I downloaded your code and just import it into Apache NetBeans IDE 12.1. When I connect the device and run your code it gives the following error. I also tried to plug and unplug the device exception shown in the log. I am using jdk 13 and I also tried with jdk 8.1. When I comment the "@test" annotation in Beurer TestBM55USBService in Test Packages the project Build Successfully. Can you guide me on what I am doing wrong?