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class="site-page child" href="/movies/"><i class="fa-fw fas fa-video"></i><span> 电影</span></a></li></ul></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> 友情链接</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fas fa-heart"></i><span> 关于</span></a></div></div><div id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">Spring IoC 循环依赖问题</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2022-07-30T06:53:41.000Z" title="发表于 2022-07-30 14:53:41">2022-07-30</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-10-08T12:04:35.865Z" title="更新于 2022-10-08 20:04:35">2022-10-08</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Java-%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/">Java 学习笔记</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Java-%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/Spring-%E6%A1%86%E6%9E%B6/">Spring 框架</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">623</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>2分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="Spring IoC 循环依赖问题"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="Spring-IoC-循环依赖问题"><a href="#Spring-IoC-循环依赖问题" class="headerlink" title="Spring IoC 循环依赖问题"></a>Spring IoC 循环依赖问题</h1><h2 id="什么是循环依赖"><a href="#什么是循环依赖" class="headerlink" title="什么是循环依赖"></a>什么是循环依赖</h2><p>循环依赖其实就是循环引用，也就是两个或者两个以上的 Bean 互相持有对方，最终形成闭环。比如 A 依赖于 B，B 依赖于 C，C 又依赖于 A。<br><img src="https://img-blog.csdnimg.cn/ebe270fd17a7440b9ce7ecd4205794eb.png"></p>
<p>循环调用其实就是一个死循环，除非有终结条件。</p>
<p>Spring 中循环依赖场景有：</p>
<ul>
<li>构造器的循环依赖（构造器注入）</li>
<li>Field 属性的循环依赖（set注入）</li>
</ul>
<p>其中，构造器的循环依赖问题无法解决，只能拋出 BeanCurrentlyInCreationException 异常，在解决属性循环依赖时，spring 采用的是提前暴露对象的方法。</p>
<h2 id="循环依赖处理机制"><a href="#循环依赖处理机制" class="headerlink" title="循环依赖处理机制"></a>循环依赖处理机制</h2><ul>
<li>单例 bean 构造器参数循环依赖（无法解决）</li>
<li>prototype 原型 bean 循环依赖（无法解决）</li>
</ul>
<p>对于原型 bean 的初始化过程中不论是通过构造器参数循环依赖还是通过 setXxx 方法产生循环依赖，Spring 都会直接报错处理。</p>
<h3 id="Spring-不支持原型-bean-的循环依赖"><a href="#Spring-不支持原型-bean-的循环依赖" class="headerlink" title="Spring 不支持原型 bean 的循环依赖"></a>Spring 不支持原型 bean 的循环依赖</h3><p>进入 AbstractBeanFactory#doGetBean 方法：<br><img src="https://img-blog.csdnimg.cn/d9bae887967a42e28ab52463fc9c1598.png"><br><img src="https://img-blog.csdnimg.cn/d12db2ec603047669e3645231da59c5e.png"></p>
<p>在获取 bean 之前如果这个原型 bean 正在被创建则直接抛出异常。原型 bean 在创建之前会标记 beanName 正在被创建，等创建结束之后会删除标记。<br><img src="https://img-blog.csdnimg.cn/0d0b8545f2a847cfae6a7b8fa2f54ba8.png"></p>
<h3 id="单例-bean-通过-setXxx-或者-Autowired-进行循环依赖"><a href="#单例-bean-通过-setXxx-或者-Autowired-进行循环依赖" class="headerlink" title="单例 bean 通过 setXxx 或者 @Autowired 进行循环依赖"></a>单例 bean 通过 setXxx 或者 @Autowired 进行循环依赖</h3><p>Spring 的循环依赖的理论依据基于 Java 的引用传递，当获得对象的引用时，对象的属性是可以延后设置的，但是构造器必须是在获取引用之前。<br>Spring 通过 setXxx 或者 @Autowired 方法解决循环依赖其实是通过提前暴露一个 ObjectFactory 对象来完成的。简单来说 ClassA 在调用构造器完成对象初始化之后，在调用 ClassA 的 setClassB 方法之前就把 ClassA 实例化的对象通过 ObjectFactory 提前暴露到 Spring 容器中。<br><img src="https://img-blog.csdnimg.cn/3aa3e44f116944ef9b10b4dd735c156a.png"></p>
<ul>
<li><p>Spring 容器初始化 ClassA 通过构造器初始化对象后提前暴露到 singletonFactories 中。<br><img src="https://img-blog.csdnimg.cn/98fdd2acd6eb40039dba9ce125635f88.png"></p>
</li>
<li><p>ClassA 调用 setClassB 方法，Spring 首先尝试从容器中获取 ClassB，此时 ClassB 不存在 Spring 容器中。</p>
</li>
<li><p>Spring 容器初始化 ClassB，同时也会将 ClassB 提前暴露到 singletonFactories 中。ClassB 调用 setClassA 方法，Spring 从 singletonFactories 中获取 ClassA，同时将 ClassA 移到 earlySingletonObjects。至此 ClassB 初始化完毕，并且保存到了单例池中。<br><img src="https://img-blog.csdnimg.cn/887f6101ac4c4ec4af115aeff051247d.png"></p>
</li>
<li><p>随着 ClassB 初始化完毕并返回给 ClassA 的创建过程中，ClassA 也完成了对象初始化操作。</p>
</li>
</ul>
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循环依赖问题</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%BB%80%E4%B9%88%E6%98%AF%E5%BE%AA%E7%8E%AF%E4%BE%9D%E8%B5%96"><span class="toc-number">1.1.</span> <span class="toc-text">什么是循环依赖</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%BE%AA%E7%8E%AF%E4%BE%9D%E8%B5%96%E5%A4%84%E7%90%86%E6%9C%BA%E5%88%B6"><span class="toc-number">1.2.</span> <span class="toc-text">循环依赖处理机制</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#Spring-%E4%B8%8D%E6%94%AF%E6%8C%81%E5%8E%9F%E5%9E%8B-bean-%E7%9A%84%E5%BE%AA%E7%8E%AF%E4%BE%9D%E8%B5%96"><span class="toc-number">1.2.1.</span> <span class="toc-text">Spring 不支持原型 bean 的循环依赖</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%8D%95%E4%BE%8B-bean-%E9%80%9A%E8%BF%87-setXxx-%E6%88%96%E8%80%85-Autowired-%E8%BF%9B%E8%A1%8C%E5%BE%AA%E7%8E%AF%E4%BE%9D%E8%B5%96"><span class="toc-number">1.2.2.</span> <span 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