when I put lock-on-active, the rule will never fire if there is only one agenda group in a stateful session. -- View this message in context: http://drools.46999.n3.nabble.com/How-to-let-a-rule-run-only-one-time-tp3550555p3563828.html Sent from the Drools: User forum mailing list archive at Nabble.com.