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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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dashboard <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/dump.html" class="sidebar-item" aria-label="dump" data-v-558ea87d><!--[--><!--]--> dump <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/echo.html" class="sidebar-item" aria-label="echo" data-v-558ea87d><!--[--><!--]--> echo <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/getstatic.html" class="sidebar-item" aria-label="getstatic" data-v-558ea87d><!--[--><!--]--> getstatic <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div 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data-v-558ea87d><!--[--><!--]--> Docker <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/web-console.html" class="sidebar-item" aria-label="Web Console" data-v-558ea87d><!--[--><!--]--> Web Console <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/tunnel.html" class="sidebar-item" aria-label="Arthas Tunnel" data-v-558ea87d><!--[--><!--]--> Arthas Tunnel <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/idea-plugin.html" class="sidebar-item" aria-label="IDEA Plugin" data-v-558ea87d><!--[--><!--]--> IDEA Plugin <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/arthas-properties.html" class="sidebar-item" aria-label="Arthas Properties" data-v-558ea87d><!--[--><!--]--> Arthas Properties <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/agent.html" class="sidebar-item" aria-label="以 Java Agent 的方式启动" data-v-558ea87d><!--[--><!--]--> 以 Java Agent 的方式启动 <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/spring-boot-starter.html" class="sidebar-item" aria-label="Arthas Spring Boot Starter" data-v-558ea87d><!--[--><!--]--> Arthas Spring Boot Starter <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/external-command.html" class="sidebar-item" aria-label="加载外部命令" data-v-558ea87d><!--[--><!--]--> 加载外部命令 <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/http-api.html" class="sidebar-item" aria-label="Http API" data-v-558ea87d><!--[--><!--]--> Http API <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/batch-support.html" class="sidebar-item" aria-label="批处理功能" data-v-558ea87d><!--[--><!--]--> 批处理功能 <!--[--><!--]--></a></div><!----></li><!--]--></ul></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/faq.html" class="sidebar-item" aria-label="FAQ" data-v-558ea87d><!--[--><!--]--> FAQ <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><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" data-v-558ea87d><!--[--><!--]--><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" 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class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/releases" rel="noopener noreferrer" target="_blank" aria-label="Release Notes" data-v-558ea87d><!--[--><!--]--><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></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/contact-us.md" class="sidebar-item" aria-label="QQ 群/钉钉群" data-v-558ea87d><!--[--><!--]--> QQ 群/钉钉群 <!--[--><!--]--></a></div><!----></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="line" tabindex="-1"><a class="header-anchor" href="#line" aria-hidden="true">#</a> line</h1><div class="custom-container tip"><p class="custom-container-title">提示</p><p>在指定源码行观察方法入参、局部变量和表达式结果。</p></div><p><code>line</code> 命令会在目标方法的指定源码行插入探针。当执行到该行时,Arthas 会输出当前线程、耗时、行号以及 OGNL 表达式结果。它适合排查“方法内部某一行变量值不符合预期”的问题。</p><div class="custom-container warning"><p class="custom-container-title">注意</p><p><code>line</code> 通过字节码增强实现。线上或预发环境使用时,请尽量明确 <code>--class</code>、<code>--method</code>、<code>--desc</code> 和 <code>--line</code>,并使用 <code>-n</code> 限制输出次数。诊断结束后可以执行 <code>reset</code> 或 <code>stop</code> 还原增强过的类。