<!DOCTYPE html>
<!-- [if IE 8]><html class="no - js lt - ie9" lang="zh - CN" > <![endif] -->
<!-- [if gt IE 8]><! --> < html class = "no-js" lang = "zh-CN" > <!-- <![endif] -->
< head >
< meta charset = "utf-8" >
< meta name = "viewport" content = "width=device-width, initial-scale=1.0" >
< title > classloader — Arthas 3.0.5 文档< / title >
< link rel = "shortcut icon" href = "_static/favicon.ico" / >
< link rel = "stylesheet" href = "_static/css/theme.css" type = "text/css" / >
< link rel = "stylesheet" href = "_static/pygments.css" type = "text/css" / >
< link rel = "stylesheet" href = "_static/overrides.css" type = "text/css" / >
< link rel = "index" title = "索引" href = "genindex.html" / >
< link rel = "search" title = "搜索" href = "search.html" / >
< link rel = "next" title = "redefine" href = "redefine.html" / >
< link rel = "prev" title = "jad" href = "jad.html" / >
< script src = "_static/center_page.js" > < / script >
< link rel = "stylesheet" href = "https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/styles/github.min.css" >
< script src = "_static/js/modernizr.min.js" > < / script >
< / head >
< body class = "wy-body-for-nav" >
< div class = "wy-grid-for-nav" >
< nav data-toggle = "wy-nav-shift" class = "wy-nav-side" >
< div class = "wy-side-scroll" >
< div class = "wy-side-nav-search" >
< a href = "index.html" class = "icon icon-home" > Arthas
< / a >
< div class = "version" >
3.0.5
< / div >
< div role = "search" >
< form id = "rtd-search-form" class = "wy-form" action = "search.html" method = "get" >
< input type = "text" name = "q" placeholder = "Search docs" / >
< input type = "hidden" name = "check_keywords" value = "yes" / >
< input type = "hidden" name = "area" value = "default" / >
< / form >
< / div >
< / div >
< div class = "wy-menu wy-menu-vertical" data-spy = "affix" role = "navigation" aria-label = "main navigation" >
< ul class = "current" >
< li class = "toctree-l1" > < a class = "reference external" href = "https://alibaba.github.io/arthas/en/" > English Docs< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "install-detail.html" > 安装< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "quick-start.html" > 快速入门< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "advanced-use.html" > 进阶使用< / a > < / li >
< li class = "toctree-l1 current" > < a class = "reference internal" href = "commands.html" > 命令列表< / a > < ul class = "current" >
< li class = "toctree-l2" > < a class = "reference internal" href = "dashboard.html" > dashboard< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "thread.html" > thread< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "jvm.html" > jvm< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "sysprop.html" > sysprop< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "sysenv.html" > sysenv< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "getstatic.html" > getstatic< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "ognl.html" > ognl< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "sc.html" > sc< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "sm.html" > sm< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "dump.html" > dump< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "jad.html" > jad< / a > < / li >
< li class = "toctree-l2 current" > < a class = "current reference internal" href = "#" > classloader< / a > < ul >
< li class = "toctree-l3" > < a class = "reference internal" href = "#" > 参数说明< / a > < / li >
< li class = "toctree-l3" > < a class = "reference internal" href = "#" > 使用参考< / a > < ul >
< li class = "toctree-l4" > < a class = "reference internal" href = "#" > 按类加载类型查看统计信息< / a > < / li >
< li class = "toctree-l4" > < a class = "reference internal" href = "#" > 按类加载实例查看统计信息< / a > < / li >
< li class = "toctree-l4" > < a class = "reference internal" href = "#classloader" > 查看ClassLoader的继承树< / a > < / li >
< li class = "toctree-l4" > < a class = "reference internal" href = "#urlclassloaderurls" > 查看URLClassLoader实际的urls< / a > < / li >
< li class = "toctree-l4" > < a class = "reference internal" href = "#classloaderresource" > 使用ClassLoader去查找resource< / a > < / li >
< li class = "toctree-l4" > < a class = "reference internal" href = "#classloader" > 使用ClassLoader去加载类< / a > < / li >
< / ul >
< / li >
< / ul >
< / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "redefine.html" > redefine< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "monitor.html" > monitor< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "watch.html" > watch< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "trace.html" > trace< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "stack.html" > stack< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "tt.html" > tt< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "options.html" > options< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "commands.html#arthas" > Arthas 基础命令< / a > < / li >
< / ul >
< / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "docker.html" > Docker< / a > < / li >
< li class = "toctree-l1" > < a class = "reference external" href = "https://github.com/alibaba/arthas/issues?q=label%3Auser-case" > 用户案例< / a > < / li >
< li class = "toctree-l1" > < a class = "reference external" href = "https://github.com/alibaba/arthas/issues?q=label%3Aquestion-answered" > 常见问题< / a > < / li >
