HHH-9106 : Multiple detached representations of the same entity cannot be merged

hibernate-core/src/test/java/org/hibernate/test/ops/AbstractOperationTestCase.java

@@ -39,7 +39,14 @@ public abstract class AbstractOperationTestCase extends BaseCoreFunctionalTestCa
 	}
 
 	public String[] getMappings() {
-		return new String[] { "ops/Node.hbm.xml", "ops/Employer.hbm.xml", "ops/OptLockEntity.hbm.xml", "ops/OneToOne.hbm.xml", "ops/Competition.hbm.xml" };
+		return new String[] {
+				"ops/Node.hbm.xml",
+				"ops/Employer.hbm.xml",
+				"ops/OptLockEntity.hbm.xml",
+				"ops/OneToOne.hbm.xml",
+				"ops/Competition.hbm.xml",
+				"ops/Hoarder.hbm.xml"
+		};
 	}
 
 	public String getCacheConcurrencyStrategy() {

hibernate-core/src/test/java/org/hibernate/test/ops/Category.java

@@ -0,0 +1,57 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2014, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.test.ops;
+
+/**
+ * @author Gail Badner
+ */
+public class Category {
+	private Long id;
+	private String name;
+	private Item exampleItem;
+
+	public Long getId() {
+		return id;
+	}
+
+	public void setId(Long id) {
+		this.id = id;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public Item getExampleItem() {
+		return exampleItem;
+	}
+
+	public void setExampleItem(Item exampleItem) {
+		this.exampleItem = exampleItem;
+	}
+}

hibernate-core/src/test/java/org/hibernate/test/ops/Hoarder.hbm.xml

@@ -0,0 +1,42 @@
+<?xml version="1.0"?>
+<!DOCTYPE hibernate-mapping PUBLIC
+        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
+        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
+
+<!--
+
+-->
+
+<hibernate-mapping package="org.hibernate.test.ops">
+
+    <class name="Hoarder">
+        <id name="id">
+            <generator class="native"/>
+        </id>
+        <property name="name"/>
+        <many-to-one name="favoriteItem" cascade="persist,merge,save-update" />
+        <set name="items" cascade="persist,merge,save-update">
+            <key column="HOARDER_ID"/>
+            <one-to-many class="Item" />
+        </set>
+    </class>
+
+    <class name="Item">
+        <id name="id">
+            <generator class="native"/>
+        </id>
+        <property name="name" not-null="true" />
+        <property name="description" />
+        <many-to-one name="category" cascade="persist,merge,save-update"/>
+    </class>
+
+    <class name="Category">
+        <id name="id">
+            <generator class="native"/>
+        </id>
+        <property name="name" not-null="true" />
+        <many-to-one name="exampleItem" cascade="persist,merge,save-update" />
+    </class>
+
+</hibernate-mapping>
+

hibernate-core/src/test/java/org/hibernate/test/ops/Hoarder.java

@@ -0,0 +1,69 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2014, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.test.ops;
+
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * @author Gail Badner
+ */
+public class Hoarder {
+	private Long id;
+	private String name;
+	private Item favoriteItem;
+	private Set<Item> items = new HashSet<Item>();
+
+	public Long getId() {
+		return id;
+	}
+
+	public void setId(Long id) {
+		this.id = id;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public Item getFavoriteItem() {
+		return favoriteItem;
+	}
+
+	public void setFavoriteItem(Item favoriteItem) {
+		this.favoriteItem = favoriteItem;
+	}
+
+	public Set<Item> getItems() {
+		return items;
+	}
+
+	public void setItems(Set<Item> items) {
+		this.items = items;
+	}
+}

