You may also want to check out 

http://www.javaworld.com/javatips/jw-javatip136_p.html

"Summary
Struts, from the Apache Jakarta Project, implements
the Synchronizer Token pattern to prevent duplicate
form submission. Applying this pattern, you can detect
this situation and follow an alternate course of
action when it happens. But which alternate action? In
most cases, the best solution would be to simply
recover the first submit's result. This tip suggests a
simple strategy to achieve that goal. (750 words;
March 14, 2003)"

HTH

Dan

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