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I was able to connect a TableInput operator to a Stream Projection and Filter operator multiple times. When I open the Stream Projection and Filter operator, I can see the node "PersonsOfInterest" shown multiple times. I guess this is a bug. I think, when the user tries to connect two operators that are already connected, we should ignore the operation.
Created attachment 64489 [details] Image illustrating the problem
working on it now.
Fixed now.
Verified the fix using JavaCAPS R6 (NB 6.1) with IEP nbm files from build080120 installed. Followed the steps to reproduce and also tried connecting other operators more than once. I am unable to connect the same two operators more than once. The GUI also displays a red "X" for a visual cue that connection is not possible.