Kubuntu 9.10
AMD64
user@computer:~$ java -jar opensongj.jar
Storing new song library location at /home/user\songs
Storing new sets library location at /home/user\sets
Storing new backgrounds library location at /home/user\backgrounds
Warning: no files found in song library directory
Warning: no files found in presentation set directory
Warning: no files found in presentation image directory
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 0
at java.util.Vector.get(Vector.java:721)
at ui.components.PresentationComponentList.<init>(PresentationComponentList.java:39)
at ui.SetModePanel.<init>(SetModePanel.java:32)
at ui.MainWindow.<init>(MainWindow.java:18)
at Application.OpenSongJ.<init>(OpenSongJ.java:69)
at Application.OpenSongJ.main(OpenSongJ.java:92)
Its just a file delmiter issue you will need a constant which says which kind of slash is used for folder. you are trying to use the windows one at the moment.
hence
Storing new song library location at /home/user\songs
Storing new sets library location at /home/user\sets
Storing new backgrounds library location at /home/user\backgrounds