Spring Related Concepts

*Root and child contexts*

Before reading further, please understand that –

 - Spring can have multiple contexts at a time. One of them will be root context, and all other contexts will be child contexts.
 - All child contexts can access the beans defined in root context; but opposite is not true. Root context cannot access child contexts beans.




#ContextLoaderListener – Root application context
 - ContextLoaderListener creates the root application context and will be shared with child contexts created by all DispatcherServlet contexts. You can have only one entry of this in web.xml.

=> Generally, you will define all MVC related beans (controller and views etc) in DispatcherServlet context, and all cross-cutting beans such as security, transaction, services etc. at root context by ContextLoaderListener.