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< div class = "section" id = "classloader" >
< h1 > classloader< a class = "headerlink" href = "#classloader" title = "Permalink to this headline" > ¶< / a > < / h1 >
< p > View hierarchy, urls and classes-loading info for the class-loaders.< / p >
< p > < code class = "docutils literal notranslate" > < span class = "pre" > classloader< / span > < / code > can search and print out the URLs for a specified resource from one particular classloader. It is quite handy when analyze < code class = "docutils literal notranslate" > < span class = "pre" > ResourceNotFoundException< / span > < / code > .< / p >
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< th align = "right" > Name< / th >
< th align = "left" > Specification< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td align = "right" > [l]< / td >
< td align = "left" > list all classloader instances< / td >
< / tr >
< tr >
< td align = "right" > [t]< / td >
< td align = "left" > print classloader's hierarchy< / td >
< / tr >
< tr >
< td align = "right" > [a]< / td >
< td align = "left" > list all the classes loaded by all the classloaders (use it with great caution since the output can be huge)< / td >
< / tr >
< tr >
< td align = "right" > [c:]< / td >
< td align = "left" > print classloader's hashcode< / td >
< / tr >
< tr >
< td align = "right" > < code > [c: r:]< / code > < / td >
< td align = "left" > using ClassLoader to search resource< / td >
< / tr >
< tr >
< td align = "right" > < code > [c: load:]< / code > < / td >
< td align = "left" > using ClassLoader to load class< / td >
< / tr >
< / tbody >
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< h2 > Usage< a class = "headerlink" href = "#usage" title = "Permalink to this headline" > ¶< / a > < / h2 >
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< h3 > View statistics categorized by class type< a class = "headerlink" href = "#view-statistics-categorized-by-class-type" title = "Permalink to this headline" > ¶< / 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 = "view-statistics-categorized-by-loaded-classes-number" >
< h3 > View statistics categorized by loaded classes number< a class = "headerlink" href = "#view-statistics-categorized-by-loaded-classes-number" title = "Permalink to this headline" > ¶< / 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 = "view-class-loaders-hierarchy" >
< h3 > View class-loaders hierarchy< a class = "headerlink" href = "#view-class-loaders-hierarchy" title = "Permalink to this headline" > ¶< / 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 = "show-the-urls-of-the-urlclassloader" >
< h3 > Show the URLs of the URLClassLoader< a class = "headerlink" href = "#show-the-urls-of-the-urlclassloader" title = "Permalink to this headline" > ¶< / 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 = "use-the-classloader-to-load-resource" >
< h3 > Use the classloader to load resource< a class = "headerlink" href = "#use-the-classloader-to-load-resource" title = "Permalink to this headline" > ¶< / 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 > Use the classloader to load < code class = "docutils literal notranslate" > < span class = "pre" > .class< / span > < / code > resource< / p >
< div class = "highlight-shell notranslate" > < div class = "highlight hljs" > < pre class = "shell" > $ 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 = "use-the-classloader-to-load-class" >
< h3 > Use the classloader to load class< a class = "headerlink" href = "#use-the-classloader-to-load-class" title = "Permalink to this headline" > ¶< / 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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