Juan Carlos Garcia created DROOLS-1078: ------------------------------------------ Summary: Drools can incorrectly generate Java code to access a method on a wrong reference type for a covariant return Key: DROOLS-1078 URL: https://issues.jboss.org/browse/DROOLS-1078 Project: Drools Issue Type: Bug Affects Versions: 6.3.0.Final, 6.2.0.Final Reporter: Juan Carlos Garcia Assignee: Mark Proctor Attachments: DroolsBugDemo.zip Drools will incorrectly generate Java code to access a method on a wrong reference type, hence resulting in a rule compilation error. Taking the following rule as example (which is also attached), {code} import bug.demo.Table; import bug.demo.Constants; import bug.demo.Player; import bug.demo.event.GenericEvent; import bug.demo.api.model.Card; rule "BuggyRule" when $discardCardEvent : GenericEvent(eventName=="fooEvent", $discardedCard : Card.fromMap(getEventProperty("fooCard")), Constants.FOO_RANK.contains($discardedCard.getRank()), $playerIndex : slotIndex) from entry-point "foo-stream" $table : Table($currentPlayer : getCurrentPlayer()) then $table.addToDiscardPile($discardedCard); $table.reset(); $currentPlayer.removeCard($discardedCard); end {code} In this case when compiling the following rule, we may end up (sometimes) with compilation error: *The method removeCard(Card) is undefined for the type TurnbasedPlayer* , when a Player type should be used in first place. Attached is sample project to reproduce the problem, be aware that you may need to do *mvn clean test* several times until you actually trigger the problem, if you are lucky enough it will get trigger the first time you execute it. Environment: {code} Apache Maven 3.2.5 (12a6b3acb947671f09b81f49094c53f426d8cea1; 2014-12-14T18:29:23+01:00) Maven home: /usr/share/maven Java version: 1.7.0_79, vendor: Oracle Corporation Java home: /usr/lib/jvm/jdk-7-oracle-x64/jre Default locale: en_US, platform encoding: UTF-8 OS name: "linux", version: "3.13.0-77-generic", arch: "amd64", family: "unix" {code} -- This message was sent by Atlassian JIRA (v6.4.11#64026)