GWT how can I reduce the size of code serializers for RPC calls

I found that the more than 60% of the javaScript code generated by GWT on my application is for RPC serializers. Also I found that serializers are not shared between service interfaces, I mean if I have for example AccountDTO type referenced on 2 rpc service interfaces, I will get 2 serializer classes instead of 1 for the same type. In Order to reduce the size of the compiled code I was thinking that maybe I could use Deferred Binding in order to do a replacement of all the services interfaces I have for one big interface. If that could be possible, maybe then GWTCompiler will produce only one AccountDTO serializer instead of 2.

I'm not sure this is a good idea or if there is a better solution for my problem.

What I was trying to implement was something like this:

// Define new interface that extends all service interfaces
public interface GenericService extends RemoteService,
                    AccountingService,
                    FinancialService,..., { }

public interface GenericServiceAsync extends AccountingServiceAsync,
                         FinancialServiceAsync, ..., { }

// At Application.gwt.xml do:

<module>
...
...
    <replace-with class="com.arballon.gwt.core.client.GenericService">
        <when-this-is class="com.arballon.gwt.core.client.AccountingService>
    </replace-with>
    <replace-with class="com.arballon.gwt.core.client.GenericService">
        <when-this-is class="com.arballon.gwt.core.client.FinancialService>
    </replace-with>
    ...
    ...

But at the moment I was receiving the error:

[ERROR] Errors in 'file:/C:/Users/Daniel/EclipseWorkspace/ADK/src/com/arballon/gwt/core/client/FinancialService.java' [ERROR] Line 31: Rebind result 'com.arballon.gwt.core.client.GenericService' could not be found

Any thoughts about the issue will be appreciated. Regards

Daniel