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Tiny Dependency Injection Container

In software engineering, Dependency Injection is a technique in which an object receives other objects it depends on. An article about Dependency Injection on Wikipedia

So, this task is about implementation of a tiny dependency injection container using all the knowledge gathered while solving other tasks included into this collection of exercises.

Project goals

The main goal of this project is to make you aware of dependency inversion principle and dependency injection in common. The following things need to be implemented:

  • A service that is responsible for loading component definitions described in the XML file - so, it should be something like a bean-definition reader.
  • Another service that is responsible for creating instances of described components. There should be possible getting an instance based on its name, class or interface names.

Recommended technologies

You may follow next ideas to simplify the development:

  • Use JAXB for reading bean definitions.
  • Use Reflection API to create instances.

Starting points

The following points can be considered as good starting points:

  • An ApplicationContext interface can be used as an entry point to the whole container - it can delegate reading of bean definitions from resource files to the separate component and on the other hand delegate creation of the instances to another component.