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

1  mapping：把#{xxx}修改为 #{_parameter}

<select id="getSessionZzjgTreeDetail" resultMap="zzjgTreeMap">
	SELECT id,zzjgjc,PARENT_ID,0 as checked,shortdm FROM T_SYS_ZZJG
	<if test="_parameter != null and _parameter !=''">
		CONNECT BY PRIOR ZZJGDM=PARENT_ID START WITH PARENT_ID= #{_parameter} 
	</if>
	order by SHOW_INDEX asc
</select>

2  在方法中定义

public List<BaseTree>  getSessionZzjgTreeDetail(@Param(value="PARENT_ID") String PARENT_ID ){

　　...

}