The days of using MySQL, DB2, PostgreSQL etc for development is over.. I don’t know why any programmer would be developing using them..

Every deveroper should be running some in memory database like HSQLDB as part of the project for development and testing then move the a full size database for unit testing, staging and production.

This is a sample Spring Project to show how to use JavaConfig and HSQLDB. This example also will show how to use @PropertySource for reading properties and using the Environment Object to add properties to your objects.

How to use Spring JavaConfig and not XML files for configuation

Consider replacing Spring XML configuration with JavaConfig

Using Spring XML configuration is so 2000’s the time has come to push the XML away and look at JavaConfig.

Here is the main code to my sample project

public class Main
{

    private static final Logger LOGGER = getLogger(Main.class);

    public static void main(String[] args)
    {
        // in this setup, both the main(String[]) method and the JUnit method both specify that
        ApplicationContext context = new AnnotationConfigApplicationContext( DatabaseConfiguration.class );

        MessageService mService = context.getBean(MessageService.class);

        /**
         *   Saving Message to database
         */
        Message message = new Message();
        message.setMessage("Hello World");
        mService.SaveMessage(message);
        /**
         * Saving 2nd Message in database.
         */
        message.setMessage("I love NYC");
        mService.SaveMessage(message);

        /**
         * Getting messages from database
         *    - display number of message(s)
         *    - display each message in database
         */
        List<Message> myList = mService.listMessages();
        LOGGER.debug("You Have " + myList.size() + " Message(s) In The Database");

        for (Message i : myList)
        {
            LOGGER.debug("Message: ID: " + i.getId() + ", Message: " + i.getMessage() + ".");
        }
    }
}

Now lets take a look at how I setup the database in JavaConfig and not in a XML file.

@Configuration
@EnableTransactionManagement
@ComponentScan(basePackageClasses = {Main.class})
@PropertySource("classpath:application.properties")
public class DatabaseConfiguration
{
@Bean
public DataSourceInitializer dataSourceInitializer(DataSource dataSource) {
    ResourceDatabasePopulator resourceDatabasePopulator = new ResourceDatabasePopulator();
    resourceDatabasePopulator.addScript(new ClassPathResource("/schema.sql"));

        DataSourceInitializer dataSourceInitializer = new DataSourceInitializer();
        dataSourceInitializer.setDataSource(dataSource);
        dataSourceInitializer.setDatabasePopulator(resourceDatabasePopulator);
        return dataSourceInitializer;
    }

    @Bean
    public DataSource hsqlDataSource() {
        BasicDataSource basicDataSource = new BasicDataSource();
        basicDataSource.setDriverClassName(org.hsqldb.jdbcDriver.class.getName());
        basicDataSource.setUsername("sa");
        basicDataSource.setPassword("");
        basicDataSource.setUrl("jdbc:hsqldb:mem:mydb");
        return basicDataSource;
    }

    @Bean
    public LocalSessionFactoryBean sessionFactory(Environment environment,
                                              DataSource dataSource) {

        String packageOfModelBeans = Message.class.getPackage().getName();
        LocalSessionFactoryBean factoryBean = new LocalSessionFactoryBean();
        factoryBean.setDataSource(dataSource);
        factoryBean.setHibernateProperties(buildHibernateProperties(environment));
        factoryBean.setPackagesToScan(packageOfModelBeans);
        return factoryBean;
    }

    protected Properties buildHibernateProperties(Environment env) {
        Properties hibernateProperties = new Properties();

        hibernateProperties.setProperty("hibernate.dialect", env.getProperty("hibernate.dialect"));
        hibernateProperties.setProperty("hibernate.show_sql", env.getProperty("hibernate.show_sql"));
        hibernateProperties.setProperty("hibernate.use_sql_comments", env.getProperty("hibernate.use_sql_comments"));
        hibernateProperties.setProperty("hibernate.format_sql", env.getProperty("hibernate.format_sql"));
        hibernateProperties.setProperty("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));

        hibernateProperties.setProperty("hibernate.generate_statistics", env.getProperty("hibernate.generate_statistics"));

        hibernateProperties.setProperty("javax.persistence.validation.mode", env.getProperty("javax.persistence.validation.mode"));

        //Audit History flags
        hibernateProperties.setProperty("org.hibernate.envers.store_data_at_delete", env.getProperty("org.hibernate.envers.store_data_at_delete"));
        hibernateProperties.setProperty("org.hibernate.envers.global_with_modified_flag", env.getProperty("org.hibernate.envers.global_with_modified_flag"));

        return hibernateProperties;
    }

    @Bean
    public HibernateTransactionManager hibernateTransactionManager(SessionFactory sessionFactory) {
        return new HibernateTransactionManager(sessionFactory);
    }
}

You can see how easy it is to use JavaConfig and Not XML.. The time of using XML files with Springs is over…

Down and Run Project

If you would like to download the project from GitHub and run it just follow the following commands:

git clone git@github.com:JohnathanMarkSmith/NoMySQL.git
cd NoMySQL
mvn package
cd target
java -jar NoMySQL.jar

Thats it and you should see the following line on the console:

2013-04-30 10:47:17,790 [main] DEBUG com.johnathanmarksmith.noMySQL.Main - You Have 2 Message(s) In The Database
2013-04-30 10:47:17,790 [main] DEBUG com.johnathanmarksmith.noMySQL.Main - Message: ID: 1, Message: Hello World.
2013-04-30 10:47:17,790 [main] DEBUG com.johnathanmarksmith.noMySQL.Main - Message: ID: 2, Message: I love NYC.

This Project is using Java, Spring, Hibernate, Maven, jUnit, Log4J, HSQLDB and Github.

LIFE IS SO EASY WORKING WITH GIT, MAVEN, SPRING….

If you have any questions or comments please email me at john@johnathanmarksmith.com

http://JohnathanMarkSmith.com