Read the definition of lock-on-active: it inhibits the firing of your second rule. It is almost certainly a bad idea to use Map objects like this. Beans are much better suited, as you could write rules such as when MyType( year == 2012, state == null ) then modify(...) -W -- View this message in context: http://drools.46999.n3.nabble.com/why-java-util-Map-doesn-t-work-on-RHS-u... Sent from the Drools: User forum mailing list archive at Nabble.com.