How to call a method after bean initialization is complete

Question

I have a use case where I need to call a  non-static  method in the bean only-once at the ApplicationContext load up  Is it ok  if I use MethodInvokingFactoryBean for this  Or we have a some better solution   As a side note  I use ConfigContextLoaderListener to load the Application Context in web application  And want  that if bean  A  is instantiated just call methodA   once   How can this be done nicely

User · Answer

To expand on the  PostConstruct suggestion in other answers  this really is the best solution  in my opinion   It keeps your code decoupled from the Spring API   PostConstruct is in javax    It explicitly annotates your init method as something that needs to be called to initialize the bean You don t need to remember to add the init-method attribute to your spring bean definition  spring will automatically call the method  assuming you register the annotation-config option somewhere else in the context  anyway

User · Answer

Have you tried implementing InitializingBean  It sounds like exactly what you re after   The downside is that your bean becomes Spring-aware  but in most applications that s not so bad

User · Answer

There are three different approaches to consider  as described in the reference  Use init-method attribute  Pros    Does not require bean to implement an interface    Cons    No immediate indication this method is required after construction to ensure the bean is correctly configured      Implement InitializingBean  Pros    No need to specify init-method  or turn on component scanning   annotation processing   Appropriate for beans supplied with a library  where we don t want the application using this library to concern itself with bean lifecycle    Cons    More invasive than the init-method approach      Use JSR-250  PostConstruct lifecyle annotation  Pros    Useful when using component scanning to autodetect beans  Makes it clear that a specific method is to be used for initialisation  Intent is closer to the code    Cons    Initialisation no longer centrally specified in configuration  You must remember to turn on annotation processing  which can sometimes be forgotten

User · Answer

You can use something like    lt beans gt       lt bean id  myBean  class       init-method  init   gt   lt  beans gt    This will call the  init  method when the bean is instantiated

User · Answer

To further clear any confusion about the two approach i e use of    PostConstruct and init-method  init    From personal experience  I realized that using  1  only works in a servlet container  while  2  works in any environment  even in desktop applications  So  if you would be using Spring in a standalone application  you would have to use  2  to carry out that  call this method after initialization

User · Answer

You could deploy a custom BeanPostProcessor in your application context to do it  Or if you don t mind implementing a Spring interface in your bean  you could use the InitializingBean interface or the  init-method  directive  same link

[spring] How to call a method after bean initialization is complete?

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