hibernate-core/src/test/java/org/hibernate/test/ops/Item.java

@@ -0,0 +1,89 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * Copyright (c) 2014, Red Hat Inc. or third-party contributors as
+ * indicated by the @author tags or express copyright attribution
+ * statements applied by the authors.  All third-party contributions are
+ * distributed under license by Red Hat Inc.
+ *
+ * This copyrighted material is made available to anyone wishing to use, modify,
+ * copy, or redistribute it subject to the terms and conditions of the GNU
+ * Lesser General Public License, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this distribution; if not, write to:
+ * Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor
+ * Boston, MA  02110-1301  USA
+ */
+package org.hibernate.test.ops;
+
+/**
+ * @author Gail Badner
+ */
+public class Item {
+	private Long id;
+	private String name;
+	private String description;
+	private Category category;
+
+	public Long getId() {
+		return id;
+	}
+
+	public void setId(Long id) {
+		this.id = id;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public String getDescription() {
+		return description;
+	}
+
+	public void setDescription(String description) {
+		this.description = description;
+	}
+
+	public Category getCategory() {
+		return category;
+	}
+
+	public void setCategory(Category category) {
+		this.category = category;
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if ( this == o ) {
+			return true;
+		}
+		if ( o == null || getClass() != o.getClass() ) {
+			return false;
+		}
+
+		Item item = (Item) o;
+
+		if ( !name.equals( item.name ) ) {
+			return false;
+		}
+
+		return true;
+	}
+
+	@Override
+	public int hashCode() {
+		return name.hashCode();
+	}
+}

hibernate-core/src/test/java/org/hibernate/test/ops/MergeTest.java

@@ -35,6 +35,7 @@ import org.hibernate.Session;
 import org.hibernate.StaleObjectStateException;
 import org.hibernate.Transaction;
 import org.hibernate.criterion.Projections;
+import org.hibernate.testing.FailureExpected;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -493,7 +494,7 @@ public class MergeTest extends AbstractOperationTestCase {
 
 		child = (NumberedNode) root.getChildren().iterator().next();
 		grandchild = (NumberedNode) child.getChildren().iterator().next();
-		grandchild.setDescription("the grand child");
+		grandchild.setDescription( "the grand child" );
 		NumberedNode grandchild2 = new NumberedNode("grandchild2");
 		child.addChild( grandchild2 );
 
@@ -503,7 +504,7 @@ public class MergeTest extends AbstractOperationTestCase {
 		tx.commit();
 		s.close();
 
-		assertInsertCount(1);
+		assertInsertCount( 1 );
 		assertUpdateCount(1);
 		clearCounts();
 
@@ -512,7 +513,7 @@ public class MergeTest extends AbstractOperationTestCase {
 		NumberedNode child2 = new NumberedNode("child2");
 		NumberedNode grandchild3 = new NumberedNode("grandchild3");
 		child2.addChild( grandchild3 );
-		root.addChild(child2);
+		root.addChild( child2 );
 
 		s = openSession();
 		tx = s.beginTransaction();
@@ -615,19 +616,19 @@ public class MergeTest extends AbstractOperationTestCase {
 
 		tx = s.beginTransaction();
 		NumberedNode child = new NumberedNode("child");
-		root.addChild(child);
-		assertSame( root, s.merge(root) );
+		root.addChild( child );
+		assertSame( root, s.merge( root ) );
 		Object mergedChild = root.getChildren().iterator().next();
 		assertNotSame( mergedChild, child );
-		assertTrue( s.contains(mergedChild) );
+		assertTrue( s.contains( mergedChild ) );
 		assertFalse( s.contains(child) );
 		assertEquals( root.getChildren().size(), 1 );
 		assertTrue( root.getChildren().contains(mergedChild) );
 		//assertNotSame( mergedChild, s.merge(child) ); //yucky :(
 		tx.commit();
 
-		assertInsertCount(1);
-		assertUpdateCount(0);
+		assertInsertCount( 1 );
+		assertUpdateCount( 0 );
 
 		assertEquals( root.getChildren().size(), 1 );
 		assertTrue( root.getChildren().contains(mergedChild) );
@@ -651,7 +652,7 @@ public class MergeTest extends AbstractOperationTestCase {
 		Transaction tx = s.beginTransaction();
 		NumberedNode root = new NumberedNode( "root" );
 		root.addChild( new NumberedNode( "child" ) );
-		s.persist(root);
+		s.persist( root );
 		tx.commit();
 		s.close();
 
@@ -671,14 +672,14 @@ public class MergeTest extends AbstractOperationTestCase {
 		assertFalse( Hibernate.isInitialized( managedChildren ) );
 		tx.commit();
 
