The default behaviour is false:
By default, ApplicationContext implementations eagerly create and
configure all singleton beans as part of the initialization process.
Generally, this pre-instantiation is desirable, because errors in the
configuration or surrounding environment are discovered immediately,
as opposed to hours or even days later. When this behavior is not
desirable, you can prevent pre-instantiation of a singleton bean by
marking the bean definition as lazy-initialized. A lazy-initialized
bean tells the IoC container to create a bean instance when it is
first requested, rather than at startup.