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https://issues.apache.org/jira/browse/WINK-218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12768230#action_12768230
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Kaloyan Kolev commented on WINK-218:
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{quote}
Not exactly. The GenericEntity is used to represent a response entity of a
generic type.
For example, if there is a provider that accepts List of a specific type, the
GenericEntity will be the solution.
{quote}
Yes this is the reason why I thought that if there is a provider that is able
to serialize a AtomEntry then it will be able to serialize a derivative class
by using the generic type.
{quote}
In your case, the JAXBXmlProvider doesn't expect to handle any specific generic
types, but only supported raw types. Therefore, it cannot find a provider since
raw type is XAtomEntity and it doesn't have any JAXB annotations.
{quote}
What is the reason for this provider to not be able to handle any objects of
known generic types? After all the XAtomEntry is an instance of AtomEntry, so I
don't see why this won't work always.
I checked the specification and it does not enforce such obligation on the
providers so I agree it is not a bug (as I was assuming) but probably an
enhancement request. Do you think I should close this and open a feature
request?
Thanks.
> GenericEntity's generic type is not used when choosing provider.
> ----------------------------------------------------------------
>
> Key: WINK-218
> URL: https://issues.apache.org/jira/browse/WINK-218
> Project: Wink
> Issue Type: Bug
> Components: Common
> Affects Versions: 0.2
> Reporter: Kaloyan Kolev
>
> I have created a subclass of the AtomEntry, let's say XAtomEntry. When I
> return that as an entity resource I get exception that there is no provider
> for that type. The exception is thrown by FlushResultHandler. I tried to wrap
> the new type in a GenericEntity with a generic type set to AtomEntry, but the
> result was the same.
> Here is the check for the GenericEntity:
> {code}
> Class<?> rawType = null;
> if (entity instanceof GenericEntity) {
> GenericEntity<?> genericEntity = (GenericEntity<?>)entity;
> entity = genericEntity.getEntity(); // this is the XAtomEntity
> instance
> rawType = genericEntity.getRawType(); // this is the XAtomEntity
> class
> genericType = genericEntity.getType(); // this is the AtomEntity
> class
> } else {
> rawType = (entity != null ? entity.getClass() : null);
> if (isOriginalEntityResponseObj) {
> genericType = rawType;
> } else {
> genericType = (genericType != null ? genericType : rawType);
> }
> }
> {code}
> This should match the default JAXBXmlProvider, right?
> Later a provider is searched for:
> {code}
> // get the provider to write the entity
> Providers providers = context.getProviders();
> MessageBodyWriter<Object> messageBodyWriter =
> (MessageBodyWriter<Object>)providers.getMessageBodyWriter(rawType,
>
> genericType,
>
> declaredAnnotations,
>
> responseMediaType);
> {code}
> Here the messageBodyWriter is set to null.
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