</p></div><h2 id="参数说明" tabindex="-1"><a class="header-anchor" href="#参数说明" aria-hidden="true">#</a> 参数说明</h2><table><thead><tr><th style="text-align:right;">参数名称</th><th style="text-align:left;">参数说明</th></tr></thead><tbody><tr><td style="text-align:right;"><code>--class &lt;class-pattern&gt;</code></td><td style="text-align:left;">需要观察的类名,必填,默认通配符匹配</td></tr><tr><td style="text-align:right;"><code>--method &lt;method-pattern&gt;</code></td><td style="text-align:left;">需要观察的方法名,可选,不指定时匹配类里的所有可插桩方法</td></tr><tr><td style="text-align:right;"><code>--desc &lt;method-desc&gt;</code></td><td style="text-align:left;">JVM 方法描述符,可选,用于区分重载方法,比如 <code>(I)Ljava/util/List;</code></td></tr><tr><td style="text-align:right;"><code>--line &lt;line&gt;</code></td><td style="text-align:left;">需要观察的源码行号,支持逗号分隔和重复指定,比如 <code>--line 51,57 --line 61</code></td></tr><tr><td style="text-align:right;"><code>--express &lt;express&gt;</code></td><td style="text-align:left;">观察表达式,默认值是 <code>{params, localVarMap}</code></td></tr><tr><td style="text-align:right;"><code>--condition &lt;express&gt;</code></td><td style="text-align:left;">条件表达式,条件成立时才输出</td></tr><tr><td style="text-align:right;"><code>--list-lines</code></td><td style="text-align:left;">只列出匹配方法的可用行号,不增强类</td></tr><tr><td style="text-align:right;"><code>[E]</code></td><td style="text-align:left;">开启正则表达式匹配,默认是通配符匹配</td></tr><tr><td style="text-align:right;"><code>[x:]</code></td><td style="text-align:left;">输出对象展开层级,默认值为 1</td></tr><tr><td style="text-align:right;"><code>[M:]</code></td><td style="text-align:left;">输出结果大小限制,默认使用 <code>options</code> 中的 <code>object-size-limit</code></td></tr><tr><td style="text-align:right;"><code>[n:]</code></td><td style="text-align:left;">执行次数限制,默认值为 100</td></tr><tr><td style="text-align:right;"><code>[c:]</code></td><td style="text-align:left;">指定 ClassLoader hash,只增强该 ClassLoader 加载的类</td></tr><tr><td style="text-align:right;"><code>[m &lt;arg&gt;]</code></td><td style="text-align:left;">指定 Class 最大匹配数量,默认值为 50。长格式为 <code>[maxMatch &lt;arg&gt;]</code></td></tr><tr><td style="text-align:right;"><code>--stack</code></td><td style="text-align:left;">命中行号时输出当前线程栈</td></tr><tr><td style="text-align:right;"><code>--stack-depth &lt;depth&gt;</code></td><td style="text-align:left;"><code>--stack</code> 的最大栈深度,默认值为 32,最大值为 256</td></tr></tbody></table><h2 id="表达式变量" tabindex="-1"><a class="header-anchor" href="#表达式变量" aria-hidden="true">#</a> 表达式变量</h2><p><code>line</code> 命令复用 Arthas 的 OGNL 表达式机制。常用变量如下:</p><table><thead><tr><th style="text-align:right;">变量</th><th style="text-align:left;">说明</th></tr></thead><tbody><tr><td style="text-align:right;"><code>params</code></td><td style="text-align:left;">方法入参数组</td></tr><tr><td style="text-align:right;"><code>target</code></td><td style="text-align:left;">当前对象,静态方法为 <code>null</code></td></tr><tr><td style="text-align:right;"><code>clazz</code></td><td style="text-align:left;">当前类</td></tr><tr><td style="text-align:right;"><code>method</code></td><td style="text-align:left;">当前方法信息</td></tr><tr><td style="text-align:right;"><code>lineNumber</code></td><td style="text-align:left;">当前命中的源码行号</td></tr><tr><td style="text-align:right;"><code>argNames</code></td><td style="text-align:left;">方法参数名数组,依赖目标类保留调试信息</td></tr><tr><td style="text-align:right;"><code>localVars</code> / <code>locals</code></td><td style="text-align:left;">当前行可见的局部变量值数组</td></tr><tr><td style="text-align:right;"><code>localVarNames</code></td><td style="text-align:left;">当前行可见的局部变量名数组</td></tr><tr><td style="text-align:right;"><code>localVarMap</code></td><td style="text-align:left;">局部变量名到变量值的映射</td></tr><tr><td style="text-align:right;"><code>#cost</code></td><td style="text-align:left;">从方法入口到当前行的耗时,单位为 ms</td></tr></tbody></table><p>局部变量名和值依赖目标类编译时保留 <code>LocalVariableTable</code> 调试信息。如果目标类没有调试信息,<code>localVarMap</code> 可能为空或不完整。</p><p>复杂的观察和条件表达式、空值处理及排错方法参见 <a href="/doc/ognl-express.html" class="">OGNL 复杂表达式使用技巧</a>。</p><h2 id="使用示例" tabindex="-1"><a class="header-anchor" href="#使用示例" aria-hidden="true">#</a> 使用示例</h2><h3 id="启动-demo" tabindex="-1"><a class="header-anchor" href="#启动-demo" aria-hidden="true">#</a> 启动 Demo</h3><p>启动<a href="/doc/quick-start.html" class="">快速入门</a>里的 <code>math-game</code>。</p><h3 id="查看可用行号" tabindex="-1"><a class="header-anchor" href="#查看可用行号" aria-hidden="true">#</a> 查看可用行号</h3><p>先使用 <code>--list-lines</code> 找到目标方法中可以插桩的源码行:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ line --list-lines <span class="token parameter variable">--class</span> demo.MathGame <span class="token parameter variable">--method</span> primeFactors
