Create a Java class named ApplicationConfig with the following code in the com.packtpub.book.ch02.springsecurity.config package:

@Configuration
@PropertySource("classpath:mysqldb.properties")
public class ApplicationConfig {

   @Autowired
   private Environment env;

   @Bean
   public DataSource getDataSource() {
       BasicDataSource dataSource = new BasicDataSource();
       dataSource.setDriverClassName(env.getProperty("mysql.driver"));
       dataSource.setUrl(env.getProperty("mysql.jdbcUrl"));
       dataSource.setUsername(env.getProperty("mysql.username"));
       dataSource.setPassword(env.getProperty("mysql.password"));
       return dataSource;
   }
}