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Using AspectJ to dependency-inject domain objects with Spring

The following example shows a class that can only be dependency-injected with constructor injection
If you use Spring to dependency-inject a strongly-typed  Collection  into a bean, you can take advantage of Spring’s type-conversion support such that the elements of your strongly-typed  Collection  instances are converted to the appropriate type prior to being added to the  Collection .
You cannot dependency-inject a prototype-scoped bean into your singleton bean, because that injection occurs only once, when the Spring container instantiates the singleton bean and resolves and injects its dependencies.
In this example, when a  UserManager  instance invokes a method on the dependency-injected  UserPreferences  object, it is actually invoking a method on the proxy.