If with 'interrupt' you mean do something on the transition, I'm not sure 
anymore for jBPM 4. In 3 you could but few people used it afaik. 

Eventlisteners can do whatever you want them to do but *only* on business 
process events. Not while filling out a form and putting a specific value in a 
formfield. That is more seam pageflow like of jsf/ajax with backingbeans (your 
java class).

Sure you could put generic eventlisteners in jbpm and while filling out a 
formfield send a specific event that does things etc,, but it really 
complicates things. 

Since I have to little detail on what your complete application needs to do it 
its hard to say yes or no, and even if it is crucial/important for others to 
know. The latter simply because jBPM 4 did not change that much from jbpm 3 in 
this regard and we never had this question before. Again, don't try to put 
*everything* in the processdefinition. Seam has pageflow for a reason! 

http://docs.jboss.org/seam/2.1.1.GA/reference/en-US/html/jbpm.html

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