During this assignment, the following jar libraries shall be configured for your project:

Add these libraries (right click on the project, then "Properties") to the "Java Build Path" libraries by pushing the button "Add external JARs".

For RXTXcomm.jar, you also need to configure its "Native library location".

See below the picture for example. The actually places of these JARs may vary, depending on your installations.

Libraries.png