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Asks a good question without being critical.

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where's the delete button to delete my comment?

I don't know why you think it's hard to understand. For example, for the code below:

@Autowired

private Foo foo;

Just put the cursor on "Foo" and press F4 in Eclipse, you'll see which concrete class is implementing that Foo interface. In practice only one such class should be found as Foo is probably a singleton.

He is not using Eclipse, for one. Also, it is not just about what implements that. It is more about what is USING that and what is the current implementation that is being used.

Glad it's not just me!

Spring is a producer of complexity in the name of 'configurability'.

Maybe if all you do is "hello world" apps. But for those of us who do TDD and/or DDD or just complex systems, it decreases complexity and increases maintainability. Is it tough for those who are entry level (in experience not just years)? Sure. But it all is