a workaround to this problem is to have a string field in the Action
class to represent MyPojo.integer. using this approach, the second set
of validation rules below work 100% and i no longer see the
NoSuchMethodException. however, the drawback is that now i have to
transfer this to my backing bean.
oh well, you win some, you lose some. if anyone has a better idea,
please let me know.
thanks.
On Mon, Jul 12, 2010 at 11:26 AM, Jake Vang <vangj...@googlemail.com> wrote:
> hi,
>
> i am trying to validate an integer field (int primitive type) on a
> POJO (i.e. MyPojo.integer). i have the validation defined in
> <ActionClass>-<alias>-validation.xml as follows.
>
> ...
> <field name="myPojo.integer">
> <field-validator type="required">
> <message>Integer is required!</message>
> </field-validator>
> </field>
> ...
>
> when the form posts to the action, if the value of <s:textfield
> name="myPojo.integer"/> is left blank, i keep seeing a
> java.lang.NoSuchMethodException:
> MyPojo.setInteger([Ljava.lang.String;). why is struts trying to insert
> a string into this int field? the field value is "blank" (empty), so
> i'd expect struts to be smart enough to see this and not try to insert
> anything and just return back to the form with the validation error.
>
> it should be very easy to define the following validation rules:
> 1. myPojo.integer is required
> 2. myPojo.integer is an integer
>
> however, it is NOT that easy. here's a set of validation rules that i
> tried and did not succeed.
>
> <field name="myPojo.integer">
> <!-- this says myPojo.integer is required -->
> <field-validator type="required">
> <message>Integer is required!</message>
> </field-validator>
> <!-- this says myPojo has to be a positive integer -->
> <field-validator type="regex">
> <param name="expression"><![CDATA[^\d+$]]></param>
> <message>Please enter an integer!</message>
> </field-validator>
> </field>
>
> when i use this set of validation rules, i also observe the same
> NoSuchMethodException. this time, however, i do NOT see that the
> validation works (because I do not see the message, Integer is
> required!).
>
> something like the following works, but STILL, i see the
> NoSuchMethodException thrown if the field's value is left blank.
> ...
> <field-validator type="int">
> <param name="min">1</param>
> <param name="max">10</param>
> <message>Integer must be between ${min} and ${max}, current value is
> ${myPojo.integer}.</message>
> </field-validator>
> ...
>
> however, this last validation rule is absolutely the WORST one to use
> because if the value on the form is left blank, 1) i will see the
> NoSuchMethoException thrown and 2) if i allow for min=0 and max=10,
> the validation will never know if the user entered 0 or was the 0
> because there was no value!
>
> any ideas is appreciated. i already experimented a lot and did not
> come up with anything that is why this post is rather long.
>
> thanks.
>
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