Unsatisfied dependency expressed through field 'userDetailsService';

根据提供的引用内容，Unsatisfied dependency expressed through field 'userDetailsService'错误是由于在使用@Autowrited注解时，没有找到'UserMapper'类型的bean导致的。

可能的原因是没有正确配置'UserMapper'的bean。您可以检查以下几个方面来解决这个问题：

1. 确保在pom.xml文件中正确引入了'mysql-connector-java'依赖，并且版本为5.1.49。

2. 检查applicationContext-datasource.xml文件中是否正确配置了数据源，并且driverClassName为com.mysql.cj.jdbc.Driver。

3. 确保在UserMapper类上添加了@Component或@Repository注解，以将其声明为一个bean。

如果您已经检查了上述步骤，并且仍然遇到问题，您可以尝试重新编译和构建项目，或者检查其他可能导致依赖问题的代码部分。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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