code: def get_jar(base_name, dname):
      
      jars = glob.glob(os.path.join(expand_path(dname), "%s*.jar" % base_name))
  
      if len(jars) == 1:
          return jars[0]
      elif len(jars) > 1:
          raise ValueError("Found multiple jars for %s in %s. Need single jar: %s" %
                           (base_name, dname, jars))
      else:
          raise ValueError("Could not find java jar %s in %s" %
                           (base_name, dname))
docs: Retrieve a jar in the provided directory