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<div class="section" id="classloader">
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<span id="classloader"></span><h1>classloader<a class="headerlink" href="#classloader" title="永久链接至标题">¶</a></h1>
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<blockquote>
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<div>查看classloader的继承树，urls，类加载信息</div></blockquote>
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<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>
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<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>
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<div class="section" id="">
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<span id="id1"></span><h2>参数说明<a class="headerlink" href="#" title="永久链接至标题">¶</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">参数名称</th>
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<th align="left">参数说明</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">[l]</td>
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<td align="left">按类加载实例进行统计</td>
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</tr>
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<tr>
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<td align="right">[t]</td>
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<td align="left">打印所有ClassLoader的继承树</td>
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</tr>
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<tr>
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<td align="right">[a]</td>
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<td align="left">列出所有ClassLoader加载的类，请谨慎使用</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">ClassLoader的hashcode</td>
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</tr>
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<tr>
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<td align="right"><code>[c: r:]</code></td>
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<td align="left">用ClassLoader去查找resource</td>
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</tr>
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<tr>
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<td align="right">### 使用参考</td>
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<td align="left"></td>
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</tr>
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</tbody>
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</table><ul class="simple">
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<li>按类加载类型查看统计信息</li>
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</ul>
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<div class="highlight-s notranslate"><div class="highlight"><pre><span></span><span class="o">$</span> classloader
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name numberOfInstances loadedCountTotal
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com.taobao.pandora.service.loader.ModuleClassLoader <span class="m">29</span> <span class="m">11659</span>
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com.taobao.pandora.boot.loader.ReLaunchURLClassLoader <span class="m">1</span> <span class="m">5308</span>
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BootstrapClassLoader <span class="m">1</span> <span class="m">3711</span>
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com.taobao.arthas.agent.ArthasClassloader <span class="m">2</span> <span class="m">2825</span>
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sun.reflect.DelegatingClassLoader <span class="m">332</span> <span class="m">332</span>
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java.net.URLClassLoader <span class="m">1</span> <span class="m">285</span>
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sun.misc.Launcher<span class="o">$</span>AppClassLoader <span class="m">1</span> <span class="m">77</span>
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sun.misc.Launcher<span class="o">$</span>ExtClassLoader <span class="m">1</span> <span class="m">46</span>
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com.alibaba.fastjson.util.ASMClassLoader <span class="m">2</span> <span class="m">3</span>
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org.jvnet.hk2.internal.DelegatingClassLoader <span class="m">2</span> <span class="m">2</span>
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sun.reflect.misc.MethodUtil <span class="m">1</span> <span class="m">1</span>
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Affect<span class="p">(</span><span class="kp">row</span><span class="o">-</span>cnt<span class="o">:</span><span class="m">11</span><span class="p">)</span> cost <span class="kr">in</span> <span class="m">66</span> ms.
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</pre></div>
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</div>
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<ul class="simple">
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<li>按类加载实例查看统计信息</li>
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</ul>
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<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>$ classloader -l
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name loadedCount hash parent
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BootstrapClassLoader 3711 null null
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com.alibaba.fastjson.util.ASMClassLoader@3bbaa1b8 2 3bbaa1b8 monitor's ModuleClassLoader
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com.alibaba.fastjson.util.ASMClassLoader@5e255d0b 1 5e255d0b eagleeye-core's ModuleClassLoader
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com.taobao.arthas.agent.ArthasClassloader@4fa2d7e6 1795 4fa2d7e6 sun.misc.Launcher$ExtClassLoader@a38d7a3
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com.taobao.arthas.agent.ArthasClassloader@522400c2 1033 522400c2 sun.misc.Launcher$ExtClassLoader@a38d7a3
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com.taobao.pandora.boot.loader.ReLaunchURLClassLoader@1817d444 5308 1817d444 sun.misc.Launcher$AppClassLoader@14dad5dc
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tbsession's ModuleClassLoader 285 609cd4d8 null
|
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pandora-qos-service's ModuleClassLoader 267 2f8dad04 null
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pandora-framework's ModuleClassLoader 78 4009e306 null
|
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filesync-client's ModuleClassLoader 4 4b8ee4de null
|
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rocketmq-client's ModuleClassLoader 431 247bddad null
|
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eagleeye-core's ModuleClassLoader 451 1ba9117e null
|
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alimonitor-jmonitor's ModuleClassLoader 134 22fcf7ab null
|
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metaq-client's ModuleClassLoader 35 41a2befb null
|
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hsf-mock's ModuleClassLoader 3 2002fc1d null
|
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monitor's ModuleClassLoader 1427 131ef10 null
|
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|
spas-sdk-service's ModuleClassLoader 7 10d307f1 null
|
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|
vipserver-client's ModuleClassLoader 137 7a419da4 null
|
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metrics's ModuleClassLoader 146 696da30b null
|
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mtop-uncenter's ModuleClassLoader 922 79d8407f null
|
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spas-sdk-client's ModuleClassLoader 235 4944252c null
|
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|
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
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jar:file:/Users/hello/.m2/repository/javax/annotation/jsr250-api/1.0/jsr250-api-1.0.jar!/META-INF/MANIFEST.MF
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</pre></div>
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<p>也可以尝试查找类的class文件：</p>
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<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ classloader -c 1b6d3586 -r java/lang/String.class
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jar:file:/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/rt.jar!/java/lang/String.class
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