Lazy Beans in Spring

Spring Framework (24 Part Series)

1 Spring Configuration
2 External Properties in Spring
… 20 more parts…
3 Profiles in Spring
4 Spring Expression Language (SpEL)
5 How Spring implements Singleton Beans
6 Converting explicit into implicit configuration in Spring
7 Autowiring in Spring
8 Lazy Beans in Spring
9 @PostConstruct and @PreDestroy in Spring
10 Stereotype and Meta Annotations in Spring
11 Spring’s FactoryBean Interface
12 The Spring Bean Lifecycle
13 Spring AOP
14 Caching in Spring
15 Spring JDBC
16 Spring Transaction Management
17 JPA with Spring
18 JPA with Spring Boot
19 Spring Web MVC
20 Spring Boot for war
21 Spring MVC REST
22 Reactive Spring Applications
23 Spring Security
24 Spring Injection Types

Beans are created on startup when the application context is created (eagerly). But, lazy beans are created the first time they are used. Its use is not recommended.

@Lazy
@Component("jdbcRepository")
public class JdbcRepositoryImpl implements AppRepository {
    ...
}

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When we put the @Lazy annotation over the @Configuration class, all the methods with @Bean annotation should be loaded lazily.

原文链接：Lazy Beans in Spring