Spring .NET Expression referencing object definition

I am trying to reference another object that I have defined in my Spring config file from an expression. Specifically, I am trying to populate a property with the value of the expression in which I am calling the method, and then the property of the object returned from that method.
I've tried the following (names have been changed):

<property name="NullableIntProperty"
          expression="#{Some.Object.Id}.Get().NullableIntValue"/>

      

        
        
        
      

    

where Some.Object.Id

is a reference to another object that I defined in the config file, for example:

<object id="Some.Object.Id" ... >

      

        
        
        
      

    

but my app doesn't start with a parse exception expecting "COLON", found '}'

. I think it expects a namespace, but I can't find any documentation for that.

I've tried several things, but everywhere I am stumped. I originally tried a combination of MethodInvokingFactoryObject

and PropertyRetrievingFactoryObject

, which we use elsewhere for nullable types, but this fails for nullable values, which is actually null

because Spring sees a factory object returning null

as a failure (which it usually is).