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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-e0e60120><!--[--><!--]--><div class="right-menu-padding theme-default-content" data-v-e0e60120><!--[--><!--]--><div class="right-menu-wrapper" data-v-e0e60120><div class="right-menu-margin"><div class="right-menu-title">目录</div><div class="right-menu-content"><!--[--><!--]--></div></div></div><div data-v-e0e60120><h1 id="retransform" tabindex="-1"><a class="header-anchor" href="#retransform" aria-hidden="true">#</a> retransform</h1><p><a href="https://arthas.aliyun.com/doc/arthas-tutorials?language=cn&amp;id=command-mc-retransform" target="_blank" rel="noopener noreferrer"><code>mc-retransform</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>加载外部的<code>.class</code>文件retransform jvm 已加载的类。</p></div><p>参考:<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/instrument/Instrumentation.html#retransformClasses-java.lang.Class...-" target="_blank" rel="noopener noreferrer">Instrumentation#retransformClasses<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><h3 id="使用参考" tabindex="-1"><a class="header-anchor" href="#使用参考" aria-hidden="true">#</a> 使用参考</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code> retransform /tmp/Test.class
retransform -l
retransform -d <span class="token number">1</span> <span class="token comment"># delete retransform entry</span>
retransform --deleteAll <span class="token comment"># delete all retransform entries</span>
retransform --classPattern demo.* <span class="token comment"># triger retransform classes</span>
retransform -c 327a647b /tmp/Test.class /tmp/Test<span class="token punctuation">\</span><span class="token variable">$Inner</span>.class
retransform --classLoaderClass <span class="token string">&#39;sun.misc.Launcher$AppClassLoader&#39;</span> /tmp/Test.class
</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="retransform-指定的-class-文件" tabindex="-1"><a class="header-anchor" href="#retransform-指定的-class-文件" aria-hidden="true">#</a> retransform 指定的 .class 文件</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ retransform /tmp/MathGame.class
retransform success, size: <span class="token number">1</span>, classes:
demo.MathGame
</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></div><p>加载指定的 .class 文件,然后解析出 class name再 retransform jvm 中已加载的对应的类。每加载一个 <code>.class</code> 文件,则会记录一个 retransform entry.</p><div class="custom-container tip"><p class="custom-container-title">提示</p><p>如果多次执行 retransform 加载同一个 class 文件,则会有多条 retransform entry.</p></div><h3 id="查看-retransform-entry" tabindex="-1"><a class="header-anchor" href="#查看-retransform-entry" aria-hidden="true">#</a> 查看 retransform entry</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ retransform -l
Id ClassName TransformCount LoaderHash LoaderClassName
<span class="token number">1</span> demo.MathGame <span class="token number">1</span> null null
</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></div><ul><li>TransformCount 统计在 ClassFileTransformer#transform 函数里尝试返回 entry 对应的 .class 文件的次数,但并不表明 transform 一定成功。</li></ul><h3 id="删除指定-retransform-entry" tabindex="-1"><a class="header-anchor" href="#删除指定-retransform-entry" aria-hidden="true">#</a> 删除指定 retransform entry</h3><p>需要指定 id</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>retransform -d <span class="token number">1</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="删除所有-retransform-entry" tabindex="-1"><a class="header-anchor" href="#删除所有-retransform-entry" aria-hidden="true">#</a> 删除所有 retransform entry</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>retransform --deleteAll
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="显式触发-retransform" tabindex="-1"><a class="header-anchor" href="#显式触发-retransform" aria-hidden="true">#</a> 显式触发 retransform</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ retransform --classPattern demo.MathGame
retransform success, size: <span class="token number">1</span>, classes:
demo.MathGame
</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></div><blockquote><p>注意:对于同一个类,当存在多个 retransform entry 时,如果显式触发 retransform ,则最后添加的 entry 生效(id 最大的)。</p></blockquote><h3 id="消除-retransform-的影响" tabindex="-1"><a class="header-anchor" href="#消除-retransform-的影响" aria-hidden="true">#</a> 消除 retransform 的影响</h3><p>如果对某个类执行 retransform 之后,想消除影响,则需要:</p><ul><li>删除这个类对应的 retransform entry</li><li>重新触发 retransform</li></ul><div class="custom-container tip"><p class="custom-container-title">提示</p><p>如果不清除掉所有的 retransform entry并重新触发 retransform ,则 arthas stop 时retransform 过的类仍然生效。</p></div><h3 id="结合-jad-mc-命令使用" tabindex="-1"><a class="header-anchor" href="#结合-jad-mc-命令使用" aria-hidden="true">#</a> 结合 jad/mc 命令使用</h3><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>jad --source-only com.example.demo.arthas.user.UserController <span class="token operator">&gt;</span> /tmp/UserController.java
