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在线教程在哪？"><!--[--><!--]--> arthas 在线教程在哪？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12455.html" class="sidebar-item" aria-label="arthas 排查内存泄露的具体方法"><!--[--><!--]--> arthas 排查内存泄露的具体方法 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13508.html" class="sidebar-item" aria-label="arthas 如何查看内存使用情况"><!--[--><!--]--> arthas 如何查看内存使用情况 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14833.html" class="sidebar-item" aria-label="Start arthas failed, exception stack 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="artahs 过滤方法的阐述"><!--[--><!--]--> artahs 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 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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 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20么？"><!--[--><!--]--> arthas 支持jdk 20么？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15737.html" class="sidebar-item" aria-label="进程停了 arthas也会同步停止么？"><!--[--><!--]--> 进程停了 arthas也会同步停止么？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11450.html" class="sidebar-item" aria-label="arthas 分析thread线程卡住"><!--[--><!--]--> arthas 分析thread线程卡住 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11795.html" class="sidebar-item" aria-label="使用arthas查看成员变量值具体怎么做？"><!--[--><!--]--> 使用arthas查看成员变量值具体怎么做？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12740.html" class="sidebar-item" aria-label="arthas怎么分析cpu很高"><!--[--><!--]--> arthas怎么分析cpu很高 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13512.html" class="sidebar-item" aria-label="如何查看java内存增长哪些对象"><!--[--><!--]--> 如何查看java内存增长哪些对象 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15167.html" class="sidebar-item" aria-label="介绍一下arthas"><!--[--><!--]--> 介绍一下arthas <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15738.html" class="sidebar-item" aria-label="arthas如何查看hashmap的值"><!--[--><!--]--> arthas如何查看hashmap的值 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11451.html" class="sidebar-item" aria-label="arthas 怎么排查cpu占用过高？"><!--[--><!--]--> arthas 怎么排查cpu占用过高？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11809.html" class="sidebar-item" aria-label="linux下的arthas 具体怎么用？（使用教程）"><!--[--><!--]--> linux下的arthas 具体怎么用？（使用教程） <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12741.html" class="sidebar-item" aria-label="如何使用arthas查看系统哪个地方内存占用过大"><!--[--><!--]--> 如何使用arthas查看系统哪个地方内存占用过大 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13513.html" class="sidebar-item" aria-label="arthas 监听成员变量值的方法是什么？"><!--[--><!--]--> arthas 监听成员变量值的方法是什么？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15543.html" class="sidebar-item" aria-label="arthas中tt命令如何查看方法入参的具体命令"><!--[--><!--]--> arthas中tt命令如何查看方法入参的具体命令 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15739.html" class="sidebar-item" aria-label="arthas可以监听私有方法吗"><!--[--><!--]--> arthas可以监听私有方法吗 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11452.html" class="sidebar-item" aria-label="arthas 查看方法耗时"><!--[--><!--]--> arthas 查看方法耗时 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11810.html" class="sidebar-item" aria-label="arthas查看方法耗时"><!--[--><!--]--> arthas查看方法耗时 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13448.html" class="sidebar-item" aria-label="如何使用arthas分析慢查询"><!--[--><!--]--> 如何使用arthas分析慢查询 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13522.html" class="sidebar-item" aria-label="Connect to telnet server error: 127.0.0.1 3658"><!--[--><!--]--> Connect to telnet server error: 127.0.0.1 3658 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15726.html" class="sidebar-item" aria-label="arthas 如何查询static变量"><!--[--><!--]--> arthas 如何查询static变量 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15740.html" class="sidebar-item" aria-label="arthas 分析内存身高的方法"><!--[--><!--]--> arthas 分析内存身高的方法 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11453.html" class="sidebar-item" aria-label="arthas 怎样查看方法耗时"><!--[--><!--]--> arthas 怎样查看方法耗时 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11814.html" class="sidebar-item" aria-label="arthas 怎么排查内存泄漏"><!--[--><!--]--> arthas 怎么排查内存泄漏 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13504.html" class="sidebar-item" aria-label="如何查看实时jvm内存大小占用"><!--[--><!--]--> 如何查看实时jvm内存大小占用 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14763.html" class="sidebar-item" aria-label="利用Arthas排查NoSuchMethodError"><!--[--><!--]--> 利用Arthas排查NoSuchMethodError <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15728.html" class="sidebar-item" aria-label="arthas 获取成员变量"><!--[--><!--]--> arthas 获取成员变量 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history11454.html" class="sidebar-item" aria-label="arthas 常用命令介绍"><!--[--><!--]--> arthas 常用命令介绍 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history12453.html" class="sidebar-item" aria-label="artahs 怎么查看内存情况？"><!--[--><!--]--> artahs 怎么查看内存情况？ <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history13506.html" class="sidebar-item" aria-label="如何查看java内存增长哪些对象"><!--[--><!--]--> 如何查看java内存增长哪些对象 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history14831.html" class="sidebar-item" aria-label="Dashboard 命令cpuUsage长期在90%左右"><!--[--><!--]--> Dashboard 命令cpuUsage长期在90%左右 <!--[--><!--]--></a><!----></li><li><a href="/doc/expert/user-question-history15729.html" class="sidebar-item" aria-label="arthas 怎么查看变量内容"><!--[--><!--]--> arthas 怎么查看变量内容 <!--[--><!--]--></a><!----></li><!--]--></ul></li><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/issues?q=label%3Auser-case" rel="noopener noreferrer" target="_blank" aria-label="用户案例"><!--[--><!--]--><span>用户案例</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path 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="options" tabindex="-1"><a class="header-anchor" href="#options" aria-hidden="true">#</a> options</h1><p><a href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&id=command-options" target="_blank" rel="noopener noreferrer"><code>options</code>在线教程<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 class="custom-container tip"><p class="custom-container-title">提示</p><p>全局开关</p></div><table><thead><tr><th>名称</th><th>默认值</th><th>描述</th></tr></thead><tbody><tr><td>unsafe</td><td>false</td><td>是否支持对系统级别的类进行增强，打开该开关可能导致把 JVM 搞挂，请慎重选择！