Polymorphic @configuration with @Profile

gistfile1.java

@Configuration@TxAnnotationDriven
public abstract class AppConfig {


     @Inject Environment env;


     // ---- configure data infrastructure ----

     public abstract DataSource dataSource();

     @Configuration
     @Profile("prod")
     @PropertySource("classpath:/com/company/app/db.properties")

     static class ProdConfig extends AppConfig {
          @Override
          @Bean
          public DataSource dataSource() {
               SimpleDriverDataSource dataSource = new SimpleDriverDataSource();
               dataSource.setDriverClass(env.getPropertyAsClass("db.driverClass"));
               dataSource.setUrl(env.getProperty("db.url"));
               dataSource.setUsername(env.getProperty("db.username"));
               dataSource.setPassword(env.getProperty("db.password"));
          }
     }

     @Configuration
     @Profile("dev")
     static class DevConfig extends AppConfig {
          @Override
          @Bean
          public DataSource dataSource() {
               return new EmbeddedDatabaseBuilder()
                    .setType(EmbeddedDatabaseType.HSQL)
                    .addScript("db-schema.sql")
                    .build();
          }
     }

     @Bean
     public SessionFactory sessionFactory() {
          return new AnnotationSessionFactoryBuilder()
               .setDataSource(dataSource())
               .setAnnotatedClasses(com.company.app.domain.Foo.class)
               .buildSessionFactory();
     }

     @Bean
     public PersistenceExceptionTranslationPostProcessor exceptionTranslationPostProcessor() {
          return new PersistenceExceptionTranslationPostProcessor();
     }


     @Bean
     public PersistenceExceptionTranslator exceptionTranslator() {
          return new HibernateExceptionTranslator();
     }

     @Bean
     public PlatformTransactionManager txManager() {
          return new HibernateTransactionManager(sessionFactory());
     }


     // ---- configure service and repository layers ----

     // ...


     // ---- configure MVC controllers and infrastructure ----

     // ...

}