Hibernate example source code file (JPAProxyTest.java)

This example Hibernate source code file (JPAProxyTest.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

abstractjpatest, assertionfailederror, entitynotfoundexception, entitynotfoundexception, item, item, jpaproxytest, long, long, session, test, throwable, throwable, transaction

The Hibernate JPAProxyTest.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.test.jpa.proxy;

import javax.persistence.EntityNotFoundException;

import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.Transaction;

import org.junit.Test;
import junit.framework.AssertionFailedError;

import org.hibernate.test.jpa.AbstractJPATest;
import org.hibernate.test.jpa.Item;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.fail;

/**
 * Test relation between proxies and get()/load() processing
 * and make sure the interactions match the ejb3 expectations
 *
 * @author Steve Ebersole
 */
public class JPAProxyTest extends AbstractJPATest {
	@Test
	public void testEjb3ProxyUsage() {
		Session s = openSession();
		Transaction txn = s.beginTransaction();

		Item item = ( Item ) s.load( Item.class, new Long(-1) );
		assertFalse( Hibernate.isInitialized( item ) );
		try {
			Hibernate.initialize( item );
			fail( "proxy access did not fail on non-existent proxy" );
		}
		catch ( EntityNotFoundException e ) {
			// expected behavior
		}
		catch ( Throwable t ) {
			fail( "unexpected exception type on non-existent proxy access : " + t );
		}

		s.clear();

		Item item2 = ( Item ) s.load( Item.class, new Long(-1) );
		assertFalse( Hibernate.isInitialized( item2 ) );
		assertFalse( item == item2 );
		try {
			item2.getName();
			fail( "proxy access did not fail on non-existent proxy" );
		}
		catch ( EntityNotFoundException e ) {
			// expected behavior
		}
		catch ( Throwable t ) {
			fail( "unexpected exception type on non-existent proxy access : " + t );
		}

		txn.commit();
		s.close();
	}

	/**
	 * The ejb3 find() method maps to the Hibernate get() method
	 */
	@Test
	public void testGetSemantics() {
		Long nonExistentId = new Long( -1 );
		Session s = openSession();
		Transaction txn = s.beginTransaction();
		Item item = ( Item ) s.get( Item.class, nonExistentId );
		assertNull( "get() of non-existent entity did not return null", item );
		txn.commit();
		s.close();

		s = openSession();
		txn = s.beginTransaction();
		// first load() it to generate a proxy...
		item = ( Item ) s.load( Item.class, nonExistentId );
		assertFalse( Hibernate.isInitialized( item ) );
		// then try to get() it to make sure we get an exception
		try {
			s.get( Item.class, nonExistentId );
			fail( "force load did not fail on non-existent entity" );
		}
		catch ( EntityNotFoundException e ) {
			// expected behavior
		}
		catch( AssertionFailedError e ) {
			throw e;
		}
		catch ( Throwable t ) {
			fail( "unexpected exception type on non-existent entity force load : " + t );
		}
		txn.commit();
		s.close();
	}
}