</td></tr><tr><td>dump</td><td>false</td><td>是否支持被增强了的类 dump 到外部文件中，如果打开开关，class 文件会被 dump 到<code>/${application working dir}/arthas-class-dump/</code>目录下，具体位置详见控制台输出</td></tr><tr><td>batch-re-transform</td><td>true</td><td>是否支持批量对匹配到的类执行 retransform 操作</td></tr><tr><td>json-format</td><td>false</td><td>是否支持 json 化的输出</td></tr><tr><td>disable-sub-class</td><td>false</td><td>是否禁用子类匹配，默认在匹配目标类的时候会默认匹配到其子类，如果想精确匹配，可以关闭此开关</td></tr><tr><td>support-default-method</td><td>true</td><td>是否支持匹配到 default method， 默认会查找 interface，匹配里面的 default method。参考 <a href="https://github.com/alibaba/arthas/issues/1105" target="_blank" rel="noopener noreferrer">#1105<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a></td></tr><tr><td>save-result</td><td>false</td><td>是否打开执行结果存日志功能，打开之后所有命令的运行结果都将保存到<code>~/logs/arthas-cache/result.log</code>中</td></tr><tr><td>job-timeout</td><td>1d</td><td>异步后台任务的默认超时时间，超过这个时间，任务自动停止；比如设置 1d, 2h, 3m, 25s，分别代表天、小时、分、秒</td></tr><tr><td>print-parent-fields</td><td>true</td><td>是否打印在 parent class 里的 filed</td></tr><tr><td>verbose</td><td>false</td><td>是否打印更多详细信息</td></tr><tr><td>strict</td><td>true</td><td>是否启用 strict 模式</td></tr></tbody></table><h2 id="查看所有的-options" tabindex="-1"><a class="header-anchor" href="#查看所有的-options" aria-hidden="true">#</a> 查看所有的 options</h2><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ options
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LEVEL TYPE NAME VALUE SUMMARY DESCRIPTION
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-------------------------------------------------------------------------------------------------------
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<span class="token number">0</span> boolea unsafe <span class="token boolean">false</span> Option to support sy This option enables to proxy functionality
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n stem-level class of JVM classes. Due to serious security r
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isk a JVM crash is possibly be introduced.
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Do not activate it unless you are able to
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manage.
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<span class="token number">1</span> boolea dump <span class="token boolean">false</span> Option to dump the e This option enables the enhanced classes t
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n nhanced classes o be dumped to external <span class="token function">file</span> <span class="token keyword">for</span> further d
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e-compilation and analysis.
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<span class="token number">1</span> boolea batch-re-tra <span class="token boolean">true</span> Option to support ba This options enables to reTransform classe
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n nsform tch reTransform Clas s with batch mode.
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s
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<span class="token number">2</span> boolea json-format <span class="token boolean">false</span> Option to support JS This option enables to <span class="token function">format</span> object outpu
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n ON <span class="token function">format</span> of object t with JSON when <span class="token parameter variable">-x</span> option selected.
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output
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<span class="token number">1</span> boolea disable-sub- <span class="token boolean">false</span> Option to control <span class="token keyword">in</span> This option disable to include sub class w
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n class clude sub class when hen matching class.
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class matching
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<span class="token number">1</span> boolea support-defa <span class="token boolean">true</span> Option to control <span class="token keyword">in</span> This option disable to include default met
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n ult-method clude default method hod <span class="token keyword">in</span> interface when matching class.
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<span class="token keyword">in</span> interface when c
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lass matching
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<span class="token number">1</span> boolea save-result <span class="token boolean">false</span> Option to print <span class="token function">comm</span> This option enables to save each <span class="token builtin class-name">command</span><span class="token string">'s
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n and'</span>s result to log result to log file, <span class="token function">which</span> path is <span class="token variable">${user.
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file home}</span>/logs/arthas-cache/result.log.
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<span class="token number">2</span> String job-timeout 1d Option to job timeou This option setting job timeout,The unit c
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t an be d, h, m, s <span class="token keyword">for</span> day, hour, minute, se
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cond. 1d is one day <span class="token keyword">in</span> default
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<span class="token number">1</span> boolea print-parent <span class="token boolean">true</span> Option to print all This option enables print files <span class="token keyword">in</span> parent
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n <span class="token parameter variable">-fields</span> fileds <span class="token keyword">in</span> parent cla class, default value true.
