错误
SpringBoot整合Mybatis-Plus,报错：
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [com/baomidou/mybatisplus/spring/boot/starter/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 [D:\IdeaProjects\Great-Wall-New\gwssi-bjdbc\gwssi-grant\gwssi-grant-common\target\classes\cn\gwssi\grant\common\block\dao\mapping\BlockAbnormalInfoRecordMapper.xml]'; nested exception is java.lang.NullPointerException
分析
将报错抽取出来，关键一行在于：
org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\IdeaProjects\Great-Wall-New\gwssi-bjdbc\gwssi-grant\gwssi-grant-common\target\classes\cn\gwssi\grant\common\block\dao\mapping\BlockAbnormalInfoRecordMapper.xml]';
出错的是BlockAbnormalInfoRecordMapper.xml，找到出错的接口和对应的映射文件。
经过排查发现，由于粗心，接口继承里泛型写成了 BlockAbnormalInfoRecordMapper。
解决
将泛型改成正确的实体类：
OK，问题解决。
