http://www.jython.org/install.html details all the possible installation problems and combinations.
java -cp . jython-21
seemed to work for me on XP (still had to set up the path to the install directory to run Jython and build self-contained JARs afterwards though).
----- Original Message -----
From: Ian and Diana Clark
To: jython-users@lists.sourceforge.net
Sent: Saturday, September 14, 2002 4:49 PM
Subject: [Jython-users] Help needed for jythoneer tyro..

I'm a recovering Perl programmer and have been playing with Python recently.
I now am aware of the nice fit between Jython and Java and want to operate in that environment.
At home I'm on Win98 and have downloaded and set paths for J2SE1.4 and proved it so by typing java -version at the DOS prompt.
I've now downloaded JYTHON-21 and entered java jython-21 and received the message...
"Exception in thread main" java.lang.NoClassDfFoundError: jython-21"
Now...how have I shot myself in the foot???