Ice 3.5.0 java optional return values.

Given:

module Demo {
    interface OptReturn {
        optional(1) string returnOptionalString();
    };
};

slice2java generates client-side code to support the optional return type:

public interface OptReturnPrx extends Ice.ObjectPrx
{
    public Ice.Optional<String> returnOptionalString();
}

But it generates server-side code that ignores the optional return type:

public interface _OptReturnOperations
{
    String returnOptionalString(Ice.Current __current);
}

public abstract class _OptReturnDisp extends Ice.ObjectImpl implements OptReturn
{
    public final String returnOptionalString()
    {
        return returnOptionalString(null);
    }
}

The AMD type (if enabled) also ignores the optional type:

public interface AMD_OptReturn_returnOptionalString extends Ice.AMDCallback
{
    void ice_response(String __ret);
}