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

用mybatis查询时，传入一个字符串传参数，且进行判断时，会报 

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

<choose><when test="xxx!= null and xxxx!=''">WHERE VEHICLE_INCIDENTALS_ID = #{xxxx}</when><otherwise>WHERE VEHICLE_INCIDENTALS_ID = ''</otherwise></choose>

后来修改下如得以解决：

<choose><when test="_parameter != null and _parameter !=''">WHERE VEHICLE_INCIDENTALS_ID = #{_parameter}</when><otherwise>WHERE VEHICLE_INCIDENTALS_ID = ''</otherwise></choose>

总之：不管你的参数是什么，都要改成"_parameter"