Spring MVC defaultValue for Double
- by mlathe
Hi All,
I'm trying to build a controller like this:
@RequestMapping(method = {RequestMethod.GET}, value = "/users/detail/activities.do")
public View foo(@RequestParam(value = "userCash", defaultValue="0.0") Double userCash)
{
System.out.println("foo userCash=" + userCash);
}
This works fine:
http://localhost/app/users/detail/activities.do?userCash=123&
but in this one userCash==null despite the default value
http://localhost/app/users/detail/activities.do?userCash=&
From some digging it seems like the first one works b/c of a Editor binding like this:
binder.registerCustomEditor(Double.class, new CustomNumberEditor(Double.class, false));
The trouble is that the second param (ie false) defines whether blank values are allowed. If i set that to true, than the system considers the blank input as valid so i get a null Double class.
If i set it to false then the system chokes on the blank input string with:
org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'double'; nested exception is java.lang.NumberFormatException: empty String
Does anyone know how to get the defaultValue to work for Doubles?
Thanks
--Matthias
