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<li class="toctree-l2 current"><a class="current reference internal" href="#">watch</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#">参数说明</a></li>
<li class="toctree-l3"><a class="reference internal" href="#">使用参考</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#">观察方法出参和返回值</a></li>
<li class="toctree-l4"><a class="reference internal" href="#">观察方法入参</a></li>
<li class="toctree-l4"><a class="reference internal" href="#">同时观察方法调用前和方法返回后</a></li>
<li class="toctree-l4"><a class="reference internal" href="#x">调整<code class="docutils literal notranslate"><span class="pre">-x</span></code>的值，观察具体的方法参数值</a></li>
<li class="toctree-l4"><a class="reference internal" href="#">条件表达式的例子</a></li>
<li class="toctree-l4"><a class="reference internal" href="#">观察异常信息的例子</a></li>
<li class="toctree-l4"><a class="reference internal" href="#">按照耗时进行过滤</a></li>
<li class="toctree-l4"><a class="reference internal" href="#">观察当前对象中的全局属性</a></li>
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<div class="section" id="watch">
<span id="watch"></span><h1>watch<a class="headerlink" href="#watch" title="永久链接至标题">¶</a></h1>
<blockquote>
<div>方法执行数据观测</div></blockquote>
<p>让你能方便的观察到指定方法的调用情况。能观察到的范围为：<code class="docutils literal notranslate"><span class="pre">返回值</span></code>、<code class="docutils literal notranslate"><span class="pre">抛出异常</span></code>、<code class="docutils literal notranslate"><span class="pre">入参</span></code>，通过编写 OGNL 表达式进行对应变量的查看。</p>
<div class="section" id="">
<span id="id1"></span><h2>参数说明<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
<p>watch 的参数比较多，主要是因为它能在 4 个不同的场景观察对象</p>
<table border="1" class="docutils">
<thead>
<tr>
<th align="right">参数名称</th>
<th align="left">参数说明</th>
</tr>
</thead>
<tbody>
<tr>
<td align="right"><em>class-pattern</em></td>
<td align="left">类名表达式匹配</td>
</tr>
<tr>
<td align="right"><em>method-pattern</em></td>
<td align="left">方法名表达式匹配</td>
</tr>
<tr>
<td align="right"><em>express</em></td>
<td align="left">观察表达式</td>
</tr>
<tr>
<td align="right"><em>condition-express</em></td>
<td align="left">条件表达式</td>
</tr>
<tr>
<td align="right">[b]</td>
<td align="left">在<strong>方法调用之前</strong>观察</td>
</tr>
<tr>
<td align="right">[e]</td>
<td align="left">在<strong>方法异常之后</strong>观察</td>
</tr>
<tr>
<td align="right">[s]</td>
<td align="left">在<strong>方法返回之后</strong>观察</td>
</tr>
<tr>
<td align="right">[f]</td>
<td align="left">在<strong>方法结束之后</strong>(正常返回和异常返回)观察</td>
</tr>
<tr>
<td align="right">[E]</td>
<td align="left">开启正则表达式匹配，默认为通配符匹配</td>
</tr>
<tr>
<td align="right">[x:]</td>
<td align="left">指定输出结果的属性遍历深度，默认为 1</td>
</tr>
</tbody>
</table><p>这里重点要说明的是观察表达式，观察表达式的构成主要由 ognl 表达式组成，所以你可以这样写<code class="docutils literal notranslate"><span class="pre">"{params,returnObj}"</span></code>，只要是一个合法的 ognl 表达式，都能被正常支持。</p>
<p>观察的维度也比较多，主要体现在参数 <code class="docutils literal notranslate"><span class="pre">advice</span></code> 的数据结构上。<code class="docutils literal notranslate"><span class="pre">Advice</span></code> 参数最主要是封装了通知节点的所有信息。请参考<a class="reference internal" href="advice-class.html"><span class="doc">表达式核心变量</span></a>中关于该节点的描述。</p>
<ul class="simple">
<li>特殊用法请参考：<a class="reference external" href="https://github.com/alibaba/arthas/issues/71">https://github.com/alibaba/arthas/issues/71</a></li>
<li>OGNL表达式官网：<a class="reference external" href="https://commons.apache.org/proper/commons-ognl/language-guide.html">https://commons.apache.org/proper/commons-ognl/language-guide.html</a></li>
</ul>
<p><strong>特别说明</strong>：</p>
<ul class="simple">
