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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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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-e0e60120><!--[--><!--]--><div class="right-menu-padding theme-default-content" data-v-e0e60120><!--[--><!--]--><div class="right-menu-wrapper" data-v-e0e60120><div class="right-menu-margin"><div class="right-menu-title">目录</div><div class="right-menu-content"><!--[--><!--]--></div></div></div><div data-v-e0e60120><h1 id="faq" tabindex="-1"><a class="header-anchor" href="#faq" aria-hidden="true">#</a> FAQ</h1><div class="custom-container tip"><p class="custom-container-title">提示</p><p>不在本列表里的问题，请到 issue 里搜索。 <a href="https://github.com/alibaba/arthas/issues" target="_blank" rel="noopener noreferrer">https://github.com/alibaba/arthas/issues<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></div><h3 id="日志文件在哪里" tabindex="-1"><a class="header-anchor" href="#日志文件在哪里" aria-hidden="true">#</a> 日志文件在哪里？</h3><p>日志文件路径： <code>~/logs/arthas/arthas.log</code></p><h3 id="arthas-attach-之后对原进程性能有多大的影响" tabindex="-1"><a class="header-anchor" href="#arthas-attach-之后对原进程性能有多大的影响" aria-hidden="true">#</a> Arthas attach 之后对原进程性能有多大的影响</h3><p><a href="https://github.com/alibaba/arthas/issues/44" target="_blank" rel="noopener noreferrer">https://github.com/alibaba/arthas/issues/44<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="target-process-not-responding-or-hotspot-vm-not-loaded" tabindex="-1"><a class="header-anchor" href="#target-process-not-responding-or-hotspot-vm-not-loaded" aria-hidden="true">#</a> target process not responding or HotSpot VM not loaded</h3><p>com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded</p><ol><li>检查当前用户和目标 java 进程是否一致。如果不一致，则切换到同一用户。JVM 只能 attach 同样用户下的 java 进程。</li><li>尝试使用 <code>jstack -l $pid</code>，如果进程没有反应，则说明进程可能假死，无法响应 JVM attach 信号。所以同样基于 attach 机制的 Arthas 无法工作。尝试使用<code>jmap</code> heapdump 后分析。</li><li>尝试按<a href="/doc/quick-start.html" class="">quick-start</a>里的方式 attach math-game。</li><li>更多情况参考： <a href="https://github.com/alibaba/arthas/issues/347" target="_blank" rel="noopener noreferrer">https://github.com/alibaba/arthas/issues/347<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></ol><h3 id="trace-watch-等命令能否增强-jdk-里的类" tabindex="-1"><a class="header-anchor" href="#trace-watch-等命令能否增强-jdk-里的类" aria-hidden="true">#</a> trace/watch 等命令能否增强 jdk 里的类？</h3><p>默认情况下会过滤掉<code>java.</code>开头的类和被<code>BootStrap ClassLoader</code>加载的类。可以通过参数开启。</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>options unsafe <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><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> -v
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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> -v
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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="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="为什么下载了新版本的-arthas-连接的却是旧版本" tabindex="-1"><a class="header-anchor" href="#为什么下载了新版本的-arthas-连接的却是旧版本" aria-hidden="true">#</a> 为什么下载了新版本的 Arthas，连接的却是旧版本？</h3><p>比如启动的 <code>as.sh/arthas-boot.jar</code> 版本是 3.5._ 的，但是连接上之后，打印的 arthas 版本是 3.4._ 的。</p><p>可能是之前使用旧版本的 arthas 诊断过目标进程。可以先执行<code>stop</code>停止掉旧版本的 arthas，再重新使用新版本 attach。</p></div><!--[--><!--]--></div><footer class="page-meta right-menu-padding" 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/faq.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 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Dewei</span><!----><!--]--><!--]--></span></div></footer><nav class="page-nav right-menu-padding" data-v-e0e60120><p class="inner"><span class="prev"><a href="/doc/idea-plugin.html" class="" aria-label="IDEA Plugin"><!--[--><!--]--> IDEA Plugin <!--[--><!--]--></a></span><span class="next"><a class="external-link" href="https://github.com/alibaba/arthas/issues?q=label%3Auser-case" rel="noopener noreferrer" target="_blank" aria-label="用户案列"><!--[--><!--]--><span>用户案列</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 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