org.springframework.context.annotation

Annotation Type Lazy

@Target(value={TYPE,METHOD,CONSTRUCTOR,PARAMETER,FIELD})
 @Retention(value=RUNTIME)
 @Documented
public @interface Lazy

Indicates whether a bean is to be lazily initialized.

May be used on any class directly or indirectly annotated with @Component or on methods annotated with @Bean.

If this annotation is not present on a @Component or @Bean definition, eager initialization will occur. If present and set to true, the @Bean or @Component will not be initialized until referenced by another bean or explicitly retrieved from the enclosing BeanFactory. If present and set to false, the bean will be instantiated on startup by bean factories that perform eager initialization of singletons.

If Lazy is present on a @Configuration class, this indicates that all @Bean methods within that @Configuration should be lazily initialized. If @Lazy is present and false on a @Bean method within a @Lazy-annotated @Configuration class, this indicates overriding the 'default lazy' behavior and that the bean should be eagerly initialized.

In addition to its role for component initialization, this annotation may also be placed on injection points marked with Autowired or Inject: In that context, it leads to the creation of a lazy-resolution proxy for all affected dependencies, as an alternative to using ObjectFactory or Provider. Please note that such a lazy-resolution proxy will always be injected; if the target dependency does not exist, you will only be able to find out through an exception on invocation. As a consequence, such an injection point results in unintuitive behavior for optional dependencies. For a programmatic equivalent, allowing for lazy references with more sophistication, consider ObjectProvider.

Since:

3.0

Author:

Chris Beams, Juergen Hoeller

See Also:

Primary, Bean, Configuration, Component

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
boolean	value Whether lazy initialization should occur.

Element Detail

value

public abstract boolean value

Whether lazy initialization should occur.

Default:

true