ClassCastException using atom-abdera binding
--------------------------------------------

                 Key: TUSCANY-2871
                 URL: https://issues.apache.org/jira/browse/TUSCANY-2871
             Project: Tuscany
          Issue Type: Bug
          Components: Java SCA ATOM Binding Extension
    Affects Versions: Java-SCA-1.4
            Reporter: Brent Daniel


If you use the atom-abdera binding with a reference that points to an RSS feed 
rather than an atom feed, you get a ClassCastException rather than a reasonable 
error. This occurs in the Tuscany feed-aggregator sample, but the exception is 
being swallowed in the java implementation.

>From FeedAggregator.composite in the feed-aggregator sample (the uri points to 
>an RSS 2.0 feed): 
<reference name="atomFeed1">
                        <tuscany:binding.atom 
uri="http://www.oreillynet.com/pub/feed/35"/>
  </reference>

The following code in AtomBindingInvoker (346-348) results in the 
ClassCastException:
     Document<Feed> doc = abderaParser.parse(new 
InputStreamReader(getMethod.getResponseBodyAsStream()));
                    parsing = true;
                    Feed feed = doc.getRoot();

doc.getRoot() returns an instance of 
org.apache.abdera.parser.stax.FOMExtensibleElement rather than Feed. 


AggregatorImpl in the feed-aggregator sample is swallowing the exception here 
(85-89):
 if (atomFeed1 != null) {
            try {
                entries.addAll(atomFeed1.getFeed().getEntries());
            } catch (Exception e) {}
        }




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