I just had a problem using Ant on Mac OS X 10.4.x. As I was trying to get the jarbundler task to run, the jarbundler help text said to copy the jarbundler.jar file to the
/Developer/Java/Ant/lib directory. Turns out this isn't right for my system, but I didn't know where Ant was getting its libraries from.
My exact error was:
taskdef class net.sourceforge.jarbundler.JarBundler cannot be found
Fortunately the following Ant command gave me all the output I needed, and much more: