From c67b3f984a0e711e4337492102e1c6035390d659 Mon Sep 17 00:00:00 2001
From: Andrea Boriero <andrea@hibernate.org>
Date: Tue, 29 Nov 2022 16:43:02 +0100
Subject: [PATCH] HHH-15741 Explicit declaration assigned identifier generator
 does not work

---
 .../src/main/java/org/hibernate/cfg/BinderHelper.java          | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hibernate-core/src/main/java/org/hibernate/cfg/BinderHelper.java b/hibernate-core/src/main/java/org/hibernate/cfg/BinderHelper.java
index d63d2c2732..f9f5fbcb93 100644
--- a/hibernate-core/src/main/java/org/hibernate/cfg/BinderHelper.java
+++ b/hibernate-core/src/main/java/org/hibernate/cfg/BinderHelper.java
@@ -787,6 +787,9 @@ public class BinderHelper {
 					|| identifierGeneratorStrategy.equals( "seqhilo" );
 			if ( generatorType == null || !avoidOverriding ) {
 				id.setIdentifierGeneratorStrategy( identifierGeneratorStrategy );
+				if ( identifierGeneratorStrategy.equals( "assigned" ) ) {
+					id.setNullValue( "undefined" );
+				}
 			}
 			//checkIfMatchingGenerator(definition, generatorType, generatorName);
 			parameters.putAll( definition.getParameters() );