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<div class="section" id="classloader">
<span id="classloader"></span><h1>classloader<a class="headerlink" href="#classloader" title="永久链接至标题">¶</a></h1>
<blockquote>
<div>查看classloader的继承树，urls，类加载信息</div></blockquote>
<p><code class="docutils literal notranslate"><span class="pre">classloader</span></code> 命令将 JVM 中所有的classloader的信息统计出来，并可以展示继承树，urls等。</p>
<p>可以让指定的classloader去getResources，打印出所有查找到的resources的url。对于<code class="docutils literal notranslate"><span class="pre">ResourceNotFoundException</span></code>比较有用。</p>
<div class="section" id="">
<span id="id1"></span><h2>参数说明<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
<table border="1" class="docutils">
<thead>
<tr>
<th align="right">参数名称</th>
<th align="left">参数说明</th>
</tr>
</thead>
<tbody>
<tr>
<td align="right">[l]</td>
<td align="left">按类加载实例进行统计</td>
</tr>
<tr>
<td align="right">[t]</td>
<td align="left">打印所有ClassLoader的继承树</td>
</tr>
<tr>
<td align="right">[a]</td>
<td align="left">列出所有ClassLoader加载的类，请谨慎使用</td>
</tr>
<tr>
<td align="right"><code>[c:]</code></td>
<td align="left">ClassLoader的hashcode</td>
</tr>
<tr>
<td align="right"><code>[c: r:]</code></td>
<td align="left">用ClassLoader去查找resource</td>
</tr>
<tr>
<td align="right">### 使用参考</td>
<td align="left"></td>
</tr>
</tbody>
</table><ul class="simple">
<li>按类加载类型查看统计信息</li>
</ul>
<div class="highlight-s notranslate"><div class="highlight"><pre><span></span><span class="o">$</span> classloader
name numberOfInstances loadedCountTotal
com.taobao.pandora.service.loader.ModuleClassLoader <span class="m">29</span> <span class="m">11659</span>
com.taobao.pandora.boot.loader.ReLaunchURLClassLoader <span class="m">1</span> <span class="m">5308</span>
BootstrapClassLoader <span class="m">1</span> <span class="m">3711</span>
com.taobao.arthas.agent.ArthasClassloader <span class="m">2</span> <span class="m">2825</span>
sun.reflect.DelegatingClassLoader <span class="m">332</span> <span class="m">332</span>
java.net.URLClassLoader <span class="m">1</span> <span class="m">285</span>
sun.misc.Launcher<span class="o">$</span>AppClassLoader <span class="m">1</span> <span class="m">77</span>
sun.misc.Launcher<span class="o">$</span>ExtClassLoader <span class="m">1</span> <span class="m">46</span>
com.alibaba.fastjson.util.ASMClassLoader <span class="m">2</span> <span class="m">3</span>
org.jvnet.hk2.internal.DelegatingClassLoader <span class="m">2</span> <span class="m">2</span>
sun.reflect.misc.MethodUtil <span class="m">1</span> <span class="m">1</span>
Affect<span class="p">(</span><span class="kp">row</span><span class="o">-</span>cnt<span class="o">:</span><span class="m">11</span><span class="p">)</span> cost <span class="kr">in</span> <span class="m">66</span> ms.
</pre></div>
</div>
<ul class="simple">
<li>按类加载实例查看统计信息</li>
</ul>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>$ classloader -l
name loadedCount hash parent
BootstrapClassLoader 3711 null null
com.alibaba.fastjson.util.ASMClassLoader@3bbaa1b8 2 3bbaa1b8 monitor's ModuleClassLoader
com.alibaba.fastjson.util.ASMClassLoader@5e255d0b 1 5e255d0b eagleeye-core's ModuleClassLoader
com.taobao.arthas.agent.ArthasClassloader@4fa2d7e6 1795 4fa2d7e6 sun.misc.Launcher$ExtClassLoader@a38d7a3
com.taobao.arthas.agent.ArthasClassloader@522400c2 1033 522400c2 sun.misc.Launcher$ExtClassLoader@a38d7a3
com.taobao.pandora.boot.loader.ReLaunchURLClassLoader@1817d444 5308 1817d444 sun.misc.Launcher$AppClassLoader@14dad5dc
tbsession's ModuleClassLoader 285 609cd4d8 null
pandora-qos-service's ModuleClassLoader 267 2f8dad04 null
pandora-framework's ModuleClassLoader 78 4009e306 null
filesync-client's ModuleClassLoader 4 4b8ee4de null
rocketmq-client's ModuleClassLoader 431 247bddad null
eagleeye-core's ModuleClassLoader 451 1ba9117e null
alimonitor-jmonitor's ModuleClassLoader 134 22fcf7ab null
metaq-client's ModuleClassLoader 35 41a2befb null
