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3.1.1
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<li class="toctree-l3"><a class="reference external" href="https://github.com/alibaba/arthas/issues/11">how to use ognl</a></li>
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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 - display Arthas help</li>
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<li>cls - clear the screen</li>
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<li><a class="reference internal" href="cat.html"><span class="doc">cat</span></a> - Concatenate and print files</li>
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<li><a class="reference internal" href="pwd.html"><span class="doc">pwd</span></a> - Return working directory name</li>
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<li>session - display current session information</li>
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<li><a class="reference internal" href="reset.html"><span class="doc">reset</span></a> - reset all the enhanced classes. All enhanced classes will also be reset when Arthas server is closed by <tt class="docutils literal">shutdown</tt></li>
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<li>version - print the version for the Arthas attached to the current Java process</li>
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<li>history - view command history</li>
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<li>quit/exit - exit the current Arthas session, without effecting other sessions</li>
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<li>shutdown - terminate the Arthas server, all Arthas sessions will be destroyed</li>
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<li><a class="reference internal" href="keymap.html"><span class="doc">keymap</span></a> - keymap for Arthas keyboard shortcut</li>
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</ul>
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</div>
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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> - dashboard for the system’s real-time data</li>
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<li><a class="reference internal" href="thread.html"><span class="doc">thread</span></a> - show java thread information</li>
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<li><a class="reference internal" href="jvm.html"><span class="doc">jvm</span></a> - show JVM information</li>
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<li><a class="reference internal" href="sysprop.html"><span class="doc">sysprop</span></a> - view/modify system properties</li>
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<li><a class="reference internal" href="sysenv.html"><span class="doc">sysenv</span></a> — view system environment variables</li>
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<li><a class="reference internal" href="getstatic.html"><span class="doc">getstatic</span></a> - examine class’s static properties</li>
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<li><strong>New!</strong> <a class="reference internal" href="ognl.html"><span class="doc">ognl</span></a> - execute ongl expression</li>
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<li><strong>New!</strong> <a class="reference internal" href="mbean.html"><span class="doc">mbean</span></a> - show Mbean information</li>
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</ul>
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</div>
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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 the info for 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 info for the loaded classes</li>
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<li><a class="reference internal" href="jad.html"><span class="doc">jad</span></a> - decompile the specified loaded classes</li>
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<li><a class="reference internal" href="mc.html"><span class="doc">mc</span></a> - Memory compiler, compiles <tt class="docutils literal">.java</tt> files into <tt class="docutils literal">.class</tt> files in memory</li>
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<li><a class="reference internal" href="redefine.html"><span class="doc">redefine</span></a> - load external <tt class="docutils literal">*.class</tt> files and re-define it into JVM</li>
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<li><a class="reference internal" href="dump.html"><span class="doc">dump</span></a> - dump the loaded classes in byte code to the specified location</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 for the specified class; using classloader to get the url of the resource e.g. <tt class="docutils literal">java/lang/String.class</tt></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 byte-code-injection, which means we are injecting some <a class="reference external" href="https://en.wikipedia.org/wiki/Aspect-oriented_programming">aspects</a> into the current classes for monitoring and statistics purpose. Therefore when use it for online troubleshooting in your production environment, you’d better <strong>explicitly specify</strong> classes/methods/criteria, and remember to remove the injected code by <tt class="docutils literal">shutdown</tt> or <tt class="docutils literal">reset</tt>.</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 method execution statistics</li>
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<li><a class="reference internal" href="watch.html"><span class="doc">watch</span></a> - display the input/output parameter, return object, and thrown exception of specified method invocation</li>
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<li><a class="reference internal" href="trace.html"><span class="doc">trace</span></a> - trace the execution time of specified method invocation</li>
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<li><a class="reference internal" href="stack.html"><span class="doc">stack</span></a> - display the stack trace for the specified class and method</li>
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<li><a class="reference internal" href="tt.html"><span class="doc">tt</span></a> - time tunnel, record the arguments and returned value for the methods and replay</li>
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</ul>
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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/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>Arthas provides <tt class="docutils literal">pipe</tt> to process the result returned from commands further, e.g. <tt class="docutils literal">sm java.lang.String * | grep 'index'</tt>. Commands supported in <tt class="docutils literal">pipe</tt>:</p>
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<ul class="simple">
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<li>grep - filter the result with the given keyword</li>
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<li>plaintext - remove the ANSI color</li>
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<li>wc - count lines</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 internal" href="async.html"><span class="doc">async</span></a> can be handy when a problem is hardly to reproduce in the production environment, e.g. one <tt class="docutils literal">watch</tt> condition may happen only once in one single day.</p>
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<ul class="simple">
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<li>job control - use <tt class="docutils literal">></tt> to redirect result into the log file, use <tt class="docutils literal">&</tt> to put the job to the background. Job keeps running even if the session is disconnected (the session lifecycle is 1 day by default)</li>
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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 suspend job to the foreground</li>
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<li>bg - put the job to run in the background</li>
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</ul>
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</div>
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<div class="section" id="web-console">
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<span id="web-console"></span><h2>Web Console<a class="headerlink" href="#web-console" title="Permalink to this headline">¶</a></h2>
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<p>Arthas supports living inside a browser. The communication between arthas and browser is via websocket.</p>
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<div class="toctree-wrapper compound">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="web-console.html">Web Console</a></li>
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</ul>
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</div>
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</div>
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<div class="section" id="other-features">
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<span id="other-features"></span><h2>Other features<a class="headerlink" href="#other-features" title="Permalink to this headline">¶</a></h2>
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<div class="toctree-wrapper compound">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="async.html">Async support</a></li>
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<li class="toctree-l1"><a class="reference internal" href="save-log.html">log the output</a></li>
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<li class="toctree-l1"><a class="reference internal" href="batch-support.html">batch</a></li>
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<li class="toctree-l1"><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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</div>
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</div>
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</div>
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© Copyright 2018-2019, Alibaba Middleware Group, and contributors.
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