Does your page get called and "the result page called up" gets printed
to the log, or does this not get printed to the log at all? Trying to
sort out whether this is an ATG issue or a JSON-taglib issue.
If you don't see your message in your log, then you likely need to set
either an action on your ATG <dsp:form> tag, or you need to set a
success URL on your form-handler.
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Jeremy Sears