Mybatis-Plus Error creating bean with name ‘userServiceImpl‘: Unsatisfied dependency expressed

错误:Error creating bean with name 'userServiceImpl': Unsatisfied dependency expressed through field 'baseMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mapperUser' defined in file [E:\Friends\mybatisPuls\target\classes\com\example\mybatispuls\Mapper\MapperUser.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [com/baomidou/mybatisplus/autoconfigure/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [E:\Friends\mybatisPuls\target\classes\mapper\MapperUser.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [E:\Friends\mybatisPuls\target\classes\mapper\MapperUser.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'User'. Cause: java.lang.ClassNotFoundException: Cannot find class: User

在写自定义分页测试的时候报错

1、以为在创建Service接口和实现类userServiceImpl出问题

2、UserMapper.xml自定义分页中编写SQL 自定义方法名或者 resultType出问题

3、使用MyBatis-Plus代码生成器生成代码，没有@Mapper注释，添加注释后OK。

FastAutoGenerator.create("url","username","password").globalConfig(builder ->{
        builder.author("baomidou")// 设置作者.enableSwagger()// 开启 swagger 模式.fileOverride()// 覆盖已生成文件.outputDir("D://");// 指定输出目录}).packageConfig(builder ->{
        builder.parent("com.baomidou.mybatisplus.samples.generator")// 设置父包名.moduleName("system")// 设置父包模块名.pathInfo(Collections.singletonMap(OutputFile.xml,"D://"));// 设置mapperXml生成路径}).strategyConfig(builder ->{
        builder.addInclude("t_simple")// 设置需要生成的表名.addTablePrefix("t_","c_");// 设置过滤表前缀}).templateEngine(newFreemarkerTemplateEngine())// 使用Freemarker引擎模板，默认的是Velocity引擎模板.execute();

检查上诉问题都ok的，发现是.yml文件配置类型别名配置到configuration中的子级；最后重新配置.yml