lazy-initialization: true #默认false 关闭 开启了全局懒加载,想要过滤某个 bean,可以通过设置 @Lazy(false) 排除。 @Component @Lazy(false) public class MyBean { public MyBean() { System.out.println("My bean init success."); } } 还有一种是
1. 第20行则是跟本次主题有关的,就是说在容器启动的时候只处理non-lazy-init bean,懒加载的bean在Spring启动阶段根本不做任何处理下面看下源码就明白了 点进去第20行的finishBeanFactoryInitialization(beanFactory)里头有个初始化non-lazy-init bean的函数 preInstantiateSingletons() 具体逻辑如下 1.对beanNames 集...
public void setup() { sessionFactory = new Configuration().configure().buildSessionFactory(); } public void exit() { sessionFactory.close(); } public void create(Object obj) { Session session = sessionFactory.openSession(); session.beginTransaction(); session.save(obj); session.getTransaction...
我(寻自己)以前碰到 延迟初始化 (Lazy Initialization) 的时候,一直都是理解的不是太透彻,今天决定彻底的认识下 延迟初始化 (Lazy Initialization)。 1.定义 一个对象的延迟初始化 (Lazy Initialization)意味着该对象的创建将会延迟至第一次使用该对象时。延迟初始化 (Lazy Initialization)主要用于提高性能,避免浪费...
org.hibernate.LazyInitializationException: could not initialize proxy - no Session at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:155) at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:268) ...
You should initialize most fields normally, not lazily. If you must initialize a field lazily in order to achieve your performance goals, or to break a harmful initialization circularity, then use the appropriate lazy initialization technique. For instance fields, it is the double-check idiom; for...
lazy-initialization: true Or, if it’s the case, in ourapplication.propertiesfile: spring.main.lazy-initialization=true This configuration affects all the beans in the context. So, if we want to configure lazy initialization for a specific bean, we can do it through the@Lazyapproach. ...
Bottom Line:Implementing lazy initialization recently became much easier in Java (as did many other things) when lambda expressions were introduced in Java 8. Still, in C# we can use the Lazy<T> wrapper class which provides the semantics of lazy initialization for any class library or user-spe...
2.2 Java 2.3 JavaScript 2.4 C++ 2.5 Smalltalk 2.6 Ruby 2.7 Python 2.8 PHP 3 See also 4 External links [edit]The "lazy factory" In a software design pattern view, lazy initialization is often used together with a factory method pattern. This combines three ideas: using a factory method to ...
在Hibernate中,集合類的映射可以延遲初始(Lazy Initialization),也就是在真正索取該物件的資料時,才向資料庫查詢,就這個例子來說,就是我們在讀取User時,先不取得其中的 addrs屬性中之物件資料,由於只需要讀取User的name屬性,此時我們只要執行一次select即可,真正需要addrs的資料時,才向資料庫要求。