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classloader
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===
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> 查看classloader的继承树，urls，类加载信息
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`classloader` 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。
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可以让指定的classloader去getResources，打印出所有查找到的resources的url。对于`ResourceNotFoundException`比较有用。
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### 参数说明
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|参数名称|参数说明|
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|---:|:---|
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|[l]|按类加载实例进行统计|
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|[t]|打印所有ClassLoader的继承树|
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|[a]|列出所有ClassLoader加载的类，请谨慎使用|
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|`[c:]`|ClassLoader的hashcode|
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|`[c: r:]`|用ClassLoader去查找resource|
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### 使用参考
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* 按类加载类型查看统计信息
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```s
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$ classloader
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name numberOfInstances loadedCountTotal
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com.taobao.pandora.service.loader.ModuleClassLoader 29 11659
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com.taobao.pandora.boot.loader.ReLaunchURLClassLoader 1 5308
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BootstrapClassLoader 1 3711
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com.taobao.arthas.agent.ArthasClassloader 2 2825
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sun.reflect.DelegatingClassLoader 332 332
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java.net.URLClassLoader 1 285
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sun.misc.Launcher$AppClassLoader 1 77
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sun.misc.Launcher$ExtClassLoader 1 46
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com.alibaba.fastjson.util.ASMClassLoader 2 3
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org.jvnet.hk2.internal.DelegatingClassLoader 2 2
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sun.reflect.misc.MethodUtil 1 1
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Affect(row-cnt:11) cost in 66 ms.
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```
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* 按类加载实例查看统计信息
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```sh
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$ 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
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notify-tr-client's ModuleClassLoader 472 fba92d3 null
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ons-sdk's ModuleClassLoader 70 23348b5d null
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tair-plugin's ModuleClassLoader 1053 7c9d8e2 null
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tddl-client's ModuleClassLoader 2354 4988d8b8 null
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config-client's ModuleClassLoader 93 429bffaa null
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diamond-client's ModuleClassLoader 360 3d5c822d null
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pandolet's ModuleClassLoader 99 41e1e210 null
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hsf's ModuleClassLoader 1796 3232a28a null
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acl.plugin's ModuleClassLoader 379 67080771 null
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buc.sso.client.plugin's ModuleClassLoader 195 13b6aecc null
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unitrouter's ModuleClassLoader 64 7e5afaa6 null
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switch's ModuleClassLoader 104 24313fcc null
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hsf-notify-client's ModuleClassLoader 57 4d0f2471 null
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java.net.URLClassLoader@7ec7ffd3 285 7ec7ffd3 sun.misc.Launcher$ExtClassLoader@a38d7a3
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javax.management.remote.rmi.NoCallStackClassLoader@53f65459 1 53f65459 null
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javax.management.remote.rmi.NoCallStackClassLoader@2833cc44 1 2833cc44 null
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org.jvnet.hk2.internal.DelegatingClassLoader@72cda8ee 1 72cda8ee monitor's ModuleClassLoader
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org.jvnet.hk2.internal.DelegatingClassLoader@1f57f96d 1 1f57f96d monitor's ModuleClassLoader
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sun.misc.Launcher$AppClassLoader@14dad5dc 77 14dad5dc sun.misc.Launcher$ExtClassLoader@a38d7a3
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sun.misc.Launcher$ExtClassLoader@a38d7a3 46 a38d7a3 null
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sun.reflect.misc.MethodUtil@1201f221 1 1201f221 sun.misc.Launcher$AppClassLoader@14dad5dc
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```
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* 查看ClassLoader的继承树
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```shell
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$ classloader -t
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+-BootstrapClassLoader
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+-unitrouter's ModuleClassLoader
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+-diamond-client's ModuleClassLoader
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+-sun.misc.Launcher$ExtClassLoader@548a102f
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| +-sun.misc.Launcher$AppClassLoader@14dad5dc
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| +-com.taobao.arthas.agent.AgentLauncher$1@334e6bb8
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| | +-sun.reflect.DelegatingClassLoader@328b3a05
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```
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* 查看URLClassLoader实际的urls
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```shell
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$ classloader -c 5ffe9775
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file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/commons-lang-2.6.jar
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file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/log4j-1.2.16.jar
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file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/logger.api-0.1.4.jar
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file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/pandora.api-2.0.7-SNAPSHOT.jar
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file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/pandora.container-2.0.7-SNAPSHOT.jar
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file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/pandora.thirdcontainer-2.0.7-SNAPSHOT.jar
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file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/picocontainer-2.14.3.jar
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```
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* 使用ClassLoader去查找resource
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```shell
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$ classloader -c 226b143b -r META-INF/MANIFEST.MF
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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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```
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也可以尝试查找类的class文件：
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```shell
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$ 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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```
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