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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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<link rel="modulepreload" href="/assets/app.e2a14028.js"><link rel="modulepreload" href="/assets/logger.html.f244d8fe.js"><link rel="modulepreload" href="/assets/logger.html.00fe1bd5.js"><link rel="prefetch" href="/assets/index.html.fb508fb7.js"><link rel="prefetch" href="/assets/index.html.496d2537.js"><link rel="prefetch" href="/assets/index.html.b8fa569a.js"><link rel="prefetch" href="/assets/advanced-use.html.9badac76.js"><link rel="prefetch" href="/assets/advice-class.html.c44e2db1.js"><link rel="prefetch" href="/assets/agent.html.a2fa633a.js"><link rel="prefetch" href="/assets/arthas-properties.html.2bd43f4a.js"><link rel="prefetch" href="/assets/arthas3.html.0c62d022.js"><link rel="prefetch" href="/assets/async.html.2ba5ce81.js"><link rel="prefetch" href="/assets/auth.html.cb7eedc8.js"><link rel="prefetch" href="/assets/base64.html.5dcb08a0.js"><link rel="prefetch" href="/assets/batch-support.html.fbf93544.js"><link rel="prefetch" href="/assets/cat.html.ced78e32.js"><link rel="prefetch" href="/assets/classloader.html.e74a1cf5.js"><link rel="prefetch" href="/assets/cls.html.6a37f7de.js"><link rel="prefetch" href="/assets/commands.html.9d3bd2f6.js"><link rel="prefetch" href="/assets/contact-us.html.13d6c32c.js"><link rel="prefetch" href="/assets/dashboard.html.c22cb3f3.js"><link rel="prefetch" href="/assets/docker.html.3a6ad7da.js"><link rel="prefetch" href="/assets/download.html.cf6fa224.js"><link rel="prefetch" href="/assets/dump.html.dae123e7.js"><link rel="prefetch" href="/assets/echo.html.7c20f80e.js"><link rel="prefetch" href="/assets/faq.html.8ddfb8fa.js"><link rel="prefetch" href="/assets/getstatic.html.81caebc4.js"><link rel="prefetch" href="/assets/grep.html.625b2ba8.js"><link rel="prefetch" href="/assets/groovy.html.1e90fb12.js"><link rel="prefetch" href="/assets/heapdump.html.2b4fd6d5.js"><link rel="prefetch" href="/assets/help.html.5dfbf9d1.js"><link rel="prefetch" href="/assets/history.html.ed2eb78b.js"><link rel="prefetch" href="/assets/http-api.html.7cda0410.js"><link rel="prefetch" href="/assets/idea-plugin.html.55289de2.js"><link rel="prefetch" href="/assets/install-detail.html.733f8b72.js"><link rel="prefetch" href="/assets/jad.html.8ec3b078.js"><link rel="prefetch" href="/assets/jfr.html.f9f2dcd5.js"><link rel="prefetch" href="/assets/jvm.html.16ff63b8.js"><link rel="prefetch" href="/assets/keymap.html.3317cd01.js"><link rel="prefetch" href="/assets/manual-install.html.175af1d9.js"><link rel="prefetch" href="/assets/mbean.html.69ffbc4b.js"><link rel="prefetch" href="/assets/mc.html.910a55d4.js"><link rel="prefetch" href="/assets/memory.html.8c99cf72.js"><link rel="prefetch" href="/assets/monitor.html.50d615e9.js"><link rel="prefetch" href="/assets/ognl.html.e0326122.js"><link rel="prefetch" href="/assets/options.html.4d2fd6bb.js"><link rel="prefetch" href="/assets/perfcounter.html.a18a75a5.js"><link rel="prefetch" href="/assets/profiler.html.249f4976.js"><link rel="prefetch" href="/assets/pwd.html.5eaa6d9f.js"><link rel="prefetch" href="/assets/quick-start.html.ec93254e.js"><link rel="prefetch" href="/assets/quit.html.b82d1f6c.js"><link rel="prefetch" href="/assets/redefine.html.022d56f8.js"><link rel="prefetch" href="/assets/release-notes.html.45aa39b3.js"><link rel="prefetch" href="/assets/reset.html.6cd1cd7f.js"><link rel="prefetch" href="/assets/retransform.html.25f5ce4b.js"><link rel="prefetch" href="/assets/save-log.html.c3bc5a5e.js"><link rel="prefetch" href="/assets/sc.html.9b6b2f17.js"><link rel="prefetch" href="/assets/session.html.7d83c2a2.js"><link rel="prefetch" href="/assets/sm.html.62bb65b6.js"><link rel="prefetch" href="/assets/spring-boot-starter.html.6933c1e5.js"><link rel="prefetch" href="/assets/stack.html.15b08ed7.js"><link rel="prefetch" href="/assets/start-arthas.html.1a90c4af.js"><link rel="prefetch" href="/assets/stop.html.1ba96921.js"><link rel="prefetch" href="/assets/sysenv.html.7a1b9682.js"><link rel="prefetch" href="/assets/sysprop.html.6b2f64e3.js"><link rel="prefetch" href="/assets/tee.html.6ed1d7c0.js"><link rel="prefetch" href="/assets/thread.html.3c801838.j
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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-61144abc><!----><span class="site-name can-hide" data-v-61144abc>arthas</span><span class="navbar-version" data-v-61144abc>v3.6.7</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="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=artha
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>configuration</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>appender</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>APPLICATION<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>ch.qos.logback.core.rolling.RollingFileAppender<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>file</span><span class="token punctuation">></span></span>app.log<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>file</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>rollingPolicy</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>fileNamePattern</span><span class="token punctuation">></span></span>mylog-%d{yyyy-MM-dd}.%i.txt<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>fileNamePattern</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>maxFileSize</span><span class="token punctuation">></span></span>100MB<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>maxFileSize</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>maxHistory</span><span class="token punctuation">></span></span>60<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>maxHistory</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>totalSizeCap</span><span class="token punctuation">></span></span>2GB<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>totalSizeCap</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>rollingPolicy</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>encoder</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>pattern</span><span class="token punctuation">></span></span>%logger{35} - %msg%n<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>pattern</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>encoder</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>appender</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>appender</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>ASYNC<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>ch.qos.logback.classic.AsyncAppender<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>appender-ref</span> <span class="token attr-name">ref</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>APPLICATION<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>appender</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>appender</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>CONSOLE<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>ch.qos.logback.core.ConsoleAppender<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>encoder</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>pattern</span><span class="token punctuation">></span></span>%-4relative [%thread] %-5level %logger{35} - %msg %n