<span class="token function">mc</span> /tmp/UserController.java -d /tmp
retransform /tmp/com/example/demo/arthas/user/UserController.class
</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><ul><li>jad 命令反编译,然后可以用其它编译器,比如 vim 来修改源码</li><li>mc 命令来内存编译修改过的代码</li><li>用 retransform 命令加载新的字节码</li></ul><h3 id="上传-class-文件到服务器的技巧" tabindex="-1"><a class="header-anchor" href="#上传-class-文件到服务器的技巧" aria-hidden="true">#</a> 上传 .class 文件到服务器的技巧</h3><p>使用<code>mc</code>命令来编译<code>jad</code>的反编译的代码有可能失败。可以在本地修改代码,编译好后再上传到服务器上。有的服务器不允许直接上传文件,可以使用<code>base64</code>命令来绕过。</p><ol><li><p>在本地先转换<code>.class</code>文件为 base64再保存为 result.txt</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>base64 <span class="token operator">&lt;</span> Test.class <span class="token operator">&gt;</span> result.txt
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div></li><li><p>到服务器上,新建并编辑<code>result.txt</code>,复制本地的内容,粘贴再保存</p></li><li><p>把服务器上的 <code>result.txt</code>还原为<code>.class</code></p><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>base64 -d &lt; result.txt &gt; Test.class
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div></li><li><p>用 md5 命令计算哈希值,校验是否一致</p></li></ol><h3 id="retransform-的限制" tabindex="-1"><a class="header-anchor" href="#retransform-的限制" aria-hidden="true">#</a> retransform 的限制</h3><ul><li>不允许新增加 field/method</li><li>正在跑的函数,没有退出不能生效,比如下面新增加的<code>System.out.println</code>,只有<code>run()</code>函数里的会生效</li></ul><div class="language-java ext-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">MathGame</span> <span class="token punctuation">{</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
<span class="token class-name">MathGame</span> game <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MathGame</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
game<span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">TimeUnit</span><span class="token punctuation">.</span>SECONDS<span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 这个不生效,因为代码一直跑在 while里</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;in loop&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
<span class="token comment">// 这个生效因为run()函数每次都可以完整结束</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;call run()&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">{</span>
<span class="token keyword">int</span> number <span class="token operator">=</span> random<span class="token punctuation">.</span><span class="token function">nextInt</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Integer</span><span class="token punctuation">&gt;</span></span> primeFactors <span class="token operator">=</span> <span class="token function">primeFactors</span><span class="token punctuation">(</span>number<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">print</span><span class="token punctuation">(</span>number<span class="token punctuation">,</span> primeFactors<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">.</span><span class="token function">format</span><span class="token punctuation">(</span><span class="token string">&quot;illegalArgumentCount:%3d, &quot;</span><span class="token punctuation">,</span> illegalArgumentCount<span class="token punctuation">)</span> <span class="token operator">+</span> e<span class="token punctuation">.</span><span class="token function">getMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</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 class="line-number"></div><div class="line-number"></div></div></div></div><!--[--><!--]--></div><footer class="page-meta right-menu-padding" data-v-e0e60120><div class="meta-item edit-link"><a class="external-link meta-item-label" href="https://github.com/alibaba/arthas/edit/master/site/docs/doc/retransform.md" rel="noopener noreferrer" target="_blank" aria-label="在 GitHub 上编辑此页"><!--[--><!--]--><span>在 GitHub 上编辑此页</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></div><div class="meta-item last-updated"><span class="meta-item-label">Last Updated: </span><!----></div><div class="meta-item contributors"><span class="meta-item-label">贡献者: </span><span class="meta-item-info"><!--[--><!--[--><span class="contributor" title="email: hengyunabc@gmail.com">hengyunabc</span><!----><!--]--><!--]--></span></div></footer><!----><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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