-		assertInsertCount(0);
-		assertUpdateCount(0);
-		assertDeleteCount(0);
+		assertInsertCount( 0 );
+		assertUpdateCount( 0 );
+		assertDeleteCount( 0 );
 
 		tx = s.beginTransaction();
 		assertEquals(
 				Long.valueOf( 2 ),
-				s.createCriteria(NumberedNode.class)
+				s.createCriteria( NumberedNode.class )
 						.setProjection( Projections.rowCount() )
 						.uniqueResult()
 		);
@@ -825,6 +826,97 @@ public class MergeTest extends AbstractOperationTestCase {
 		cleanup();
 	}
 
+	@Test
+	@FailureExpected( jiraKey = "HHH-9106")
+	public void testMergeTransientWithMultipleDetachedRepresentationOfSameEntity() {
+
+		Item item1 = new Item();
+		item1.setName( "item1" );
+		item1.setDescription( "item1 description" );
+
+		Session s = openSession();
+		Transaction tx = session.beginTransaction();
+		s.persist( item1 );
+		tx.commit();
+		s.close();
+
+		// Get 2 representations of the same Item from 3 different sessions.
+
+		s = openSession();
+		Item item1_1 = (Item) s.get( Item.class, item1.getId() );
+		s.close();
+
+		s = openSession();
+		Item item1_2 = (Item) s.get( Item.class, item1.getId() );
+		s.close();
+
+		// item1_1 and item1_2 are unmodified representations of the same persistent entity.
+		assertFalse( item1_1 == item1_2 );
+		assertTrue( item1_1.equals( item1_2 ) );
+
+		// Create a transient entity that references both representations.
+		Hoarder hoarder = new Hoarder();
+		hoarder.setName( "joe" );
+		hoarder.getItems().add( item1_1 );
+		hoarder.setFavoriteItem( item1_2 );
+
+		s = openSession();
+		tx = s.beginTransaction();
+		hoarder = (Hoarder) s.merge( hoarder );
+		assertSame( hoarder.getFavoriteItem(), hoarder.getItems().iterator().next() );
+		assertEquals( item1.getId(), hoarder.getFavoriteItem().getId() );
+		assertEquals( item1.getDescription(), hoarder.getFavoriteItem().getDescription() );
+		assertEquals( item1.getCategory(), hoarder.getFavoriteItem().getCategory() );
+		tx.commit();
+		s.close();
+	}
+
+	@Test
+	@FailureExpected( jiraKey = "HHH-9106")
+	public void testMergeDetachedWithDetachedRepresentationOfSameEntity() {
+		Item item1 = new Item();
+		item1.setName( "item1" );
+		item1.setDescription( "item1 description" );
+
+		Hoarder hoarder = new Hoarder();
+		hoarder.setName( "joe" );
+
+		Session s = openSession();
+		Transaction tx = session.beginTransaction();
+		s.persist( item1 );
+		s.persist( hoarder );
+		tx.commit();
+		s.close();
+
+		// Get 2 representations of the same Item from 3 different sessions.
+
+		s = openSession();
+		Item item1_1 = (Item) s.get( Item.class, item1.getId() );
+		s.close();
+
+		s = openSession();
+		Item item1_2 = (Item) s.get( Item.class, item1.getId() );
+		s.close();
+
+		// item1_1 and item1_2 are unmodified representations of the same persistent entity.
+		assertFalse( item1_1 == item1_2 );
+		assertTrue( item1_1.equals( item1_2 ) );
+
+		// Update hoarder (detached) to references both representations.
+		hoarder.getItems().add( item1_1 );
+		hoarder.setFavoriteItem( item1_2 );
+
+		s = openSession();
+		tx = s.beginTransaction();
+		hoarder = (Hoarder) s.merge( hoarder );
+		assertSame( hoarder.getFavoriteItem(), hoarder.getItems().iterator().next() );
+		assertEquals( item1.getId(), hoarder.getFavoriteItem().getId() );
+		assertEquals( item1.getDescription(), hoarder.getFavoriteItem().getDescription() );
+		assertEquals( item1.getCategory(), hoarder.getFavoriteItem().getCategory() );
+		tx.commit();
+		s.close();
+	}
+
 	@SuppressWarnings( {"unchecked"})
 	private void cleanup() {
 		Session s = openSession();