@@ -0,0 +1,1834 @@
+/*%0A * Copyright 2016 Vladimir Kizelbashev%0A *%0A * Licensed under the Apache License, Version 2.0 (the %22License%22);%0A * you may not use this file except in compliance with the License.%0A * You may obtain a copy of the License at%0A *%0A *     http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A */%0A%0Apackage com.haulmont.testtask.hsqldb;%0A%0Aimport com.haulmont.testtask.dao.DaoException;%0A%0Aimport java.sql.SQLException;%0A%0A/**%0A * The class %7B@code DaoFactory%7D represents a DAO-factory.%0A * It creates instances of DAO for Group and Student entities.%0A *%0A * @version 1.0%0A * @author Vladimir%0A */%0Apublic class DaoFactory %7B%0A%0A    private static DaoFactory instance = null;%0A%0A    private DaoFactory() %7B%0A    %7D%0A%0A    public static synchronized DaoFactory getInstance() %7B%0A        if (instance == null) %7B%0A            instance = new DaoFactory();%0A        %7D%0A        return instance;%0A    %7D%0A%0A    public GroupDao getGroupDao() throws DaoException %7B%0A        try %7B%0A            return new GroupDao(DatabaseHelper.getConnection());%0A        %7D catch (Exception e) %7B%0A            throw new DaoException(e);%0A        %7D%0A    %7D%0A%0A    public StudentDao getStudentDao() throws DaoException %7B%0A        try %7B%0A            return new StudentDao(DatabaseHelper.getConnection());%0A        %7D catch (Exception e) %7B%0A            throw new DaoException(e);%0A        %7D%0A    %7D%0A%0A    public void releaseResources() throws DaoException %7B%0A        try %7B%0A            DatabaseHelper.closeConnection();%0A        %7D catch (SQLException e) %7B%0A            throw new DaoException(e);%0A        %7D%0A    %7D%0A%7D%0A

Add DaoFactory class