HHH-18516 - Ignore @AttributeOverride for map key when checking type of map value

hibernate-core/src/main/java/org/hibernate/boot/model/internal/CollectionBinder.java

@@ -2356,8 +2356,7 @@ public abstract class CollectionBinder {
 		}
 		else {
 			//force in case of attribute override
-			final boolean attributeOverride = property.hasDirectAnnotationUsage( AttributeOverride.class )
-					|| property.hasDirectAnnotationUsage( AttributeOverrides.class );
+			final boolean attributeOverride = mappingDefinedAttributeOverrideOnElement(property);
 			// todo : force in the case of Convert annotation(s) with embedded paths (beyond key/value prefixes)?
 			return isEmbedded || attributeOverride
 					? EMBEDDABLE
@@ -2365,6 +2364,11 @@ public abstract class CollectionBinder {
 		}
 	}
 
+	protected boolean mappingDefinedAttributeOverrideOnElement(MemberDetails property) {
+		return property.hasDirectAnnotationUsage( AttributeOverride.class )
+				|| property.hasDirectAnnotationUsage( AttributeOverrides.class );
+	}
+
 	static AnnotatedColumns createElementColumnsIfNecessary(
 			Collection collection,
 			AnnotatedColumns elementColumns,

hibernate-core/src/main/java/org/hibernate/boot/model/internal/MapBinder.java

@@ -109,6 +109,26 @@ public class MapBinder extends CollectionBinder {
 		};
 	}
 
+	@Override
+	protected boolean mappingDefinedAttributeOverrideOnElement(MemberDetails property) {
+		if ( property.hasDirectAnnotationUsage( AttributeOverride.class ) ) {
+			return namedMapValue( property.getDirectAnnotationUsage( AttributeOverride.class ) );
+		}
+		if ( property.hasDirectAnnotationUsage( AttributeOverrides.class ) ) {
+			final AttributeOverrides annotations = property.getDirectAnnotationUsage( AttributeOverrides.class );
+			for ( AttributeOverride attributeOverride : annotations.value() ) {
+				if ( namedMapValue( attributeOverride ) ) {
+					return true;
+				}
+			}
+		}
+		return false;
+	}
+
+	private boolean namedMapValue(AttributeOverride annotation) {
+		return annotation.name().startsWith( "value." );
+	}
+
 	private void makeOneToManyMapKeyColumnNullableIfNotInProperty(MemberDetails property) {
 		final Map map = (Map) this.collection;
 		if ( map.isOneToMany() && property.hasDirectAnnotationUsage( MapKeyColumn.class ) ) {

hibernate-core/src/test/java/org/hibernate/orm/test/annotations/attributeoverride/MapAttributeOverrideTest.java

@@ -0,0 +1,45 @@
+package org.hibernate.orm.test.annotations.attributeoverride;
+
+import java.time.LocalTime;
+import java.util.Map;
+
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.metamodel.EntityType;
+import jakarta.persistence.metamodel.MapAttribute;
+
+import static jakarta.persistence.metamodel.Type.PersistenceType.BASIC;
+import static jakarta.persistence.metamodel.Type.PersistenceType.EMBEDDABLE;
+import static org.assertj.core.api.Assertions.assertThat;
+
+@DomainModel(
+		annotatedClasses = {
+				Schedule.class,
+				Route.class
+		}
+)
+@SessionFactory
+class MapAttributeOverrideTest {
+
+	@Test
+	@JiraKey("HHH-18516")
+	void testMapOfEmbeddableKeysWithAttributeOverridesAndBasicValues(SessionFactoryScope sessionFactoryScope) {
+		sessionFactoryScope.inTransaction(session -> {
+			EntityType<Schedule> scheduleType = session.getMetamodel().entity(Schedule.class);
+			MapAttribute<? super Schedule, ?, ?> departuresMapAttribute = scheduleType.getMap("departures");
+			// Presence of @AttributeOverride-s for the key should only affect the type of the key, but not the type of the value
+			assertThat(departuresMapAttribute.getKeyType().getPersistenceType()).isEqualTo(EMBEDDABLE);
+			assertThat(departuresMapAttribute.getElementType().getPersistenceType()).isEqualTo(BASIC);
+
+			session.persist(new Schedule(Map.of(
+					new Route("Hamburg", "Vienna"), LocalTime.NOON,
+					new Route("Warsaw", "Barcelona"), LocalTime.MIDNIGHT
+			)));
+			assertThat(session.createQuery("FROM Schedule s", Schedule.class).getResultCount()).isOne();
+		});
+	}
+}

hibernate-core/src/test/java/org/hibernate/orm/test/annotations/attributeoverride/Route.java

@@ -0,0 +1,18 @@
+package org.hibernate.orm.test.annotations.attributeoverride;
+
+import jakarta.persistence.Embeddable;
+
+@Embeddable
+public class Route {
+
+	private String origin;
+	private String destination;
+
+	public Route() {
+	}
+
+	public Route(String origin, String destination) {
+		this.origin = origin;
+		this.destination = destination;
+	}
+}

hibernate-core/src/test/java/org/hibernate/orm/test/annotations/attributeoverride/Schedule.java

@@ -0,0 +1,32 @@
+package org.hibernate.orm.test.annotations.attributeoverride;
+
+import java.time.LocalTime;
+import java.util.Map;
+
+import jakarta.persistence.AttributeOverride;
+import jakarta.persistence.Column;
+import jakarta.persistence.ElementCollection;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+
+@Entity
+public class Schedule {
+
+	@Id
+	@GeneratedValue
+	private Long id;
+
+	@ElementCollection
+	@Column(name = "time")
+	@AttributeOverride(name = "key.origin", column = @Column(name = "orig"))
+	@AttributeOverride(name = "key.destination", column = @Column(name = "dest"))
+	private Map<Route, LocalTime> departures;
+
+	public Schedule() {
+	}
+
+	public Schedule(Map<Route, LocalTime> departures) {
+		this.departures = departures;
+	}
+}