<li>watch 命令定义了4个观察事件点，即 <code class="docutils literal notranslate"><span class="pre">-b</span></code> 方法调用前，<code class="docutils literal notranslate"><span class="pre">-e</span></code> 方法异常后，<code class="docutils literal notranslate"><span class="pre">-s</span></code> 方法返回后和 <code class="docutils literal notranslate"><span class="pre">-f</span></code> 方法结束后</li>
<li>4个观察事件点 <code class="docutils literal notranslate"><span class="pre">-b</span></code>、<code class="docutils literal notranslate"><span class="pre">-e</span></code>、<code class="docutils literal notranslate"><span class="pre">-s</span></code> 默认关闭，<code class="docutils literal notranslate"><span class="pre">-f</span></code> 默认打开，当指定观察点被打开后，在相应事件点会对观察表达式进行求值并输出</li>
<li>这里要注意<code class="docutils literal notranslate"><span class="pre">方法入参</span></code>和<code class="docutils literal notranslate"><span class="pre">方法出参</span></code>的区别，有可能在中间被修改导致前后不一致，除了 <code class="docutils literal notranslate"><span class="pre">-b</span></code> 事件点 <code class="docutils literal notranslate"><span class="pre">params</span></code> 代表方法入参外，其余事件都代表方法出参</li>
<li>当使用 <code class="docutils literal notranslate"><span class="pre">-b</span></code> 时，由于观察事件点是在方法调用前，此时返回值或异常均不存在</li>
</ul>
</div>
<div class="section" id="">
<span id="id2"></span><h2>使用参考<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
<p>代码示例：</p>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span> <span class="kd">public</span> <span class="kt">void</span> <span class="nf">execute</span><span class="o">()</span> <span class="o">{</span>
<span class="n">List</span><span class="o"><</span><span class="n">String</span><span class="o">></span> <span class="n">list</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o"><</span><span class="n">String</span><span class="o">>();</span>
<span class="n">list</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="s">"a"</span><span class="o">);</span>
<span class="n">list</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="s">"b"</span><span class="o">);</span>
<span class="n">List</span><span class="o"><</span><span class="n">String</span><span class="o">></span> <span class="n">list2</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o"><</span><span class="n">String</span><span class="o">>();</span>
<span class="n">list2</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="s">"c"</span><span class="o">);</span>
<span class="n">list2</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="s">"d"</span><span class="o">);</span>
<span class="kt">int</span> <span class="n">len</span> <span class="o">=</span> <span class="n">add</span><span class="o">(</span><span class="n">list</span><span class="o">,</span> <span class="n">list2</span><span class="o">);</span>
<span class="o">}</span>
<span class="kd">private</span> <span class="kd">static</span> <span class="kt">int</span> <span class="nf">add</span><span class="o">(</span><span class="n">List</span><span class="o"><</span><span class="n">String</span><span class="o">></span> <span class="n">list</span><span class="o">,</span> <span class="n">List</span><span class="o"><</span><span class="n">String</span><span class="o">></span> <span class="n">list2</span><span class="o">)</span> <span class="o">{</span>
<span class="n">list</span><span class="o">.</span><span class="na">addAll</span><span class="o">(</span><span class="n">list2</span><span class="o">);</span>
<span class="k">return</span> <span class="n">list</span><span class="o">.</span><span class="na">size</span><span class="o">();</span>
<span class="o">}</span>
</pre></div>
</div>
<div class="section" id="">
<span id="id3"></span><h3>观察方法出参和返回值<a class="headerlink" href="#" title="永久链接至标题">¶</a></h3>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ watch com.alibaba.sample.petstore.web.store.module.screen.ItemList add <span class="s2">"{params,returnObj}"</span> -x <span class="m">2</span>
Press Ctrl+C to abort.
