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I am using Spring's @Component annotation to configure many of the beans in my Spring 3.0 application. I would like to know if it's possible to construct some of these beans lazily - especially the prototype beans?
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@Lazy annotation indicates whether a bean is to be lazily initialized. It can be used on @Component and @Bean definitions. A @Lazy bean is not initialized until referenced by another bean or explicitly retrieved from BeanFactory . Beans that are not annotated with @Lazy are initialized eagerly.
Spring @Bean Annotation is applied on a method to specify that it returns a bean to be managed by Spring context. Spring Bean annotation is usually declared in Configuration classes methods. In this case, bean methods may reference other @Bean methods in the same class by calling them directly.
The reason behind this is simple: to avoid and detect all possible errors immediately rather than at runtime. However, there're cases when we need to create a bean, not at the application context startup, but when we request it. In this quick tutorial, we're going to discuss Spring's @Lazy annotation.
To declare lazy-initialized bean you can use @Lazy annotation.
Note, however, that it doesn't make sense for prototype beans - they can't be eagerly initialized, so there is no need to mark them lazy.
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Lazy initialization isn't an option in the context of prototype-scoped beans. Those beans are instantiated and initialized on demand every time something asks for them, so they are, by nature, lazily initialized.
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