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>pattern</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>charset</span><span class="token punctuation">></span></span>utf8<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>charset</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>encoder</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>appender</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>root</span> <span class="token attr-name">level</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>INFO<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>appender-ref</span> <span class="token attr-name">ref</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>CONSOLE<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>appender-ref</span> <span class="token attr-name">ref</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>ASYNC<span class="token punctuation">"</span></span> <span class="token punctuation">/></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>root</span><span class="token punctuation">></span></span>
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<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>configuration</span><span class="token punctuation">></span></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 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><p>使用<code>logger</code>命令打印的结果是：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token punctuation">[</span>arthas@2062<span class="token punctuation">]</span>$ logger
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name ROOT
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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level INFO
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effectiveLevel INFO
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additivity <span class="token boolean">true</span>
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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appenders name CONSOLE
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class ch.qos.logback.core.ConsoleAppender
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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target System.out
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name APPLICATION
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class ch.qos.logback.core.rolling.RollingFileAppender
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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<span class="token function">file</span> app.log
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name ASYNC
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class ch.qos.logback.classic.AsyncAppender
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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appenderRef <span class="token punctuation">[</span>APPLICATION<span class="token punctuation">]</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 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>从<code>appenders</code>的信息里，可以看到</p><ul><li><code>CONSOLE</code> logger 的 target 是<code>System.out</code></li><li><code>APPLICATION</code> logger 是<code>RollingFileAppender</code>，它的 file 是<code>app.log</code></li><li><code>ASYNC</code>它的<code>appenderRef</code>是<code>APPLICATION</code>，即异步输出到文件里</li></ul><h3 id="查看指定名字的-logger-信息" tabindex="-1"><a class="header-anchor" href="#查看指定名字的-logger-信息" aria-hidden="true">#</a> 查看指定名字的 logger 信息</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token punctuation">[</span>arthas@2062<span class="token punctuation">]</span>$ logger <span class="token parameter variable">-n</span> org.springframework.web
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name org.springframework.web
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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level null
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effectiveLevel INFO
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additivity <span class="token boolean">true</span>
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="查看指定-classloader-的-logger-信息" tabindex="-1"><a class="header-anchor" href="#查看指定-classloader-的-logger-信息" aria-hidden="true">#</a> 查看指定 classloader 的 logger 信息</h3><p>注意 hashcode 是变化的，需要先查看当前的 ClassLoader 信息，提取对应 ClassLoader 的 hashcode。</p><p>如果你使用<code>-c</code>，你需要手动输入 hashcode：<code>-c <hashcode></code></p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token punctuation">[</span>arthas@2062<span class="token punctuation">]</span>$ logger <span class="token parameter variable">-c</span> 2a139a55
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name ROOT
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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level DEBUG
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effectiveLevel DEBUG
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additivity <span class="token boolean">true</span>
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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appenders name CONSOLE
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class ch.qos.logback.core.ConsoleAppender
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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target System.out
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name APPLICATION
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class ch.qos.logback.core.rolling.RollingFileAppender
