HHH-9460 - Removing non-optional bidirectional @OneToOne association with cascade

hibernate-core/src/main/java/org/hibernate/cfg/OneToOneSecondPass.java

@@ -8,7 +8,6 @@ package org.hibernate.cfg;
 
 import java.util.Iterator;
 import java.util.Map;
-
 import javax.persistence.ConstraintMode;
 
 import org.hibernate.AnnotationException;
@@ -92,12 +91,19 @@ public class OneToOneSecondPass implements SecondPass {
 		value.setCascadeDeleteEnabled( cascadeOnDelete );
 		//value.setLazy( fetchMode != FetchMode.JOIN );
 
-		if ( !optional ) value.setConstrained( true );
-		value.setForeignKeyType(
-				value.isConstrained()
-						? ForeignKeyDirection.FROM_PARENT
-						: ForeignKeyDirection.TO_PARENT
-		);
+		if ( !optional ) {
+			value.setConstrained( true );
+		}
+		if ( value.isReferenceToPrimaryKey() ) {
+			value.setForeignKeyType( ForeignKeyDirection.TO_PARENT );
+		}
+		else {
+			value.setForeignKeyType(
+					value.isConstrained()
+							? ForeignKeyDirection.FROM_PARENT
+							: ForeignKeyDirection.TO_PARENT
+			);
+		}
 		PropertyBinder binder = new PropertyBinder();
 		binder.setName( propertyName );
 		binder.setValue( value );

hibernate-core/src/test/java/org/hibernate/test/annotations/derivedidentities/e4/b/MedicalHistory.java

@@ -25,7 +25,7 @@ public class MedicalHistory {
 
 	@MapsId
 	@JoinColumn(name = "FK")
-    @OneToOne(cascade= CascadeType.ALL)
+    @OneToOne(cascade= CascadeType.PERSIST)
 	Person patient;
 
 	@Temporal(TemporalType.DATE)

hibernate-core/src/test/java/org/hibernate/test/annotations/onetoone/OneToOneMapsIdJoinColumnTest.java

@@ -0,0 +1,117 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.test.annotations.onetoone;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.MapsId;
+import javax.persistence.OneToOne;
+
+import org.hibernate.annotations.NaturalId;
+import org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase;
+
+import org.junit.Test;
+
+import static org.hibernate.testing.transaction.TransactionUtil.doInJPA;
+
+/**
+ * @author Vlad Mihalcea
+ */
+public class OneToOneMapsIdJoinColumnTest extends BaseEntityManagerFunctionalTestCase {
+
+	@Override
+	protected Class<?>[] getAnnotatedClasses() {
+		return new Class<?>[] {
+				Person.class,
+				PersonDetails.class
+		};
+	}
+
+	@Test
+	public void testLifecycle() {
+		Person _person = doInJPA( this::entityManagerFactory, entityManager -> {
+			Person person = new Person( "ABC-123" );
+
+			PersonDetails details = new PersonDetails();
+			details.setNickName( "John Doe" );
+
+			person.setDetails( details );
+			entityManager.persist( person );
+
+			return person;
+		} );
+
+		doInJPA( this::entityManagerFactory, entityManager -> {
+			Person person = entityManager.find( Person.class, _person.getId() );
+
+			PersonDetails details = entityManager.find( PersonDetails.class, _person.getId() );
+		} );
+	}
+
+	@Entity(name = "Person")
+	public static class Person  {
+
+		@Id
+		private String id;
+
+		@OneToOne(mappedBy = "person", cascade = CascadeType.PERSIST, optional = false)
+		private PersonDetails details;
+
+		public Person() {}
+
+		public Person(String id) {
+			this.id = id;
+		}
+
+		public String getId() {
+			return id;
+		}
+
+		public void setId(String id) {
+			this.id = id;
+		}
+
+		public void setDetails(PersonDetails details) {
+			this.details = details;
+			details.setPerson( this );
+		}
+	}
+
+	@Entity(name = "PersonDetails")
+	public static class PersonDetails  {
+
+		@Id
+		private String id;
+
+		private String nickName;
+
+		@OneToOne
+		@MapsId
+		@JoinColumn(name = "person_id")
+		private Person person;
+
+		public String getNickName() {
+			return nickName;
+		}
+
+		public void setNickName(String nickName) {
+			this.nickName = nickName;
+		}
+
+		public Person getPerson() {
+			return person;
+		}
+
+		public void setPerson(Person person) {
+			this.person = person;
+		}
+	}
+
+}

hibernate-core/src/test/java/org/hibernate/test/onetoone/optional/BidirectionalOptionalOneToOneTest.java

@@ -34,7 +34,6 @@ public class BidirectionalOptionalOneToOneTest
 	}
 
 	@Test
-	@FailureExpected( jiraKey = "HHH-9460" )
 	public void test() {
 
 		doInJPA( this::entityManagerFactory, entityManager -> {