org.apache.ibatis.reflection.ReflectionException: There is no getter for property named '' in class

org.apache.ibatis.reflection.ReflectionException: There is no getter for property named 'purchase' in 'class share.pmc.modular.pm.entity.Purchase'

报错文件为mapper.xml文件，表面看上去是没有purchase字段没有get方法，但是我看了一下是有的，那么问题还是在mapper文件上，仔细看了下，原因为：resultMap写错了