Re: [appengine-java] Can't have more than one @Embedded of same type JPA

Tue, 19 Jan 2010 05:12:29 -0800

The example in the docs uses the EmbeddedOnly annotation on the component class so perhaps give that a try. You should be able to embed more than one instance of the same class so this sounds like a bug. From the docs "If you have more than one field on the object whose type is an embedded class, you must rename the fields of one so they do not conflict with another." 

http://code.google.com/appengine/docs/java/datastore/dataclasses.html#Embedded_Classes
So for the second class you need to specify field names manually for every field.
With Twig you can also embed collections of objects without any of that boiler plate config. http://code.google.com/p/twig-persist/ 

JD

On 19 Jan 2010, at 09:54, Nick Bonatsakis wrote:


Hi All,

I just updated to version 1.3.0 and I am now getting a runtime
datanucleus exception complaining about having two @Embedded fields of
the same type on an @Entity class. It seems like

Error message is:

"class has multiple relationship fields of type.  This is not yet
supported"

Should this really be happening, these are not @Entity objects, they
are @Embeddable and the fields are declared as @Embedded.

Thanks!
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