field-validator type="date" works fine but got ognl.MethodFailedException

[heng zhang]

Hi all
i am using field-validator type="date" to validate the birth date field in my form.
in my action, i declared the birthday variable as

java.util.Date birthday= null;

and the getter and setter method

       public Date getBirthday() {
		return birthday;
	}


	public void setBirthday(Date birthday) {
		birthday = birthday;
	}
    

everything seems normal and i do it like the many examples of date validator.

the jsp has the s:textfield of birthday

<s:textfield name="birthday" value="" id="birthday"/>

everything works fine. but i always get the exception:

ognl.MethodFailedException: Method "setBirthday" failed for object xxxxxxx@b6421 [java.lang.NoSuchMethodException: xxxxxx.setBirthday([Ljava.lang.String;)]

i know that struts 2 parses birthday as a String, but i created birthday as a Date ,which caused this exception.
but i created birthday as a Date for the purpose of using date validator.

how can i get ride of this exception.

Thanks
Heng