Spring provides some stereotype annotations, among them, @Service and @Repository are special cases of @Component for specific purposes. By annotating component classes with @Service, @Repository, your classes are more clear, thus, Spring will automatically scan and import those beans into the container, so we don’t need to define them using XML.
This tutorial show you overview of Repository Pattern & a Service Layer, as well as difference between @Service & @Repository.
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At the Core of Spring Framework, Spring IoC (Inversion of Control) is implemented using the Dependency Injection design pattern. The Spring IoC Container creates, configures and connects the objects (which are called Beans), then manage their life cycle.
This tutorial introduce principle of Spring IoC and a simple example using Containers to you.
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