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ss
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<span class="token number">1</span> boolea verbose <span class="token boolean">false</span> Option to print verb This option enables print verbose informat
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n ose information ion, default value false.
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<span class="token number">1</span> boolea strict <span class="token boolean">true</span> Option to strict mod By default, strict mode is true, not allow
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n e ed to <span class="token builtin class-name">set</span> object properties. Want to <span class="token builtin class-name">set</span> o
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bject properties, execute <span class="token variable"><span class="token variable">`</span>options strict
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<span class="token boolean">false</span><span class="token variable">`</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 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><h2 id="获取-option-的值" tabindex="-1"><a class="header-anchor" href="#获取-option-的值" aria-hidden="true">#</a> 获取 option 的值</h2><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ options json-format
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LEVEL TYPE NAME VALUE SUMMARY DESCRIPTION
|
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--------------------------------------------------------------------------------------------
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2 bool json-format false Option to support This option enables to format object
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ean JSON format of obj output with JSON when -x option selec
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ect output ted.
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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></div><div class="custom-container tip"><p class="custom-container-title">提示</p><p>默认情况下<code>json-format</code>为 false，如果希望<code>watch</code>/<code>tt</code>等命令结果以 json 格式输出，则可以设置<code>json-format</code>为 true。</p></div><h2 id="设置指定的-option" tabindex="-1"><a class="header-anchor" href="#设置指定的-option" aria-hidden="true">#</a> 设置指定的 option</h2><p>例如，想打开执行结果存日志功能，输入如下命令即可：</p><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ options save-result true
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NAME BEFORE-VALUE AFTER-VALUE
|
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|
----------------------------------------
|
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save-result false true
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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></div><h2 id="打开-unsafe-开关-支持-jdk-package-下的类" tabindex="-1"><a class="header-anchor" href="#打开-unsafe-开关-支持-jdk-package-下的类" aria-hidden="true">#</a> 打开 unsafe 开关，支持 jdk package 下的类</h2><p>默认情况下，<code>watch</code>/<code>trace</code>/<code>tt</code>/<code>trace</code>/<code>monitor</code>等命令不支持<code>java.*</code> package 下的类。可以设置<code>unsafe</code>为 true，则可以增强。</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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NAME BEFORE-VALUE AFTER-VALUE
|
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|
-----------------------------------
|
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unsafe <span class="token boolean">false</span> <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 class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">watch</span> java.lang.invoke.Invokers callSiteForm
|
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Press Q or Ctrl+C to abort.
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|
Affect<span class="token punctuation">(</span>class count: <span class="token number">1</span> , method count: <span class="token number">1</span><span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">61</span> ms, listenerId: <span class="token number">1</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></div><h2 id="关闭-strict-模式-允许在-ognl-表达式里设置对象属性" tabindex="-1"><a class="header-anchor" href="#关闭-strict-模式-允许在-ognl-表达式里设置对象属性" aria-hidden="true">#</a> 关闭 strict 模式，允许在 ognl 表达式里设置对象属性</h2><div class="custom-container tip"><p class="custom-container-title">提示</p><p>since 3.6.0</p></div><p>对于新用户，在编写 ognl 表达式时，可能会出现误用。</p><p>比如对于<code>Student</code>，判断年龄等于 18 时，可能条件表达式会误写为<code>target.age=18</code>，这个表达式实际上是把当前对象的<code>age</code>设置为 18 了。正确的写法是<code>target.age==18</code>。</p><p>为了防止出现类似上面的误用，Arthas 默认启用<code>strict</code>模式，在<code>ognl</code>表达式里，禁止更新对象的 Property 或者调用<code>setter</code>函数。</p><p>以<code>MathGame</code>为例，会出现以下的错误提示。</p><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ watch demo.MathGame primeFactors 'target' 'target.illegalArgumentCount=1'
|
|
|
Press Q or Ctrl+C to abort.
|
|
|
Affect(class count: 1 , method count: 1) cost in 206 ms, listenerId: 1
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watch failed, condition is: target.illegalArgumentCount=1, express is: target, By default, strict mode is true, not allowed to set object properties. Want to set object properties, execute `options strict false`, visit /Users/admin/logs/arthas/arthas.log for more details.
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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></div><p>用户如果确定要在<code>ognl</code>表达式里更新对象，可以执行<code>options strict false</code>，关闭<code>strict</code>模式。</p><ul><li>更多信息参考： https://github.com/alibaba/arthas/issues/2128</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/options.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: zzilovey@gmail.com">qianmoke</span><!----><!--]--><!--]--></span></div></footer><nav class="page-nav right-menu-padding" data-v-fdd717e0><p class="inner"><span class="prev"><a href="/doc/ognl.html" class="" aria-label="ognl"><!--[--><!--]--> ognl <!--[--><!--]--></a></span><span class="next"><a href="/doc/perfcounter.html" class="" aria-label="perfcounter"><!--[--><!--]--> perfcounter <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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