Hi Chris,
thank you very much for the reply. What I tried to do is to return a
List<SomeObject>.
Jersey can translate List<SomeObjectt> to JSON representation without
problem. However, for XML representation, there is a runtime exception:
com.sun.jersey.api.MessageException: A message body writer for Java
class java.util.LinkedList, and Java type class java.util.LinkedList,
and MIME media type application/xml was not found
I am wondering, whether I should write a special MessageBodyWritter for
the List<SomeObject>.
Regards
Pengfei
On 03/14/2011 01:41 PM, Christopher Piggott wrote:
> On Mon, Mar 14, 2011 at 5:58 AM, Pengfei Di<pengfei.di_at_match2blue.com> wrote:
>> Is it possible to return List<String> at all? If yes, how can I write the
>> message body writer for it?
> When you return List<SomeObject> with an XML or JSON representation
> it's pretty apparent how jersey can take that single object and put it
> into a list. It builds a wrapper around it, by pluralizing
> SomeObject, something like:
>
> <SomeObjects>
> <SomeObject> ...</SomeObject>
> <SomeObject> ...</SomeObject>
> </SomeObjects>
>
> You can still pick out the individual objects - they have a beginning
> and an end.
>
> If you sent back a list of Strings, in some representation that you
> create yourself, said representation would have to have some way to
> determine where each individual string starts and stops. In the
> totally generic case you couldn't use \n because strings can have \n
> in them. I don't think it would be entirely unreasonable for you to
> create a message body writer that takes each individual string and
> encodes it to convert (at least) newlines to some other character
> sequence, then a MessageBodyReader at the other end to convert it
> back.
>
> But my gut feeling is that you'd be better off making a jaxb object
> ListOfStrings with an element List<String> in it, and let jaxb (or
> similar) worry about how to encode (with escapes) said string. But,
> doing it yourself is not a totally crazy idea, especially if you don't
> already have jaxb etc. in your application.
>
> --Chris
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Pengfei Di
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