> I have an aversion to setter/field based injection because it allows you to instantiate an object in an incorrect state.

Oh yes. I recognise that JavaBeans had its reasons for being, but then you get to JPA and it's time for all the boggling.

My personal pet peeve is bean validation. The goals of the API are laudable, but the fact that the implementation is annotation-driven drives me nuts.

Annotations are fine for intra-project code contracts, but using them for external validation means that if you, say, deploy on a application server with an older version of Jersey, you're suddenly SOL when none of your validation logic is executed.