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74 KiB
HTML
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Starter"><!--[--><!--]--> Arthas Spring Boot Starter <!--[--><!--]--></a><!----></li><li><a href="/doc/idea-plugin.html" class="sidebar-item" aria-label="IDEA Plugin"><!--[--><!--]--> IDEA Plugin <!--[--><!--]--></a><!----></li><li><a href="/doc/faq.html" class="sidebar-item" aria-label="FAQ"><!--[--><!--]--> FAQ <!--[--><!--]--></a><!----></li><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/issues?q=label%3Auser-case" rel="noopener noreferrer" target="_blank" aria-label="用户案例"><!--[--><!--]--><span>用户案例</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a><!----></li><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas" rel="noopener noreferrer" target="_blank" aria-label="Star me at github"><!--[--><!--]--><span>Star me at github</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a><!----></li><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/blob/master/CONTRIBUTING.md" rel="noopener noreferrer" target="_blank" aria-label="编译调试/参与贡献"><!--[--><!--]--><span>编译调试/参与贡献</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a><!----></li><li><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/releases" rel="noopener noreferrer" target="_blank" aria-label="Release Notes"><!--[--><!--]--><span>Release Notes</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span><!--[--><!--]--></a><!----></li><li><a href="/doc/contact-us.md" class="sidebar-item" aria-label="QQ群/钉钉群"><!--[--><!--]--> QQ群/钉钉群 <!--[--><!--]--></a><!----></li><!--]--></ul></li><!--]--></ul><!--[--><!--]--></aside><!--]--><!--[--><main class="page" data-v-fdd717e0><!--[--><!--]--><div class="right-menu-padding theme-default-content" data-v-fdd717e0><!--[--><!--]--><div class="right-menu-wrapper" data-v-fdd717e0 data-v-2b64a081><div class="right-menu-margin" data-v-2b64a081><div class="right-menu-title" data-v-2b64a081>目录</div><div class="right-menu-content" data-v-2b64a081><!--[--><!--]--></div></div></div><div data-v-fdd717e0><h1 id="classloader" tabindex="-1"><a class="header-anchor" href="#classloader" aria-hidden="true">#</a> classloader</h1><p><a href="https://arthas.aliyun.com/doc/arthas-tutorials?language=cn&id=command-classloader" target="_blank" rel="noopener noreferrer"><code>classloader</code>在线教程<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口打开</span></span></a></p><div class="custom-container tip"><p class="custom-container-title">提示</p><p>查看 classloader 的继承树，urls，类加载信息</p></div><p><code>classloader</code> 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。</p><p>可以让指定的 classloader 去 getResources，打印出所有查找到的 resources 的 url。对于<code>ResourceNotFoundException</code>比较有用。</p><h2 id="参数说明" tabindex="-1"><a class="header-anchor" href="#参数说明" aria-hidden="true">#</a> 参数说明</h2><table><thead><tr><th style="text-align:right;">参数名称</th><th style="text-align:left;">参数说明</th></tr></thead><tbody><tr><td style="text-align:right;">[l]</td><td style="text-align:left;">按类加载实例进行统计</td></tr><tr><td style="text-align:right;">[t]</td><td style="text-align:left;">打印所有 ClassLoader 的继承树</td></tr><tr><td style="text-align:right;">[a]</td><td style="text-align:left;">列出所有 ClassLoader 加载的类，请谨慎使用</td></tr><tr><td style="text-align:right;"><code>[c:]</code></td><td style="text-align:left;">ClassLoader 的 hashcode</td></tr><tr><td style="text-align:right;"><code>[classLoaderClass:]</code></td><td style="text-align:left;">指定执行表达式的 ClassLoader 的 class name</td></tr><tr><td style="text-align:right;"><code>[c: r:]</code></td><td style="text-align:left;">用 ClassLoader 去查找 resource</td></tr><tr><td style="text-align:right;"><code>[c: load:]</code></td><td style="text-align:left;">用 ClassLoader 去加载指定的类</td></tr></tbody></table><h2 id="使用参考" tabindex="-1"><a class="header-anchor" href="#使用参考" aria-hidden="true">#</a> 使用参考</h2><h3 id="按类加载类型查看统计信息" tabindex="-1"><a class="header-anchor" href="#按类加载类型查看统计信息" aria-hidden="true">#</a> 按类加载类型查看统计信息</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader
|
|
name numberOfInstances loadedCountTotal
|
|
com.taobao.arthas.agent.ArthasClassloader <span class="token number">1</span> <span class="token number">2115</span>
|
|
BootstrapClassLoader <span class="token number">1</span> <span class="token number">1861</span>
|
|
sun.reflect.DelegatingClassLoader <span class="token number">5</span> <span class="token number">5</span>
|
|
sun.misc.Launcher<span class="token variable">$AppClassLoader</span> <span class="token number">1</span> <span class="token number">4</span>
|
|
sun.misc.Launcher<span class="token variable">$ExtClassLoader</span> <span class="token number">1</span> <span class="token number">1</span>
|
|
Affect<span class="token punctuation">(</span>row-cnt:5<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">3</span> ms.
