Roo+GWT: how to custom persist operation at server side?

hi all:
i'm trying to do a web project using roo+gwt, the goal is simple: i
create a entity(bean) from web UI,then send to server and persist it,
but before persistence, i need to modify beans using setter. how can
achieve this from Roo generated project. seems there is no way of
doing so?

anyone can give some suggestion about this? thanks a lot.

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