I am having trouble creating GWT user defined data types that are
serializable. I get a compiler error saying something like "Type X was not
serializable and has no concrete serializable subtypes.
For example I have:
public interface IDisplayable<U> extends IsSerializable{
U getURL();
}
public class GWTDisplayable implements IDisplayable<URL>, IsSerializable{
URL getURL();
}
Note GWTDisplayable does have a no-arg constructor.
Why do I get this error? I have a subtype and they both implement
IsSerializable (although the docs say only one need this).
-Dave
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