Actions in RuleFlow are interpreted at runtime
using MVEL. This error seems to indicate that there is a problem in the
syntax of your MVEL expression. However, looking at your example, I do not
see any problem, System.out.println("Your text here"); as action property should
work (I just tested it with the 4.0.1 release). Could you open a JIRA and
provide a self-contained test that shows the problem?
That said, we still need to add syntax checking for
actions during ruleflow validation, to ensure that this error is
encountered when checking the ruleflow (at compile time) and not during
execution.
Kris