hsf-mock's ModuleClassLoader 3 2002fc1d null
monitor's ModuleClassLoader 1427 131ef10 null
spas-sdk-service's ModuleClassLoader 7 10d307f1 null
vipserver-client's ModuleClassLoader 137 7a419da4 null
metrics's ModuleClassLoader 146 696da30b null
mtop-uncenter's ModuleClassLoader 922 79d8407f null
spas-sdk-client's ModuleClassLoader 235 4944252c null
live-profiler-pandora's ModuleClassLoader 1 6913c1fb null
notify-tr-client's ModuleClassLoader 472 fba92d3 null
ons-sdk's ModuleClassLoader 70 23348b5d null
tair-plugin's ModuleClassLoader 1053 7c9d8e2 null
tddl-client's ModuleClassLoader 2354 4988d8b8 null
config-client's ModuleClassLoader 93 429bffaa null
diamond-client's ModuleClassLoader 360 3d5c822d null
pandolet's ModuleClassLoader 99 41e1e210 null
hsf's ModuleClassLoader 1796 3232a28a null
acl.plugin's ModuleClassLoader 379 67080771 null
buc.sso.client.plugin's ModuleClassLoader 195 13b6aecc null
unitrouter's ModuleClassLoader 64 7e5afaa6 null
switch's ModuleClassLoader 104 24313fcc null
hsf-notify-client's ModuleClassLoader 57 4d0f2471 null
java.net.URLClassLoader@7ec7ffd3 285 7ec7ffd3 sun.misc.Launcher$ExtClassLoader@a38d7a3
javax.management.remote.rmi.NoCallStackClassLoader@53f65459 1 53f65459 null
javax.management.remote.rmi.NoCallStackClassLoader@2833cc44 1 2833cc44 null
org.jvnet.hk2.internal.DelegatingClassLoader@72cda8ee 1 72cda8ee monitor's ModuleClassLoader
org.jvnet.hk2.internal.DelegatingClassLoader@1f57f96d 1 1f57f96d monitor's ModuleClassLoader
sun.misc.Launcher$AppClassLoader@14dad5dc 77 14dad5dc sun.misc.Launcher$ExtClassLoader@a38d7a3
sun.misc.Launcher$ExtClassLoader@a38d7a3 46 a38d7a3 null
sun.reflect.misc.MethodUtil@1201f221 1 1201f221 sun.misc.Launcher$AppClassLoader@14dad5dc
</pre></div>
</div>
<ul class="simple">
<li>查看ClassLoader的继承树</li>
</ul>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ classloader -t
+-BootstrapClassLoader
+-unitrouter<span class="s1">'s ModuleClassLoader</span>
<span class="s1">+-diamond-client'</span>s ModuleClassLoader
+-sun.misc.Launcher<span class="nv">$ExtClassLoader</span>@548a102f
<span class="p">|</span> +-sun.misc.Launcher<span class="nv">$AppClassLoader</span>@14dad5dc
<span class="p">|</span> +-com.taobao.arthas.agent.AgentLauncher<span class="nv">$1</span>@334e6bb8
<span class="p">|</span> <span class="p">|</span> +-sun.reflect.DelegatingClassLoader@328b3a05
<span class="p">|</span> <span class="p">|</span> +-sun.reflect.DelegatingClassLoader@73f44f24
</pre></div>
</div>
<ul class="simple">
<li>查看URLClassLoader实际的urls</li>
</ul>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ classloader -c 5ffe9775
file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/commons-lang-2.6.jar
file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/log4j-1.2.16.jar
file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/logger.api-0.1.4.jar
file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/pandora.api-2.0.7-SNAPSHOT.jar
file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/pandora.container-2.0.7-SNAPSHOT.jar
file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/pandora.thirdcontainer-2.0.7-SNAPSHOT.jar
file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/picocontainer-2.14.3.jar
</pre></div>
</div>
<ul class="simple">
<li>使用ClassLoader去查找resource</li>
</ul>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ classloader -c 226b143b -r META-INF/MANIFEST.MF
jar:file:/Users/hello/.m2/repository/javax/enterprise/cdi-api/1.0/cdi-api-1.0.jar!/META-INF/MANIFEST.MF
jar:file:/Users/hello/.m2/repository/javax/annotation/jsr250-api/1.0/jsr250-api-1.0.jar!/META-INF/MANIFEST.MF
</pre></div>
</div>
<p>也可以尝试查找类的class文件：</p>
<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ classloader -c 1b6d3586 -r java/lang/String.class
jar:file:/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/rt.jar!/java/lang/String.class
</pre></div>
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