Re: [rules-users] Events facts in process constraints

It is definitively possible to use events in process constraints. Your exception, though, implies that you are using a sliding time window on a fact type that is not declared as an event. In later versions I improved the error handling to raise a compile time error when this is detected, but I guess you are using 5.0.1, where it still throws a runtime exception: java.lang.ClassCastException: org.drools.common.DefaultFactHandle cannot be cast to org.drools.common.EventFactHandle at org.drools.rule.SlidingTimeWindow.updateNextExpiration(SlidingTimeWindow.java:192) Can you double check your rules to make sure you are not doing that? Edson 2010/2/10 paulB <paul.borlin(a)sironahealth.com&gt; -- Edson Tirelli JBoss Drools Core Development JBoss by Red Hat @ www.jboss.com