In an action class, I have a List
something like the following.
private List<SomeEntity>entity=new ArrayList<SomeEntity>();
public List<SomeEntity> getEntity()
{
this.entity=someService.getList(); //Initialize after some ugly conditional checks, lazy loading.
return this.entity;
}
//Setter is not required in this case.
I need to initialize it at the declaration place for some reason.
Since this List
is not null
(and in fact, it can never be null
, in this case), in an action method, a validator like the following,
@Validations(
requiredFields={
@RequiredFieldValidator(fieldName="entity", type=ValidatorType.FIELD, key="key.required")})
public String doAction()
{
return ActionSupport.SUCCESS;
}
will not work (I expect a validation error to occur here, since the list does not contain any object(s), its size is zero).
So, how to validate this field entity
, if its size zero?
I use Struts 2.3.16.