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From "Sergey Beryozkin" <>
Subject Re: Aegis versus jaxrs
Date Tue, 21 Oct 2008 13:00:03 GMT

> The abstract providers (JAXB and Aegis) are declared as subclasses of
> MessageBodyReader<Object>, not MessageBodyReader<T>. That in turn
> forces the parameter to be readFrom(Class<Object> type, ...), which
> requires the input to be the one and only  Object.class object.

Extending from MessageBodyReader<T> ? What does it mean ? Creating a provider per every
individual type ?
I'm not a generics guru but it does not make any sense to me.

> I don't see how you can assert that JAXB works when there are no tests
> that call it. I put a breakpoint on JAXBElementReader.readFrom, and I
> ran all the JAX-RS unit tests and the systest, and it never got hit.


> I'm pretty sure that on the read side JAXB needs some root classes,
> just like Aegis, and you're not giving it any in the code you have.
> Please send along a reference to the JAX-RS spec that specifies
> MessageBodyReader. Perhaps that will reveal what I'm missing.
> If you look at the that I checked in, the
> @Ignored read test fails because I can't pass the actual bean class to
> the readFrom interface. My friendly challenge to you is this: Create
> the JAXB equivalent of this test.

Ok :-).

> On Tue, Oct 21, 2008 at 7:36 AM, Sergey Beryozkin
> <> wrote:
>> Hi,
>>> I'm getting into trouble here now that I'm debugging a test case.
>>> readFrom takes Class<Object>, not Class<?>. I don't see how the JAXB
>>> code could work, as it will try to obtain a type for 'Object.class',
>> Unfortunately Class<?> does not compile. Plain Class is passed in to it from
>> above and it has all the info. Somehow JAXB is capabe of finding out what
>> the class contains. Likewise in isReadable/isWriteable we can check if
>> ObjectFactory is available and we can obtain it in readFrom()/writeTo even
>> if Class<Object> is passed in.
>> What sort of code won't work for you ?
>> Thanks, Sergey
>>> which is the only thing in the world of type Class<Object>, AFAIK. My
>>> code certainly won't work. I note that none of your unit tests ever
>>> call the JAXB Element readFrom. I'll look for the systest. Aegis needs
>>> some clue about what types are going to be read.

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