异常:
java.lang.RuntimeException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'books'. Cause: java.lang.ClassNotFoundException: Cannot find class: books
解决方法: 在applicationContext.xml 配置Mybatis工厂未引入核心配置文件mybatis-config.xml。