Thanks everyone for your answers.
I think the problem may not be specifically with the expression I use; whatever
I put in there, it always passes. I
simplified the @Validate annotation to frame the issue and even with this it
passes:
@Validate(expression="1 == 0")
Until recently, at least, 1 is not equal to 0 ;-)
Any idea what I could be doing wrong?
Thanks,
Math
Mathieu Avoine wrote:
> Hi,
>
> I want to use annotation driven validation to validate that a property
> of type List contains at least 1 item (i.e. mylist.size() > 0).
>
> I tried using required=true, because I would have expected the behavior
> for a List object to check for the size, but it looks like it only
> validates if the property is not null (am I right?). So I turned to
> expressions, and put up this one:
>
> @ValidateNestedProperties({
> @Validate(field="selectedIds", required=true,
> on={"goToSelectVehicles","activate"}, expression="this != null &&
> this.size > 0")
> })
> private PickList keys = null;
>
> Unfortunately, it doesn't work. So, my questions:
>
> 1) What am I doing wrong?
> 2) Is there an attribute for the @Validate annotation to validate the
> size of a List?
>
> Thanks!
> Math
>
>
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