Thank you Lance Java it works...
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You will need to set the "encoder" attribute on your so that
tapestry can serialize / deserialize the values used to poplulate the form.
http://tapestry.apache.org/5.3.1/apidocs/org/apache/tapestry5/corelib/components/Loop.html
I'd also try to get rid of your mutable static data (Session) in fav
