first of all, ditch the contextInstance.variables.decisao in favour of just decisao. That should be enough. And what linkage error? Look at the testcases in the source for good working examples. Guarded transtions are transitions that are not always available. They are available to be taken depending on the outcome of the 'condition', just like in UML View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4063951#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...