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<div class="section" id="stack">
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<span id="stack"></span><h1>stack<a class="headerlink" href="#stack" title="Permalink to this headline">¶</a></h1>
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<blockquote>
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<div>Print out the full call stack of the current method.</div></blockquote>
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<p>Most often we know one method gets called, but we have no idea on which code path gets executed or when the method gets called since there are so many code paths to the target method. The command <code class="docutils literal notranslate"><span class="pre">stack</span></code> comes to rescue in this difficult situation.</p>
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<div class="section" id="parameters">
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<span id="parameters"></span><h2>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2>
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<table border="1" class="docutils">
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<thead>
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<tr>
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<th align="right">Name</th>
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<th align="left">Specification</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td align="right"><em>class-pattern</em></td>
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<td align="left">pattern for the class name</td>
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</tr>
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<tr>
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<td align="right"><em>method-pattern</em></td>
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<td align="left">pattern for the method name</td>
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</tr>
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<tr>
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<td align="right"><em>condition-expression</em></td>
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<td align="left">condition expression</td>
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</tr>
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<tr>
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<td align="right"><code>[E]</code></td>
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<td align="left">turn on regex match, the default behavior is wildcard match</td>
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</tr>
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<tr>
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<td align="right"><code>[n:]</code></td>
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<td align="left">execution times</td>
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</tr>
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</tbody>
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</table><p>There’s one thing worthy noting here is observation expression. The observation expression supports OGNL grammar, for example, you can come up a expression like this <code class="docutils literal notranslate"><span class="pre">"{params,returnObj}"</span></code>. All OGNL expressions are supported as long as they are legal to the grammar.</p>
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<p>Thanks for <code class="docutils literal notranslate"><span class="pre">advice</span></code>’s data structure, it is possible to observe from varieties of different angles. Inside <code class="docutils literal notranslate"><span class="pre">advice</span></code> parameter, all necessary information for notification can be found.</p>
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<p>Pls. refer to <a class="reference internal" href="advice-class.html"><span class="doc">core parameters in expression</span></a> for more details.</p>
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<ul class="simple">
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<li>Pls. also refer to <a class="reference external" href="https://github.com/alibaba/arthas/issues/71">https://github.com/alibaba/arthas/issues/71</a> for more advanced usage</li>
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<li>OGNL official site: <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>
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</ul>
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</div>
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<div class="section" id="usage">
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<span id="usage"></span><h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
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<blockquote>
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<div>Notes: if there’s quotes character (say, <code class="docutils literal notranslate"><span class="pre">'</span></code>) in the expression, then the whole expression must be wrapped by quotes but with the other type (in this case, <code class="docutils literal notranslate"><span class="pre">"</span></code>) too. On contrary, it’s no need to quote the expression itself if there’s no quotes character found in it, but it is strongly recommended.</div></blockquote>
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<p>Print out calling stack when the first method parameter is “K9-BD-01” for ‘getProductById()’ method:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ stack com.alibaba.sample.petstore.dal.dao.ProductDao getProductById <span class="s1">'params[0]=="K9-BD-01"'</span>
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Press Ctrl+C to abort.
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Affect<span class="o">(</span>class-cnt:1 , method-cnt:1<span class="o">)</span> cost in <span class="m">51</span> ms.
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<span class="nv">thread_name</span><span class="o">=</span><span class="s2">"http-bio-8080-exec-4"</span> <span class="nv">thread_id</span><span class="o">=</span>0x4a<span class="p">;</span><span class="nv">is_daemon</span><span class="o">=</span>true<span class="p">;</span><span class="nv">priority</span><span class="o">=</span><span class="m">5</span><span class="p">;</span>
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@com.alibaba.sample.petstore.dal.dao.ibatis.IbatisProductDao.getProductById<span class="o">()</span>
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at com.alibaba.sample.petstore.web.store.module.screen.ItemList.execute<span class="o">(</span>ItemList.java:50<span class="o">)</span>
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at com.alibaba.sample.petstore.web.store.module.screen.ItemList<span class="nv">$$</span>FastClassByCGLIB<span class="nv">$$</span>40b2f45f.invoke<span class="o">(</span><generated>:-1<span class="o">)</span>
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at net.sf.cglib.reflect.FastMethod.invoke<span class="o">(</span>FastMethod.java:53<span class="o">)</span>
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at com.alibaba.citrus.service.moduleloader.impl.adapter.MethodInvoker.invoke<span class="o">(</span>MethodInvoker.java:70<span class="o">)</span>
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at com.alibaba.citrus.service.moduleloader.impl.adapter.DataBindingAdapter.executeAndReturn<span class="o">(</span>DataBindingAdapter.java:41<span class="o">)</span>
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at com.alibaba.citrus.turbine.pipeline.valve.PerformScreenValve.performScreenModule<span class="o">(</span>PerformScreenValve.java:111<span class="o">)</span>
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at com.alibaba.citrus.turbine.pipeline.valve.PerformScreenValve.invoke<span class="o">(</span>PerformScreenValve.java:74<span class="o">)</span>
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at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
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at com.alibaba.citrus.turbine.pipeline.valve.PerformActionValve.invoke<span class="o">(</span>PerformActionValve.java:73<span class="o">)</span>
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at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
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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>
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......
