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<li class="toctree-l2 current"><a class="current reference internal" href="#">retransform</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="#id1">使用参考</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#retransform-class">retransform 指定的 .class 文件</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#retransform-entry">查看 retransform entry</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#id2">删除指定 retransform entry</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#id3">删除所有 retransform entry</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#id4">显式触发 retransform</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#id5">消除 retransform 的影响</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#id6">retransform的限制</a></li>
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<div class="section" id="retransform">
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<h1>retransform<a class="headerlink" href="#retransform" title="永久链接至标题">¶</a></h1>
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<blockquote>
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<div><p>加载外部的<code class="docutils literal notranslate"><span class="pre">.class</span></code>文件，retransform jvm已加载的类。</p>
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</div></blockquote>
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<p>参考：<a class="reference external" href="https://docs.oracle.com/javase/8/docs/api/java/lang/instrument/Instrumentation.html#retransformClasses-java.lang.Class...-">Instrumentation#retransformClasses</a></p>
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<div class="section" id="id1">
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<h2>使用参考<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash"> retransform /tmp/Test.class
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retransform -l
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retransform -d 1 # delete retransform entry
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retransform --deleteAll # delete all retransform entries
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retransform --classPattern demo.* # triger retransform classes
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retransform -c 327a647b /tmp/Test.class /tmp/Test\$Inner.class
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retransform --classLoaderClass 'sun.misc.Launcher$AppClassLoader' /tmp/Test.class</pre></div>
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</div>
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</div>
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<div class="section" id="retransform-class">
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<h2>retransform 指定的 .class 文件<a class="headerlink" href="#retransform-class" title="永久链接至标题">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ retransform /tmp/MathGame.class
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retransform success, size: 1, classes:
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demo.MathGame</pre></div>
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</div>
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<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="docutils literal notranslate"><span class="pre">.class</span></code> 文件，则会记录一个 retransform entry.</p>
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<blockquote>
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<div><p>如果多次执行 retransform 加载同一个 class 文件，则会有多条 retransform entry.</p>
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</div></blockquote>
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</div>
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<div class="section" id="retransform-entry">
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<h2>查看 retransform entry<a class="headerlink" href="#retransform-entry" title="永久链接至标题">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ retransform -l
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Id ClassName TransformCount LoaderHash LoaderClassName
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1 demo.MathGame 1 null null</pre></div>
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</div>
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<ul class="simple">
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<li><p>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。</p></li>
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</ul>
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</div>
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<div class="section" id="id2">
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<h2>删除指定 retransform entry<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
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<p>需要指定 id：</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">retransform -d 1</pre></div>
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</div>
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</div>
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<div class="section" id="id3">
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<h2>删除所有 retransform entry<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">retransform --deleteAll</pre></div>
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</div>
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</div>
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<div class="section" id="id4">
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<h2>显式触发 retransform<a class="headerlink" href="#id4" title="永久链接至标题">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ retransform --classPattern demo.MathGame
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retransform success, size: 1, classes:
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demo.MathGame</pre></div>
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</div>
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<blockquote>
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<div><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>
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</div></blockquote>
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</div>
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<div class="section" id="id5">
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<h2>消除 retransform 的影响<a class="headerlink" href="#id5" title="永久链接至标题">¶</a></h2>
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<p>如果对某个类执行 retransform 之后，想消除影响，则需要：</p>
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<ul class="simple">
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<li><p>删除这个类对应的 retransform entry</p></li>
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<li><p>重新触发 retransform</p></li>
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</ul>
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<blockquote>
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<div><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>
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</div></blockquote>
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</div>
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<div class="section" id="jad-mc">
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<h2>结合 jad/mc 命令使用<a class="headerlink" href="#jad-mc" title="永久链接至标题">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">jad --source-only com.example.demo.arthas.user.UserController > /tmp/UserController.java
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mc /tmp/UserController.java -d /tmp
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retransform /tmp/com/example/demo/arthas/user/UserController.class</pre></div>
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</div>
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<ul class="simple">
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<li><p>jad命令反编译，然后可以用其它编译器，比如vim来修改源码</p></li>
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<li><p>mc命令来内存编译修改过的代码</p></li>
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<li><p>用retransform命令加载新的字节码</p></li>
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</ul>
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</div>
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<div class="section" id="class">
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<h2>上传 .class 文件到服务器的技巧<a class="headerlink" href="#class" title="永久链接至标题">¶</a></h2>
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<p>使用<code class="docutils literal notranslate"><span class="pre">mc</span></code>命令来编译<code class="docutils literal notranslate"><span class="pre">jad</span></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 class="docutils literal notranslate"><span class="pre">base64</span></code>命令来绕过。</p>
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<ol>
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<li><p>在本地先转换<code class="docutils literal notranslate"><span class="pre">.class</span></code>文件为base64，再保存为result.txt</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">base64 < Test.class > result.txt</pre></div>
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</div>
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</li>
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<li><p>到服务器上，新建并编辑<code class="docutils literal notranslate"><span class="pre">result.txt</span></code>，复制本地的内容，粘贴再保存</p></li>
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<li><p>把服务器上的 <code class="docutils literal notranslate"><span class="pre">result.txt</span></code>还原为<code class="docutils literal notranslate"><span class="pre">.class</span></code></p>
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<div class="highlight-default notranslate"><pre class="literal-block">base64 -d < result.txt > Test.class</pre>
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</div>
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</li>
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<li><p>用md5命令计算哈希值，校验是否一致</p></li>
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</ol>
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</div>
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<div class="section" id="id6">
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<h2>retransform的限制<a class="headerlink" href="#id6" title="永久链接至标题">¶</a></h2>
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<ul>
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<li><p>不允许新增加field/method</p></li>
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<li><p>正在跑的函数，没有退出不能生效，比如下面新增加的<code class="docutils literal notranslate"><span class="pre">System.out.println</span></code>，只有<code class="docutils literal notranslate"><span class="pre">run()</span></code>函数里的会生效</p>
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<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">public class MathGame {
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public static void main(String[] args) throws InterruptedException {
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MathGame game = new MathGame();
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while (true) {
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game.run();
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TimeUnit.SECONDS.sleep(1);
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// 这个不生效，因为代码一直跑在 while里
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System.out.println("in loop");
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}
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}
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public void run() throws InterruptedException {
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// 这个生效，因为run()函数每次都可以完整结束
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System.out.println("call run()");
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try {
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int number = random.nextInt();
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List<Integer> primeFactors = primeFactors(number);
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print(number, primeFactors);
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} catch (Exception e) {
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System.out.println(String.format("illegalArgumentCount:%3d, ", illegalArgumentCount) + e.getMessage());
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}
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}</pre></div>
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</div>
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</li>
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</ul>
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<div class="highlight-default notranslate"><pre class="literal-block"></pre>
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</div>
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