Affect<span class="o">(</span>class-cnt:1 , method-cnt:1<span class="o">)</span> cost in <span class="m">44</span> ms.
@ArrayList<span class="o">[</span>
@Object<span class="o">[][</span>
@ArrayList<span class="o">[</span><span class="nv">isEmpty</span><span class="o">=</span>false<span class="p">;</span><span class="nv">size</span><span class="o">=</span><span class="m">4</span><span class="o">]</span>,
@ArrayList<span class="o">[</span><span class="nv">isEmpty</span><span class="o">=</span>false<span class="p">;</span><span class="nv">size</span><span class="o">=</span><span class="m">2</span><span class="o">]</span>,
<span class="o">]</span>,
@Integer<span class="o">[</span><span class="m">4</span><span class="o">]</span>,
<span class="o">]</span>
</pre></div>
</div>
</div>
<div class="section" id="">
<span id="id4"></span><h3>观察方法入参<a class="headerlink" href="#" title="永久链接至标题">¶</a></h3>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ watch com.alibaba.sample.petstore.web.store.module.screen.ItemList add <span class="s2">"{params,returnObj}"</span> -x <span class="m">2</span> -b
Press Ctrl+C to abort.
Affect<span class="o">(</span>class-cnt:1 , method-cnt:1<span class="o">)</span> cost in <span class="m">48</span> ms.
@ArrayList<span class="o">[</span>
@Object<span class="o">[][</span>
@ArrayList<span class="o">[</span><span class="nv">isEmpty</span><span class="o">=</span>false<span class="p">;</span><span class="nv">size</span><span class="o">=</span><span class="m">2</span><span class="o">]</span>,
@ArrayList<span class="o">[</span><span class="nv">isEmpty</span><span class="o">=</span>false<span class="p">;</span><span class="nv">size</span><span class="o">=</span><span class="m">2</span><span class="o">]</span>,
<span class="o">]</span>,
null,
<span class="o">]</span>
</pre></div>
</div>
<blockquote>
<div>对比前一个例子，params[0] 其size为2（入参），返回值为空（事件点为方法执行前，因此获取不到返回值）</div></blockquote>
</div>
<div class="section" id="">
<span id="id5"></span><h3>同时观察方法调用前和方法返回后<a class="headerlink" href="#" title="永久链接至标题">¶</a></h3>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ watch com.alibaba.sample.petstore.web.store.module.screen.ItemList add <span class="s2">"{params,returnObj}"</span> -x <span class="m">2</span> -b -s
Press Ctrl+C to abort.
Affect<span class="o">(</span>class-cnt:1 , method-cnt:1<span class="o">)</span> cost in <span class="m">59</span> ms.
