I have started to implement the invokers at binding-gdata module. Maybe, the
simplest operation is retrieve a feed from an specific URI. So, I have
chosen the getFeed() method as the first one to be implemented.
Trying to think as simple as possible, and using the gdata java client, the
method follow these steps:
1) Set the user credentials;
2) Get the feed at an URI as a com.google.gdata.data.Feed object;
3) Pass the feed object to the body of the message object
(org.apache.tuscany.sca.invocation.Message);
The following piece of code demonstrate it:
*
//FIXME - Get credentials automatically
myService.setUserCredentials("[EMAIL PROTECTED]", "gsoc2008");
Feed feed = (Feed) myService.getFeed(new URL(uri), Feed.class);
msg.setBody(feed);*
However, I am having some issues with marshalling/unmarshalling the Feed
object while passing it to the message body. I got these output:
Exception in thread "main" java.lang.IllegalArgumentException:
com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 3 counts of
IllegalAnnotationExceptions
com.google.gdata.data.BaseFeed does not have a no-arg default constructor.
this problem is related to the following location:
at com.google.gdata.data.BaseFeed
at com.google.gdata.data.Feed
com.google.gdata.client.Service$GDataRequestFactory is an interface, and
JAXB can't handle interfaces.
this problem is related to the following location:
at com.google.gdata.client.Service$GDataRequestFactory
at public com.google.gdata.client.Service$GDataRequestFactory
com.google.gdata.client.Service.getRequestFactory()
at com.google.gdata.client.Service
at public com.google.gdata.client.Service
com.google.gdata.data.BaseEntry.getService()
at com.google.gdata.data.BaseEntry
at public java.util.List com.google.gdata.data.BaseFeed.getEntries()
at com.google.gdata.data.BaseFeed
at com.google.gdata.data.Feed
com.google.gdata.client.Service$GDataRequestFactory does not have a no-arg
default constructor.
this problem is related to the following location:
at com.google.gdata.client.Service$GDataRequestFactory
at public com.google.gdata.client.Service$GDataRequestFactory
com.google.gdata.client.Service.getRequestFactory()
at com.google.gdata.client.Service
at public com.google.gdata.client.Service
com.google.gdata.data.BaseEntry.getService()
at com.google.gdata.data.BaseEntry
at public java.util.List com.google.gdata.data.BaseFeed.getEntries()
at com.google.gdata.data.BaseFeed
at com.google.gdata.data.Feed
. . .
BaseFeed is a super type of Feed, and although it does not have a no-arg
default constructor, the Feed has one.
Thoughts?
--
Douglas Siqueira Leite
Computer Science Master's degree student of University of Campinas (Unicamp)
