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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>FAQ | arthas</title><meta name="description" content="arthas 使用文档">
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<link rel="modulepreload" href="/assets/app.98a29f3d.js"><link rel="modulepreload" href="/assets/faq.html.e3d03880.js"><link rel="modulepreload" href="/assets/faq.html.b63f83f8.js"><link rel="prefetch" href="/assets/index.html.9412a900.js"><link rel="prefetch" href="/assets/index.html.3c03373d.js"><link rel="prefetch" href="/assets/index.html.31581b5f.js"><link rel="prefetch" href="/assets/advanced-use.html.8541704b.js"><link rel="prefetch" href="/assets/advice-class.html.b9575000.js"><link rel="prefetch" href="/assets/agent.html.ea7c22e0.js"><link rel="prefetch" href="/assets/arthas-properties.html.4eb539b4.js"><link rel="prefetch" href="/assets/arthas3.html.bee7bffc.js"><link rel="prefetch" href="/assets/async.html.1383f1e0.js"><link rel="prefetch" href="/assets/auth.html.ac4b67f2.js"><link rel="prefetch" href="/assets/base64.html.4b181e89.js"><link rel="prefetch" href="/assets/batch-support.html.be1494de.js"><link rel="prefetch" href="/assets/cat.html.c8fbb1c5.js"><link rel="prefetch" href="/assets/classloader.html.04ede152.js"><link rel="prefetch" href="/assets/cls.html.315127c2.js"><link rel="prefetch" href="/assets/commands.html.205fab1f.js"><link rel="prefetch" href="/assets/contact-us.html.5499e765.js"><link rel="prefetch" href="/assets/dashboard.html.72692286.js"><link rel="prefetch" href="/assets/docker.html.37a9000f.js"><link rel="prefetch" href="/assets/download.html.e9e19894.js"><link rel="prefetch" href="/assets/dump.html.b8040881.js"><link rel="prefetch" href="/assets/echo.html.7dac4c37.js"><link rel="prefetch" href="/assets/getstatic.html.1f02ff5e.js"><link rel="prefetch" href="/assets/grep.html.09b9f3d8.js"><link rel="prefetch" href="/assets/groovy.html.5effbaba.js"><link rel="prefetch" href="/assets/heapdump.html.a85cf9a1.js"><link rel="prefetch" href="/assets/help.html.e5f40d88.js"><link rel="prefetch" href="/assets/history.html.9c7d2f2e.js"><link rel="prefetch" href="/assets/http-api.html.058fd714.js"><link rel="prefetch" href="/assets/idea-plugin.html.0e7ca126.js"><link rel="prefetch" href="/assets/install-detail.html.2265e71c.js"><link rel="prefetch" href="/assets/jad.html.0c530c3a.js"><link rel="prefetch" href="/assets/jfr.html.0b1c355a.js"><link rel="prefetch" href="/assets/jvm.html.bf9d7353.js"><link rel="prefetch" href="/assets/keymap.html.4a935f93.js"><link rel="prefetch" href="/assets/logger.html.1626eaca.js"><link rel="prefetch" href="/assets/manual-install.html.7d61ca70.js"><link rel="prefetch" href="/assets/mbean.html.30acbef7.js"><link rel="prefetch" href="/assets/mc.html.2ccc704e.js"><link rel="prefetch" href="/assets/memory.html.c50f6dfc.js"><link rel="prefetch" href="/assets/monitor.html.c7c0dac3.js"><link rel="prefetch" href="/assets/ognl.html.0b9692fa.js"><link rel="prefetch" href="/assets/options.html.f2203677.js"><link rel="prefetch" href="/assets/perfcounter.html.4783a666.js"><link rel="prefetch" href="/assets/profiler.html.3a0bc349.js"><link rel="prefetch" href="/assets/pwd.html.bb923193.js"><link rel="prefetch" href="/assets/quick-start.html.450734e7.js"><link rel="prefetch" href="/assets/quit.html.bc71e5cc.js"><link rel="prefetch" href="/assets/redefine.html.c762575e.js"><link rel="prefetch" href="/assets/release-notes.html.fef92c13.js"><link rel="prefetch" href="/assets/reset.html.05dc82b5.js"><link rel="prefetch" href="/assets/retransform.html.21fa57be.js"><link rel="prefetch" href="/assets/save-log.html.ad2052ca.js"><link rel="prefetch" href="/assets/sc.html.9e910d92.js"><link rel="prefetch" href="/assets/session.html.620f0ab0.js"><link rel="prefetch" href="/assets/sm.html.00c3d56b.js"><link rel="prefetch" href="/assets/spring-boot-starter.html.07a5bd45.js"><link rel="prefetch" href="/assets/stack.html.57a02d66.js"><link rel="prefetch" href="/assets/start-arthas.html.f299d09e.js"><link rel="prefetch" href="/assets/stop.html.75db3522.js"><link rel="prefetch" href="/assets/sysenv.html.fcd3f33c.js"><link rel="prefetch" href="/assets/sysprop.html.f64847c1.js"><link rel="prefetch" href="/assets/tee.html.6c47fb2b.js"><link rel="prefetch" href="/assets/thread.html.222deb53.js">
