HHH-9312 - Database connection leak with JTA transaction tracking and background thread not releasing database connection

hibernate-core/src/main/java/org/hibernate/engine/transaction/synchronization/internal/SynchronizationCallbackCoordinatorNonTrackingImpl.java

@@ -62,6 +62,10 @@ public class SynchronizationCallbackCoordinatorNonTrackingImpl implements Synchr
 		afterCompletionAction = STANDARD_AFTER_COMPLETION_ACTION;
 	}
 
+	protected final TransactionCoordinator transactionCoordinator() {
+		return transactionCoordinator;
+	}
+
 	private TransactionContext transactionContext() {
 		return transactionCoordinator.getTransactionContext();
 	}

hibernate-core/src/main/java/org/hibernate/engine/transaction/synchronization/internal/SynchronizationCallbackCoordinatorTrackingImpl.java

@@ -79,6 +79,10 @@ public class SynchronizationCallbackCoordinatorTrackingImpl extends Synchronizat
 				// check for it in SessionImpl. See HHH-7910.
 				delayedCompletionHandlingStatus = status;
 
+				// no matter what we need to release the Connection.  Not releasing
+				// the Connection here can lead to leaked Connections.
+				transactionCoordinator().getJdbcCoordinator().getLogicalConnection().close();
+
 				log.rollbackFromBackgroundThread( status );
 				return;
 			}