以下为错误信息：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'com.xxx.SpringbootSsmApplicationTests': Unsatisfied dependency expressed through field 'bookDao'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.xxx.dao.xxxDao' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
 

 相应的配置引用：

<properties>
    <java.version>1.8</java.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <spring-boot.version>2.6.13</spring-boot.version>
</properties>
<dependencies>
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>2.2.2</version>
    </dependency>
</dependencies>

解决方案：

引导类上添加@MapperScan注解

示例：

@SpringBootApplication
@MapperScan("com.xxx.dao")
public class SpringbootSsmApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootSsmApplication.class, args);
    }
}