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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-a8869d06><!----><span class="site-name can-hide" data-v-a8869d06>arthas</span><span class="navbar-version" data-v-a8869d06>v3.7.2</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"><a href="/doc/commands.md" class="" aria-label="命令列表"><!--[--><!--]--> 命令列表 <!--[--><!--]--></a></div><div class="navbar-item"><a href="/doc/download.md" class="" aria-label="下载"><!--[--><!--]--> 下载 <!--[--><!--]--></a></div><div class="navbar-item"><div class="navbar-dropdown-wrapper"><button class="navbar-dropdown-title" type="button" aria-label="Select language"><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="1em" height="1em" style="height:1.25rem;width:1.25rem;vertical-align:bottom;" viewbox="0 0 24 24"><path fill="currentColor" d="M13.35 22q-.6 0-.862-.387q-.263-.388-.063-.963l3.65-9.675q.15-.4.563-.688Q17.05 10 17.5 10q.425 0 .85.287q.425.288.575.688l3.65 9.675q.2.575-.062.963q-.263.387-.888.387q-.275 0-.5-.175q-.225-.175-.325-.425l-.85-2.45H15.1l-.875 2.45q-.1.25-.35.425q-.25.175-.525.175Zm2.35-4.8h3.6l-1.75-4.95h-.1ZM7.15 8.55q.4.725.85 1.337q.45.613 1.05 1.263q1.1-1.2 1.825-2.462Q11.6 7.425 12.1 6H2q-.425 0-.712-.287Q1 5.425 1 5t.288-.713Q1.575 4 2 4h6V3q0-.425.288-.713Q8.575 2 9 2t.713.287Q10 2.575 10 3v1h6q.425 0 .712.287Q17 4.575 17 5t-.288.713Q16.425 6 16 6h-1.9q-.525 1.775-1.425 3.45q-.9 1.675-2.225 3.15l2.4 2.45l-.75 2.05L9 14l-4.3 4.3q-.275.275-.7.275q-.425 0-.7-.275q-.275-.275-.275-.7q0-.425.275-.7l4.35-4.35q-.675-.775-1.25-1.563q-.575-.787-1.025-1.662Q5.1 8.8 5.35 8.4t.875-.4q.25 0 .525.162q.275.163.4.388Z"></path></svg><span class="arrow down"></span></button><button class="navbar-dropdown-title-mobile" type="button" aria-label="Select language"><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="1em" height="1em" style="height:1.25rem;width:1.25rem;vertical-align:bottom;" viewbox="0 0 24 24"><path fill="currentColor" d="M13.35 22q-.6 0-.862-.387q-.263-.388-.063-.963l3.65-9.675q.15-.4.563-.688Q17.05 10 17.5 10q.425 0 .85.287q.425.288.575.688l3.65 9.675q.2.575-.062.963q-.263.387-.888.387q-.275 0-.5-.175q-.225-.175-.325-.425l-.85-2.45H15.1l-.875 2.45q-.1.25-.35.425q-.25.175-.525.175Zm2.35-4.8h3.6l-1.75-4.95h-.1ZM7.15 8.55q.4.725.85 1.337q.45.613 1.05 1.263q1.1-1.2 1.825-2.462Q11.6 7.425 12.1 6H2q-.425 0-.712-.287Q1 5.425 1 5t.288-.713Q1.575 4 2 4h6V3q0-.425.288-.713Q8.575 2 9 2t.713.287Q10 2.575 10 3v1h6q.425 0 .712.287Q17 4.575 17 5t-.288.713Q16.425 6 16 6h-1.9q-.525 1.775-1.425 3.45q-.9 1.675-2.225 3.15l2.4 2.45l-.75 2.05L9 14l-4.3 4.3q-.275.275-.7.275q-.425 0-.7-.275q-.275-.275-.275-.7q0-.42
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>更多参考 <a href="/doc/options.html" class="">options</a></p><div class="custom-container tip"><p class="custom-container-title">提示</p><p>通过 java.lang.instrument.Instrumentation#appendToBootstrapClassLoaderSearch append 到<code>Bootstrap ClassLoader</code>的 jar 包需要开启 unsafe。</p></div><h3 id="怎么以json格式查看结果" tabindex="-1"><a class="header-anchor" href="#怎么以json格式查看结果" aria-hidden="true">#</a> 怎么以<code>json</code>格式查看结果</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>options json-format <span class="token boolean">true</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>更多参考 <a href="/doc/options.html" class="">options</a></p><h3 id="arthas-能否跟踪-native-函数" tabindex="-1"><a class="header-anchor" href="#arthas-能否跟踪-native-函数" aria-hidden="true">#</a> Arthas 能否跟踪 native 函数</h3><p>不能。</p><h3 id="能不能查看内存里某个变量的值" tabindex="-1"><a class="header-anchor" href="#能不能查看内存里某个变量的值" aria-hidden="true">#</a> 能不能查看内存里某个变量的值</h3><ol><li>可以使用<a href="/doc/vmtool.html" class=""><code>vmtool</code></a>命令。</li><li>可以用一些技巧，用<a href="/doc/tt.html" class=""><code>tt</code></a>命令拦截到对象，或者从静态函数里取到对象。