<!DOCTYPE html>
<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>jad — Arthas 3.0.5-SNAPSHOT documentation</title>
<link rel="shortcut icon" href="_static/favicon.ico"/>
<link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
<link rel="stylesheet" href="_static/pygments.css" type="text/css" />
<link rel="stylesheet" href="_static/overrides.css" type="text/css" />
<link rel="index" title="Index" href="genindex.html" />
<link rel="search" title="Search" href="search.html" />
<link rel="next" title="classloader" href="classloader.html" />
<link rel="prev" title="dump" href="dump.html" />
<script src="_static/center_page.js"></script>
<script src="_static/js/modernizr.min.js"></script>
</head>
<body class="wy-body-for-nav">
<div class="wy-grid-for-nav">
<nav data-toggle="wy-nav-shift" class="wy-nav-side">
<div class="wy-side-scroll">
<div class="wy-side-nav-search">
<a href="index.html" class="icon icon-home"> Arthas
</a>
<div class="version">
3.0.5-SNAPSHOT
</div>
<div role="search">
<form id="rtd-search-form" class="wy-form" action="search.html" method="get">
<input type="text" name="q" placeholder="Search docs" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
</div>
<div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="main navigation">
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="install-detail.html">Installation</a></li>
<li class="toctree-l1"><a class="reference internal" href="quick-start.html">Quick start</a></li>
<li class="toctree-l1"><a class="reference internal" href="advanced-use.html">Advanced usage</a></li>
<li class="toctree-l1 current"><a class="reference internal" href="commands.html">Commands</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="dashboard.html">dashboard</a></li>
<li class="toctree-l2"><a class="reference internal" href="thread.html">thread</a></li>
<li class="toctree-l2"><a class="reference internal" href="jvm.html">jvm</a></li>
<li class="toctree-l2"><a class="reference internal" href="sysprop.html">sysprop</a></li>
<li class="toctree-l2"><a class="reference internal" href="getstatic.html">getstatic</a></li>
<li class="toctree-l2"><a class="reference internal" href="sc.html">sc</a></li>
<li class="toctree-l2"><a class="reference internal" href="sm.html">sm</a></li>
<li class="toctree-l2"><a class="reference internal" href="dump.html">dump</a></li>
<li class="toctree-l2 current"><a class="current reference internal" href="#">jad</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#options">Options</a></li>
<li class="toctree-l3"><a class="reference internal" href="#usage">Usage</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="classloader.html">classloader</a></li>
<li class="toctree-l2"><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/redefine.md">redefine</a></li>
<li class="toctree-l2"><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/monitor.md">monitor</a></li>
<li class="toctree-l2"><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/watch.md">watch</a></li>
<li class="toctree-l2"><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/trace.md">trace</a></li>
<li class="toctree-l2"><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/stack.md">stack</a></li>
<li class="toctree-l2"><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/tt.md">tt</a></li>
<li class="toctree-l2"><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/options.md">options</a></li>
<li class="toctree-l2"><a class="reference internal" href="commands.html#arthas-basic-commands">Arthas Basic Commands</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues?q=label%3Auser-case">User cases</a></li>
<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/release-notes.md">Release Notes</a></li>
<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues?q=label%3Aquestion-answered">Questions and answers</a></li>
<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas">Fork me at GitHub</a></li>
<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/blob/master/CONTRIBUTING.md">CONTRIBUTING</a></li>
</ul>
</div>
</div>
</nav>
<section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
<nav class="wy-nav-top" aria-label="top navigation">
<i data-toggle="wy-nav-top" class="fa fa-bars"></i>
<a href="index.html">Arthas</a>
