This line looks highly suspect. First off, in the classpath you can't use wildcards - you need to list each and every jar file individually. And secondly, you don't need to set the classpath for running Maven - it does all that by itself.
What happens if you just type "mvn clean install"? I just downloaded the examples, typed that line, and -after downloading a large number of artifacts- it did exactly what the instructions said it'd do (build and install the example, that is).