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Separation of api and implementation

In every project you have to deal with apis and their implementations. While a lot of projects separate the api from it’s implementation through different java packages (mostly named internal or impl), I want to show you another approach and tell you why this approach makes more sense. I call this other approach “implementation separation by packaging artifact”. Let’s take a look at a widly used project structure that separates the api from the implementation by using a separate impl package. This kind of separation is widely used but it has a some impacts on design and api usage as I will show now. Api and implementation dependencies differ The… Read More »Separation of api and implementation

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