<span class="token assign-left variable">class</span><span class="token operator">=</span>demo.MathGame <span class="token assign-left variable">source</span><span class="token operator">=</span>MathGame.java
<span class="token assign-left variable">method</span><span class="token operator">=</span>primeFactors<span class="token punctuation">(</span>I<span class="token punctuation">)</span>Ljava/util/List<span class="token punctuation">;</span> <span class="token assign-left variable">lines</span><span class="token operator">=</span><span class="token punctuation">[</span><span class="token number">44</span>, <span class="token number">45</span>, <span class="token number">46</span>, <span class="token number">49</span>, <span class="token number">50</span>, <span class="token number">51</span>, <span class="token number">52</span>, <span class="token number">53</span>, <span class="token number">54</span>, <span class="token number">55</span>, <span class="token number">57</span>, <span class="token number">61</span><span class="token punctuation">]</span>
</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><h3 id="观察指定行的入参和局部变量" tabindex="-1"><a class="header-anchor" href="#观察指定行的入参和局部变量" aria-hidden="true">#</a> 观察指定行的入参和局部变量</h3><p>默认表达式为 <code>{params, localVarMap}</code>:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ line <span class="token parameter variable">--class</span> demo.MathGame <span class="token parameter variable">--method</span> primeFactors <span class="token parameter variable">--line</span> <span class="token number">51</span> <span class="token parameter variable">-n</span> <span class="token number">2</span> <span class="token parameter variable">-x</span> <span class="token number">2</span>
Press Q or Ctrl+C to abort.
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">32</span> ms, listenerId: <span class="token number">1</span>
<span class="token assign-left variable">ts</span><span class="token operator">=</span><span class="token number">2026</span>-06-08 01:45:56.111<span class="token punctuation">;</span> <span class="token punctuation">[</span>thread<span class="token operator">=</span>main<span class="token punctuation">(</span><span class="token number">3</span><span class="token punctuation">)</span> <span class="token assign-left variable">cost</span><span class="token operator">=</span><span class="token number">0</span>.937167ms<span class="token punctuation">]</span> demo.MathGame.primeFactors<span class="token punctuation">(</span>I<span class="token punctuation">)</span>Ljava/util/List<span class="token punctuation">;</span>:51
<span class="token assign-left variable">result</span><span class="token operator">=</span>@ArrayList<span class="token punctuation">[</span>
@Object<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span>
@Integer<span class="token punctuation">[</span><span class="token number">122542</span><span class="token punctuation">]</span>,
<span class="token punctuation">]</span>,
@LinkedHashMap<span class="token punctuation">[</span>
@String<span class="token punctuation">[</span>number<span class="token punctuation">]</span>:@Integer<span class="token punctuation">[</span><span class="token number">122542</span><span class="token punctuation">]</span>,
@String<span class="token punctuation">[</span>result<span class="token punctuation">]</span>:@ArrayList<span class="token punctuation">[</span>isEmpty<span class="token operator">=</span>true<span class="token punctuation">;</span><span class="token assign-left variable">size</span><span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">]</span>,
@String<span class="token punctuation">[</span>i<span class="token punctuation">]</span>:@Integer<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span>,
<span class="token punctuation">]</span>,
<span class="token punctuation">]</span>
Command execution <span class="token builtin class-name">times</span> exceed limit: <span class="token number">2</span>, so <span class="token builtin class-name">command</span> will exit. You can <span class="token builtin class-name">set</span> it with <span class="token parameter variable">-n</span> option.
