Use the -jar command line option to run a .jar file:

java -jar GoogleVideoUploader.jar

How to get "java". Install the jre (Java Runtime Environment) from Sun.


Special note for Fedora Core 4:
http://fedora.redhat.com/docs/release-notes/fc4/#id2503931


Download the JRE:
http://javashoplm.sun.com/ECom/docs/Welcome.jsp?StoreId=22&PartDetailId=jre-1.5.0_05-oth-JPR&SiteId=JSC&TransactionId=noreg

(The URL above is almost certain to break or be out of date. Leave it
to Sun to complicate a simple process of providing a simple URL for
the current version of the JRE).


Sun's Java 1.5.0 download page. To just run Java applications, you
probably want the JRE aka the J2SE Runtime Environment.

http://java.sun.com/j2se/1.5.0/download.jsp