Re: JSON Serialization

[Sergey Beryozkin]

Hi
On 18/01/12 19:07, Chris Geer wrote:
I have a web service which supports both SOAP and RESTful calls which works
great except for one small issue with JSON serialization on List results.
I have two methods, one that returns a single entity and one that returns a
List of entities.

     @GET
     @Path("/parcel/{id}")
     @Consumes({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
     @Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
     public Parcel getParcel(@PathParam("id") String id) {...}

and

     @GET
     @Path("/parcels")
     @Consumes({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
     @Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
     public List<Parcel>  getParcels() {...}

When these methods are called via SOAP or Rest with XML return it all works
perfectly. When I call with JSON return it all looks decent but breaks
down. With no JSONProvider configuration the results look like this:

getParcel
     {"ns1.Parcel": {
        "ns1.ParcelID": 26,
        "ns1.Fragile": false,
        "ns1.Weight": 34
     }}

getParcels
     {"ns1.Parcel": [
       {
         "ns1.ParcelID": 1,
         "ns1.Fragile": true,
         "ns1.Weight": 100},
       {
         "ns1.ParcelID": 2,
         "ns1.Fragile": false,
         "ns1.Weight": 1000}
     ]}

Since the ns1 prefix is "random" (it's changed on me several times) I
wanted to define my own static prefix so I added a namespace map to the
JSONProvider and get these results

getParcel
     {"p.Parcel": {
        "p.ParcelID": 26,
        "p.Fragile": false,
        "p.Weight": 34
     }}

getParcels
     {"ns1.Parcel": [
       {
         "p.ParcelID": 1,
         "p.Fragile": true,
         "p.Weight": 100},
       {
         "p.ParcelID": 2,
         "p.Fragile": false,
         "p.Weight": 1000}
     ]}

The return of the single item came across as I expected (everything with a
single prefix p) but the List return still had the collection node with the
random ns1 prefix. Since that didn't work the way I wanted, I removed the
namespace map and added<property name="ignoreNamespaces" value="true"/>
and got these results

getParcel
     {"Parcel": {
        "ParcelID": 26,
        "Fragile": false,
        "Weight": 34
     }}

getParcels
     {"ns1.Parcel": [
       {"Parcel":    {
         "ParcelID": 1,
         "Fragile": true,
         "Weight": 100}},
       {"Parcel":    {
         "ParcelID": 2,
         "Fragile": false,
         "Weight": 1000}}
     ]}

Again, the single item came across fine but the List return wasn't what I
expected at all. I also tried to fool with some of the other options but
nothing I could try seemed to work. I want to get rid of the ns1 prefix on
the List wrapper element but can't figure it out.

I've got it fixed, please consider introducing a Parcels wrapper bean is 
a workaround, but either  ignoreNamespaces or setting a prefix in the 
namespaceMap will do it for the wrapper element in the next versions

Cheers, Sergey


Thanks,
Chris



--
Sergey Beryozkin

Talend Community Coders
http://coders.talend.com/

Blog: http://sberyozkin.blogspot.com