HHH-12064 - Issue with unidirectional one-to-many association with a join column that references a column that is not the primary key

hibernate-core/src/main/java/org/hibernate/loader/plan/exec/process/internal/CollectionReferenceInitializerImpl.java

@@ -14,7 +14,6 @@ import org.hibernate.collection.spi.PersistentCollection;
 import org.hibernate.engine.spi.PersistenceContext;
 import org.hibernate.internal.CoreLogging;
 import org.hibernate.loader.plan.exec.process.spi.CollectionReferenceInitializer;
-import org.hibernate.loader.plan.exec.process.spi.ResultSetProcessingContext;
 import org.hibernate.loader.plan.exec.spi.CollectionReferenceAliases;
 import org.hibernate.loader.plan.spi.CollectionReference;
 import org.hibernate.loader.plan.spi.Fetch;
@@ -85,6 +84,7 @@ public class CollectionReferenceInitializerImpl implements CollectionReferenceIn
 			}
 			else {
 				final Serializable optionalKey = findCollectionOwnerKey( context );
+
 				if ( optionalKey != null ) {
 					// we did not find a collection element in the result set, so we
 					// ensure that a collection is created with the owner's identifier,
@@ -138,12 +138,12 @@ public class CollectionReferenceInitializerImpl implements CollectionReferenceIn
 	}
 
 	protected Serializable findCollectionOwnerKey(ResultSetProcessingContextImpl context) {
-		ResultSetProcessingContext.EntityReferenceProcessingState ownerState = context.getOwnerProcessingState( (Fetch) collectionReference );
+		Object owner = context.getOwnerProcessingState( (Fetch) collectionReference ).getEntityInstance();
 
-		if(ownerState == null || ownerState.getEntityKey()==null){
+		return collectionReference.getCollectionPersister().getCollectionType().getKeyOfOwner(
-			return null;
+				owner,
-		}
+				context.getSession()
-		return ownerState.getEntityKey().getIdentifier();
+		);
 	}
 
 	@Override

hibernate-core/src/main/java/org/hibernate/type/CollectionType.java

@@ -46,7 +46,6 @@ import org.hibernate.persister.entity.Joinable;
 import org.hibernate.pretty.MessageHelper;
 import org.hibernate.proxy.HibernateProxy;
 import org.hibernate.proxy.LazyInitializer;
-
 import org.jboss.logging.Logger;
 
 /**
@@ -203,7 +202,7 @@ public abstract class CollectionType extends AbstractType implements Association
 			return "<uninitialized>";
 		}
 
-		final List<String> list = new ArrayList<String>();
+		final List<String> list = new ArrayList<>();
 		Type elemType = getElementType( factory );
 		Iterator itr = getElementsIterator( value );
 		while ( itr.hasNext() ) {
@@ -397,7 +396,9 @@ public abstract class CollectionType extends AbstractType implements Association
 			// NOTE VERY HACKISH WORKAROUND!!
 			// TODO: Fix this so it will work for non-POJO entity mode
 			Type keyType = getPersister( session ).getKeyType();
-			if ( !keyType.getReturnedClass().isInstance( id ) ) {
+			Class returnedClass = keyType.getReturnedClass();
+
+			if ( !returnedClass.equals( entityEntry.getPersister().getMappedClass() ) && !returnedClass.isInstance( id ) ) {
 				id = keyType.semiResolve(
 						entityEntry.getLoadedValue( foreignKeyPropertyName ),
 						session,

hibernate-core/src/test/java/org/hibernate/test/unidir/UnidirectionalOneToManyNonPkJoinColumnTest.java

@@ -0,0 +1,85 @@
+/*
+ * 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.unidir;
+
+import java.io.Serializable;
+import java.util.Arrays;
+import java.util.List;
+import javax.persistence.Entity;
+import javax.persistence.FetchType;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.OneToMany;
+import javax.persistence.Table;
+
+import org.hibernate.annotations.Fetch;
+import org.hibernate.annotations.FetchMode;
+import org.hibernate.dialect.MySQL5Dialect;
+import org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase;
+
+import org.hibernate.testing.RequiresDialect;
+import org.hibernate.testing.TestForIssue;
+import org.junit.Test;
+
+import static org.hibernate.testing.transaction.TransactionUtil.doInJPA;
+import static org.junit.Assert.assertEquals;
+
+/**
+ * @author Vlad Mihalcea
+ */
+public class UnidirectionalOneToManyNonPkJoinColumnTest extends BaseEntityManagerFunctionalTestCase {
+
+	@Override
+	protected Class<?>[] getAnnotatedClasses() {
+		return new Class<?>[] {
+			Customer.class,
+			Order.class
+		};
+	}
+
+	@Test
+	@TestForIssue( jiraKey = "HHH-12064" )
+	public void test() {
+		doInJPA( this::entityManagerFactory, entityManager -> {
+			// Save the entity on the One side
+			Customer customer = new Customer();
+			customer.idCode = "ABC";
+			customer.translationId = 1L;
+
+			entityManager.persist(customer);
+		} );
+		doInJPA( this::entityManagerFactory, entityManager -> {
+			// Attempt to load the entity saved in the previous session
+			entityManager.find(Customer.class, "ABC");
+		} );
+	}
+
+	@Entity(name = "Customer")
+	@Table(name = "tbl_customer")
+	public static class Customer implements Serializable {
+
+		@Id
+		public String idCode;
+
+		public Long translationId;
+
+		@Fetch(FetchMode.JOIN)
+		@OneToMany(fetch = FetchType.LAZY, orphanRemoval = true)
+		@JoinColumn(name = "translationId", referencedColumnName = "translationId")
+		public List<Order> translations;
+	}
+
+	@Entity(name = "Order")
+	@Table(name = "tbl_order")
+	public static class Order {
+
+		@Id
+		public long id;
+
+		public long translationId;
+	}
+}