Hi,
On Jul 15, 2009, at 11:53 AM, tarjei wrote:
> Hi,
>
> Is there an exception free way to use WebResource?
>
> I'm asking because I think that having to catch an exception to
> check for a 404 when fetching an entity is too verbose.
>
> It would be nice to either have a version of WebResource where it
> would be possible to check return codes or where exceptions are
> thrown for exceptional things like 500 codes.
>
> Something like:
>
> ret = webresource.path("/").get(SomeEntitiy.class);
>
> if (ret == null) // resource returned 404
> doSomething();
> else
> doSomethingElse();
>
You can do:
try {
...
} catch (UniformInterfaceException ex) {
ClientResponse cr = ex.getResponse();
if (cr.getStatus() == 404) { ... }
}
> Also, when doing a create, how do I get the location uri of the new
> object?
>
> SourceView sv2 = webResource.path("source").accept("application/
> xml").put(SourceView.class, sv);
>
> Ok, I now got the object, but I do not know the URI of the object.
>
You can do:
ClientResponse cr = webResource...put(ClientResponse.class, sv);
if (cr.getStatus() == 201) {
URI u = cr.getLocation();
SourceView sv = cr.getEntity(SourceView.class);
}
However, there is a slight inconsistency in that returning a
ClientResponse will not result in a UniformInterfaceException
exception being throw for status codes >=300. You can rectify this by
adding a client filter that supports such behavior.
If only Java could return multiple values and the types of those could
be reflected on a runtime, then it would be easier to define the tuple
of entity and location.
It is hard to specify a generic solution like returning
Created<SourceView> because it is not easy for the developer to
declare references to Java types. But it should be possible to define
a message body reader for a type Created, from which the entity can be
obtained from getEntity. If the status code is not 201 a
UniformInterfaceException can be thrown.
Paul.
> One option would be to have the methods be able to return a response
> object:
>
> Response r = webResource.path("source").accept("application/
> xml").put(SourceView.class, sv);
>
> if (r.getStatus() == 204) {
> ...
> }
>
>
> This is a very typical REST client problem I think.
>
> A HTTP response often contains more than just the entity you
> requested - how this information should be delivered to the client
> in a clear way is not always clear.
>
> Any ideas?
>
> Regards,
> Tarjei
>
>
> --
> Tarjei Huse
> Mobil: 920 63 413
>
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