法内的<code>this</code>对象以及返回值，可以使用默认的观察表达式<code>{params, target, returnObj}</code>。</p></li><li><p><strong>指定变量观察</strong>：如果你想观察方法内特定变量的值，可以在观察表达式中直接使用变量名。例如，若想知道<code>primeFactors</code>方法内部<code>illegalArgumentCount</code>变量的变化，可以这样操作：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token function">watch</span> demo.MathGame primeFactors <span class="token string">'target.illegalArgumentCount'</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>这里<code>target</code>代表方法内的<code>this</code>对象，<code>.illegalArgumentCount</code>即为你关心的变量名。</p></li><li><p><strong>调整遍历深度（可选）</strong>：使用<code>-x</code>参数可以调整观察结果的详细程度，即对象内部结构的展开层级。默认遍历深度为1，最大为4。根据需要，你可以调整这个值来获取更详尽或简化的输出。例如：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token function">watch</span> demo.MathGame primeFactors <span class="token string">'target.illegalArgumentCount'</span> <span class="token parameter variable">-x</span> <span class="token number">2</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div></li><li><p><strong>解读结果</strong>：执行上述命令后，Arthas会监听指定方法的调用，并在控制台输出每次调用时变量的值。注意观察结果中的时间戳、执行成本(<code>cost</code>)以及变量的实际值，这些信息有助于理解程序运行时的状态。</p></li></ol><p><strong>解释</strong>：上述步骤依据Arthas提供的功能，允许你动态地跟踪和诊断Java应用，无需修改代码或重启服务。通过观察方法内的具体变量，你可以快速定位问题，比如理解某个变量如何随方法调用而变化，或是为何会出现异常等。</p><p>请根据你的实际需求调整上述命令和参数，以达到最佳的观察效果。如果在执行过程中遇到任何问题，或者需要进一步的调试帮助，请随时提出。</p><!----><h2 id="参考链接" tabindex="-1"><a class="header-anchor" href="#参考链接" aria-hidden="true">#</a> 参考链接 ：</h2><p>*<a href="https://github.com/alibaba/arthas/tree/master/site/docs/doc/watch.md" target="_blank" rel="noopener noreferrer"># watch<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><!----><h2 id="答疑服务说明" tabindex="-1"><a class="header-anchor" href="#答疑服务说明" aria-hidden="true">#</a> <!----></h2><p>本内容经由技术专家审阅的用户问答的镜像生成，我们提供了<!---->，在<!---->。您也可以访问 : <a href="https://answer.opensource.alibaba.com/docs/intro" target="_blank" rel="noopener noreferrer">全局专家答疑<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> 。 咨询其他产品的的问题</p><h3 id="反馈" tabindex="-1"><a class="header-anchor" href="#反馈" aria-hidden="true">#</a> 反馈</h3><p>如问答有错漏，欢迎点：<a href="https://ai.nacos.io/user/feedbackByEnhancerGradePOJOID?enhancerGradePOJOId=16090" target="_blank" rel="noopener noreferrer">差评<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>给我们反馈。</p></div><!--[--><!--]--></div><footer class="page-meta right-menu-padding" data-v-fdd717e0><div class="meta-item edit-link"><a class="external-link meta-item-label" href="https://github.com/alibaba/arthas/edit/master/site/docs/doc/expert/user-question-history15730.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: answeropensource@alibabacloud.com">answeropensource</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: hengyunabc@users.noreply.github.com">hengyunabc</span><!----><!--]--><!--]--></span></div></footer><nav class="page-nav right-menu-padding" data-v-fdd717e0><p class="inner"><span class="prev"><a href="/doc/expert/user-question-history14832.html" class="" aria-label="arthas启动时内存溢出"><!--[--><!--]--> arthas启动时内存溢出 <!--[--><!--]--></a></span><span class="next"><a href="/doc/expert/user-question-history11440.html" class="" aria-label="artahs 怎么使用？"><!--[--><!--]--> artahs 怎么使用？ <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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