grails中自定义hql传参类型为实体所包含枚举类型问题

grails编写自定义hql进行传参这个枚举类型时会报类型转换异常
String hql = "hql"
def arg = [
        "arg": Enum.valueOf(枚举类.class, 参数.trim())
]
result = 实体类.executeQuery(hql,arg)