Re: JSON Request Validation - duplicate elements

Thu, 12 Jul 2012 07:23:21 -0700 

Hi
On 11/07/12 06:48, S K wrote:

Hello,
I have a REST service which supports JSON requests. When an element of the
JSON object contains more than one of the same elements (e.g. "a") and the
element is not defined as a collection, the last element found in the
request is set to the instance of the annotated bean for that element and
the first one is ignored/overwritten. The schema validation does not catch
this is it would for an equivalent XML request. For example, below "a" is
an element which is defined once in the annotated class but when it appears
more than once in the request, "a" will be set to 2. Is there a way I can
have my service recognize this JSON request contains more than one "a"
element, which is not allowed before allowing the request to continue? The
requests are being validated by an XSD. I'm using CXF 2.6.1.

{
   "SomeRequest": {
     "a":1,
     "a":2,
     "b":2
}}


this is how the field is defined in the request class SomeRequest
@XmlElement(name = "a" , required=true)
private Long a;



Schema element defined as:
<xs:element name="a" type="xs:long"/>
The problem was in Jettison which I've just fixed. Jettison can not stream at the moment so the values having identical keys were simply overwritten. So the good news is that Jettison 1.3.2 will have this issue fixed.
The possible workaround is to extend JSONProvider and wrap the reader it creates with the custom reader which will do its own enforcement, example, it will block the payloads which will have more than one 'a' element... 

thanks, Sergey



Thanks!
Steve

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