</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></div><h3 id="一次观察多个行号" tabindex="-1"><a class="header-anchor" href="#一次观察多个行号" aria-hidden="true">#</a> 一次观察多个行号</h3><p><code>--line</code> 支持逗号分隔和重复指定:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>line <span class="token parameter variable">--class</span> demo.MathGame <span class="token parameter variable">--method</span> primeFactors <span class="token parameter variable">--line</span> <span class="token number">51,57</span> <span class="token parameter variable">--express</span> <span class="token string">&#39;{lineNumber, localVarMap}&#39;</span> <span class="token parameter variable">-n</span> <span class="token number">4</span> <span class="token parameter variable">-x</span> <span class="token number">2</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>第一版只支持精确行号列表,不支持 <code>51-57</code> 这类范围语法。</p><h3 id="使用条件表达式过滤" tabindex="-1"><a class="header-anchor" href="#使用条件表达式过滤" aria-hidden="true">#</a> 使用条件表达式过滤</h3><p>只在局部变量 <code>i</code> 大于 10 时输出:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>line <span class="token parameter variable">--class</span> demo.MathGame <span class="token parameter variable">--method</span> primeFactors <span class="token parameter variable">--line</span> <span class="token number">51</span> <span class="token punctuation">\</span>
<span class="token parameter variable">--condition</span> <span class="token string">&#39;localVarMap[&quot;i&quot;] != null &amp;&amp; localVarMap[&quot;i&quot;] &gt; 10&#39;</span> <span class="token punctuation">\</span>
<span class="token parameter variable">--express</span> <span class="token string">&#39;{params[0], localVarMap[&quot;i&quot;], localVarMap[&quot;result&quot;]}&#39;</span> <span class="token parameter variable">-n</span> <span class="token number">1</span> <span class="token parameter variable">-x</span> <span class="token number">2</span>
</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><h3 id="指定方法描述符" tabindex="-1"><a class="header-anchor" href="#指定方法描述符" aria-hidden="true">#</a> 指定方法描述符</h3><p>当方法重载时,建议使用 <code>--desc</code> 精确指定 JVM 方法描述符:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>line <span class="token parameter variable">--class</span> demo.MathGame <span class="token parameter variable">--method</span> primeFactors <span class="token parameter variable">--desc</span> <span class="token string">&#39;(I)Ljava/util/List;&#39;</span> <span class="token parameter variable">--line</span> <span class="token number">51</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>可以通过 <code>sm -d demo.MathGame primeFactors</code> 查看方法描述符。</p><h3 id="输出当前线程栈" tabindex="-1"><a class="header-anchor" href="#输出当前线程栈" aria-hidden="true">#</a> 输出当前线程栈</h3><p>命中行号时输出当前线程栈:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>line <span class="token parameter variable">--class</span> demo.MathGame <span class="token parameter variable">--method</span> primeFactors <span class="token parameter variable">--line</span> <span class="token number">57</span> <span class="token parameter variable">--stack</span> --stack-depth <span class="token number">8</span> <span class="token parameter variable">-n</span> <span class="token number">1</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h2 id="注意事项" tabindex="-1"><a class="header-anchor" href="#注意事项" aria-hidden="true">#</a> 注意事项</h2><ul><li><code>--line</code> 传入的行号必须大于 0,并且最多指定 256 个不同的行号。</li><li><code>line</code> 会跳过构造方法、类初始化方法、native 方法和 abstract 方法。</li><li>如果省略 <code>--method</code>,同一个类里多个包含目标行号的方法都可能被增强,建议先用 <code>--list-lines</code> 和 <code>--desc</code> 收敛目标。</li><li>如果目标类没有 <code>LineNumberTable</code>,<code>--list-lines</code> 不会列出可用行号,<code>line</code> 也无法在源码行插入探针。</li><li>重复执行同一个行号不会重复插入相同探针;新增行号时会尽量只追加缺失的行号探针。</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/line.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></div></footer><nav class="page-nav right-menu-padding" data-v-fdd717e0><p class="inner"><span class="prev"><a href="/doc/keymap.html" class="" aria-label="keymap"><!--[--><!--]--> keymap <!--[--><!--]--></a></span><span class="next"><a href="/doc/logger.html" class="" aria-label="logger"><!--[--><!--]--> logger <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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