springboot运行不成功，代码没有显示错误，但是运行一直不成功
网上的注释方法一直有写，但还是不能成功。各位有什么解决方法吗？
这是错误信息：
ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'bookController': Unsatisfied dependency expressed through field 'bookService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'bookServiceImpl': Unsatisfied dependency expressed through field 'bookMapper'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'bookMapper' defined in file [D:\Download\idea\l\graduation-project\target\classes\com\lin\graduationproject\mapper\BookMapper.class]: Cannot resolve reference to bean 'sqlSessionTemplate' while setting bean property 'sqlSessionTemplate'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sqlSessionTemplate' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Unsatisfied dependency expressed through method 'sqlSessionTemplate' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.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 [D:\Download\idea\l\graduation-project\target\classes\mybatis\mapper\BookMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\Download\idea\l\graduation-project\target\classes\mybatis\mapper\BookMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'Book'. Cause: java.lang.ClassNotFoundException: Cannot find class: Book
Could not resolve type alias 'Book'. Cause: java.lang.ClassNotFoundException: Cannot find class: Book
类没有找到哈，可以帮你看一下
BookMapper.xml这个配置文件中。引用Book类的时候，要用全路径类名(包名.类名)