[rules-users] drools queries: strange dependency

This message was cross-posted to stack-exchange. If someone wants to answer there, the URL is http://stackoverflow.com/questions/15922343/drools-queries-strange-depend... . I'm somewhat new to Drools, and experienced this strange behavior during writing a query. To start with, the Hotel class here is a subclass of PlaceImpl, which implements the interface Place. PlaceImpl itself is a subclass (via another class) of OntologyClassImpl, where the method getClasses() is implemented in the most trivial way: it returns an already existing java.util.Set of objects. In short, getClasses() is accessible from both Place interface and Hotel class. My problem is this: The following query does not return any result even when there are matching Hotels. query "qryRomantic" $e: Hotel (classes contains Semantics.AMB_Romantic)end However, if I replace Hotel with Place, then the /query returns desired results/, although the ONLY condition-setting rules are written for Hotel, as follows. (This rule actually gets fired several times.) rule "Set semantic class Romantic"no-loop when $hotel: Hotel( ... conditions go here ... ) then modify ($hotel){ addToClasses(Semantics.AMB_Romantic) }end It does not end there. if I add another query to the rule file, for exactly the opposite condition as follows, query "qryNonRomantic" $e: Hotel (classes not contains Semantics.AMB_Romantic)end then the /first query/ starts to return the desired results, /EVEN WHEN the new query is not called at all/! What am I doing wrong? I'd be really grateful for any pointers. -- View this message in context: http://drools.46999.n3.nabble.com/drools-queries-strange-dependency-tp402... Sent from the Drools: User forum mailing list archive at Nabble.com.