</nav>
<div class="wy-nav-content">
<div class="rst-content">
<div role="navigation" aria-label="breadcrumbs navigation">
<ul class="wy-breadcrumbs">
<li><a href="index.html">Docs</a> »</li>
<li><a href="commands.html">Commands List</a> »</li>
<li>jad</li>
<li class="wy-breadcrumbs-aside">
<a href="https://github.com/alibaba/arthas/blob/master/site/src/site/sphinx/jad.md" class="fa fa-github"> Edit on GitHub</a>
</li>
</ul>
<hr/>
</div>
<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
<div itemprop="articleBody">
<div class="section" id="jad">
<span id="jad"></span><h1>jad<a class="headerlink" href="#jad" title="Permalink to this headline">¶</a></h1>
<p>De-compile specified loaded classes.</p>
<p><code class="docutils literal notranslate"><span class="pre">jad</span></code> helps to <em>de-compile</em> the byte code in JVM to the source code to assist you to better understand the logic behind.</p>
<p>F.Y.I</p>
<ul class="simple">
<li>the de-compiled code will be grammatically highlighted for readability in Arthas Console;</li>
<li>you have to understand there might be some trivial grammar errors but it won’t affect the logic understanding.</li>
</ul>
<div class="section" id="options">
<span id="options"></span><h2>Options<a class="headerlink" href="#options" title="Permalink to this headline">¶</a></h2>
<table border="1" class="docutils">
<thead>
<tr>
<th align="right">Name</th>
<th align="left">Specification</th>
</tr>
</thead>
<tbody>
<tr>
<td align="right"><em>class-pattern</em></td>
<td align="left">pattern for the class name</td>
</tr>
<tr>
<td align="right"><code>[c:]</code></td>
<td align="left">hashcode of the class loader that loaded the class</td>
</tr>
<tr>
<td align="right">[E]</td>
<td align="left">turn on regx matching while the default is wildcards matching</td>
</tr>
</tbody>
</table></div>
<div class="section" id="usage">
<span id="usage"></span><h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
<p>When several class loaders loaded the same class:</p>
<ol class="simple">
<li><code class="docutils literal notranslate"><span class="pre">jad</span></code> to get the hashcode of the class loader;</li>
<li><code class="docutils literal notranslate"><span class="pre">jad</span> <span class="pre">-c</span> <span class="pre"><hashcode></span></code> to get the de-compiled class loaded by the class loader.</li>
</ol>
<div class="highlight-java notranslate"><div class="highlight"><pre><span></span>$ jad org.apache.log4j.Logger
Found more than one class for: org.apache.log4j.Logger, Please use jad -c hashcode org.apache.log4j.Logger
HASHCODE CLASSLOADER
69dcaba4 +-monitor's ModuleClassLoader
6e51ad67 +-java.net.URLClassLoader@6e51ad67
+-sun.misc.Launcher$AppClassLoader@6951a712
+-sun.misc.Launcher$ExtClassLoader@6fafc4c2
2bdd9114 +-pandora-qos-service's ModuleClassLoader
4c0df5f8 +-pandora-framework's ModuleClassLoader
Affect(row-cnt:0) cost in 38 ms.
$ jad org.apache.log4j.Logger -c 69dcaba4
ClassLoader:
+-monitor's ModuleClassLoader
Location:
/Users/zhuyong/Downloads/taobao-hsf.sar/plugins/monitor/lib/log4j-1.2.14.jar
package org.apache.log4j;
import org.apache.log4j.spi.*;
public class Logger extends Category
{
private static final String FQCN;
protected Logger(String name)
{
super(name);
}
public static Logger getLogger(String name)
{
return LogManager.getLogger(name);
}
public static Logger getLogger(Class clazz)
{
return LogManager.getLogger(clazz.getName());
}
public static Logger getRootLogger()
{
return LogManager.getRootLogger();
}
public static Logger getLogger(String name, LoggerFactory factory)
{
return LogManager.getLogger(name, factory);
}
public void trace(Object message)
{
if (repository.isDisabled(5000))
{
return;
}
if (Level.TRACE.isGreaterOrEqual(getEffectiveLevel()))
{
forcedLog(Logger.FQCN, Level.TRACE, message, null);
}
}
public void trace(Object message, Throwable t)
{
if (repository.isDisabled(5000))
{
return;
}
if (Level.TRACE.isGreaterOrEqual(getEffectiveLevel()))
{
forcedLog(Logger.FQCN, Level.TRACE, message, t);
}
}
public boolean isTraceEnabled()
{
if (repository.isDisabled(5000))
{
return false;
}
return Level.TRACE.isGreaterOrEqual(getEffectiveLevel());
}
static
{
Logger.FQCN = Logger.class.getName();
}
}
Affect(row-cnt:1) cost in 190 ms.
