[rules-users] check whether a key is present in global Map, i.e. mimicking containsKey() behavior

Hello, I'm using Drools 5.1.1 in a JavaSE 6 project. I can't get running a rule where a value obtained from WM is check for existence as a key of a global Map. I have a map of the type ProductTextCode -> Product, where keys are String and values Product /global Map productMap/ Then in a rule a I want a condition where each String in WM is tested against map keyset. / rule "Product ID not in products map" dialect "mvel" when $pid : String() => Here goes the condition <= then System.out.println("Invalid product id: " + $pid) retract ($pid) end / So far I've tried with productMap.containsKey($pid) but a get a MVEL error as it takes 'containsKey' as a property. Please help. Thank you. -- View this message in context: http://drools.46999.n3.nabble.com/check-whether-a-key-is-present-in-globa... Sent from the Drools: User forum mailing list archive at Nabble.com.