package your.package;
@Retention(RetentionPolicy.RUNTIME)
public @interface InjectDynamicObject {
}

@Service
public class CustomerServiceImpl {
    private Customer dynamicCustomerWithAspect;
    @InjectDynamicObject
    public Customer getDynamicCustomerWithAspect() {
        return this.dynamicCustomerWithAspect;
    }
}

@Component
@Aspect
public class DynamicObjectAspect {
    // This comes from the property file
    @Value("${dynamic.object.name}")
    private String object;
    @Autowired
    private ApplicationContext applicationContext;
    @Pointcut("execution(@com.lofi.springbean.dynamic.
        InjectDynamicObject * *(..))")
    public void beanAnnotatedWithInjectDynamicObject() {
    }
    @Around("beanAnnotatedWithInjectDynamicObject()")
    public Object adviceBeanAnnotatedWithInjectDynamicObject(
        ProceedingJoinPoint pjp) throws Throwable {
        pjp.proceed();
        // Create the bean or object depends on the property file
        Object createdObject = applicationContext.getBean(object);
        return createdObject;
    }
}

@Component("customerOne")
public class CustomerOneImpl implements Customer {
    @Override
    public String getName() {
        return "Customer One";
    }
}
application.properties
dynamic.object.name=customerOne

@RunWith(SpringRunner.class)
@SpringBootTest
public class CustomerServiceImplTest {
    @Autowired
    private CustomerServiceImpl customerService;
    @Test
    public void testGetDynamicCustomerWithAspect() {
        // Dynamic object creation
        logger.info("Dynamic Customer with Aspect: " +
            customerService.getDynamicCustomerWithAspect()
            .getName());
}

@Service
public class CustomerServiceImpl {
    // We inject the customer implementations into a Map
    @Autowired
    private Map<String, Customer> dynamicCustomerWithMap;
    // This comes from the property file as a key for the Map
    @Value("${dynamic.object.name}")
    private String object;
    public Customer getDynamicCustomerWithMap() {
        return this.dynamicCustomerWithMap.get(object);
    }
}