I have a quick question concerning external systems within component diagrams: can they be depicted by a component in combination with the stereotype <<external>>? Or should I use another notation?
yes, it can be shown with <<external>> as a stereotype but along with that I would also recommend to add a text at the left of the box [provided you draw one] with the text "External Systems (External to JVM)".
This way it will be very clear to the examiner that this component is external to your SuD.
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