hi Bruno Oliveira,
Here are some resources that may help you about service task
http://blog.athico.com/2011/07/develop-complex-jbpm-processes-all-in.html
http://vimeo.com/26126678
http://docs.jboss.org/jbpm/v5.3/userguide/ch.domain-specific-processes.html
Hope it helps.
Regards,
Thomas Setiabudi
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