Hibernate example source code file (FlushAndTransactionTest.java)

This example Hibernate source code file (FlushAndTransactionTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

book, book, dummies, entitymanager, entitymanager, exception, exception, java, le, statistics, stolen, test, test, tx, util

The Hibernate FlushAndTransactionTest.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2011, 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.ejb.test.transaction;

import javax.persistence.EntityManager;
import javax.persistence.LockModeType;
import javax.persistence.OptimisticLockException;
import javax.persistence.PersistenceException;
import javax.persistence.RollbackException;
import javax.persistence.TransactionRequiredException;
import java.util.List;

import org.hibernate.Session;
import org.hibernate.ejb.HibernateEntityManagerFactory;
import org.hibernate.ejb.test.BaseEntityManagerFunctionalTestCase;
import org.hibernate.stat.Statistics;

import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

/**
 * @author Emmanuel Bernard
 */
public class FlushAndTransactionTest extends BaseEntityManagerFunctionalTestCase {
	@Test
	public void testAlwaysTransactionalOperations() throws Exception {
		Book book = new Book();
		book.name = "Le petit prince";
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		em.persist( book );
		em.getTransaction().commit();
		try {
			em.flush();
			fail( "flush has to be inside a Tx" );
		}
		catch ( TransactionRequiredException e ) {
			//success
		}
		try {
			em.lock( book, LockModeType.READ );
			fail( "lock has to be inside a Tx" );
		}
		catch ( TransactionRequiredException e ) {
			//success
		}
		em.getTransaction().begin();
		em.remove( em.find( Book.class, book.id ) );
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testTransactionalOperationsWhenExtended() throws Exception {
		Book book = new Book();
		book.name = "Le petit prince";
		EntityManager em = getOrCreateEntityManager();
		Statistics stats = ( ( HibernateEntityManagerFactory ) entityManagerFactory() ).getSessionFactory().getStatistics();
		stats.clear();
		stats.setStatisticsEnabled( true );

		em.persist( book );
		assertEquals( 0, stats.getEntityInsertCount() );
		em.getTransaction().begin();
		em.flush();
		em.getTransaction().commit();
		assertEquals( 1, stats.getEntityInsertCount() );

		em.clear();
		book.name = "Le prince";
		book = em.merge( book );

		em.refresh( book );
		assertEquals( 0, stats.getEntityUpdateCount() );
		em.getTransaction().begin();
		em.flush();
		em.getTransaction().commit();
		assertEquals( 0, stats.getEntityUpdateCount() );

		book.name = "Le prince";
		em.getTransaction().begin();
		em.find( Book.class, book.id );
		em.getTransaction().commit();
		assertEquals( 1, stats.getEntityUpdateCount() );

		em.remove( book );
		assertEquals( 0, stats.getEntityDeleteCount() );
		em.getTransaction().begin();
		em.flush();
		em.getTransaction().commit();
		assertEquals( 1, stats.getEntityDeleteCount() );

		em.close();
		stats.setStatisticsEnabled( false );
	}

	@Test
	public void testMergeWhenExtended() throws Exception {
		Book book = new Book();
		book.name = "Le petit prince";
		EntityManager em = getOrCreateEntityManager();
		Statistics stats = ( ( HibernateEntityManagerFactory ) entityManagerFactory() ).getSessionFactory().getStatistics();

		em.getTransaction().begin();
		em.persist( book );
		assertEquals( 0, stats.getEntityInsertCount() );
		em.getTransaction().commit();

		em.clear(); //persist and clear
		stats.clear();
		stats.setStatisticsEnabled( true );

