Here's a quick little method to take control of the classpath right inside a Jython script.

Classpath control inside Jython script

import sys

...

def setClassPath():
  libDir = "/path/to/my/jar/files/"
  classPaths = [
    "foo.jar",
    "bar.jar"
  ]
  for classPath in classPaths:
    sys.path.append(libDir + classPath)