@ArrayList<span class="o">[</span>
@Object<span class="o">[][</span>
@ArrayList<span class="o">[</span><span class="nv">isEmpty</span><span class="o">=</span>false<span class="p">;</span><span class="nv">size</span><span class="o">=</span><span class="m">2</span><span class="o">]</span>,
@ArrayList<span class="o">[</span><span class="nv">isEmpty</span><span class="o">=</span>false<span class="p">;</span><span class="nv">size</span><span class="o">=</span><span class="m">2</span><span class="o">]</span>,
<span class="o">]</span>,
null,
<span class="o">]</span>
@ArrayList<span class="o">[</span>
@Object<span class="o">[][</span>
@ArrayList<span class="o">[</span><span class="nv">isEmpty</span><span class="o">=</span>false<span class="p">;</span><span class="nv">size</span><span class="o">=</span><span class="m">4</span><span class="o">]</span>,
@ArrayList<span class="o">[</span><span class="nv">isEmpty</span><span class="o">=</span>false<span class="p">;</span><span class="nv">size</span><span class="o">=</span><span class="m">2</span><span class="o">]</span>,
<span class="o">]</span>,
@Integer<span class="o">[</span><span class="m">4</span><span class="o">]</span>,
<span class="o">]</span>
</pre></div>
</div>
<blockquote>
<div>这里输出结果中，第一次输出的是方法调用前的观察表达式的结果，第二次输出的是方法返回后的表达式的结果</div></blockquote>
<blockquote>
<div>结果的顺序和命令中 <code class="docutils literal notranslate"><span class="pre">-s</span> <span class="pre">-b</span></code> 的顺序没有关系，只与事件本身的先后顺序有关</div></blockquote>
</div>
<div class="section" id="x">
<span id="x"></span><h3>调整<code class="docutils literal notranslate"><span class="pre">-x</span></code>的值，观察具体的方法参数值<a class="headerlink" href="#x" title="永久链接至标题">¶</a></h3>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ watch com.alibaba.sample.petstore.web.store.module.screen.ItemList add <span class="s2">"{params,returnObj}"</span> -x <span class="m">3</span>
Press Ctrl+C to abort.
Affect<span class="o">(</span>class-cnt:1 , method-cnt:1<span class="o">)</span> cost in <span class="m">59</span> ms.
@ArrayList<span class="o">[</span>
@Object<span class="o">[][</span>
@ArrayList<span class="o">[</span>
@String<span class="o">[</span>a<span class="o">]</span>,
@String<span class="o">[</span>b<span class="o">]</span>,
@String<span class="o">[</span>c<span class="o">]</span>,
@String<span class="o">[</span>d<span class="o">]</span>,
<span class="o">]</span>,
@ArrayList<span class="o">[</span>
@String<span class="o">[</span>c<span class="o">]</span>,
@String<span class="o">[</span>d<span class="o">]</span>,
<span class="o">]</span>,
<span class="o">]</span>,
@Integer<span class="o">[</span><span class="m">4</span><span class="o">]</span>,
<span class="o">]</span>
</pre></div>
</div>
<blockquote>
<div><code class="docutils literal notranslate"><span class="pre">-x</span></code>表示遍历深度，可以调整来打印具体的参数和结果内容。</div></blockquote>
</div>
<div class="section" id="">
<span id="id6"></span><h3>条件表达式的例子<a class="headerlink" href="#" title="永久链接至标题">¶</a></h3>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ watch com.alibaba.sample.petstore.biz.impl.UserManagerImpl testAdd <span class="s2">"{params, returnObj}"</span> <span class="s2">"params[0].equals('aaa')"</span> -x <span class="m">2</span>
Press Ctrl+C to abort.
Affect<span class="o">(</span>class-cnt:1 , method-cnt:1<span class="o">)</span> cost in <span class="m">29</span> ms.
@ArrayList<span class="o">[</span>
@Object<span class="o">[][</span>
@String<span class="o">[</span>aaa<span class="o">]</span>,
@String<span class="o">[</span>bbb<span class="o">]</span>,
<span class="o">]</span>,
@Integer<span class="o">[</span><span class="m">6</span><span class="o">]</span>,
<span class="o">]</span>
</pre></div>
</div>
<blockquote>
<div>只有满足条件的调用，才会有响应。</div></blockquote>
</div>
<div class="section" id="">
<span id="id7"></span><h3>观察异常信息的例子<a class="headerlink" href="#" title="永久链接至标题">¶</a></h3>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ watch com.alibaba.sample.petstore.biz.impl.UserManagerImpl testAdd <span class="s2">"{params, throwExp}"</span> -e -x <span class="m">2</span>
Press Ctrl+C to abort.
Affect<span class="o">(</span>class-cnt:1 , method-cnt:1<span class="o">)</span> cost in <span class="m">29</span> ms.
@ArrayList<span class="o">[</span>
@Object<span class="o">[][</span>
@String<span class="o">[</span>aaa<span class="o">]</span>,
@String<span class="o">[</span>bbb<span class="o">]</span>,
<span class="o">]</span>,
java.lang.NullPointerException
at com.alibaba.sample.petstore.biz.impl.UserManagerImpl.testAdd<span class="o">(</span>UserManagerImpl.java:75<span class="o">)</span>
at com.alibaba.sample.petstore.biz.impl.UserManagerImpl.register<span class="o">(</span>UserManagerImpl.java:60<span class="o">)</span>
at com.alibaba.sample.petstore.web.user.module.action.RegisterAction.doRegister<span class="o">(</span>RegisterAction.java:45<span class="o">)</span>
at com.alibaba.sample.petstore.web.user.module.action.RegisterAction<span class="nv">$$</span>FastClassByCGLIB<span class="nv">$$</span>ad5428f1.invoke<span class="o">(</span><generated><span class="o">)</span>
at net.sf.cglib.reflect.FastMethod.invoke<span class="o">(</span>FastMethod.java:53<span class="o">)</span>
at com.alibaba.citrus.service.moduleloader.impl.adapter.MethodInvoker.invoke<span class="o">(</span>MethodInvoker.java:70<span class="o">)</span>
at com.alibaba.citrus.service.moduleloader.impl.adapter.AbstractModuleEventAdapter.executeAndReturn<span class="o">(</span>AbstractModuleEventAdapter.java:100<span class="o">)</span>
at com.alibaba.citrus.service.moduleloader.impl.adapter.AbstractModuleEventAdapter.execute<span class="o">(</span>AbstractModuleEventAdapter.java:58<span class="o">)</span>
at com.alibaba.citrus.turbine.pipeline.valve.PerformActionValve.invoke<span class="o">(</span>PerformActionValve.java:63<span class="o">)</span>
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invoke<span class="o">(</span>PipelineImpl.java:210<span class="o">)</span>
at com.alibaba.citrus.service.pipeline.impl.valve.ChooseValve.invoke<span class="o">(</span>ChooseValve.java:98<span class="o">)</span>
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invoke<span class="o">(</span>PipelineImpl.java:210<span class="o">)</span>
at com.alibaba.citrus.service.pipeline.impl.valve.LoopValve.invokeBody<span class="o">(</span>LoopValve.java:105<span class="o">)</span>
at com.alibaba.citrus.service.pipeline.impl.valve.LoopValve.invoke<span class="o">(</span>LoopValve.java:83<span class="o">)</span>
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
at com.alibaba.citrus.turbine.pipeline.valve.PageAuthorizationValve.invoke<span class="o">(</span>PageAuthorizationValve.java:105<span class="o">)</span>
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
at com.alibaba.citrus.turbine.pipeline.valve.CheckCsrfTokenValve.invoke<span class="o">(</span>CheckCsrfTokenValve.java:123<span class="o">)</span>
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
at com.alibaba.citrus.turbine.pipeline.valve.AnalyzeURLValve.invoke<span class="o">(</span>AnalyzeURLValve.java:126<span class="o">)</span>
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
at com.alibaba.citrus.turbine.pipeline.valve.SetLoggingContextValve.invoke<span class="o">(</span>SetLoggingContextValve.java:66<span class="o">)</span>
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
at com.alibaba.citrus.turbine.pipeline.valve.PrepareForTurbineValve.invoke<span class="o">(</span>PrepareForTurbineValve.java:52<span class="o">)</span>
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invoke<span class="o">(</span>PipelineImpl.java:210<span class="o">)</span>
at com.alibaba.citrus.webx.impl.WebxControllerImpl.service<span class="o">(</span>WebxControllerImpl.java:43<span class="o">)</span>
at com.alibaba.citrus.webx.impl.WebxRootControllerImpl.handleRequest<span class="o">(</span>WebxRootControllerImpl.java:53<span class="o">)</span>