</li></ol><h3 id="方法同名过滤" tabindex="-1"><a class="header-anchor" href="#方法同名过滤" aria-hidden="true">#</a> 方法同名过滤</h3><p>同名方法过滤可以通过匹配表达式,可以使用<a href="/doc/advice-class.html" class="">表达式核心变量</a>中所有变量作为已知条件,可以通过判断参数个数<code>params.length ==1</code>, 参数类型<code>params[0] instanceof java.lang.Integer</code>、返回值类型 <code>returnObj instanceof java.util.List</code> 等等一种或者多种组合进行过滤。</p><p>可以使用 <code>-v</code> 查看观察匹配表达式的执行结果 <a href="https://github.com/alibaba/arthas/issues/1348" target="_blank" rel="noopener noreferrer">https://github.com/alibaba/arthas/issues/1348<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><p>例子<a href="/doc/quick-start.html" class="">math-game</a></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">'{params,returnObj,throwExp}'</span> <span class="token string">'params.length >0 && returnObj instanceof java.util.List'</span> <span class="token parameter variable">-v</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="怎么-watch、trace-构造函数" tabindex="-1"><a class="header-anchor" href="#怎么-watch、trace-构造函数" aria-hidden="true">#</a> 怎么 watch、trace 构造函数 ？</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token function">watch</span> demo.MathGame <span class="token operator"><</span>init<span class="token operator">></span> <span class="token string">'{params,returnObj,throwExp}'</span> <span class="token parameter variable">-v</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="怎样-watch、trace-内部类" tabindex="-1"><a class="header-anchor" href="#怎样-watch、trace-内部类" aria-hidden="true">#</a> 怎样 watch、trace 内部类？</h3><p>在 JVM 规范里内部类的格式是<code>OuterClass$InnerClass</code>。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token function">watch</span> OuterClass<span class="token variable">$InnerClass</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="输入中文-unicode-字符" tabindex="-1"><a class="header-anchor" href="#输入中文-unicode-字符" aria-hidden="true">#</a> 输入中文/Unicode 字符</h3><p>把中文/Unicode 字符转为<code>\u</code>表示方法：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>ognl <span class="token string">'@java.lang.System@out.println("Hello \u4e2d\u6587")'</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="java-lang-classformaterror-null、skywalking-arthas-兼容使用" tabindex="-1"><a class="header-anchor" href="#java-lang-classformaterror-null、skywalking-arthas-兼容使用" aria-hidden="true">#</a> java.lang.ClassFormatError: null、skywalking arthas 兼容使用</h3><p>当出现这个错误日志<code>java.lang.ClassFormatError: null</code>,通常情况下都是被其他字节码工具修改过与 arthas 修改字节码不兼容。</p><p>比如: 使用 skywalking V8.1.0 以下版本 <a href="https://github.com/alibaba/arthas/issues/1141" target="_blank" rel="noopener noreferrer">无法 trace、watch 被 skywalking agent 增强过的类<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>, V8.1.0 以上版本可以兼容使用,更多参考 skywalking 配置 <a href="https://github.com/apache/skywalking/blob/master/docs/en/FAQ/Compatible-with-other-javaagent-bytecode-processing.md#" target="_blank" rel="noopener noreferrer">skywalking compatible with other javaagent bytecode processing<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><h4 id="class-redefinition-failed-attempted-to-change-the-schema-add-remove-fields" tabindex="-1"><a class="header-anchor" href="#class-redefinition-failed-attempted-to-change-the-schema-add-remove-fields" aria-hidden="true">#</a> class redefinition failed: attempted to change the schema (add/remove fields)</h4><p>参考： <a href="https://github.com/alibaba/arthas/issues/2165" target="_blank" rel="noopener noreferrer">https://github.com/alibaba/arthas/issues/2165<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><h3 id="arthas-能不能离线使用" tabindex="-1"><a class="header-anchor" href="#arthas-能不能离线使用" aria-hidden="true">#</a> Arthas 能不能离线使用</h3><p>可以。下载全量包解压即可，参考: <a href="/doc/download.html" class="">下载</a>。</p><h3 id="attach-docker-k8s-里的-pid-为-1-的进程失败" tabindex="-1"><a class="header-anchor" href="#attach-docker-k8s-里的-pid-为-1-的进程失败" aria-hidden="true">#</a> Attach docker/k8s 里的 pid 为 1 的进程失败</h3><p>参考： <a href="https://github.com/alibaba/arthas/issues/362#issuecomment-448185416" target="_blank" rel="noopener noreferrer">https://github.com/alibaba/arthas/issues/362#issuecomment-448185416<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="M1
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