Beta node indexes don't support type coercion --------------------------------------------- Key: DROOLS-2695 URL: https://issues.jboss.org/browse/DROOLS-2695 Project: Drools Issue Type: Bug Components: core engine Reporter: Mario Fusco Assignee: Mario Fusco When there is a type mismatch (e.g. String vs Integer) in a constraint, usually a type is coerced and a rule is fired. {code} rule "R2" when $f : MyFactB( strData == 20 ) then System.out.println( "R2 fired : $f = " + $f ); end {code} As far as I investigate, in case of AlphaNode, MVEL does the coercion. Also AlphaNode hashing does the coercion (https://github.com/kiegroup/drools/blob/7.5.0.Final/drools-core/src/main/...). However, in case of JoinNode, it doesn't coerce so doesn't fire. {code} rule "R1" when MyFactA( $i : intData ) $f : MyFactB( strData == $i ) then System.out.println( "R1 fired : $f = " + $f ); end {code}