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<h1 id="201-210">2.0.1 升级 2.1.0指导</h1>
<h2 id="_1">服务注册发现的变化</h2>
<p>2.1.0 对服务注册发现进行了重构，提供了更好的接口 <code>Discovery</code> 和 <code>Registration</code> 方便开发者提供不同的实现。</p>
<p>在2.0.1及其之前的版本，服务中心(servicecomb-service-center)作为唯一的服务注册发现，不支持扩展，服务中心
还提供了一个本地版本的实现。具体有如下两种场景：</p>
<ul>
<li>使用服务中心： 这种场景不需要额外配置和引入依赖。</li>
<li>使用本地注册发现</li>
</ul>
<p>需要调用</p>
<pre><code> System.setProperty(LocalServiceRegistryClientImpl.LOCAL_REGISTRY_FILE_KEY, "registry.yaml");
</code></pre>
<p>启用本地注册发现，不需要额外配置依赖。</p>
<p>升级到 2.1.0 版本后， 这两种常见的使用方式调整如下：</p>
<ul>
<li>使用服务中心</li>
</ul>
<p>引入依赖</p>
<pre><code> &lt;dependency&gt;
&lt;groupId&gt;org.apache.servicecomb&lt;/groupId&gt;
&lt;artifactId&gt;registry-service-center&lt;/artifactId&gt;
&lt;/dependency&gt;
</code></pre>
<ul>
<li>使用本地注册发现</li>
</ul>
<p>引入依赖</p>
<pre><code> &lt;dependency&gt;
&lt;groupId&gt;org.apache.servicecomb&lt;/groupId&gt;
&lt;artifactId&gt;registry-local&lt;/artifactId&gt;
&lt;/dependency&gt;
</code></pre>
<p>不需要设置 <code>LOCAL_REGISTRY_FILE_KEY</code> 变量。 </p>
<p>2.1.0 需要显示的提供 pom 依赖，否则不依赖任何模块， 启动会失败。 同时引入服务中心和本地注册发现也是允许
的，可以通过配置项关闭其中的部分功能。 </p>
<pre><code class="language-yaml">servicecomb.local.registry.enabled: true
servicecomb.service.registry.enabled: true
</code></pre>
<p>详细开发指南参考<a href="../../registry/introduction.html">注册发现说明</a></p>
<h2 id="api">服务注册发现 API 的变化</h2>
<p>如果直接使用了 <code>RegistryUtils</code> 接口， 建议切换到 <code>DiscoveryManager</code> 或者 <code>RegistrationManager</code>，
尽管 <code>RegistryUtils</code> 接口仍然可以使用。 </p>
<p>如果直接使用了 <code>DiscoveryTreee</code> 接口，2.1. 将服务发现的接口移动到了 <code>org.apache.servicecomb.registry</code>，
当出现编译错误的时候，重新 import 对应的新 package 类即可。 </p>
<p>如果直接使用了 <code>ServiceRegistry</code> 接口， 2.1 将对应接口移动到了 <code>RegistrationManager</code>。</p>
<h2 id="_2">参数校验的变化</h2>
<p>参数校验失败，早期版本采用 <code>ResourceBundleMessageInterpolator</code> 来生成错误消息。 由于这个类依赖于
<code>Expression Language</code> 库，而这个库 JAVA 慢慢的不再提供支持，从 2.1.0 版本开始，切换为 <code>ParameterMessageInterpolator</code>
来生成错误消息。 然后系统删除来对于 <code>jakarta.el</code> 的依赖。 </p>
<p>开发者仍然可以继续使用<code>ResourceBundleMessageInterpolator</code> 来生成错误消息。需要额外的做下面的配置：</p>
<ul>
<li>项目中引入依赖</li>
</ul>
<pre><code class="language-xml"> &lt;dependency&gt;
&lt;groupId&gt;org.glassfish&lt;/groupId&gt;
&lt;artifactId&gt;jakarta.el&lt;/artifactId&gt;
&lt;/dependency&gt;
</code></pre>
<ul>
<li>增加配置项</li>
</ul>
<pre><code class="language-yaml">servicecomb:
filters:
validation:
useResourceBundleMessageInterpolator: true
</code></pre>
<h2 id="logger">Logger 系统的变化</h2>
<p>servicecomb 默认使用 Slf4j 记录日志，不集成具体实现，开发者可以通过引入具体的实现依赖使用不同的 Logger。
早期的版本 <code>solution-basic</code> 包含了 log4j2 的依赖， 2.1.0 移除了这部分依赖， 开发者如果通过这种方式
使用 log4j2 ， 可能需要显示的增加 log4j2 的依赖， 比如：</p>
<pre><code class="language-xml"> &lt;dependency&gt;
&lt;groupId&gt;org.apache.logging.log4j&lt;/groupId&gt;
&lt;artifactId&gt;log4j-slf4j-impl&lt;/artifactId&gt;
&lt;/dependency&gt;
&lt;dependency&gt;
&lt;groupId&gt;org.apache.logging.log4j&lt;/groupId&gt;
&lt;artifactId&gt;log4j-api&lt;/artifactId&gt;
&lt;/dependency&gt;
&lt;dependency&gt;
&lt;groupId&gt;org.apache.logging.log4j&lt;/groupId&gt;
&lt;artifactId&gt;log4j-core&lt;/artifactId&gt;
&lt;/dependency&gt;
</code></pre>
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