< li class = "toctree-l1" > < a class = "reference external" href = "https://github.com/alibaba/arthas" > Fork me at GitHub< / a > < / li >
< li class = "toctree-l1" > < a class = "reference external" href = "https://github.com/alibaba/arthas/blob/master/CONTRIBUTING.md" > 参与贡献< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "release-notes.html" > Release Notes< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "contact-us.html" > QQ群/钉钉群< / a > < / li >
< / ul >
< / div >
< / div >
< / nav >
< section data-toggle = "wy-nav-shift" class = "wy-nav-content-wrap" >
< nav class = "wy-nav-top" aria-label = "top navigation" >
< i data-toggle = "wy-nav-top" class = "fa fa-bars" > < / i >
< a href = "index.html" > Arthas< / a >
< / nav >
< div class = "wy-nav-content" >
< div class = "rst-content" >
< div role = "navigation" aria-label = "breadcrumbs navigation" >
< ul class = "wy-breadcrumbs" >
< li > < a href = "index.html" > Docs< / a > » < / li >
< li > < a href = "commands.html" > 命令列表< / a > » < / li >
< li > classloader< / li >
< li class = "wy-breadcrumbs-aside" >
< a href = "https://github.com/alibaba/arthas/blob/master/site/src/site/sphinx/classloader.md" class = "fa fa-github" > Edit on GitHub< / a >
< / li >
< / ul >
< hr / >
< / div >
< div role = "main" class = "document" itemscope = "itemscope" itemtype = "http://schema.org/Article" >
< div itemprop = "articleBody" >
< div class = "section" id = "classloader" >
< 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 > < tt class = "docutils literal" > classloader< / tt > 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， < tt class = "docutils literal" > ResourceNotFoundException< / tt > 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" > < 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 = "" >
< span id = "id2" > < / span > < h2 > 使用参考< a class = "headerlink" href = "#" title = "永久链接至标题" > ¶< / a > < / h2 >
< div class = "section" id = "" >
< span id = "id3" > < / span > < h3 > 按类加载类型查看统计信息< a class = "headerlink" href = "#" 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 = "" >
< span id = "id4" > < / span > < h3 > 按类加载实例查看统计信息< a class = "headerlink" href = "#" 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 = "classloader" >
< span id = "id5" > < / span > < h3 > 查看ClassLoader的继承树< a class = "headerlink" href = "#classloader" 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" >
< span id = "urlclassloaderurls" > < / span > < 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" >
< span id = "classloaderresource" > < / span > < 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 = "classloader" >
< span id = "id6" > < / span > < h3 > 使用ClassLoader去加载类< a class = "headerlink" href = "#classloader" 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 >
< / div >
< / div >
< / div >
< / div >
< / div >
< / div >
< footer >
< div class = "rst-footer-buttons" role = "navigation" aria-label = "footer navigation" >
< a href = "redefine.html" class = "btn btn-neutral float-right" title = "redefine" accesskey = "n" rel = "next" > Next < span class = "fa fa-arrow-circle-right" > < / span > < / a >
< a href = "jad.html" class = "btn btn-neutral" title = "jad" accesskey = "p" rel = "prev" > < span class = "fa fa-arrow-circle-left" > < / span > Previous< / a >
< / div >
< hr / >
< div role = "contentinfo" >
< p >
© Copyright 2018, Alibaba Middleware Group, and contributors.
< / p >
< / div >
Built with < a href = "http://sphinx-doc.org/" > Sphinx< / a > using a < a href = "https://github.com/rtfd/sphinx_rtd_theme" > theme< / a > provided by < a href = "https://readthedocs.org" > Read the Docs< / a > .
< / footer >
< / div >
< / div >
< / section >
< / div >
< script type = "text/javascript" >
var DOCUMENTATION_OPTIONS = {
URL_ROOT:'./',
VERSION:'3.0.5',
LANGUAGE:'zh_CN',
COLLAPSE_INDEX:false,
FILE_SUFFIX:'.html',
HAS_SOURCE: true,
SOURCELINK_SUFFIX: '.txt'
};
< / script >
< script type = "text/javascript" src = "_static/jquery.js" > < / script >
< script type = "text/javascript" src = "_static/underscore.js" > < / script >
< script type = "text/javascript" src = "_static/doctools.js" > < / script >
< script type = "text/javascript" src = "_static/translations.js" > < / script >
< script type = "text/javascript" src = "https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML" > < / script >
< script type = "text/javascript" src = "_static/js/theme.js" > < / script >
< script type = "text/javascript" >
jQuery(function () {
SphinxRtdTheme.Navigation.enable(true);
});
< / script >
< div class = "github-fork-ribbon-wrapper right" >
< div class = "github-fork-ribbon" >
< a href = "https://github.com/alibaba/arthas" > Fork me at GitHub< / a >
< / div >
< / div >
< script type = "text/javascript" src = "_static/add_badges.js" > < / script >
< script src = "https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/highlight.min.js" > < / script >
< script src = "https://cdnjs.cloudflare.com/ajax/libs/highlightjs-line-numbers.js/2.5.0/highlightjs-line-numbers.min.js" > < / script >
< script >
document.querySelectorAll('div.hljs > pre').forEach(function(block) {
hljs.highlightBlock(block);
hljs.lineNumbersBlock(block);
});
< / script >
< script >
var _hmt = _hmt || [];
(function() {
var hm = document.createElement("script");
hm.src = "https://hm.baidu.com/hm.js?d5c5e25b100f0eb51a4c35c8a86ea9b4";
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(hm, s);
})();
< / script >
< / body >
< / html >
