There is no getter for property named 'XXX' in 'class java.lang.String'

question:

There is no getter for property named 'XXX' in 'class java.lang.String'

method:

Defined in advance in the dao.java layer

DataSubject getSubjectByFileName(@Param(value="XXX") String XXX);

Keep parameters consistent in dao.xml

<select id="" resultType="DataSubject" parameterType="string">
        select * from tb a where a.name = #{XXX}
</select>