final RuleBase ruleBase = RuleBaseFactory.newRuleBase();
ruleBase.addPackage( builder.getPackage() );
final StatefulSession session = ruleBase.newStatefulSession();
session.addEventListener( new DefaultAgendaEventListener() {
public void afterActivationFired(final AfterActivationFiredEvent arg0) {
super.afterActivationFired( arg0,
session );
}
} );