According to 
https://groups.google.com/d/topic/gwt-steering/9K_HtTdVVpE/discussion there 
are some regressions.
I guess your problem is related. The known regression with generics has a 
review pending, so you may be able to test is against trunk in a few days, 
or wait for the 2.5.1 release.

On Wednesday, December 19, 2012 3:36:20 AM UTC+1, objectuser wrote:
>
> I'm working through the upgrade to 2.5 and I'm having trouble with my use 
> of generics when used with an RPC service.  My app works fine in 2.4, but 
> if I change it to use 2.5, my service calls never make it to the server.
>
> I've been able to reproduce the problem by using a generic method.
>
> If I have something like this, it's fine:
>
>   public Result execute(Command command) { ... }
>
> However, if it's like this, the method is never invoked on the server:
>
>   public <T extends SomeType> Result execute(Command<T> command) { ... }
>
> Has anyone else encountered something similar?
>

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