We are successfully using the class provided at
https://github.com/juchong/ADIS16448...ee/master/Java
We downloaded and placed that class in the same package with the Robot.java class and imported it into Robot.java. Define a new ADIS16448_IMU as shown in their example
https://github.com/juchong/ADIS16448...ple/Robot.java and it should work just fine.
Let me know if you are still getting an error.