![]() When a constructor of a class is called, the instance variables do not contain their values yet. ![]() They are known in the Spring context and can be used for injection. The classes of which instances are acquired, also have to be known to the Spring framework (to be picked up by the ComponentScan) so they require some Spring annotation such as Spring manages the life-cycle of instances of those classes. You can use the annotation to tweak this behavior if you need to. In Spring Boot the provides this functionality. ![]() How does it know which classes can provide instances? The Spring Framework does this by performing a scan of components when the application starts. This causes m圜lass to automagically be assigned an instance of M圜lass if certain requirements are met. What this annotation basically does is provide an instance of a class when you request it in for example an instance variable of another class. Introduction Spring 2.5 (2007), a new feature became available, namely the annotation. Do note that since I do not have a long history with Spring, the provided solutions might not be the best ones. In this blog I’ll explain the issues and possible solutions. When I started working with Spring a while ago (actually Spring Boot to develop microservices) I encountered some challenges related to dependency injection and using the annotation. ![]() ![]() Spring is a powerful framework, but it requires some skill to use efficiently. ![]()
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