Package names are written in all lower case to avoid conflict with the names of classes or interfaces.
If you application runs with no problems, and you don't care much about best practice, then your fine.
But it is best practice to keep the naming of your packages all in lower cases. :-)
You can read more about this at Oracle's documentation on Java: http://docs.oracle.com/javase/tutorial/java/package/namingpkgs.html