killbill-memoizeit

diff --git a/invoice/src/main/java/org/killbill/billing/invoice/InvoiceDispatcher.java b/invoice/src/main/java/org/killbill/billing/invoice/InvoiceDispatcher.java
index 411e48f..17f8073 100644
--- a/invoice/src/main/java/org/killbill/billing/invoice/InvoiceDispatcher.java
+++ b/invoice/src/main/java/org/killbill/billing/invoice/InvoiceDispatcher.java
@@ -304,10 +304,11 @@ public class InvoiceDispatcher {
                     }
                 }
             } else /* Dry run use cases */ {
-
                 final NotificationQueue notificationQueue = notificationQueueService.getNotificationQueue(DefaultInvoiceService.INVOICE_SERVICE_NAME,
                                                                                                           DefaultNextBillingDateNotifier.NEXT_BILLING_DATE_NOTIFIER_QUEUE);
-                final Iterable<NotificationEventWithMetadata<NextBillingDateNotificationKey>> futureNotifications = notificationQueue.getFutureNotificationForSearchKeys(context.getAccountRecordId(), context.getTenantRecordId());
+                final Iterable<NotificationEventWithMetadata<NextBillingDateNotificationKey>> futureNotificationsIterable = notificationQueue.getFutureNotificationForSearchKeys(context.getAccountRecordId(), context.getTenantRecordId());
+                // Copy the results as retrieving the iterator will issue a query each time. This also makes sure the underlying JDBC connection is closed.
+                final List<NotificationEventWithMetadata<NextBillingDateNotificationKey>> futureNotifications = ImmutableList.<NotificationEventWithMetadata<NextBillingDateNotificationKey>>copyOf(futureNotificationsIterable);
 
                 final Map<UUID, DateTime> nextScheduledSubscriptionsEventMap = getNextTransitionsForSubscriptions(billingEvents);