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<span class="nv">thread_name</span><span class="o">=</span><span class="s2">"http-bio-8080-exec-2"</span> <span class="nv">thread_id</span><span class="o">=</span>0x48<span class="p">;</span><span class="nv">is_daemon</span><span class="o">=</span>true<span class="p">;</span><span class="nv">priority</span><span class="o">=</span><span class="m">5</span><span class="p">;</span>
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@com.alibaba.sample.petstore.dal.dao.ibatis.IbatisProductDao.getProductById<span class="o">()</span>
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at com.alibaba.sample.petstore.web.store.module.screen.ItemList.execute<span class="o">(</span>ItemList.java:50<span class="o">)</span>
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at com.alibaba.sample.petstore.web.store.module.screen.ItemList<span class="nv">$$</span>FastClassByCGLIB<span class="nv">$$</span>40b2f45f.invoke<span class="o">(</span><generated>:-1<span class="o">)</span>
|
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at net.sf.cglib.reflect.FastMethod.invoke<span class="o">(</span>FastMethod.java:53<span class="o">)</span>
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at com.alibaba.citrus.service.moduleloader.impl.adapter.MethodInvoker.invoke<span class="o">(</span>MethodInvoker.java:70<span class="o">)</span>
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at com.alibaba.citrus.service.moduleloader.impl.adapter.DataBindingAdapter.executeAndReturn<span class="o">(</span>DataBindingAdapter.java:41<span class="o">)</span>
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at com.alibaba.citrus.turbine.pipeline.valve.PerformScreenValve.performScreenModule<span class="o">(</span>PerformScreenValve.java:111<span class="o">)</span>
|
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at com.alibaba.citrus.turbine.pipeline.valve.PerformScreenValve.invoke<span class="o">(</span>PerformScreenValve.java:74<span class="o">)</span>
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at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
|
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|
at com.alibaba.citrus.turbine.pipeline.valve.PerformActionValve.invoke<span class="o">(</span>PerformActionValve.java:73<span class="o">)</span>
|
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|
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
|
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|
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invoke<span class="o">(</span>PipelineImpl.java:210<span class="o">)</span>
|
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|
at com.alibaba.citrus.service.pipeline.impl.valve.ChooseValve.invoke<span class="o">(</span>ChooseValve.java:98<span class="o">)</span>
|
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|
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
|
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...
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</pre></div>
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</div>
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<p>Print out the calling stack when method ‘execute()’ takes more than 30ms to finish:</p>
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|
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ stack com.alibaba.sample.petstore.web.store.module.screen.ItemList execute <span class="c1">#cost>30</span>
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Press Ctrl+C to abort.
|
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|
Affect<span class="o">(</span>class-cnt:1 , method-cnt:1<span class="o">)</span> cost in <span class="m">123</span> ms.
|
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stack com.alibaba.sample.petstore.web.store.module.screen.ItemList execute <span class="c1">#cost>30</span>
|
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|
<span class="nv">thread_name</span><span class="o">=</span>http-nio-8080-exec-10<span class="p">;</span><span class="nv">id</span><span class="o">=</span><span class="m">31</span><span class="p">;</span><span class="nv">is_daemon</span><span class="o">=</span>true<span class="p">;</span><span class="nv">priority</span><span class="o">=</span><span class="m">5</span><span class="p">;</span><span class="nv">TCCL</span><span class="o">=</span>com.taobao.pandora.boot.embedded.tomcat.TomcatEmbeddedWebappClassLoader
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@com.alibaba.sample.petstore.web.store.module.screen.ItemList.execute<span class="o">()</span>
|
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at com.alibaba.sample.petstore.web.store.module.screen.ItemList<span class="nv">$$</span>FastClassByCGLIB<span class="nv">$$</span>40b2f45f.invoke<span class="o">(</span><generated>:-1<span class="o">)</span>
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at net.sf.cglib.reflect.FastMethod.invoke<span class="o">(</span>FastMethod.java:53<span class="o">)</span>
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at com.alibaba.citrus.service.moduleloader.impl.adapter.MethodInvoker.invoke<span class="o">(</span>MethodInvoker.java:70<span class="o">)</span>
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|
at com.alibaba.citrus.service.moduleloader.impl.adapter.DataBindingAdapter.executeAndReturn<span class="o">(</span>DataBindingAdapter.java:41<span class="o">)</span>
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at com.alibaba.citrus.turbine.pipeline.valve.PerformScreenValve.performScreenModule<span class="o">(</span>PerformScreenValve.java:111<span class="o">)</span>
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at com.alibaba.citrus.turbine.pipeline.valve.PerformScreenValve.invoke<span class="o">(</span>PerformScreenValve.java:74<span class="o">)</span>
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at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
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at com.alibaba.citrus.turbine.pipeline.valve.PerformActionValve.invoke<span class="o">(</span>PerformActionValve.java:73<span class="o">)</span>
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at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
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at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invoke<span class="o">(</span>PipelineImpl.java:210<span class="o">)</span>
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at com.alibaba.citrus.service.pipeline.impl.valve.ChooseValve.invoke<span class="o">(</span>ChooseValve.java:98<span class="o">)</span>
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at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
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at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invoke<span class="o">(</span>PipelineImpl.java:210<span class="o">)</span>
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at com.alibaba.citrus.service.pipeline.impl.valve.LoopValve.invokeBody<span class="o">(</span>LoopValve.java:105<span class="o">)</span>
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at com.alibaba.citrus.service.pipeline.impl.valve.LoopValve.invoke<span class="o">(</span>LoopValve.java:83<span class="o">)</span>
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at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
|
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at com.alibaba.citrus.turbine.pipeline.valve.PageAuthorizationValve.invoke<span class="o">(</span>PageAuthorizationValve.java:105<span class="o">)</span>
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|
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at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$PipelineContextImpl</span>.invokeNext<span class="o">(</span>PipelineImpl.java:157<span class="o">)</span>
|
|
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at com.alibaba.citrus.turbine.pipeline.valve.CheckCsrfTokenValve.invoke<span class="o">(</span>CheckCsrfTokenValve.java:123<span class="o">)</span>
|
|
|
at com.alibaba.citrus.service.pipeline.impl.PipelineImpl<span class="nv">$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>
|
|
|
...
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