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I am working on a Spring 3.1 MVC application and for one of my scenarios, I had to write two implementations of a DAO. I would like to know how to autowire this in a service layer based on another object's attribute. For example, class Vehicle { private name; private type; .. .. .. } @Service class VehicleServiceImpl implements VehicleService { // There are two implementations to this DAO // if Vehicle.type == "CAR", inject CarDAO // if Vehicle.type == "TRAIN", inject TrainDAO @Autowired private VehicleDAO vehicleDAO ; } @Repository class CarDAO implements VehicleDAO { } @Repository class TrainDAO implements VehicleDAO { } If my Vehicle is a Car, I need to autowire CarDAO and if it's a train, I need to autowire TrainDAO What is the best way to implement this in spring 3.1. I was hoping to use either context property place holders or @Qualifier annotation but both these are kind of restricted to lookup based on some property. I am not sure how to do this at runtime based on the property of another object.

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