@Component
@Profile("dev")
public class DevDatasourceConfig

@Component
@Profile("!dev")
public class DevDatasourceConfig

<beans profile="dev">
  <bean id="devDatasourceConfig"
    class="com.okdevtv.profiles.DevDatasourceConfig" />
</beans>

@Configuration
public class MyWebApplicationInitializer implements WebApplicationInitializer {

  @Override
  public void onStartup(ServletContext servletContext) throws ServletException {
    servletContext.setInitParameter("spring.profiles.active", "dev");
  }
}

@Autowired
private ConfigurableEnvironment env;
// ...
env.setActiveProfiles("someProfile");

@ActiveProfiles("dev")