Can I override spring beans instatiated with component scanning?

Good question, I'm not sure. My guess is that whichever one is declared first, wins. So if your context:component-scan comes first, the auto-detected component will get the request.

If your bean comes first, then that wins.

Good question, I'm not sure. My guess is that whichever one is declared first, wins. So if your comes first, the auto-detected component will get the request.

If your comes first, then that wins. If in doubt, test it, it shouldn't be hard to find out. A better solution would be to explicitly exclude the component from the scanner, using the nested filter elements of .

If you're asking Spring for a bean of a given interface and you have two beans of that interface, then you get an exception from the Spring container. An exception from this rule is if your component is marked with @Primary or the XML bean has the primary attribute set to true.

I've done that accidentally before, and it usually results in multiple application contexts. While everything LOOKED like it was working fine, little things like database changes never being committed were usually how I had to track it down.

No, it will not create multiple contexts, it will just create multiple beans. – skaffman May 20 '10 at 14:14.

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