Re: Can't serialize a Hashset for an RPC call

If you are Google App Engine, then the problem could be that even if
you saved a java.util.HashSet<Long> to the datastore, it will give you
back a org.datanucleus.sco.backed.HashSet<Long> when you retrieve the
parent object. It's allowed, because the sco backed version is a
subclass of java.util.HashSet.
However, GWT cannot serialize a sco backed HashSet, and you get the
error shown.

Solution - convert your sco backed HashSet to a java.util.HashSet on
the server before sending back to the client.

--
You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.
To post to this group, send email to google-web-toolkit@googlegroups.com.
To unsubscribe from this group, send email to google-web-toolkit+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.