|
|
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="按类加载实例查看统计信息" tabindex="-1"><a class="header-anchor" href="#按类加载实例查看统计信息" aria-hidden="true">#</a> 按类加载实例查看统计信息</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">-l</span>
|
|
name loadedCount <span class="token builtin class-name">hash</span> parent
|
|
BootstrapClassLoader <span class="token number">1861</span> null null
|
|
com.taobao.arthas.agent.ArthasClassloader@68b31f0a <span class="token number">2115</span> 68b31f0a sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@66350f69
|
|
sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@3d4eac69 <span class="token number">4</span> 3d4eac69 sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@66350f69
|
|
sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@66350f69 <span class="token number">1</span> 66350f69 null
|
|
Affect<span class="token punctuation">(</span>row-cnt:4<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">2</span> ms.
|
|
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="查看-classloader-的继承树" tabindex="-1"><a class="header-anchor" href="#查看-classloader-的继承树" aria-hidden="true">#</a> 查看 ClassLoader 的继承树</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">-t</span>
|
|
+-BootstrapClassLoader
|
|
+-sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@66350f69
|
|
+-com.taobao.arthas.agent.ArthasClassloader@68b31f0a
|
|
+-sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@3d4eac69
|
|
Affect<span class="token punctuation">(</span>row-cnt:4<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">3</span> ms.
|
|
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="查看-urlclassloader-实际的-urls" tabindex="-1"><a class="header-anchor" href="#查看-urlclassloader-实际的-urls" aria-hidden="true">#</a> 查看 URLClassLoader 实际的 urls</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">-c</span> 3d4eac69
|
|
file:/private/tmp/math-game.jar
|
|
file:/Users/hengyunabc/.arthas/lib/3.0.5/arthas/arthas-agent.jar
|
|
|
|
Affect<span class="token punctuation">(</span>row-cnt:9<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">3</span> ms.
|
|
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p><em>注意</em> hashcode 是变化的，需要先查看当前的 ClassLoader 信息，提取对应 ClassLoader 的 hashcode。</p><p>对于只有唯一实例的 ClassLoader 可以通过 class name 指定，使用起来更加方便：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">--classLoaderClass</span> sun.misc.Launcher<span class="token variable">$AppClassLoader</span>
|
|
file:/private/tmp/math-game.jar
|
|
file:/Users/hengyunabc/.arthas/lib/3.0.5/arthas/arthas-agent.jar
|
|
|
|
Affect<span class="token punctuation">(</span>row-cnt:9<span class="token punctuation">)</span> cost <span class="token keyword">in</span> <span class="token number">3</span> ms.