</pre></div>
</div>
<p>De-compile the specified method:</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>$ jad com.taobao.container.web.arthas.rest.MetricsController directMetrics
ClassLoader:
+-com.taobao.pandora.boot.loader.ReLaunchURLClassLoader@1817d444
+-sun.misc.Launcher<span class="nv">$AppClassLoader</span>@14dad5dc
+-sun.misc.Launcher<span class="nv">$ExtClassLoader</span>@a38d7a3
Location:
/Users/zhuyong/middleware/tomcat-web/tomcat-web-web/target/classes/
private Map<String, Object> directMetrics<span class="o">(</span>String ip, String<span class="o">[]</span> metrics<span class="o">)</span> <span class="o">{</span>
JSONObject obj<span class="p">;</span>
HashMap<String, Object> <span class="nv">result</span> <span class="o">=</span> new HashMap<String, Object><span class="o">()</span><span class="p">;</span>
result.put<span class="o">(</span><span class="s2">"success"</span>, <span class="nb">false</span><span class="o">)</span><span class="p">;</span>
String <span class="nv">metricUrl</span> <span class="o">=</span> <span class="s2">"http://"</span> + ip + <span class="s2">":8006/metrics/specific"</span><span class="p">;</span>
String <span class="nv">postBody</span> <span class="o">=</span> Arrays.stream<span class="o">(</span>metrics<span class="o">)</span>.map<span class="o">(</span>metric -> <span class="s2">"metric="</span> + metric<span class="o">)</span>.collect<span class="o">(</span>Collectors.joining<span class="o">(</span><span class="s2">"&"</span><span class="o">))</span><span class="p">;</span>
HttpClientUtils.Response <span class="nv">resp</span> <span class="o">=</span> HttpClientUtils.sendPostRequest<span class="o">((</span>String<span class="o">)</span>metricUrl, <span class="o">(</span>String<span class="o">)</span>postBody<span class="o">)</span><span class="p">;</span>
<span class="k">if</span> <span class="o">(</span>resp.isSuccess<span class="o">()</span> <span class="o">&&</span> <span class="o">(</span><span class="nv">obj</span> <span class="o">=</span> JSON.parseObject<span class="o">(</span>resp.getContent<span class="o">()))</span>.containsKey<span class="o">(</span><span class="s2">"success"</span><span class="o">)</span> <span class="o">&&</span> obj.getBoolean<span class="o">(</span><span class="s2">"success"</span><span class="o">)</span>.booleanValue<span class="o">()</span> <span class="o">&&</span> obj.containsKey<span class="o">(</span><span class="s2">"data"</span><span class="o">))</span> <span class="o">{</span>
JSONArray <span class="nv">dataArray</span> <span class="o">=</span> obj.getJSONArray<span class="o">(</span><span class="s2">"data"</span><span class="o">)</span><span class="p">;</span>
HashMap<String, Object> <span class="nv">metricMap</span> <span class="o">=</span> new HashMap<String, Object><span class="o">()</span><span class="p">;</span>
<span class="k">for</span> <span class="o">(</span>Object aDataArray : dataArray<span class="o">)</span> <span class="o">{</span>
JSONObject <span class="nv">o</span> <span class="o">=</span> <span class="o">(</span>JSONObject<span class="o">)</span>aDataArray<span class="p">;</span>
metricMap.put<span class="o">(</span>o.getString<span class="o">(</span><span class="s2">"metric"</span><span class="o">)</span>, o.get<span class="o">(</span><span class="s2">"value"</span><span class="o">))</span><span class="p">;</span>
<span class="o">}</span>
result.put<span class="o">(</span><span class="s2">"data"</span>, metricMap<span class="o">)</span><span class="p">;</span>
result.put<span class="o">(</span><span class="s2">"success"</span>, <span class="nb">true</span><span class="o">)</span><span class="p">;</span>
<span class="k">return</span> result<span class="p">;</span>
<span class="o">}</span>
<span class="k">return</span> result<span class="p">;</span>
<span class="o">}</span>
Affect<span class="o">(</span>row-cnt:1<span class="o">)</span> cost in <span class="m">1508</span> ms.
</pre></div>
</div>
</div>
</div>
</div>
</div>
<footer>
<div class="rst-footer-buttons" role="navigation" aria-label="footer navigation">
<a href="classloader.html" class="btn btn-neutral float-right" title="classloader" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right"></span></a>
<a href="dump.html" class="btn btn-neutral" title="dump" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left"></span> Previous</a>
</div>
<hr/>
<div role="contentinfo">
<p>
© Copyright 2018, Alibaba Middleware Group, and contributors.
</p>
</div>
Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/rtfd/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>.
</footer>
</div>
</div>
</section>
</div>
<script type="text/javascript">
var DOCUMENTATION_OPTIONS = {
URL_ROOT:'./',
VERSION:'3.0.5-SNAPSHOT',
LANGUAGE:'None',
COLLAPSE_INDEX:false,
FILE_SUFFIX:'.html',
HAS_SOURCE: true,
SOURCELINK_SUFFIX: '.txt'
};
</script>
<script type="text/javascript" src="_static/jquery.js"></script>
<script type="text/javascript" src="_static/underscore.js"></script>
<script type="text/javascript" src="_static/doctools.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
<script type="text/javascript" src="_static/js/theme.js"></script>
<script type="text/javascript">
jQuery(function () {
SphinxRtdTheme.Navigation.enable(true);
});
</script>
<div class="github-fork-ribbon-wrapper right">
<div class="github-fork-ribbon">
<a href="https://github.com/alibaba/arthas">Fork me at GitHub</a>
</div>
</div>
<script type="text/javascript" src="_static/add_badges.js"></script>
<script>
var _hmt = _hmt || [];
(function() {
var hm = document.createElement("script");
hm.src = "https://hm.baidu.com/hm.js?d5c5e25b100f0eb51a4c35c8a86ea9b4";
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(hm, s);
})();
</script>
</body>
</html>