Why third-party services is not allowed for "RemoteServiceServlet.delegate"?

Present constructor for such possibility: public
RemoteServiceServlet(Object delegate);
In reality is not worked, exception:

com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException:
This application is out of date, please click the refresh button on
your browser. ( Blocked attempt to access interface 'com....', which
is not implemented by 'com....'; this is either misconfiguration or a
hack attempt )

Will be nice to have it worked.
Also make "delegate" not final, with possibility to change in runtime
by setter.

For example, for integration with Spring, in "init(ServletConfig
config)" get service from Spring context and set as delegate.

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