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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-8e2a76de><!--[--><!--]--><div class="right-menu-padding theme-default-content" data-v-8e2a76de><!--[--><!--]--><div class="right-menu-wrapper" data-v-8e2a76de data-v-7789db5c><div class="right-menu-margin" data-v-7789db5c><div class="right-menu-title" data-v-7789db5c>目录</div><div class="right-menu-content" data-v-7789db5c><!--[--><!--]--></div></div></div><div data-v-8e2a76de><h1 id="redefine" tabindex="-1"><a class="header-anchor" href="#redefine" aria-hidden="true">#</a> redefine</h1><div class="custom-container tip"><p class="custom-container-title">提示</p><p>推荐使用 <a href="/doc/retransform.html" class="">retransform</a> 命令</p></div><p><a href="https://arthas.aliyun.com/doc/arthas-tutorials?language=cn&id=command-mc-redefine" target="_blank" rel="noopener noreferrer"><code>mc-redefine</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，redefine 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#redefineClasses-java.lang.instrument.ClassDefinition...-" target="_blank" rel="noopener noreferrer">Instrumentation#redefineClasses<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><h2 id="常见问题" tabindex="-1"><a class="header-anchor" href="#常见问题" aria-hidden="true">#</a> 常见问题</h2><div class="custom-container tip"><p class="custom-container-title">提示</p><p>推荐使用 <a href="/doc/retransform.html" class="">retransform</a> 命令</p></div><ul><li><p>redefine 的 class 不能修改、添加、删除类的 field 和 method，包括方法参数、方法名称及返回值</p></li><li><p>如果 mc 失败，可以在本地开发环境编译好 class 文件，上传到目标系统，使用 redefine 热加载 class</p></li><li><p>目前 redefine 和 watch/trace/jad/tt 等命令冲突，以后重新实现 redefine 功能会解决此问题</p></li></ul><div class="custom-container warning"><p class="custom-container-title">注意</p><p>注意， redefine 后的原来的类不能恢复，redefine 有可能失败（比如增加了新的 field），参考 jdk 本身的文档。</p></div><div class="custom-container tip"><p class="custom-container-title">提示</p><p><code>reset</code>命令对<code>redefine</code>的类无效。如果想重置，需要<code>redefine</code>原始的字节码。</p></div><div class="custom-container tip"><p class="custom-container-title">提示</p><p><code>redefine</code>命令和<code>jad</code>/<code>watch</code>/<code>trace</code>/<code>monitor</code>/<code>tt</code>等命令会冲突。执行完<code>redefine</code>之后，如果再执行上面提到的命令，则会把<code>redefine</code>的字节码重置。 原因是 jdk 本身 redefine 和 Retransform 是不同的机制，同时使用两种机制来更新字节码，只有最后修改的会生效。</p></div><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;">[c:]</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></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><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code> redefine /tmp/Test.class
|