[ Tony Maniaci ]
>  I am running under XP and at the command line I entered the following
>  as 
>  detailed in the installation instructions:
>  
>  C:\>java jython-21
>  Exception in thread "main" java.lang.NoClassDefFoundError: jython-21

The installation instructions on http://www.jython.org/install.html
also say:
It can be necessay to set the CLASSPATH to include the current
directory 
 java -cp . jython-21 
 java -classpath . jython-21 

This means in your case:
- cd to the directory where you downloaded jython-21.class
- type in one of the java commands above

Best wishes,
Oti.


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