Summary
A public association oriented from a public Classifier cannot be linked to a private or protected Classifier.
Details
Making a public association to a private class usually means that the user of the association won’t be able to use it.
Java or C++ code generated from this kind of association will usually result in compilation error.
Tips
You can:
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Change the visibility of the association to private. It is widely recommended that all attributes and associations be set to private.
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Change the visibility of the target class to public.