To run cart’s application client, select Run->Run Main Project. You will see the output of the application client in the Output pane:
... Retrieving book title from cart: Infinite Jest Retrieving book title from cart: Bel Canto Retrieving book title from cart: Kafka on the Shore Removing "Gravity’s Rainbow" from cart. Caught a BookException: "Gravity’s Rainbow" not in cart. Java Result: 1 run-cart-app-client: run-nb: BUILD SUCCESSFUL (total time: 14 seconds)