HHH-19394 disable transient reference checking for readonly entities

Author: gavinking

hibernate-core/src/main/java/org/hibernate/event/internal/AbstractFlushingEventListener.java

@@ -147,7 +147,7 @@ void checkForTransientReferences(EventSource session, PersistenceContext persist
 		// into Nullability, instead of abusing the Cascade infrastructure)
 		for ( Map.Entry<Object, EntityEntry> me : persistenceContext.reentrantSafeEntityEntries() ) {
 			final EntityEntry entry = me.getValue();
-			if ( flushable( entry ) ) {
+			if ( checkable( entry ) ) {
 				Cascade.cascade(
 						CascadingActions.CHECK_ON_FLUSH,
 						CascadePoint.BEFORE_FLUSH,
@@ -167,6 +167,12 @@ private static boolean flushable(EntityEntry entry) {
 			|| status == Status.READ_ONLY; // debatable, see HHH-19398
 	}
 
+	private static boolean checkable(EntityEntry entry) {
+		final Status status = entry.getStatus();
+		return status == Status.MANAGED
+			|| status == Status.SAVING;
+	}
+
 	private void cascadeOnFlush(EventSource session, EntityPersister persister, Object object, PersistContext anything)
 			throws HibernateException {
 		final PersistenceContext persistenceContext = session.getPersistenceContextInternal();