That did the trick, and works. Thanks!
Zoltan
Marc Hadley wrote:
> This is a problem with type erasure[1]. When using Response with a
> generic type as the entity (List<EntityName> in this case) you need to
> capture the generic entity type using GenericEntity like this:
>
> List<EntityName> list = entityA.getBEntities();
> GenericEntity<List<EntityName>> entity = new
> GenericEntity<List<EntityName>>(list) {};
> return Respones.ok(entity).build();
>
> Without this the runtime cannot know that you are returning a list of
> EntityName so it can't work out how to serialize it.
>
> Marc.
>
> [1] http://java.sun.com/docs/books/tutorial/java/generics/erasure.html
>
> On Oct 7, 2009, at 8:38 AM, Zoltan Arnold NAGY wrote:
>
>> Hey all,
>>
>> This might have been asked earlier, but google didn't help me out. I
>> might have missed
>> a keyword.. :)
>>
>> I'm trying to return a list of entities coming from a JPA entity. As
>> far as I do it this
>> way:
>>
>> @GET
>> @Produces("application/json")
>> public List<EntityName> get() {
>> // look up entityA
>> return entityA.getBEntities();
>> }
>>
>> it works fine. However, I wanted to introduce
>> error handling (return a 404 using Response.status(404).build()
>> on a specified exception), so I changed the code:
>>
>> @GET
>> @Produces("applicatoin/json")
>> public Response get() {
>> // do the same, but
>> return Respones.ok(entityA.getBEntities()).build();
>> }
>>
>> this way I always get an exception, namely:
>>
>> [java] SEVERE: A message body writer for Java type, class
>> org.eclipse.persistence.indirection.IndirectList, and MIME media
>> type, application/json, was not found
>>
>>
>> I guess in the first case, JAXB somehow wraps my data, and in the
>> latter it can't for one reason or another.
>> Is there a way I could mimic the same behaviour?
>>
>> Thanks,
>> Zoltan
>>
>>
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>>
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>>
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>>
>>
>>
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