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Asked: 2026-05-14T00:14:29+00:00

I’ve got a set of classes, namely, a data transfer object, a service implementation

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I’ve got a set of classes, namely, a data transfer object, a service implementation object, and a data access object. I currently have business logic in the service implementation object; it uses the dao to get data to populate the dto that is shipped back to the client/gui code.

The issue is that I can’t create a lightweight junit test of the service implementation object(it’s a servlet); I think the business logic should be elsewhere, but the only thing I can think of is putting business logic in the dao or in yet another layer that goes between the dao and the service implementation.

Are there other options, or am I thinking about this the wrong way?

It’s a GWT/App Engine project.

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1 Answer

  1. Editorial Team

    I don’t understand why you can’t unit-test the servlet, e.g. as per this SO question (there are others on similar themes) — can you please explain?

    Edit: if there’s no special reason, I suggest you should the business logic in the service layer (where it seems to belong) and unit-test it there — the approaches suggested in the SO question I just quoted, for example, seem reasonably lightweight (though I didn’t test them specifically).

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