Hi and thanks for your reply. 

i've investigated your suggestions and must say it's more complex as i 
thought. Some Interfaces go'es through the rpc serialization, others not. 
The problem is that i have some enum's in my sources and rpc don't accept 
them. I'm currently redesign my model and let you know if it works. ^^

greetings

Am Dienstag, 13. März 2012 10:09:31 UTC+1 schrieb Alex Dobjanschi:
>
> try to use classes first, but you can definitely use interfaces. there are 
> a couple of considerations: 
> 1 interfaces must extend Serializable
> 2 those interfaces must be found by gwt rpc generator, so place them in 
> one of the source imports of gwt module
> 3 implementations of these interfaces must also be visible to gwt rpc 
> generator - that means, also be included in a visible package - along with 
> the usual serialization requirements

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