type interface mapper.usermapper is not known to the mapperregistry.

时间: 2023-04-22 08:04:20 浏览: 102

Mybatis注解学习--xxxMapper is not known to the MapperRegistry

在使用MyBatis框架进行开发时，我们可能会遇到这样的错误提示：“`xxxMapper is not known to the MapperRegistry`”。这个错误通常表示MyBatis无法找到你定义的Mapper接口，这可能是配置问题或者是类扫描的问题。下面我们将深入探讨这个问题及其解决方法。 `MapperRegistry`是MyBatis核心组件之一，它负责管理所有的Mapper接口实例。当MyBatis启动时，会扫描配置文件或注解来注册Mapper接口。如果出现上述错误，说明MyBatis在启动时没有正确地找到并注册你的Mapper接口。 1. **检查Mapper接口和XML配置文件**：确保你的Mapper接口（如`xxxMapper`）和对应的XML配置文件存在并且命名正确。在MyBatis中，一个Mapper接口对应一个XML文件，它们的名字通常是相同的，例如`XXXMapper.java`与`XXXMapper.xml`。XML文件需要放在`src/main/resources`目录下的`mybatis/mapper`或`mybatis/mappings`等子目录中。 2. **配置Mapper扫描**：在MyBatis的主配置文件`mybatis-config.xml`中，你需要指定Mapper接口所在的包名，以便MyBatis能够自动扫描并加载它们。例如： ```xml <mappers> <package name="com.example.myproject.mapper"/> </mappers> ``` 如果你的Mapper接口不在根包下，记得提供完整的包路径。 3. **检查注解配置**：如果你使用的是注解方式，那么不需要XML配置文件。但是，你需要确保在你的SqlSessionTemplate或者SqlSessionFactoryBean上启用了注解扫描，例如： ```java @Configuration public class MyBatisConfig { @Bean public SqlSessionFactory sqlSessionFactory() throws Exception { SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean(); factoryBean.setDataSource(dataSource()); // 启用注解扫描 factoryBean.setTypeAliasesPackage("com.example.myproject.entity"); return factoryBean.getObject(); } } ``` 4. **检查Mapper注解**：在Mapper接口上使用`@Mapper`注解，这告诉MyBatis这是一个Mapper接口。例如： ```java @Mapper public interface XxxMapper { // ... } ``` 5. **确保类路径正确**：确认所有相关的类和资源文件都已正确放入类路径（classpath）。如果你使用的是Maven或Gradle，确保它们被添加到正确的构建路径。 6. **重启应用**：有时候，即使配置正确，也可能因为缓存问题导致问题持续存在。尝试清理并重新构建项目，然后重启应用服务器。 7. **查看日志**：当遇到这类问题时，查看MyBatis的日志输出往往能提供关键信息。MyBatis在初始化过程中会有详细的扫描过程，通过日志可以追踪到具体是哪个Mapper接口没有被成功注册。在以上步骤中，如果你已经检查并确认了所有细节，但仍然遇到问题，可能需要进一步深入MyBatis的源码来排查问题。`MapperRegistry`类在注册Mapper时会有详细的逻辑，理解其工作原理有助于定位问题所在。如果你在解决问题过程中遇到困难，可以参考社区的资源，例如iteye博客中的“[Mybatis注解学习](https://bijian1013.iteye.com/blog/2318096)”或者其他开发者的经验分享。他们可能会提供一些额外的解决策略或者常见问题的解决方案。记住，持续学习和实践是成为优秀IT专业人士的关键。

这个错误提示意思是：mapper接口mapper.usermapper在mapper注册表中未被识别。可能是因为该接口没有被正确配置或注册。需要检查配置文件或代码中是否正确配置了该mapper接口，并且是否已经注册到mapper注册表中。

阅读全文

type interface mapper.usermapper is not known to the mapperregistry.

相关推荐

mybatis如何通过接口查找对应的mapper.xml及方法执行详解

Type interface com.mapper.UserMapper is not known to the MapperRegistry.

Type interface com.hu.mapper.UserMapper is not known to the MapperRegistry.

type interface com.itheima.mapper.usermapper is not known to the mapperregistry.

Type interface com.jane.mapper.UserMapper is not known to the MapperRegistry.

type interface com.atguigu.mybatis.mapper.usermapper is not known to the mapperregistry.

Type interface com.atguigu.mybatis.mapper.UserMapper is not known to the MapperRegistry

org.apache.ibatis.binding.BindingException: Type interface qst.mapper.UserMapper is not known to the MapperRegistry.

HTTP Status 500 - Type interface com.itheima.mapper.UserMapper is not known to the MapperRegistry.

org.apache.ibatis.binding.BindingException: Type interface org.example.mapper.UserMapper is not known to the MapperRegistry.

org.apache.ibatis.binding.BindingException: Type interface com.ll.Mapper.UserMapper is not known to the MapperRegistry.

org.apache.ibatis.binding.bindingexception: type interface com.atguigu.mybatis.mapper.usermapper is not known to the mapperregistry.

org.apache.ibatis.binding.BindingException: Type interface com.atguigu.mybatis.mapper.UserMapper is not known to the MapperRegistry.

Type interface mybatisquickstart.mapper.UserMapper is not known to the MapperRegistry出现以下错误如何解决

org.apache.ibatis.binding.BindingException: Type interface com_atguigu.mybatis.mapper.UserMapper is not known to the MapperRegistry.

Type interface com.jiexin.mapper.InsertMapper is not known to the MapperRegistry.

Exception in thread "main" org.apache.ibatis.binding.BindingException: Type interface com.wuyuzhi.mapper.UserMapper is not known to the MapperRegistry.这是什么错误？

Type interface com.book.dao.Usermapper is not known to the MapperRegistry.怎么解决

Type interface UserMapper is not known to the MapperRegistry

最新推荐

2023全球人工智能研究院观点报告：生成式人工智能对企业的影响和商业前景

2024年第三季度深圳房地产市场回顾-CBRE.pdf

【java毕业设计】springboot南皮站化验室(springboot+vue+mysql+说明文档).zip

【路径规划】基于matlab单障碍物和多障碍物的机器人避达问题仿真【Matlab仿真 7339期】.md

构建基于Django和Stripe的SaaS应用教程

管理建模和仿真的文件

R语言数据处理与GoogleVIS集成：一步步教你绘图

如何使用Matlab实现PSO优化SVM进行多输出回归预测？请提供基本流程和关键步骤。

Symfony2框架打造的RESTful问答系统icare-server

"互动学习：行动中的多样性与论文攻读经历"