Fengzhi,
I'd suggest you try and experiment a little with jBPM. You'll see that it can
invoke java classes at almost any moment that can do anything you want. The other way
around, jbpm has a 'command' interface or just use the api. jBPM usage in seam and
jboss esb (or even other esb's like mule) also have al lot of examples.
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