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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<span class="token function">file</span> app.log
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name ASYNC
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class ch.qos.logback.classic.AsyncAppender
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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appenderRef <span class="token punctuation">[</span>APPLICATION<span class="token punctuation">]</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 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>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>logger --classLoaderClass sun.misc.Launcher$AppClassLoader</code></p><ul><li>注: 这里 classLoaderClass 在 java 8 是 sun.misc.Launcher$AppClassLoader，而java 11的classloader是jdk.internal.loader.ClassLoaders$AppClassLoader。</li></ul><p><code>--classLoaderClass</code> 的值是 ClassLoader 的类名，只有匹配到唯一的 ClassLoader 实例时才能工作，目的是方便输入通用命令，而<code>-c <hashcode></code>是动态变化的。</p><h3 id="更新-logger-level" tabindex="-1"><a class="header-anchor" href="#更新-logger-level" aria-hidden="true">#</a> 更新 logger level</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token punctuation">[</span>arthas@2062<span class="token punctuation">]</span>$ logger <span class="token parameter variable">--name</span> ROOT <span class="token parameter variable">--level</span> debug
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update logger level success.
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="指定-classloader-更新-logger-level" tabindex="-1"><a class="header-anchor" href="#指定-classloader-更新-logger-level" aria-hidden="true">#</a> 指定 classloader 更新 logger level</h3><p>默认情况下，logger 命令会在 SystemClassloader 下执行，如果应用是传统的<code>war</code>应用，或者 spring boot fat jar 启动的应用，那么需要指定 classloader。</p><p>可以先用 <code>sc -d yourClassName</code> 来查看具体的 classloader hashcode，然后在更新 level 时指定 classloader：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token punctuation">[</span>arthas@2062<span class="token punctuation">]</span>$ logger <span class="token parameter variable">-c</span> 2a139a55 <span class="token parameter variable">--name</span> ROOT <span class="token parameter variable">--level</span> debug
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="查看没有-appender-的-logger-的信息" tabindex="-1"><a class="header-anchor" href="#查看没有-appender-的-logger-的信息" aria-hidden="true">#</a> 查看没有 appender 的 logger 的信息</h3><p>默认情况下，<code>logger</code>命令只打印有 appender 的 logger 的信息。如果想查看没有<code>appender</code>的 logger 的信息，可以加上参数<code>--include-no-appender</code>。</p><p>注意，通常输出结果会很长。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code><span class="token punctuation">[</span>arthas@2062<span class="token punctuation">]</span>$ logger --include-no-appender
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name ROOT
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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level DEBUG
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effectiveLevel DEBUG
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additivity <span class="token boolean">true</span>
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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appenders name CONSOLE
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class ch.qos.logback.core.ConsoleAppender
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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target System.out
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name APPLICATION
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class ch.qos.logback.core.rolling.RollingFileAppender
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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<span class="token function">file</span> app.log
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name ASYNC
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class ch.qos.logback.classic.AsyncAppender
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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appenderRef <span class="token punctuation">[</span>APPLICATION<span class="token punctuation">]</span>
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name com
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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level null
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effectiveLevel DEBUG
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additivity <span class="token boolean">true</span>
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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name com.alibaba
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class ch.qos.logback.classic.Logger
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classLoader sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@2a139a55
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classLoaderHash 2a139a55
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level null
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effectiveLevel DEBUG
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additivity <span class="token boolean">true</span>
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codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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<span class="token punctuation">..</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 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 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 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/logger.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: i@fatpandac.com">Fatpandac</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><nav class="page-nav right-menu-padding" data-v-fdd717e0><p class="inner"><span class="prev"><a href="/doc/jvm.html" class="" aria-label="jvm"><!--[--><!--]--> jvm <!--[--><!--]--></a></span><span class="next"><a href="/doc/mbean.html" class="" aria-label="mbean"><!--[--><!--]--> mbean <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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<script type="module" src="/assets/app.e2a14028.js" defer></script>
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</body>
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</html>
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