Where does James Joyce use stream of consciousness in the "Dubliners" stories?

Actually, I think, there is no manifestation of the complete technique in Dubliners but we can have a preview of his later novels.

So, in Araby, we see the world from the point of view (or within the mind) of the boy. Instead of looking at the story from a camera above, we see the world from the boy's eyes. And, also, we have to guess what's left out of the narration; we don't have the full picture but parts of it, as long as, that is, they are perceived by the boy himself.