no mybatis mapper was found in
MyBatis includes a utility class called Resources, which contains utility methods to make it easier to load resource files from Classpaths or other locations. I have solved it by adding all components to the Spring facet.
To learn more, see our tips on writing great answers. For example: In the example mentioned above, a statement can be defined either by XML or by annotations. So,how to solve this problem? Why do `Left` and `Right` have two type parameters? The trick is that you need to have enabled the Spring Data plugin. Mybatis How to map a column from another table to a String list? Finding zero cross of AC signal digitally.
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2017) you have to enable the Spring Data plugin and then you don't need any of the above workarounds. org.mybatis.spring.mapper.ClassPathMapperScanner - No MyBatis mapper was found in '[com.aaa.bbb]' package. invokeBeanFactoryPostProcessors:95, PostProcessorRegistrationDelegate (org.springframework.context.support) What are "non-Keplerian" orbits?
The annotations are not XML, For specific use, two things need to be configured: one is SqlSessionFactory, which is used to create a SqlSession Factory, and SqlSession is used to dock with the database; the other is the Mapper interface of the data Mapper, 1.
In previous versions of MyBatis, the role of the namespace was not significant and was optional. – ave Aug 15 '19 at 18:34
3)没有实现任何的优先级接口的, 我们的 MapperScannerConfigurer 就是第3类 没有实现任何的优先级接口的，而 MapperScannerRegistrarNotFoundConfiguration 上的 @Configuration 对应的 BeanDefinitionRegistryPostProcessor 是 ConfigurationClassPostProcessor这个类是实现了 PriorityOrdered接口，因此先解析，放张源码解析位置的对比图, spring 在 处理 MapperScannerRegistrarNotFoundConfiguration 这个配置类时，根据其类上的条件注解决定是否导入 AutoConfiguredMapperScannerRegistrar ，AutoConfiguredMapperScannerRegistrar 类 是 ImportBeanDefinitionRegistrar 接口的实现类，在调用 registerBeanDefinitions 时执行扫描，发现没有 mapper 时，执行警告, 为啥 MapperScannerRegistrarNotFoundConfiguration 生效，是因为解析 MapperScannerRegistrarNotFoundConfiguration 时 容器内确实没有 MapperFactoryBean，没有的原因是 我们配置的 @MapperScan 对应的 BeanDefinitionRegistryPostProcessor 在 @Configuration 对应的 BeanDefinitionRegistryPostProcessor 后面解析，因此相当于 解析 MapperScannerRegistrarNotFoundConfiguration 时，@MapperScan 还未生效, 这种解决方案就多了，就以我自身上面环境 SpringBoot2.2.5+MyBatisPlus3.3.1+PageHelper1.2.10 碰到的问题举例,其他版本问题可参考解决, 高版本的 PageHelper 使用的是高版本的 mybatis-spring-boot-starter 即高版本的MybatisPlusAutoConfiguration ，通过上面的分析应当是可以解决警告问题的, 可以看到 高版本的 MybatisPlusAutoConfiguration 的内部类 MapperScannerRegistrarNotFoundConfiguration 配置的条件注解 多了一个 MapperScannerConfigurer.class, 在 解析 MapperScannerRegistrarNotFoundConfiguration 的条件注解时，可以找到 MapperScannerConfigurer，因此 MapperScannerRegistrarNotFoundConfiguration 配置不会生效, org.springframework.boot.autoconfigure.condition.OnBeanCondition#getMatchOutcome, 本身我是只打算排除就行的，我认为 mybatisplus应该已经有了依赖后来发现没有。。。, MapperScannerRegistrarNotFoundConfiguration 的条件注解为 @ConditionalOnMissingBean(MapperFactoryBean.class),使条件注解不成立即可, mybatis-spring 降级至 2.0.0版本后，在启动时，spring 在解析时，启动类是优先于 MapperScannerRegistrarNotFoundConfiguration, org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader#loadBeanDefinitions, doScan:155, ClassPathMapperScanner (org.mybatis.spring.mapper)
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