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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="#usage">Usage</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#retransform-the-specified-class-file">retransform the specified .class file</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#view-retransform-entry">View retransform entry</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#delete-the-specified-retransform-entry">Delete the specified retransform entry</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#delete-all-retransform-entries">Delete all retransform entries</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#explicitly-trigger-retransform">Explicitly trigger retransform</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#eliminate-the-influence-of-retransform">Eliminate the influence of retransform</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#restrictions-of-the-retransform-command">Restrictions of the retransform command</a></li>
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<div class="section" id="retransform">
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<h1>retransform<a class="headerlink" href="#retransform" title="Permalink to this headline">¶</a></h1>
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<p><a class="reference external" href="https://arthas.aliyun.com/doc/arthas-tutorials?language=en&id=command-mc-retransform"><code class="docutils literal notranslate"><span class="pre">mc-retransform</span></code> online tutorial</a></p>
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<blockquote>
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<div><p>Load the external <code class="docutils literal notranslate"><span class="pre">*.class</span></code> files to retransform the loaded classes in JVM.</p>
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</div></blockquote>
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<p>Reference: <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="usage">
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<h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</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$AppClassLoader' /tmp/Test.class</pre></div>
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</div>
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</div>
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<div class="section" id="retransform-the-specified-class-file">
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<h2>retransform the specified .class file<a class="headerlink" href="#retransform-the-specified-class-file" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ 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>Load the specified .class file, then parse out the class name, and then retransform the corresponding class loaded in the jvm. Every time a <code class="docutils literal notranslate"><span class="pre">.class</span></code> file is loaded, a retransform entry is recorded.</p>
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<blockquote>
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<div><p>If retransform is executed multiple times to load the same class file, there will be multiple retransform entries.</p>
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</div></blockquote>
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</div>
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<div class="section" id="view-retransform-entry">
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<h2>View retransform entry<a class="headerlink" href="#view-retransform-entry" title="Permalink to this headline">¶</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 counts the times of attempts to return the .class file corresponding to the entry in the ClassFileTransformer#transform method, but it does not mean that the transform must be successful.</p></li>
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</ul>
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</div>
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<div class="section" id="delete-the-specified-retransform-entry">
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<h2>Delete the specified retransform entry<a class="headerlink" href="#delete-the-specified-retransform-entry" title="Permalink to this headline">¶</a></h2>
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<p>Need to specify 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="delete-all-retransform-entries">
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<h2>Delete all retransform entries<a class="headerlink" href="#delete-all-retransform-entries" title="Permalink to this headline">¶</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="explicitly-trigger-retransform">
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<h2>Explicitly trigger retransform<a class="headerlink" href="#explicitly-trigger-retransform" title="Permalink to this headline">¶</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>Note: For the same class, when there are multiple retransform entries, if retransform is explicitly triggered, the entry added last will take effect (the one with the largest id).</p>
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</div></blockquote>
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</div>
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<div class="section" id="eliminate-the-influence-of-retransform">
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<h2>Eliminate the influence of retransform<a class="headerlink" href="#eliminate-the-influence-of-retransform" title="Permalink to this headline">¶</a></h2>
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<p>If you want to eliminate the impact after performing retransform on a class, you need to:</p>
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<ul class="simple">
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<li><p>Delete the retransform entry corresponding to this class</p></li>
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<li><p>Re-trigger retransform</p></li>
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</ul>
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<blockquote>
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<div><p>If you do not clear all retransform entries and trigger retransform again, the retransformed classes will still take effect when arthas stop.</p>
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</div></blockquote>
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</div>
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<div class="section" id="use-with-the-jad-mc-command">
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<h2>Use with the jad/mc command<a class="headerlink" href="#use-with-the-jad-mc-command" title="Permalink to this headline">¶</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>Use <code class="docutils literal notranslate"><span class="pre">jad</span></code> command to decompile bytecode, and then you can use other editors, such as vim to modify the source code.</p></li>
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<li><p><code class="docutils literal notranslate"><span class="pre">mc</span></code> command to compile the modified code</p></li>
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<li><p>Load new bytecode with <code class="docutils literal notranslate"><span class="pre">retransform</span></code> command</p></li>
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</ul>
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</div>
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<div class="section" id="tips-for-uploading-class-files-to-the-server">
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<h2>Tips for uploading .class files to the server<a class="headerlink" href="#tips-for-uploading-class-files-to-the-server" title="Permalink to this headline">¶</a></h2>
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<p>The <code class="docutils literal notranslate"><span class="pre">mc</span></code> command may fail. You can modify the code locally, compile it, and upload it to the server. Some servers do not allow direct uploading files, you can use the <code class="docutils literal notranslate"><span class="pre">base64</span></code> command to bypass.</p>
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<ol>
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<li><p>Convert the <code class="docutils literal notranslate"><span class="pre">.class</span></code> file to base64 first, then save it as 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>Login the server, create and edit <code class="docutils literal notranslate"><span class="pre">result.txt</span></code>, copy the local content, paste and save</p></li>
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<li><p>Restore <code class="docutils literal notranslate"><span class="pre">result.txt</span></code> on the server to <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>Use the md5 command to verify that the <code class="docutils literal notranslate"><span class="pre">.class</span></code> files are consistent.</p></li>
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</ol>
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</div>
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<div class="section" id="restrictions-of-the-retransform-command">
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<h2>Restrictions of the retransform command<a class="headerlink" href="#restrictions-of-the-retransform-command" title="Permalink to this headline">¶</a></h2>
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<ul>
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<li><p>New field/method is not allowed</p></li>
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<li><p>The function that is running, no exit can not take effect, such as the new <code class="docutils literal notranslate"><span class="pre">System.out.println</span></code> added below, only the <code class="docutils literal notranslate"><span class="pre">run()</span></code> function will take effect.</p>
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<div class="highlight-java notranslate"><div class="highlight hljs"><pre class="java">public class MathGame {
|
|
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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// This doesn't work because the code keeps running in while
|
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System.out.println("in loop");
|
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}
|
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}
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|
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|
public void run() throws InterruptedException {
|
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// This works because the run() function ends completely every time
|
|
System.out.println("call run()");
|
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try {
|
|
int number = random.nextInt();
|
|
List<Integer> primeFactors = primeFactors(number);
|
|
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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