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1-dependency-injection.asciidoc

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Table of Contents

Dependency-Injection

We want to play around with spring and test dependency-injection. Therefore we create packages, interfaces, and classes as in the following diagram:

Dependency Injection

So the idea is as followin:

  • We create two components: CompoentA and ComponentB

  • ComponentB can say hi to a given name by returning "Hello " + name

  • ComponentA uses ComponentB to return a greeting (e.g. return sayHi("World"))

  • Each component has an interface and an implementation

  • Implementation is annotated with @Named

  • ComponentAImpl uses ComponentB and gets it via @Inject annotation.

  • Write a JUnit test ComponentATest that verifies the expected result of greet()

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