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There is a newer version: 4.0.2

/*
 * Copyright (c) 1998, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     dclarke - Dynamic Persistence INCUBATION - Enhancement 200045
//               http://wiki.eclipse.org/EclipseLink/Development/Dynamic
//
// This code is being developed under INCUBATION and is not currently included
// in the automated EclipseLink build. The API in this code may change, or
// may never be included in the product. Please provide feedback through mailing
// lists or the bug database.
package org.eclipse.persistence.jpa.dynamic;

//java eXtension imports
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;

//EclipseLink imports
import org.eclipse.persistence.descriptors.ClassDescriptor;
import org.eclipse.persistence.dynamic.DynamicHelper;
import org.eclipse.persistence.dynamic.DynamicType;
import org.eclipse.persistence.jpa.JpaHelper;

/**
 *
 * @author dclarke
 * @since EclipseLink 1.2
 */
public class JPADynamicHelper extends DynamicHelper {

    public JPADynamicHelper(EntityManagerFactory emf) {
        super(JpaHelper.getServerSession(emf));
    }

    public JPADynamicHelper(EntityManager em) {
        super(JpaHelper.getEntityManager(em).getDatabaseSession());
    }

    /**
     * Add one or more EntityType instances to a session and optionally generate
     * needed tables with or without FK constraints.
     */
    public void addTypes(boolean createMissingTables, boolean generateFKConstraints, DynamicType... types) {
        super.addTypes(createMissingTables, generateFKConstraints, types);
        for (DynamicType type : types) {
            ClassDescriptor descriptor = type.getDescriptor();
            descriptor.getQueryManager().checkDatabaseForDoesExist();
        }
    }
}