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<li class="toctree-l4"><a class="reference internal" href="#decompile-with-specified-classloader">Decompile with specified classLoader</a></li>
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<div class="section" id="jad">
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<span id="jad"></span><h1>jad<a class="headerlink" href="#jad" title="Permalink to this headline">¶</a></h1>
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<blockquote>
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<div>Decompile the specified classes.</div></blockquote>
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<p><tt class="docutils literal">jad</tt> helps to decompile the byte code running in JVM to the source code to assist you to understand the logic behind better.</p>
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<ul class="simple">
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<li>The decompiled code is syntax highlighted for better readability in Arthas console.</li>
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<li>It is possible that there’s grammar error in the decompiled code, but it should not affect your interpretation.</li>
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</ul>
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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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<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"><code>[c:]</code></td>
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<td align="left">hashcode of the class loader that loads the class</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 while the default is wildcard match</td>
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</tr>
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</tbody>
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</table></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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<div class="section" id="decompile-java-lang-string">
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<span id="decompile-java-lang-string"></span><h3>Decompile <tt class="docutils literal">java.lang.String</tt><a class="headerlink" href="#decompile-java-lang-string" title="Permalink to this headline">¶</a></h3>
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<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">$ jad java.lang.String
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ClassLoader:
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Location:
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/*
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* Decompiled with CFR 0_132.
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*/
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package java.lang;
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import java.io.ObjectStreamField;
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...
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public final class String
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implements Serializable,
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Comparable<String>,
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CharSequence {
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private final char[] value;
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private int hash;
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private static final long serialVersionUID = -6849794470754667710L;
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private static final ObjectStreamField[] serialPersistentFields = new ObjectStreamField[0];
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public static final Comparator<String> CASE_INSENSITIVE_ORDER = new CaseInsensitiveComparator();
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public String(byte[] arrby, int n, int n2) {
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String.checkBounds(arrby, n, n2);
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this.value = StringCoding.decode(arrby, n, n2);
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}
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...
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</pre></div>
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</div>
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</div>
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<div class="section" id="print-source-only">
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<span id="print-source-only"></span><h3>Print source only<a class="headerlink" href="#print-source-only" title="Permalink to this headline">¶</a></h3>
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<p>By default, the decompile result will have the <tt class="docutils literal">ClassLoader</tt> information. With the <tt class="docutils literal">--source-only</tt> option, you can print only the source code. Conveniently used with the <a class="reference internal" href="mc.html"><span class="doc">mc</span></a>/<a class="reference internal" href="redefine.html"><span class="doc">redefine</span></a> commands.</p>
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<div class="highlight-default notranslate"><pre class="literal-block">$ jad --source-only demo.MathGame
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/*
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* Decompiled with CFR 0_132.
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*/
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package demo;
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import java.io.PrintStream;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Random;
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import java.util.concurrent.TimeUnit;
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public class MathGame {
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private static Random random = new Random();
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public int illegalArgumentCount = 0;
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...</pre>
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</div>
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</div>
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<div class="section" id="decompile-the-specified-method">
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<span id="decompile-the-specified-method"></span><h3>Decompile the specified method<a class="headerlink" href="#decompile-the-specified-method" title="Permalink to this headline">¶</a></h3>
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<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">$ jad demo.MathGame main
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ClassLoader:
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+-sun.misc.Launcher$AppClassLoader@3d4eac69
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+-sun.misc.Launcher$ExtClassLoader@66350f69
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Location:
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/private/tmp/arthas-demo.jar
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public static void main(String[] args) throws InterruptedException {
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MathGame game = new MathGame();
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do {
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game.run();
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TimeUnit.SECONDS.sleep(1L);
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} while (true);
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}
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Affect(row-cnt:1) cost in 228 ms.
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</pre></div>
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</div>
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</div>
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<div class="section" id="decompile-with-specified-classloader">
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<span id="decompile-with-specified-classloader"></span><h3>Decompile with specified classLoader<a class="headerlink" href="#decompile-with-specified-classloader" title="Permalink to this headline">¶</a></h3>
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<blockquote>
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<div>If the target class is loaded by multiple classloaders, <tt class="docutils literal">jad</tt> outputs the <tt class="docutils literal">hashcode</tt> of the corresponding classloaders, then you can re-run <tt class="docutils literal">jad</tt> and specify <tt class="docutils literal">-c <hashcode></tt> to decompile the target class from the specified classloader.</div></blockquote>
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<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">$ jad org.apache.log4j.Logger
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Found more than one class for: org.apache.log4j.Logger, Please use jad -c hashcode org.apache.log4j.Logger
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HASHCODE CLASSLOADER
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69dcaba4 +-monitor's ModuleClassLoader
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6e51ad67 +-java.net.URLClassLoader@6e51ad67
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+-sun.misc.Launcher$AppClassLoader@6951a712
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+-sun.misc.Launcher$ExtClassLoader@6fafc4c2
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2bdd9114 +-pandora-qos-service's ModuleClassLoader
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4c0df5f8 +-pandora-framework's ModuleClassLoader
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Affect(row-cnt:0) cost in 38 ms.
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$ jad org.apache.log4j.Logger -c 69dcaba4
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ClassLoader:
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+-monitor's ModuleClassLoader
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Location:
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/Users/admin/app/log4j-1.2.14.jar
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package org.apache.log4j;
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import org.apache.log4j.spi.*;
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public class Logger extends Category
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{
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private static final String FQCN;
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protected Logger(String name)
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{
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super(name);
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}
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...
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Affect(row-cnt:1) cost in 190 ms.
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</pre></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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