Memory leak in stateful session after retracting facts

Fact Class: @Role(Type.FACT) public class Facility implements Serializable { private static final long serialVersionUID = 1L; private int id; private String name; ... getters/constructors, no setters; hashcode/equals based on id. } Inserting code for (int i = 1; i < 400_000; i++) {kieSession.insert(new Facility(i, "Fac" + i));} emarKS.fireAllRules(); Deleting code: public class RemoveFacilities {private int id;...} RemoveFacilities toRemove = new RemoveFacilities(1); FactHandle fh = emarKS.insert(toRemove); emarKS.fireAllRules(); emarKS.delete(fh); emarKS.fireAllRules(); The deleting rule: rule "Remove Facilities with id above x" when RemoveFacilities($id:id) $fac:Facility(id>=$id) then delete($fac); end