Hi.
I have the following JAX-RS resource class:
@Path("user")
public class UserResource {
private final UserHandler m_userHandler =
Program.Injector.getInstance(UserHandler.class);
@GET
@Path("{id}")
public User getUser(@PathParam("id") int id) {
User user = m_userHandler.get(id);
if (user == null) {
throw new WebApplicationException(Response.Status.NOT_FOUND);
}
return user;
}
}
I am using neither the @Consumes nor the @Produces annotation, because I do not
want to limit the User resource to a predefined set of representations. On the
other hand, I have no problem to declare supported media type writers somewhere
in a resource agnostic place, although I have no idea where.
Anyway, when I am trying to GET the resource at http://localhost/user/1, I get
back this:
30 nov. 2011 00:55:00 org.restlet.ext.jaxrs.internal.util.ExceptionHandler
noMessageBodyWriter
ATTENTION: No message body writer found for class class com.shunra.poc.User,
genericType class com.shunra.poc.User; response media type should be:
text/html; accepted media types are: [[text/html, application/xhtml+xml,
application/xml, */*]]
The flow goes like this:
1. Firefox sends Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
2. JaxRsProviders.writerSubSet discovers the following suitable media writers -
[org.restlet.ext.jaxrs.internal.provider.JaxbProvider,
org.restlet.ext.jaxrs.internal.provider.ConverterProvider,
org.restlet.ext.jaxrs.internal.provider.JsonProvider]
3. JaxRsRestlet.determineMediaType translates the result of
JaxRsProviders.writerSubSet into [application/xml, text/xml, application/*+xml,
application/json, */*]
4. Next JaxRsRestlet.determineMediaType merges the list of acceptable media
types [[text/html, application/xhtml+xml, application/xml, */*]] with
[application/xml, text/xml, application/*+xml, application/json, */*] to yield
[text/html, application/xhtml+xml, application/xhtml+xml, application/xml,
application/xml, application/xml, application/xml, text/xml, application/*+xml,
application/json, */*]
5. Then JaxRsRestlet.determineMediaType returns the first concrete media type
from the merged list, which is text/html
6. MessageBodyWriterSubSet.getBestWriter tries to cross reference the list of
suitable providers [org.restlet.ext.jaxrs.internal.provider.JaxbProvider,
org.restlet.ext.jaxrs.internal.provider.ConverterProvider,
org.restlet.ext.jaxrs.internal.provider.JsonProvider] with text/html, but none
of them supports it and so it returns null.
7. The aforementioned exception is thrown.
I think this flow is wrong. Choosing text/html ultimately fails the request,
but if the code had tried picking the next after it - application/xhtml+xml,
then the request would have succeeded.
Please advice on how to deal with this issue without annotating the resource
handler method with @Consumes or @Provides.
Thanks.
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