Lazy Initialize Spring Beans

Spring provides an attribute called lazy-init to inform the Spring IOC container for not creating that bean at the start up. lazy-init will be set as true to indicate the container. The beans will be created only when requested.




    id="..." class="..."
     
 

 
    id="..." class="..." lazy-init="true"
     
 

 
    id="..." class="..." init-method="..."
     
 

 
    id="..." class="..." destroy-method="..."

The init-method attribute specifies a method that is to be called on the bean immediately upon instantiation. Similarly, destroy-method specifies a method that is called just before a bean is removed from the container.


@Configuration
// @Lazy - For all Beans to load lazily
public class AppConf {

    @Bean
    @Lazy
    public Demo demo() {
        return new Demo();
    }
}

@Component
@Lazy
public class Demo {
    ....
    ....
}

@Component
public class B {

    @Autowired
    @Lazy // If this is not here, Demo will still get eagerly instantiated to satisfy this request.
    private Demo demo;

    .......
 }