how to get multiple instances of same bean in spring?

First you'll have to make MyService a Spring bean. You can do this by annotating the class with @Component. Next, as you say, Spring beans are Singletons by default, so this can be changed with one more annotation - @Scope("prototype").

A prototype bean scope means that each time you ask Spring for an instance of the bean, a new instance will be created. This applies to Autowiring, asking the application context for the bean with getBean(), or using a bean factory.

Here is a simple example of how to register a desired number of beans of the same type

@Configurationpublic class MultiBeanConfig implements ApplicationContextAware {    @Value("${bean.quantity}")    private int quantity;    @Override    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {        for (int i = 0; i < quantity; i++) {            ((ConfigurableApplicationContext)applicationContext).getBeanFactory()                    .registerSingleton("my-service-" + i, new MyService());        }        assert(applicationContext.getBeansOfType(MyService.class).size() == quantity);    }    class MyService {    }}