		Book bookReloaded = em.find( Book.class, book.id );

		book.name = "Le prince";
		assertEquals( "Merge should use the available entiies in the PC", em.merge( book ), bookReloaded );
		assertEquals( book.name, bookReloaded.name );

		assertEquals( 0, stats.getEntityDeleteCount() );
		assertEquals( 0, stats.getEntityInsertCount() );
		assertEquals( "Updates should have been queued", 0, stats.getEntityUpdateCount() );

		em.getTransaction().begin();
		Book bookReReloaded = em.find( Book.class, bookReloaded.id );
		assertEquals( "reload should return the object in PC", bookReReloaded, bookReloaded );
		assertEquals( bookReReloaded.name, bookReloaded.name );
		em.getTransaction().commit();

		assertEquals( 0, stats.getEntityDeleteCount() );
		assertEquals( 0, stats.getEntityInsertCount() );
		assertEquals( "Work on Tx should flush", 1, stats.getEntityUpdateCount() );

		em.getTransaction().begin();
		em.remove( bookReReloaded );
		em.getTransaction().commit();

		em.close();
		stats.setStatisticsEnabled( false );
	}

	@Test
	public void testCloseAndTransaction() throws Exception {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		Book book = new Book();
		book.name = "Java for Dummies";
		em.close();

		assertFalse( em.isOpen() );
		try {
			em.flush();
			fail( "direct action on a closed em should fail" );
		}
		catch ( IllegalStateException e ) {
			//success
			em.getTransaction().rollback();
		}
	}

	@Test
	public void testTransactionCommitDoesNotFlush() throws Exception {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		Book book = new Book();
		book.name = "Java for Dummies";
		em.persist( book );
		em.getTransaction().commit();
		em.close();
		em = getOrCreateEntityManager();
		em.getTransaction().begin();
		List result = em.createQuery( "select book from Book book where book.name = :title" ).
				setParameter( "title", book.name ).getResultList();
		assertEquals( "EntityManager.commit() should trigger a flush()", 1, result.size() );
		em.getTransaction().commit();
		em.close();
	}

	@Test
	public void testTransactionAndContains() throws Exception {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		Book book = new Book();
		book.name = "Java for Dummies";
		em.persist( book );
		em.getTransaction().commit();
		em.close();
		em = getOrCreateEntityManager();
		em.getTransaction().begin();
		List result = em.createQuery( "select book from Book book where book.name = :title" ).
				setParameter( "title", book.name ).getResultList();
		assertEquals( "EntityManager.commit() should trigger a flush()", 1, result.size() );
		assertTrue( em.contains( result.get( 0 ) ) );
		em.getTransaction().commit();
		assertTrue( em.contains( result.get( 0 ) ) );
		em.close();
	}

	@Test
	public void testRollbackOnlyOnPersistenceException() throws Exception {
		Book book = new Book();
		book.name = "Stolen keys";
		book.id = null; //new Integer( 50 );
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		try {
			em.persist( book );
			em.flush();
			em.clear();
			book.setName( "kitty kid" );
			em.merge( book );
			em.flush();
			em.clear();
			book.setName( "kitty kid2" ); //non updated version
			em.merge( book );
			em.flush();
			fail( "optimistic locking exception" );
		}
		catch ( PersistenceException e ) {
			//success
		}
		try {
			em.getTransaction().commit();
			fail( "Commit should be rollbacked" );
		}
		catch ( RollbackException e ) {
			//success
		}
		finally {
			em.close();
		}
	}

	@Test
	public void testRollbackExceptionOnOptimisticLockException() throws Exception {
		Book book = new Book();
		book.name = "Stolen keys";
		book.id = null; //new Integer( 50 );
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		em.persist( book );
		em.flush();
		em.clear();
		book.setName( "kitty kid" );
		em.merge( book );
		em.flush();
		em.clear();
		book.setName( "kitty kid2" ); //non updated version
		em.unwrap( Session.class ).update( book );
		try {
			em.getTransaction().commit();
			fail( "Commit should be rollbacked" );
		}
		catch ( RollbackException e ) {
			assertTrue(
					"During flush a StateStateException is wrapped into a OptimisticLockException",
					e.getCause() instanceof OptimisticLockException
			);
		}
		finally {
			em.close();
		}

	}

	@Test
	public void testRollbackClearPC() throws Exception {
		Book book = new Book();
		book.name = "Stolen keys";
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		em.persist( book );
		em.getTransaction().commit();
		em.getTransaction().begin();
		book.name = "Recovered keys";
		em.merge( book );
		em.getTransaction().rollback();
		assertEquals( "Stolen keys", em.find( Book.class, book.id ).name );
		em.close();
	}

	@Override
	public Class[] getAnnotatedClasses() {
		return new Class[] {
				Book.class
		};
	}
}