Bug when parsing fact from String to Double in Drools ----------------------------------------------------- Key: DROOLS-3880 URL: https://issues.jboss.org/browse/DROOLS-3880 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 7.0.0.Final Environment: Ubuntu, Intellij Idea Reporter: Almas Toimbekov Assignee: Mario Fusco Priority: Major When one inserts a new object in drl file and afterward wants to compare its String representation of a number with another number in next rules Drools gives an exception. It is much clearer with an example (below in code section) Interesting that when you compare it as a String (amount == "10") - it works fine. But when you try to parse "amount" to Double then Java doesn't know that there is any value at all (thinks amount == null and therefore cannot parse it). The second interesting thing is that if you created this object (resource) in java and inserted it before "fireAllRules()" - "amount" field become visible to the parser and it works. But the matter is that I cannot create this object before firing rules because I don't know wheter there will be a need of it. And my fields must be String as well. And I have to compare it like "more than" or "less than", so comparing strings doesn't apply.