|
|
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="使用-classloader-去查找-resource" tabindex="-1"><a class="header-anchor" href="#使用-classloader-去查找-resource" aria-hidden="true">#</a> 使用 ClassLoader 去查找 resource</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">-c</span> 3d4eac69 <span class="token parameter variable">-r</span> META-INF/MANIFEST.MF
|
|
jar:file:/System/Library/Java/Extensions/MRJToolkit.jar<span class="token operator">!</span>/META-INF/MANIFEST.MF
|
|
jar:file:/private/tmp/math-game.jar<span class="token operator">!</span>/META-INF/MANIFEST.MF
|
|
jar:file:/Users/hengyunabc/.arthas/lib/3.0.5/arthas/arthas-agent.jar<span class="token operator">!</span>/META-INF/MANIFEST.MF
|
|
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>也可以尝试查找类的 class 文件：</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">-c</span> 1b6d3586 <span class="token parameter variable">-r</span> java/lang/String.class
|
|
jar:file:/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/rt.jar<span class="token operator">!</span>/java/lang/String.class
|
|
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="使用-classloader-去加载类" tabindex="-1"><a class="header-anchor" href="#使用-classloader-去加载类" aria-hidden="true">#</a> 使用 ClassLoader 去加载类</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">-c</span> 3d4eac69 <span class="token parameter variable">--load</span> demo.MathGame
|
|
load class success.
|
|
class-info demo.MathGame
|
|
code-source /private/tmp/math-game.jar
|
|
name demo.MathGame
|
|
isInterface <span class="token boolean">false</span>
|
|
isAnnotation <span class="token boolean">false</span>
|
|
isEnum <span class="token boolean">false</span>
|
|
isAnonymousClass <span class="token boolean">false</span>
|
|
isArray <span class="token boolean">false</span>
|
|
isLocalClass <span class="token boolean">false</span>
|
|
isMemberClass <span class="token boolean">false</span>
|
|
isPrimitive <span class="token boolean">false</span>
|
|
isSynthetic <span class="token boolean">false</span>
|
|
simple-name MathGame
|
|
modifier public
|
|
annotation
|
|
interfaces
|
|
super-class +-java.lang.Object
|
|
class-loader +-sun.misc.Launcher<span class="token variable">$AppClassLoader</span>@3d4eac69
|
|
+-sun.misc.Launcher<span class="token variable">$ExtClassLoader</span>@66350f69
|
|
classLoaderHash 3d4eac69
|
|
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="统计-classloader-实际使用-url-和未使用的-url" tabindex="-1"><a class="header-anchor" href="#统计-classloader-实际使用-url-和未使用的-url" aria-hidden="true">#</a> 统计 ClassLoader 实际使用 URL 和未使用的 URL</h3><div class="custom-container warning"><p class="custom-container-title">注意</p><p>注意，基于 JVM 目前已加载的所有类统计，不代表<code>Unused URLs</code>可以从应用中删掉。因为可能将来需要从<code>Unused URLs</code>里加载类，或者需要加载<code>resources</code>。</p></div><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ classloader --url-stat
|
|
com.taobao.arthas.agent.ArthasClassloader@3c41660, hash:3c41660
|
|
Used URLs:
|
|
file:/Users/admin/.arthas/lib/3.5.6/arthas/arthas-core.jar
|
|
Unused URLs:
|
|
|
|
sun.misc.Launcher$AppClassLoader@75b84c92, hash:75b84c92
|
|
Used URLs:
|
|
file:/Users/admin/code/java/arthas/math-game/target/math-game.jar
|
|
file:/Users/admin/.arthas/lib/3.5.6/arthas/arthas-agent.jar
|
|
Unused URLs:
|
|
|
|
sun.misc.Launcher$ExtClassLoader@7f31245a, hash:7f31245a
|
|
Used URLs:
|
|
file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/sunec.jar
|
|
file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/sunjce_provider.jar
|
|
file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/localedata.jar
|
|
Unused URLs:
|
|
file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/nashorn.jar
|
|
file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/cldrdata.jar
|
|
file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/legacy8ujsse.jar
|
|
file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/jfxrt.jar
|
|
file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/dnsns.jar
|
|
file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/openjsse.jar
|
|
file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/sunpkcs11.jar
|
|
file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/jaccess.jar
|
|
file:/tmp/jdk1.8/Contents/Home/jre/lib/ext/zipfs.jar
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