There really should have been usage instructions with the .jar file. You can't really just throw these things at a Java runtime (once you've figured out how to throw them) and hope for the best.
java -jar "\Documents and Settings\brickbatbae\Desktop\gcode for reprap\repgcode-0.3.jar"
brickbatbae wrote:I find that interesting. It could mean that java cannot find the file that is supposed to be run, or that it doesn't exist.
Caused by: java.lang.ClassNotFoundException: gnu.io.CommPortIdentifier