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From Sergey Beryozkin <>
Subject Re: XSLTJaxbProvider and json
Date Tue, 26 Jul 2011 01:29:47 GMT

On Tue, Jul 26, 2011 at 12:57 AM, rbinion <> wrote:
> I'm looking for suggestions on how best to approach a problem.
> I'm currently working on a project where we are using CXF to expose REST
> services which will be consumed both by direct service consumers as well as
> a co-developed spring MVC/javascript based application.
> I suspect that we are doing fairly typical stuff in that we are annotating
> our services to produce both xml and json (driven by jaxb annotations), and
> this is working fine for simple marshaling. However I now have the need to
> also handle some fairly simple transformations (omitting and renaming
> elements) both coming in and out of a particular service.
> The reason for the transformation is that I essentially have a POJO that
> represents somewhat of a "union of types", and I have no compelling reason
> to realize this "union" as a class hierarchy, other than to make the service
> interface "clean" (the underlying business service prefers to operate on
> this "union" as does the data access layer). More or less, I am trying to
> avoid creating DTOs, or rather I am attempting to realize the DTO's only
> through XML transformation.
> So, I would like to provide a simple set of rules (xslt) to do the
> transformation for both XML and json output, but that is where I am not
> conceptualizing the simple solution. XSLTJaxbProvider seems to be very close
> to what I want (and indeed I have been able to get this to work for
> marshaling XML), but I'm not sure how to extend this approach to also work
> for JSON transformations without having to write two XSLT's (one for
> handling XML and the other for handling json).
> Am I thinking about the problem wrong, i.e. two templates is the way to
> handle this (regardless of the maintenance overhead), and/or I should just
> stop being lazy and implement the darn POJO's (again irrespective of the
> maintenance overhead) ...
> If I am on the right track but some sample code would be helpful in seeing
> where I am going astray, I can provide that as well ...
I think you are on the right track. The only complication with
XSLTJaxbProvider and a dedicated template producing JSON is that
this template will need to deal with creating a JSON sequence itself.
I think it would be nice to get a similar XSLTJsonProvider which would
create a
writer sitting between JAXB and Jettison and that would basically
enable reusing the same single template for producing XML & JSON
transformed output. Please feel free to create an enhancement request
- and a patch would help :-)
The other option is to try TransformFeature: it will work for both XML
and JSON (JAXB-driven):

Cheers, Sergey

> Any suggestions/revelations would be greatly appreciated.
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Sergey Beryozkin
Talend -

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