HHH-18782 reproducer

orm/hibernate-orm-6/src/test/java/org/hibernate/bugs/HHH18782_JPAUnitTestCase.java

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+package org.hibernate.bugs;
+
+import static org.junit.Assert.assertSame;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.hibernate.bugs.entities.Cart;
+import org.hibernate.bugs.entities.Item;
+import org.hibernate.bugs.entities.Wheel;
+import org.hibernate.cfg.AvailableSettings;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityManagerFactory;
+import jakarta.persistence.Persistence;
+
+/**
+ * Reproducer of HHH-18782 
+ * <p>
+ * “enable_lazy_load_no_trans=true” creates new instance of parent for each lazily loaded child relation
+ * 
+ * @see <a href="https://hibernate.atlassian.net/browse/HHH-18782">HHH-18782</a>
+ */
+@JiraKey("HHH-18782")
+class HHH18782_JPAUnitTestCase {
+
+	private EntityManagerFactory entityManagerFactory;
+
+	@BeforeEach
+	void init() {
+		Map<String, String> properties = new HashMap<>();
+		properties.put(AvailableSettings.ENABLE_LAZY_LOAD_NO_TRANS, "true");
+		entityManagerFactory = Persistence.createEntityManagerFactory( "templatePU" , properties);
+	}
+
+	@AfterEach
+	void destroy() {
+		entityManagerFactory.close();
+	}
+
+	// Entities are auto-discovered, so just add them anywhere on class-path
+	// Add your tests, using standard JUnit.
+	@Test
+	void hhh18782Test_LazyLoadedChildrenHaveParentInstanceInInverseRelation() throws Exception {
+		EntityManager entityManager = entityManagerFactory.createEntityManager();
+		entityManager.getTransaction().begin();
+
+		Cart cart = new Cart();
+		cart.setCartNo("1234");
+
+		cart.addItem(createItem("1"));
+		cart.addItem(createItem("2"));
+		cart.addWheel(createWheel("no1"));
+
+		entityManager.persist(cart);
+		entityManager.flush();
+
+		Long offerId = cart.getId();
+		entityManager.clear();
+
+		Cart cartFromEm = entityManager.find(Cart.class, offerId);
+		entityManager.getTransaction().commit();
+		entityManager.close();
+
+		// lazy loading 
+
+		// Check that we load lazily - working
+		assertEquals(2, cartFromEm.getItems().size());
+		assertEquals(1, cartFromEm.getWheels().size());
+
+		// Fails from here on >>>
+		assertSame("item 0 does not have the correct parent instance", cartFromEm, cartFromEm.getItem(0).getCart());
+		assertSame("item 1 does not have the correct parent instance", cartFromEm, cartFromEm.getItem(1).getCart());
+		assertSame("wheel 0 does not have the correct parent instance", cartFromEm, cartFromEm.getWheel(0).getCart());
+	}
+
+	private Item createItem(String itemNo) {
+		Item item = new Item();
+		item.setItemNo(itemNo);
+		return item;
+	}
+
+	private Wheel createWheel(String wheelNo) {
+		Wheel wheel = new Wheel();
+		wheel.setWheelNo(wheelNo);
+		return wheel;
+	}
+
+}