at com.alibaba.citrus.webx.support.AbstractWebxRootController.service<span class="o">(</span>AbstractWebxRootController.java:165<span class="o">)</span>
at com.alibaba.citrus.webx.servlet.WebxFrameworkFilter.doFilter<span class="o">(</span>WebxFrameworkFilter.java:152<span class="o">)</span>
at com.alibaba.citrus.webx.servlet.FilterBean.doFilter<span class="o">(</span>FilterBean.java:148<span class="o">)</span>
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter<span class="o">(</span>ApplicationFilterChain.java:241<span class="o">)</span>
at org.apache.catalina.core.ApplicationFilterChain.doFilter<span class="o">(</span>ApplicationFilterChain.java:208<span class="o">)</span>
at com.alibaba.citrus.webx.servlet.SetLoggingContextFilter.doFilter<span class="o">(</span>SetLoggingContextFilter.java:61<span class="o">)</span>
at com.alibaba.citrus.webx.servlet.FilterBean.doFilter<span class="o">(</span>FilterBean.java:148<span class="o">)</span>
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter<span class="o">(</span>ApplicationFilterChain.java:241<span class="o">)</span>
at org.apache.catalina.core.ApplicationFilterChain.doFilter<span class="o">(</span>ApplicationFilterChain.java:208<span class="o">)</span>
at org.apache.catalina.core.StandardWrapperValve.invoke<span class="o">(</span>StandardWrapperValve.java:220<span class="o">)</span>
at org.apache.catalina.core.StandardContextValve.invoke<span class="o">(</span>StandardContextValve.java:122<span class="o">)</span>
at com.taobao.tomcat.valves.ContextLoadFilterValve.invoke<span class="o">(</span>ContextLoadFilterValve.java:152<span class="o">)</span>
at org.apache.catalina.core.StandardHostValve.invoke<span class="o">(</span>StandardHostValve.java:170<span class="o">)</span>
at org.apache.catalina.valves.ErrorReportValve.invoke<span class="o">(</span>ErrorReportValve.java:103<span class="o">)</span>
at org.apache.catalina.core.StandardEngineValve.invoke<span class="o">(</span>StandardEngineValve.java:116<span class="o">)</span>
at org.apache.catalina.connector.CoyoteAdapter.service<span class="o">(</span>CoyoteAdapter.java:429<span class="o">)</span>
at org.apache.coyote.http11.AbstractHttp11Processor.process<span class="o">(</span>AbstractHttp11Processor.java:1085<span class="o">)</span>
at org.apache.coyote.AbstractProtocol<span class="nv">$AbstractConnectionHandler</span>.process<span class="o">(</span>AbstractProtocol.java:625<span class="o">)</span>
at org.apache.tomcat.util.net.NioEndpoint<span class="nv">$SocketProcessor</span>.doRun<span class="o">(</span>NioEndpoint.java:1760<span class="o">)</span>
at org.apache.tomcat.util.net.NioEndpoint<span class="nv">$SocketProcessor</span>.run<span class="o">(</span>NioEndpoint.java:1719<span class="o">)</span>
at java.util.concurrent.ThreadPoolExecutor.runWorker<span class="o">(</span>ThreadPoolExecutor.java:1142<span class="o">)</span>
at java.util.concurrent.ThreadPoolExecutor<span class="nv">$Worker</span>.run<span class="o">(</span>ThreadPoolExecutor.java:617<span class="o">)</span>
at org.apache.tomcat.util.threads.TaskThread<span class="nv">$WrappingRunnable</span>.run<span class="o">(</span>TaskThread.java:61<span class="o">)</span>
at java.lang.Thread.run<span class="o">(</span>Thread.java:745<span class="o">)</span>,
<span class="o">]</span>
</pre></div>
</div>
<blockquote>
<div>express中，表示异常信息的变量是<code class="docutils literal notranslate"><span class="pre">throwExp</span></code></div></blockquote>
</div>
<div class="section" id="">
<span id="id8"></span><h3>按照耗时进行过滤<a class="headerlink" href="#" title="永久链接至标题">¶</a></h3>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ watch com.alibaba.sample.petstore.web.store.module.screen.ItemList add <span class="s2">"{params,returnObj}"</span> <span class="c1">#cost>200 -x 3 </span>
Press Ctrl+C to abort.
