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trace:com.sun.tools.attach"><!--[--><!--]--> Start arthas failed, exception stack trace:com.sun.tools.attach <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15731.html" class="sidebar-item" aria-label="arthas 过滤方法的阐述"><!--[--><!--]--> arthas 过滤方法的阐述 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11442.html" class="sidebar-item" aria-label="arthas 介绍一下"><!--[--><!--]--> arthas 介绍一下 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11468.html" class="sidebar-item" aria-label="arthas 怎么使用？"><!--[--><!--]--> arthas 怎么使用？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12706.html" class="sidebar-item" aria-label="arthas 火焰图 怎么看？"><!--[--><!--]--> arthas 火焰图 怎么看？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13509.html" class="sidebar-item" aria-label="通过arthas怎样排查项目中，哪个对象泄露了，或者占用内存太大"><!--[--><!--]--> 通过arthas怎样排查项目中，哪个对象泄露了，或者占用内存太大 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14834.html" class="sidebar-item" aria-label="使用arthas 跟踪进程服务后，进程所占用的文件描述符陡增，且文件描述符不下降"><!--[--><!--]--> 使用arthas 跟踪进程服务后，进程所占用的文件描述符陡增，且文件描述符不下降 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15735.html" class="sidebar-item" aria-label="arthas报错connect to telnet server error: 127.0.0.1 9999"><!--[--><!--]--> arthas报错connect to telnet server error: 127.0.0.1 9999 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11443.html" class="sidebar-item" aria-label="arthas 下载和安装"><!--[--><!--]--> arthas 下载和安装 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11469.html" class="sidebar-item" aria-label="linux的arthas使用教程"><!--[--><!--]--> linux的arthas使用教程 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12715.html" class="sidebar-item" aria-label="java 如何用arthas 查看 内存 情况？"><!--[--><!--]--> java 如何用arthas 查看 内存 情况？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13510.html" class="sidebar-item" aria-label="查看实时jvm内存大小"><!--[--><!--]--> 查看实时jvm内存大小 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14840.html" class="sidebar-item" aria-label="Unsupported class file major version 61 using arthas 3.6.3"><!--[--><!--]--> Unsupported class file major version 61 using arthas 3.6.3 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15736.html" class="sidebar-item" aria-label="arthas 中jad参数"><!--[--><!--]--> arthas 中jad参数 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11444.html" class="sidebar-item" aria-label="arthas 命令解释"><!--[--><!--]--> arthas 命令解释 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11784.html" class="sidebar-item" aria-label="arthas使用的各类方式有哪些？"><!--[--><!--]--> arthas使用的各类方式有哪些？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12716.html" class="sidebar-item" aria-label="arthas 怎么查看堆内存太高"><!--[--><!--]--> arthas 怎么查看堆内存太高 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13511.html" class="sidebar-item" 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 分析内存升高的方法"><!--[--><!--]--> arthas 分析内存升高的方法 <!--[--><!--]--></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="arthas 怎么查看内存情况？"><!--[--><!--]--> arthas 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 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" rel="noopener noreferrer" target="_blank" aria-label="Star me at github"><!--[--><!--]--><span>Star me at github</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/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><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="telnet-connect-to-address-127-0-0-1-connection-refused" tabindex="-1"><a class="header-anchor" href="#telnet-connect-to-address-127-0-0-1-connection-refused" aria-hidden="true">#</a> telnet: connect to address 127.0.0.1: Connection refused</h3><ol><li>检查日志 <code>~/logs/arthas/arthas.log</code></li><li>检查<code>as.sh</code>/<code>arthas-boot.jar</code> 的启动参数，是否指定了特定的<code>port</code></li><li>用<code>netstat</code> 检查<code>LISTEN 3658</code> 端口的进程，确认它是<code>java</code>进程，并且是想要诊断的进程</li><li>如果<code>LISTEN 3658</code> 端口的进程不是 <code>java</code> 进程，则<code>3658</code>端口已经被占用。需要在<code>as.sh</code>/<code>arthas-boot.jar</code> 的启动参数指定其它端口。</li><li>确认进程和端口后，尝试用<code>telnet 127.0.0.1 3658</code>去连接</li></ol><p>本质上<code>arthas</code>会在应用java进程内启动一个<code>tcp server</code>，然后使用<code>telnet</code>去连接它。</p><ol><li>可能端口不匹配</li><li>可能进程本身已经挂起，不能接受新连接</li></ol><p>如果Arthas 日志里有 <code>Arthas server already bind.</code></p><ol><li>说明<code>Arthas server</code>曾经启动过，检查目标进程打开的文件描述符。如果是<code>linux</code>环境，可以去 <code>/proc/$pid/fd</code> 下面，使用<code>ls -alh | grep arthas</code>，检查进程是否已加载<code>arthas</code>相关的 jar 包。</li><li>如果没有，那么可能已启动<code>arthas</code>的是其它进程，也可能应用已经重启过了。</li></ol><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> <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="是否支持-watch、trace-lambda-类" tabindex="-1"><a class="header-anchor" href="#是否支持-watch、trace-lambda-类" aria-hidden="true">#</a> 是否支持 watch、trace lambda 类？</h3><p>对于lambda生成的类，会跳过处理，因为 JVM 本身限制对 lambda 生成的类做增强。</p><ul><li><a href="https://github.com/alibaba/arthas/issues/1225" target="_blank" rel="noopener noreferrer">https://github.com/alibaba/arthas/issues/1225<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></ul><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="arthas-怎么使用指定版本-不使用自动升级版本" tabindex="-1"><a class="header-anchor" href="#arthas-怎么使用指定版本-不使用自动升级版本" aria-hidden="true">#</a> Arthas 怎么使用指定版本，不使用自动升级版本</h3><ol><li>启动 <code>as.sh</code>/<code>arthas-boot.jar</code>时，可以用 <code>--use-version</code> 参数指定。</li><li>下载全量包，解压后，<code>cd</code>到arthas目录启动，这种情况会使用当前目录下的版本。</li></ol><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><h3 id="在ognl表达式中获取到-spring-bean-cglib-对象-但是-field-是-null" tabindex="-1"><a class="header-anchor" href="#在ognl表达式中获取到-spring-bean-cglib-对象-但是-field-是-null" aria-hidden="true">#</a> 在ognl表达式中获取到 spring bean cglib 对象，但是 field 是 null</h3><p>参考：</p><ul><li><a href="https://github.com/alibaba/arthas/issues/1802" target="_blank" rel="noopener noreferrer">https://github.com/alibaba/arthas/issues/1802<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="https://github.com/alibaba/arthas/issues/1424" target="_blank" rel="noopener noreferrer">https://github.com/alibaba/arthas/issues/1424<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></ul></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/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 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: hengyunabc@users.noreply.github.com">hengyunabc</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: 983433479@qq.com">汪吉</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: 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