foundation/eclipselink.core.test/src/it/java/org/eclipse/persistence/testing/tests/directmap/DirectMapMappingHashMapTest.java

/*
 * Copyright (c) 1998, 2021 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:
//     Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.testing.tests.directmap;

import org.eclipse.persistence.sessions.UnitOfWork;
import org.eclipse.persistence.queries.ReadObjectQuery;
import org.eclipse.persistence.testing.framework.AutoVerifyTestCase;
import org.eclipse.persistence.testing.framework.TestErrorException;
import org.eclipse.persistence.testing.models.directmap.DirectMapMappings;

/**
 * Tests that null objects within a HashMap do not throw a null pointer
 * exception.
 * BUG# 4364944
 *
 * @author Guy Pelletier
 * @version 1.0
 */
public class DirectMapMappingHashMapTest extends AutoVerifyTestCase {
    private NullPointerException m_exception;
    private DirectMapMappings queryResult;

    public DirectMapMappingHashMapTest() {
        setDescription("Tests that nulls are properly supported for DirectMapMappings that use a HashMap.");
    }

    @Override
    public void reset() {
        getSession().getIdentityMapAccessor().initializeIdentityMaps();
        rollbackTransaction();
    }

    @Override
    public void setup() throws Exception {
        getSession().getIdentityMapAccessor().initializeIdentityMaps();
        beginTransaction();
    }

    @Override
    public void test() throws Exception {
        // Create a hashmap with a null in it.
        UnitOfWork uow = getSession().acquireUnitOfWork();
        DirectMapMappings maps = (DirectMapMappings)uow.registerObject(new DirectMapMappings());
        maps.directHashMap.put(1, "item1");
        maps.directHashMap.put(2, "item2");
        maps.directHashMap.put(3, null);

        try {
            uow.commit();
        } catch (NullPointerException e) {
            m_exception = e;
        }

        // Clear the cache
        getSession().getIdentityMapAccessor().initializeIdentityMaps();

        // Execute query to read back the directmapmapping from the database.
        queryResult = (DirectMapMappings)getSession().executeQuery(new ReadObjectQuery(DirectMapMappings.class));
    }

    @Override
    public void verify() throws Exception {
        if (m_exception != null) {
            throw new TestErrorException("Null pointer exception was caught.");
        }

        if (queryResult.directHashMap.size() != 3) {
            throw new TestErrorException("Incorrect amount of items in the hashmap.");
        }

        if (queryResult.directHashMap.get(3) != null) {
            throw new TestErrorException("The null value was not read back in correctly.");
        }
    }
}