Affect<span class="o">(</span>class-cnt:1 , method-cnt:1<span class="o">)</span> cost in <span class="m">59</span> ms.
@ArrayList<span class="o">[</span>
@Object<span class="o">[][</span>
@ArrayList<span class="o">[</span>
@String<span class="o">[</span>a<span class="o">]</span>,
@String<span class="o">[</span>b<span class="o">]</span>,
@String<span class="o">[</span>c<span class="o">]</span>,
@String<span class="o">[</span>d<span class="o">]</span>,
<span class="o">]</span>,
@ArrayList<span class="o">[</span>
@String<span class="o">[</span>c<span class="o">]</span>,
@String<span class="o">[</span>d<span class="o">]</span>,
<span class="o">]</span>,
<span class="o">]</span>,
@Integer<span class="o">[</span><span class="m">4</span><span class="o">]</span>,
<span class="o">]</span>
</pre></div>
</div>
<blockquote>
<div>#cost>200(单位是<code class="docutils literal notranslate"><span class="pre">ms</span></code>)表示只有当耗时大于200ms时才会输出，过滤掉执行时间小于200ms的调用</div></blockquote>
</div>
<div class="section" id="">
<span id="id9"></span><h3>观察当前对象中的全局属性<a class="headerlink" href="#" title="永久链接至标题">¶</a></h3>
<p>如果想查看方法运行前后，当前对象中的全局属性，可以使用<code class="docutils literal notranslate"><span class="pre">target</span></code>关键字，代表当前对象</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ watch com.taobao.container.web.arthas.rest.MyAppsController myFavoriteApps 'target'
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 128 ms.
ts=2017-10-31 18:45:55;result=@MyAppsController[
myFavAppsMapper=@$Proxy131[org.apache.ibatis.binding.MapperProxy@563e97f3],
getAppNameAndIdByEmpId=@$Proxy135[HardCodedTarget(type=GetAppNameAndIdByEmpId, url=http://hello.com)],
enableWebConsoleAppsMapper=@$Proxy132[org.apache.ibatis.binding.MapperProxy@7d51e4a8],
]
</pre></div>
</div>
<p>然后使用<code class="docutils literal notranslate"><span class="pre">target.field_name</span></code>访问当前对象的某个全局属性</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ watch com.taobao.container.web.arthas.rest.MyAppsController myFavoriteApps 'target.myFavAppsMapper'
Press Ctrl+C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 126 ms.
ts=2017-10-31 18:46:17;result=@$Proxy131[
m1=@Method[public boolean java.lang.Object.equals(java.lang.Object)],
m2=@Method[public java.lang.String java.lang.Object.toString()],
m5=@Method[public abstract java.util.List com.taobao.container.dal.arthas.mapper.MyFavAppsMapper.listFavApps(java.util.Map)],
m3=@Method[public abstract int com.taobao.container.dal.arthas.mapper.MyFavAppsMapper.delete(java.lang.String,java.lang.String,java.lang.String)],
m4=@Method[public abstract long com.taobao.container.dal.arthas.mapper.MyFavAppsMapper.insert(com.taobao.container.dal.arthas.domain.MyFavAppsDO)],
m0=@Method[public native int java.lang.Object.hashCode()],
]
</pre></div>
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