Lazy Initialized Beans

Lazy Initialized Beans

By default, the container creates and configures all singleton beans during initialization. To avoid this, we can use the lazy-init attribute with value true on the bean configuration:

<bean id="item1" class="org.baeldung.store.ItemImpl1" lazy-init="true" />

Consequently, the item1 bean will only be initialized when it's first requested, and not at startup. The advantage of this is faster initialization time, but the trade-off is that we won't discover any configuration errors until after the bean is requested, which could be several hours or even days after the application has already been running.

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参考：
Intro to Inversion of Control and Dependency Injection with Spring