I am facing a problem in the use of USE. Here is an example of the code I am using:
class B < A
two classes A is a supper class of B. The supper class A has copposition relation to class C and an association with D. That is:
composition AC between
A role anA
C role theCs
association DA between
D role aD
A role anA
Now, the proplem is when instantiating the class A as follows:
use> !create a:A
<input>:1:0: Cannot instantiate association class `A' without participants.
However, when I create an object of class A's specialization (class B), then it is OK. Also, I do not get a message when creating a new object of A in the GUI.
Do you have any idea why this might occure?
when I use your example model in USE 3.0.2 all works fine.
However, the error messages indicates that you defined A as an association class.
Instances of association classes can only be created when also specifying the participating objects of the association:
!create a:A between (p1, p2)
I guess I abstracted out too much details from the actual complicated model that I am working on. This might be the reason why it worked with you.
However, I do not have any association classes in my model, but still I get this message. I have a composition, on the other hand. Does the composition have any effect?
Also, why I get the message only with the supper class A not with the subclass B?
Thanks for your help.
I had a look through the code and found the issue.
Currently there is a bug, if an association has the same name as a class.
I fixed it for the next release, but for now you need to rename eiter the class A oder the association A.
Thank you very much. This actually fixes the problem. I spent a very long time trying to understand why my ASSL procedures to are not working to instantiate the model properly. Now, I understand.
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