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3.0.5-SNAPSHOT
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<div class="section" id="advanced-usage">
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<span id="advanced-usage"></span><h1>Advanced Usage<a class="headerlink" href="#advanced-usage" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="basic">
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<span id="basic"></span><h2>Basic<a class="headerlink" href="#basic" title="Permalink to this headline">¶</a></h2>
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<ul class="simple">
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<li>help - show help info</li>
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<li>cls - clear out the current screen</li>
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<li>session - check details of the current session</li>
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<li><a class="reference internal" href="reset.html"><span class="doc">reset</span></a> - reset all injected/enhanced classes</li>
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<li>version - print the version of the Arthas attaching to the current target process</li>
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<li>quit/exit - exit the current Arthas client without affecting other clients</li>
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<li>shutdown - terminate the Arthas server and all clients</li>
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</ul>
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<div class="section" id="jvm">
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<span id="jvm"></span><h2>JVM<a class="headerlink" href="#jvm" title="Permalink to this headline">¶</a></h2>
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<ul class="simple">
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<li><a class="reference internal" href="dashboard.html"><span class="doc">dashboard</span></a> - real-time dashboard for the current system</li>
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<li><a class="reference internal" href="thread.html"><span class="doc">thread</span></a> - thread profile</li>
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<li><a class="reference internal" href="jvm.html"><span class="doc">jvm</span></a> - JVM profile</li>
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<li><a class="reference internal" href="sysprop.html"><span class="doc">sysprop</span></a> - check or modify JVM system properties</li>
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<li><strong>New!</strong> <a class="reference internal" href="getstatic.html"><span class="doc">getstatic</span></a> :clap: - check the static properties of classes</li>
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</ul>
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<div class="section" id="class-classloader">
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<span id="class-classloader"></span><h2>class/classloader<a class="headerlink" href="#class-classloader" title="Permalink to this headline">¶</a></h2>
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<ul class="simple">
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<li><a class="reference internal" href="sc.html"><span class="doc">sc</span></a> - check profiles of the classes loaded by JVM</li>
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<li><a class="reference internal" href="sm.html"><span class="doc">sm</span></a> - check methods’ profile</li>
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<li><a class="reference internal" href="dump.html"><span class="doc">dump</span></a> - dump out the byte code of the loaded classes to specified location</li>
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<li><a class="reference internal" href="redefine.html"><span class="doc">redefine</span></a> - load external <code class="docutils literal notranslate"><span class="pre">*.class</span></code> files and re-define the JVM-loaded classes</li>
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<li><a class="reference internal" href="jad.html"><span class="doc">jad</span></a> - de-compile the specified loaded classes</li>
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<li><a class="reference internal" href="classloader.html"><span class="doc">classloader</span></a> - check the inheritance structure, urls, class loading info of class cloader; using classloader to get the url of the resource e.g. <code class="docutils literal notranslate"><span class="pre">java/lang/String.class</span></code></li>
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</ul>
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</div>
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<div class="section" id="monitor-watch-trace-related">
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<span id="monitor-watch-trace-related"></span><h2>monitor/watch/trace - related<a class="headerlink" href="#monitor-watch-trace-related" title="Permalink to this headline">¶</a></h2>
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<blockquote>
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<div><strong>Attention</strong>: commands here are taking advantage of <code class="docutils literal notranslate"><span class="pre">byte</span> <span class="pre">code</span> <span class="pre">injection</span></code>, which means we are using <a class="reference external" href="https://en.wikipedia.org/wiki/Aspect-oriented_programming">AOP</a> to monitor and analyze the classes. So when using it for online troubleshooting, you’d better <em>explicitly specifically</em> specify the classes and also remember to remove the injected code by <code class="docutils literal notranslate"><span class="pre">shutdown</span></code> or <code class="docutils literal notranslate"><span class="pre">reset</span></code>.</div></blockquote>
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<ul class="simple">
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<li><a class="reference internal" href="monitor.html"><span class="doc">monitor</span></a> - monitor the <code class="docutils literal notranslate"><span class="pre">class-pattern</span></code> & <code class="docutils literal notranslate"><span class="pre">method-pattern</span></code> matched methods’ invoking traces</li>
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<li><a class="reference internal" href="watch.html"><span class="doc">watch</span></a> - watch/monitor methods in data aspect including <code class="docutils literal notranslate"><span class="pre">return</span> <span class="pre">values</span></code>, <code class="docutils literal notranslate"><span class="pre">exceptions</span></code> and <code class="docutils literal notranslate"><span class="pre">parameters</span></code></li>
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<li><a class="reference internal" href="trace.html"><span class="doc">trace</span></a> - track the method calling trace along with the time cost for each call</li>
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<li><a class="reference internal" href="stack.html"><span class="doc">stack</span></a> - print the call stack trace of the current method in a persistent way</li>
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<li><a class="reference internal" href="tt.html"><span class="doc">tt</span></a> - record the arguments and returned value for the methods, history included</li>
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</div>
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<div class="section" id="options">
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<span id="options"></span><h2>options<a class="headerlink" href="#options" title="Permalink to this headline">¶</a></h2>
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<ul class="simple">
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<li><a class="reference internal" href="options.html"><span class="doc">options</span></a> - check or set Arthas global options</li>
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</ul>
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</div>
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<div class="section" id="pipe">
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<span id="pipe"></span><h2>pipe<a class="headerlink" href="#pipe" title="Permalink to this headline">¶</a></h2>
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<p><code class="docutils literal notranslate"><span class="pre">pipe</span></code> is supported in Arthas, e.g. <code class="docutils literal notranslate"><span class="pre">sm</span> <span class="pre">org.apache.log4j.Logger</span> <span class="pre">|</span> <span class="pre">grep</span> <span class="pre"><init></span></code></p>
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<p>Commands supported in <code class="docutils literal notranslate"><span class="pre">pipe</span></code>:</p>
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<ul class="simple">
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<li>grep - filtering</li>
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<li>plaintext - remove the color</li>
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<li>wc - line counting</li>
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</ul>
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</div>
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<div class="section" id="async-in-background">
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<span id="async-in-background"></span><h2>async in background<a class="headerlink" href="#async-in-background" title="Permalink to this headline">¶</a></h2>
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<p><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/async.md">async</a> will be a great help, when the <code class="docutils literal notranslate"><span class="pre">incident</span></code> seldom occurs and you are <a class="reference external" href="watch.md"><code class="docutils literal notranslate"><span class="pre">watch</span></code></a>ing it.</p>
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<ul class="simple">
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<li>jobs - list all jobs</li>
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<li>kill - forcibly terminate the job</li>
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<li>fg - bring the paused job back to the front</li>
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<li>bg - put the paused job to the background</li>
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<li>tips - a) use <code class="docutils literal notranslate"><span class="pre">></span></code> to redirect the output; b) use <code class="docutils literal notranslate"><span class="pre">&</span></code> to put the job to the background; c) disconnecting the session will not influence the job (the default life is 1 day)</li>
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</ul>
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</div>
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<div class="section" id="others">
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<span id="others"></span><h2>Others<a class="headerlink" href="#others" title="Permalink to this headline">¶</a></h2>
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<ul class="simple">
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<li><a class="reference internal" href="web-console.html"><span class="doc">Web Console</span></a> - using websocket to connect Arthas</li>
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<li><a class="reference internal" href="save-log.html"><span class="doc">log the output</span></a></li>
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<li><a class="reference internal" href="batch-support.html"><span class="doc">batch</span></a></li>
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<li><a class="reference external" href="https://github.com/alibaba/arthas/issues/11">how to use ognl</a></li>
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</ul>
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