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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 >
< blockquote >
< div > 查看classloader的继承树， ， < / 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， ， < / p >
< p > 可以让指定的classloader去getResources， < 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， < / 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
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