Developing Java Applications with Spring and Spring Boot

Core container

The core container is the basis of the whole Spring ecosystem and comprehends four components—core, beans, context, and expression language.

Core and beans are responsible for providing the fundamentals of the framework and dependency injection. These modules are responsible for managing the IoC container, and the principal functions are the instantiation, configuration, and destruction of the object residents in the Spring container.

Spring contexts are also called Spring IoC containers, which are responsible for instantiating, configuring, and assembling beans by reading configuration metadata from XML, Java annotations, and/or Java code in the configuration files.

There are two critical interfaces inside these modules—