Re: GWT + GAE common issues.

1. I don't think so.  They're meant to be used from the server side of GWT.  For exposing server objects you use RequestFactory in combination with ValueProxy

2. I suggest you take a look at the "expenses" sample that comes with GWT.

http://code.google.com/p/google-web-toolkit/source/browse/#svn%2Ftags%2F2.4.0%2Fsamples%2Fexpenses

You can see the Employee object in its server version here:

http://code.google.com/p/google-web-toolkit/source/browse/tags/2.4.0/samples/expenses/src/main/java/com/google/gwt/sample/expenses/server/domain/Employee.java

and its client representation here:

http://code.google.com/p/google-web-toolkit/source/browse/tags/2.4.0/samples/expenses/src/main/java/com/google/gwt/sample/expenses/shared/EmployeeProxy.java

RequestFactory intro here:

http://code.google.com/webtoolkit/doc/latest/DevGuideRequestFactory.html

3. MVP won't really touch this since it's client side so it only sees proxy types

So if you want to expose an AppEngine key, you would use KeyFactory to convert it to a string for the client and back to a string for the server.  If you want to expose AppEngine's User object, you would use a ValueProxy instead of an EntityProxy, e.g.,

@ProxyForName("com.google.appengine.api.users.User")

public interface UserProxy extends ValueProxy {

  String getNickname();

  String getEmail();

}

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