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Singleton design pattern vs Singleton beans in Spring container


Singleton design pattern vs Singleton beans in Spring container

By : jm8741
Date : January 10 2021, 01:57 PM
wish helps you A singleton bean in Spring and the singleton pattern are quite different. Singleton pattern says that one and only one instance of a particular class will ever be created per classloader.
The scope of a Spring singleton is described as "per container per bean". It is the scope of bean definition to a single object instance per Spring IoC container. The default scope in Spring is Singleton.
code :


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Is this design of Spring singleton beans thread safe?

Is this design of Spring singleton beans thread safe?


By : user3209295
Date : March 29 2020, 07:55 AM
hope this fix your issue
Is it correct to say that the DocumentService class is immutable since it's not possible to mutate any of its two fields (which are spring beans that can be initialized only once by the container itself)?
Regarding spring container eagerly singleton design pattern

Regarding spring container eagerly singleton design pattern


By : Jawad Khoury
Date : March 29 2020, 07:55 AM
like below fixes the issue If you want BeanFactory to grab beans from Spring context, then I'd suggest you to implement BeanFactoryAware, It would stay singleton & eagerly loaded
code :
public class BeanManager implements BeanFactoryAware {

  private BeanFactory beanFactory;

  public Person getPerson(){ beanFactory.getBean(Person.class) ;}   

}
Spring Singleton Vs Singleton Design pattern - Class Loader

Spring Singleton Vs Singleton Design pattern - Class Loader


By : Joseph Van
Date : March 29 2020, 07:55 AM
Any of those help Well, the real difference is not around class loading, but it's about the design principle. Singleton pattern has it's own limitations. It exposes an object globally as well as it's difficult to test. But, singleton through DI framework like Spring or Guice is free from those problems.
This SO thread may help you to understand. As well as Google-singleton-detector and Misko Hevery's blog are also interesting read.
Does spring always create a new IOC container for each new client if not then how does it manage the singleton beans?

Does spring always create a new IOC container for each new client if not then how does it manage the singleton beans?


By : user3590504
Date : March 29 2020, 07:55 AM
I hope this helps you . No. It will not create new IOC container for each new client. That's why bean scope is there. If you want to keep bean per request you can use request as bean scope. Singleton is not thread safe. So each new request, it will share the instance properties.
Request scope definition from documentation
Spring: How to treat prototyped beans in a spring container, singleton scoped for a certain subpart of the object graph?

Spring: How to treat prototyped beans in a spring container, singleton scoped for a certain subpart of the object graph?


By : Brian G. Motley
Date : March 29 2020, 07:55 AM
seems to work fine
If I scope Dependency as prototype, I will always get a new instance, breaching constraint 2
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