HHH-7524 - Enabling AvailableSettings.ENABLE_LAZY_LOAD_NO_TRANS results in leaking DB-connections

(cherry picked from commit 52336f4150)

hibernate-core/src/main/java/org/hibernate/collection/internal/AbstractPersistentCollection.java

@@ -512,25 +512,20 @@ public abstract class AbstractPersistentCollection implements Serializable, Pers
 	 *
 	 * @throws LazyInitializationException if we cannot initialize
 	 */
-	protected final void initialize(boolean writing) {
-		if ( !initialized ) {
-			if ( initializing ) {
-				throw new LazyInitializationException( "illegal access to loading collection" );
+	protected final void initialize(final boolean writing) {
+		if ( initialized ) {
+			return;
 		}
-			else if ( session == null ) {
-				throw new LazyInitializationException( "could not initialize proxy - no Session" );
-			}
-			else if ( !session.isOpen() ) {
-				throw new LazyInitializationException( "could not initialize proxy - the owning Session was closed" );
-			}
-			else if ( !session.isConnected() ) {
-				throw new LazyInitializationException( "could not initialize proxy - the owning Session is disconnected" );
-			}
-			else {
-				throwLazyInitializationExceptionIfNotConnected();
-				session.initializeCollection( this, writing );
+
+		withTemporarySessionIfNeeded(
+				new LazyInitializationWork<Object>() {
+					@Override
+					public Object doWork() {
+						session.initializeCollection( AbstractPersistentCollection.this, writing );
+						return null;
 					}
 				}
+		);
 	}
 
 	private void throwLazyInitializationExceptionIfNotConnected() {

hibernate-core/src/test/java/org/hibernate/test/ondemandload/Inventory.java

@@ -21,22 +21,19 @@
  * 51 Franklin Street, Fifth Floor
  * Boston, MA  02110-1301  USA
  */
-package org.hibernate.test.annotations.derivedidentities.e1.b.specjmapid.ondemand;
+package org.hibernate.test.ondemandload;
 
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.Id;
 import javax.persistence.JoinColumn;
 import javax.persistence.ManyToOne;
-import javax.persistence.OneToMany;
-import javax.persistence.Table;
 
 import java.math.BigDecimal;
 
 import org.hibernate.annotations.GenericGenerator;
 
 @Entity
-@Table(name = "O_CUSTINVENTORY")
 public class Inventory {
 	private int id = -1;
 	private Store store;

hibernate-core/src/test/java/org/hibernate/test/ondemandload/LazyLoadingTest.java

@@ -20,27 +20,26 @@
   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
   */
 
-package org.hibernate.test.annotations.derivedidentities.e1.b.specjmapid.ondemand;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertTrue;
+package org.hibernate.test.ondemandload;
 
 import java.math.BigDecimal;
-import java.util.List;
 
 import org.hibernate.Hibernate;
 import org.hibernate.Session;
 import org.hibernate.cfg.Configuration;
 import org.hibernate.cfg.Environment;
 
-import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;
-
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 
+import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
 public class LazyLoadingTest extends BaseCoreFunctionalTestCase {
 
 	@Before
@@ -96,6 +95,21 @@ public class LazyLoadingTest extends BaseCoreFunctionalTestCase {
 		assertEquals( 2, sessionFactory().getStatistics().getSessionOpenCount() );
 		assertEquals( 1, sessionFactory().getStatistics().getSessionCloseCount() );
 
+		s.clear();
+		store = (Store) s.get( Store.class, 1 );
+		assertNotNull( store );
+		assertFalse( Hibernate.isInitialized( store.getInventories() ) );
+
+		assertEquals( 2, sessionFactory().getStatistics().getSessionOpenCount() );
+		assertEquals( 1, sessionFactory().getStatistics().getSessionCloseCount() );
+
+		s.clear();
+		store.getInventories().iterator();
+		assertTrue( Hibernate.isInitialized( store.getInventories() ) );
+
+		assertEquals( 3, sessionFactory().getStatistics().getSessionOpenCount() );
+		assertEquals( 2, sessionFactory().getStatistics().getSessionCloseCount() );
+
 		s.getTransaction().commit();
 		s.close();
 	}
@@ -156,10 +170,6 @@ public class LazyLoadingTest extends BaseCoreFunctionalTestCase {
 		assertEquals( 2, sessionFactory().getStatistics().getSessionCloseCount() );
 	}
 
-	public LazyLoadingTest() {
-		System.setProperty( "hibernate.enable_specj_proprietary_syntax", "true" );
-	}
-
 	@Override
 	protected void configure(Configuration cfg) {
 		super.configure( cfg );
@@ -169,6 +179,11 @@ public class LazyLoadingTest extends BaseCoreFunctionalTestCase {
 
 	@Override
 	protected Class[] getAnnotatedClasses() {
-		 return new Class[] { Store.class, Inventory.class, Product.class };
+		return new Class[] {
+				Store.class,
+				Inventory.class,
+				Product.class
+		};
 	}
+
 }

hibernate-core/src/test/java/org/hibernate/test/ondemandload/Product.java

@@ -21,7 +21,7 @@
  * 51 Franklin Street, Fifth Floor
  * Boston, MA  02110-1301  USA
  */
-package org.hibernate.test.annotations.derivedidentities.e1.b.specjmapid.ondemand;
+package org.hibernate.test.ondemandload;
 
 import javax.persistence.Entity;
 import javax.persistence.Id;

hibernate-core/src/test/java/org/hibernate/test/ondemandload/Store.java

@@ -21,7 +21,7 @@
  * 51 Franklin Street, Fifth Floor
  * Boston, MA  02110-1301  USA
  */
-package org.hibernate.test.annotations.derivedidentities.e1.b.specjmapid.ondemand;
+package org.hibernate.test.ondemandload;
 
 import javax.persistence.CascadeType;
 import javax.persistence.Column;