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aria-label="dashboard" data-v-558ea87d><!--[--><!--]--> dashboard <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/dump.html" class="sidebar-item" aria-label="dump" data-v-558ea87d><!--[--><!--]--> dump <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/echo.html" class="sidebar-item" aria-label="echo" data-v-558ea87d><!--[--><!--]--> echo <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/getstatic.html" class="sidebar-item" aria-label="getstatic" data-v-558ea87d><!--[--><!--]--> getstatic <!--[--><!--]--></a></div><!----></li><li 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data-v-558ea87d><!--[--><!--]--> Docker <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/web-console.html" class="sidebar-item" aria-label="Web Console" data-v-558ea87d><!--[--><!--]--> Web Console <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/tunnel.html" class="sidebar-item" aria-label="Arthas Tunnel" data-v-558ea87d><!--[--><!--]--> Arthas Tunnel <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/idea-plugin.html" class="sidebar-item" aria-label="IDEA Plugin" data-v-558ea87d><!--[--><!--]--> IDEA Plugin <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/arthas-properties.html" class="sidebar-item" aria-label="Arthas Properties" data-v-558ea87d><!--[--><!--]--> Arthas Properties <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/agent.html" class="sidebar-item" aria-label="以 Java Agent 的方式启动" data-v-558ea87d><!--[--><!--]--> 以 Java Agent 的方式启动 <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/spring-boot-starter.html" class="sidebar-item" aria-label="Arthas Spring Boot Starter" data-v-558ea87d><!--[--><!--]--> Arthas Spring Boot Starter <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/external-command.html" class="sidebar-item" aria-label="加载外部命令" data-v-558ea87d><!--[--><!--]--> 加载外部命令 <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/http-api.html" class="sidebar-item" aria-label="Http API" data-v-558ea87d><!--[--><!--]--> Http API <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/batch-support.html" class="sidebar-item" aria-label="批处理功能" data-v-558ea87d><!--[--><!--]--> 批处理功能 <!--[--><!--]--></a></div><!----></li><!--]--></ul></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/faq.html" class="sidebar-item" aria-label="FAQ" data-v-558ea87d><!--[--><!--]--> FAQ <!--[--><!--]--></a></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><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" data-v-558ea87d><!--[--><!--]--><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></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas" rel="noopener noreferrer" target="_blank" aria-label="Star me at github" data-v-558ea87d><!--[--><!--]--><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></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><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" data-v-558ea87d><!--[--><!--]--><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></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a class="external-link sidebar-item" href="https://github.com/alibaba/arthas/releases" rel="noopener noreferrer" target="_blank" aria-label="Release Notes" data-v-558ea87d><!--[--><!--]--><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></div><!----></li><li data-v-558ea87d data-v-558ea87d><div class="sidebar-tree-row" data-v-558ea87d><span class="sidebar-tree-toggle-placeholder" data-v-558ea87d></span><a href="/doc/contact-us.md" class="sidebar-item" aria-label="QQ 群/钉钉群" data-v-558ea87d><!--[--><!--]--> QQ 群/钉钉群 <!--[--><!--]--></a></div><!----></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-64666cd5><div class="right-menu-margin" data-v-64666cd5><div class="right-menu-title" data-v-64666cd5>目录</div><div class="right-menu-content" data-v-64666cd5><!--[--><!--]--></div></div></div><div data-v-fdd717e0><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><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
redefine <span class="token parameter variable">-c</span> 327a647b /tmp/Test.class /tmp/Test<span class="token punctuation">\</span><span class="token variable">$Inner</span>.class
redefine <span class="token parameter variable">--classLoaderClass</span> sun.misc.Launcher<span class="token variable">$AppClassLoader</span> /tmp/Test.class /tmp/Test<span class="token punctuation">\</span><span class="token variable">$Inner</span>.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></div><h2 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</h2><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 <span class="token parameter variable">-d</span> /tmp
redefine /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 redefine 命令加载新的字节码</li></ul><h2 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</h2><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><h2 id="redefine-的限制" tabindex="-1"><a class="header-anchor" href="#redefine-的限制" aria-hidden="true">#</a> redefine 的限制</h2><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><span class="token constant">SECONDS</span><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>
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