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From "Sergey Beryozkin" <sbery...@progress.com>
Subject RE: JAX-RS Request Matching Wierdness
Date Sun, 12 Jul 2009 19:20:16 GMT
Hi Gary

The thing is that JAX-RS does not allow for checking on the multiple
root resource classes - I think there was a discussion on cxf users list
about extending the selection algorithm - I don't mind if it would
actually make things simpler.

Please see few more comments prefixed with S.B below. Particularly I
don't understand why the use of subresources affects the complexity of
response objects

Thanks, Sergey

-----Original Message-----
From: Tong, Gary [mailto:Gary.Tong@morganstanley.com] 
Sent: 12 July 2009 11:52
To: dev@cxf.apache.org
Subject: RE: JAX-RS Request Matching Wierdness

Hi Sergey,

The problems come up in a number of situations, all involving multiple
service beans.  The simplest case is the following:

public class AWebService {
  @GET
  @Path("/a")
  public String a() {
    return "a";
  }
}

public class BWebService {
  @GET
  @Path("/b")
  public String b() {
    return "b";
  }
}

One of the two will work, but not both.

This is of course the simplest case, but there are a number of other
more concrete use cases that cause issues.  For instance, if I had the
following URLs:

GET /user
POST /user
GET /user/search?params

And I wanted to put the CRUD ops on UserWebService but the search stuff
on a SearchWebService that uses @Path("/{type}/search") then that
wouldn't work in CXF.  

> S.B :
Try 

@Path("/user")
public class UserService {}

@Path("/user/")
public class SearchService {}

> S.B : - note the trailing '/' in SearchService. It might do the trick
in other cases too


Also, for instance if I had the following urls:

GET /posts
GET /user
GET /user/{id}/posts

/posts would go on PostWebService and /user would go on UserWebService,
but if I wanted PostWebService to handle /user/{id}/posts as just a
specialized version of /posts that would be tricky with CXF.  It's
doable with sub-resource locators, but then my response objects start
getting complicated.

> S.B : I'm not quite sure why the use of subresources affects the
complexity of the response objects. Can you give an example please ?

Thanks,
Gary

-----Original Message-----
From: Sergey Beryozkin [mailto:sberyozk@progress.com] 
Sent: 11 July 2009 21:28
To: dev@cxf.apache.org
Subject: RE: JAX-RS Request Matching Wierdness

Hi Gary

So what is the concrete problem you're facing ?

FYI, it is the map that sorts resource classes according a number of
criteria. Another thing is that the JAX-RS selection algorithm does not
have be implemented literally the way it's documented in the spec,
rather the final result should be correct.

So let me know please what exactly is happening in your case

Thanks, Sergey     

-----Original Message-----
From: Tong, Gary [mailto:Gary.Tong@morganstanley.com]
Sent: 11 July 2009 16:57
To: dev@cxf.apache.org
Subject: JAX-RS Request Matching Wierdness

Hello,

Hey guys, just fyi, CXF's jax-rs doesn't do request matching correctly.
According to JSR 311 in section 3.7.2, the jax-rs server is supposed to
apply a series of steps to determine which URL to use for the request.
Instead, CXF applies a path filter at the class level, and then returns
the first entry it finds.  Specifically the code that does this is in
JAXRSUtils.selectResourceClass:

        if (!candidateList.isEmpty()) {
            Map.Entry<ClassResourceInfo, MultivaluedMap<String, String>>
firstEntry =
                candidateList.entrySet().iterator().next();
            values.putAll(firstEntry.getValue());
            return firstEntry.getKey();
        }


Not sure if you guys know about this.

Cheers,
Gary

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