Beans on which the current bean depends. Any beans specified are guaranteed to be
created by the container before this bean. Used infrequently in cases where a bean
does not explicitly depend on another through properties or constructor arguments,
but rather depends on the side effects of another bean's initialization.
May be used on any class directly or indirectly annotated with
Component or on methods annotated
DependsOn at the class level has no effect unless component-scanning
is being used. If a
DependsOn-annotated class is declared via XML,
DependsOn annotation metadata is ignored, and
<bean depends-on="..."/> is respected instead.