Java 9 Programming By Example

Spring core

The central element of the core module is the context. When a Spring application starts, the container needs a context in which the container can create different beans. This is very general and true for any dependency injection container. If we programmatically create two different contexts, they may live independent of each other in the same JVM. If there is a bean declared as a singleton so that there should be only one single instance of it, then the container will create a single instance of it for a context when we need one instance. The objects representing the context have a reference to the object that we have already created. If there are multiple contexts, however, they will not know that there is another context in ...