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< li class = "toctree-l3" > < a class = "reference internal" href = "#id1" > 参数说明< / a > < / li >
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< h1 > classloader< a class = "headerlink" href = "#classloader" title = "永久链接至标题" > ¶< / a > < / h1 >
< blockquote >
< div > < p > 查看classloader的继承树， ， < / p >
< / 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 = "id1" >
< h2 > 参数说明< a class = "headerlink" href = "#id1" 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" > < code > [c: load:]< / code > < / td >
< td align = "left" > 用ClassLoader去加载指定的类< / td >
< / tr >
< / tbody >
< / table > < / div >
< div class = "section" id = "id2" >
< h2 > 使用参考< a class = "headerlink" href = "#id2" title = "永久链接至标题" > ¶< / a > < / h2 >
< div class = "section" id = "id3" >
< h3 > 按类加载类型查看统计信息< a class = "headerlink" href = "#id3" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ classloader
name numberOfInstances loadedCountTotal
com.taobao.arthas.agent.ArthasClassloader 1 2115
BootstrapClassLoader 1 1861
sun.reflect.DelegatingClassLoader 5 5
sun.misc.Launcher$AppClassLoader 1 4
sun.misc.Launcher$ExtClassLoader 1 1
Affect(row-cnt:5) cost in 3 ms.< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "id4" >
< h3 > 按类加载实例查看统计信息< a class = "headerlink" href = "#id4" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ classloader -l
name loadedCount hash parent
BootstrapClassLoader 1861 null null
com.taobao.arthas.agent.ArthasClassloader@68b31f0a 2115 68b31f0a sun.misc.Launcher$ExtClassLoader@66350f69
sun.misc.Launcher$AppClassLoader@3d4eac69 4 3d4eac69 sun.misc.Launcher$ExtClassLoader@66350f69
sun.misc.Launcher$ExtClassLoader@66350f69 1 66350f69 null
Affect(row-cnt:4) cost in 2 ms.< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "id5" >
< h3 > 查看ClassLoader的继承树< a class = "headerlink" href = "#id5" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ classloader -t
+-BootstrapClassLoader
+-sun.misc.Launcher$ExtClassLoader@66350f69
+-com.taobao.arthas.agent.ArthasClassloader@68b31f0a
+-sun.misc.Launcher$AppClassLoader@3d4eac69
Affect(row-cnt:4) cost in 3 ms.< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "urlclassloaderurls" >
< h3 > 查看URLClassLoader实际的urls< a class = "headerlink" href = "#urlclassloaderurls" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ classloader -c 3d4eac69
file:/private/tmp/arthas-demo.jar
file:/Users/hengyunabc/.arthas/lib/3.0.5/arthas/arthas-agent.jar
Affect(row-cnt:9) cost in 3 ms.< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "classloaderresource" >
< h3 > 使用ClassLoader去查找resource< a class = "headerlink" href = "#classloaderresource" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ classloader -c 3d4eac69 -r META-INF/MANIFEST.MF
jar:file:/System/Library/Java/Extensions/MRJToolkit.jar!/META-INF/MANIFEST.MF
jar:file:/private/tmp/arthas-demo.jar!/META-INF/MANIFEST.MF
jar:file:/Users/hengyunabc/.arthas/lib/3.0.5/arthas/arthas-agent.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-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ 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 >
< / div >
< / div >
< div class = "section" id = "id6" >
< h3 > 使用ClassLoader去加载类< a class = "headerlink" href = "#id6" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ classloader -c 3d4eac69 --load demo.MathGame
load class success.
class-info demo.MathGame
code-source /private/tmp/arthas-demo.jar
name demo.MathGame
isInterface false
isAnnotation false
isEnum false
isAnonymousClass false
isArray false
isLocalClass false
isMemberClass false
isPrimitive false
isSynthetic false
simple-name MathGame
modifier public
annotation
interfaces
super-class +-java.lang.Object
class-loader +-sun.misc.Launcher$AppClassLoader@3d4eac69
+-sun.misc.Launcher$ExtClassLoader@66350f69
classLoaderHash 3d4eac69< / pre > < / div >
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