实体类未找到导致项目无法启动

报错信息

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'tbItemCatController': Unsatisfied dependency expressed through field 'tbItemCatService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'tbItemCatServiceImpl': Unsatisfied dependency expressed through field 'tbItemCatMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'tbItemCatMapper' defined in URL [jar:file:/C:/Users/lanou/IdeaProjects/taotaoparent/taotao-manager/taotao-mapper/target/taotao-mapper.jar!/com/taotao/mapper/TbItemCatMapper.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 [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: 'class path resource [mappers/TbItemParamMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'class path resource [mappers/TbItemParamMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.taotao.pojo.TbItemParmExt'. Cause: java.lang.ClassNotFoundException: Cannot find class: com.taotao.pojo.TbItemParmExt

在这里pojo表示实体类 出现这种情况的原因有很多中,在分享出来我遇到的一种

com.taotao.pojo.TbItemParmExt

注意最后这一句 我的实体类名是TbItemParamExt 少了个a 查看实体类发现没有错误 注意上边报错信息的绿色部分 进去找是不是有TbItemParamExt写成了TbItemParmExt,最后我发现是我sql mapper中返回值类型写成了TbItemParmExt.望大家引以为戒.