orm/hibernate-orm-6/src/test/java/org/hibernate/bugs/entities/Cart.java

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+package org.hibernate.bugs.entities;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.OrderBy;
+import jakarta.persistence.SequenceGenerator;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name="CART")
+public class Cart {
+
+    @Id
+    @GeneratedValue(generator = "CartSeq", strategy = GenerationType.SEQUENCE)
+    @SequenceGenerator(name = "CartSeq", sequenceName = "CART_SEQ", allocationSize = 50)
+    private Long id;
+
+	@OneToMany(fetch = FetchType.LAZY, mappedBy = "cart", targetEntity = Item.class, orphanRemoval = true, cascade = CascadeType.ALL)
+	private List<Item> items = new ArrayList<>();
+
+	@OneToMany(fetch = FetchType.LAZY, mappedBy = "cart", targetEntity = Wheel.class, orphanRemoval = true, cascade = CascadeType.ALL)
+	private List<Wheel> wheels = new ArrayList<>();
+
+	@Column(name = "CART_NO", length = 255)
+	private String cartNo;
+
+	public List<Item> getItems() {
+		return items;
+	}
+
+	public Item getItem(int index) {
+		return items.get(index);
+	}
+
+	public void addItem(Item objectToAdd) {
+        if (objectToAdd == null) {
+            throw new NullPointerException("Can't add null to association Items of " + this);
+        }
+        if (items.contains(objectToAdd)) {
+            return;
+        }
+        objectToAdd.setCartInternal(this);
+        items.add(objectToAdd);
+	}
+
+    public void removeItem(Item objectToRemove) {
+        if (objectToRemove == null) {
+            return;
+        }
+        if (items.remove(objectToRemove)) {
+            objectToRemove.setCartInternal(null);
+        }
+    }
+
+	public void addWheel(Wheel objectToAdd) {
+        if (objectToAdd == null) {
+            throw new NullPointerException("Can't add null to association Wheels of " + this);
+        }
+        if (getWheels().contains(objectToAdd)) {
+            return;
+        }
+        objectToAdd.setCartInternal(this);
+        getWheels().add(objectToAdd);
+	}
+
+    public void removeWheel(Wheel objectToRemove) {
+        if (objectToRemove == null) {
+            return;
+        }
+        if (getWheels().remove(objectToRemove)) {
+            objectToRemove.setCartInternal(null);
+        }
+    }
+
+	public List<Wheel> getWheels() {
+		return wheels;
+	}
+
+	public Wheel getWheel(int index) {
+		return wheels.get(index);
+	}
+
+	public String getCartNo() {
+		return cartNo;
+	}
+
+	public void setCartNo(String orderNo) {
+		this.cartNo = orderNo;
+	}
+
+	public Long getId() {
+		return id;
+	}
+
+}

orm/hibernate-orm-6/src/test/java/org/hibernate/bugs/entities/Item.java

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+package org.hibernate.bugs.entities;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.SequenceGenerator;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name="ITEM")
+public class Item {
+
+    @Id
+    @GeneratedValue(generator = "ItemSeq", strategy = GenerationType.SEQUENCE)
+    @SequenceGenerator(name = "ItemSeq", sequenceName = "ITEM_SEQ", allocationSize = 50)
+    private Long id;
+
+	@ManyToOne(fetch = FetchType.EAGER, targetEntity = Cart.class)
+    @JoinColumn(name = "CART"
+    		+ "_ID")
+	private Cart cart;
+
+	@Column(name = "ITEM_NO", length = 255)
+	private String itemNo;
+
+	/**
+	 * INTERNAL, managed via {@link Cart#addItem(OfferItem)}
+	 */
+	public void setCartInternal(Cart offer) {
+		this.cart = offer;
+	}
+
+	public Cart getCart() {
+		return cart;
+	}
+
+	public Long getId() {
+		return id;
+	}
+
+	public String getItemNo() {
+		return itemNo;
+	}
+
+	public void setItemNo(String itemNo) {
+		this.itemNo = itemNo;
+	}
+
+}

orm/hibernate-orm-6/src/test/java/org/hibernate/bugs/entities/Wheel.java

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+package org.hibernate.bugs.entities;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.SequenceGenerator;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name="WHEEL")
+public class Wheel {
+
+    @Id
+    @GeneratedValue(generator = "WheelSeq", strategy = GenerationType.SEQUENCE)
+    @SequenceGenerator(name = "WheelSeq", sequenceName = "WHEEL_SEQ", allocationSize = 50)
+    private Long id;
+
+	@ManyToOne(fetch = FetchType.EAGER, targetEntity = Cart.class)
+    @JoinColumn(name = "CART_ID")
+	private Cart cart;
+
+	@Column(name = "WHEEL_NO", length = 255)
+	private String wheelNo;
+
+	/**
+	 * INTERNAL, managed via {@link Cart#addItem(OfferItem)}
+	 */
+	public void setCartInternal(Cart offer) {
+		this.cart = offer;
+	}
+
+	public Cart getCart() {
+		return cart;
+	}
+
+	public Long getId() {
+		return id;
+	}
+
+	public String getWheelNo() {
+		return wheelNo;
+	}
+
+	public void setWheelNo(String wheelNo) {
+		this.wheelNo = wheelNo;
+	}
+
+}