Spring Boot @PostConstructlast modified July 20, 2023 Spring Boot @PostConstruct tutorial shows how to use the @PostConstruct annotation in a Spring application. Spring is a popular Java application framework and Spring Boot is an evolution of Spring that helps create stand-alone, production-grade ...
这可能导致返回null或者抛出异常(如NoSuchBeanDefinitionException)。 因此,不能保证在@PostConstruct中调用getBeanByAnnotation一定能获得完全准确的结果,特别是当涉及到初始化顺序较晚的Bean时。如果需要确保所有Bean都已初始化并可以被查找,考虑使用Spring的ApplicationListener接口监听ContextRefreshedEvent事件,或者将Bean查找逻辑...
@postContruct全限定类名是javax.annotation.PostConstruct,可以看出来其本身不是Spring定义的注解,但是Spring提供了具体的实现,所以这篇文章主要分析的是@PostConstruct在Spring项目开发中的功能特性、实现方式和基本工作原理。 功能特性 从@PostConstruct注解的注释上看,可以了解到以下内容: 1、要在依赖加载后,对象佤用前执...
从Java EE5规范开始,Servlet增加了两个影响Servlet生命周期的注解(Annotation):@PostConstruct和@PreConstruct。这两个注解被用来修饰一个非静态的void()方法.而且这个方法不能有抛出异常声明。 使用方式,例如: 1.@PostConstruct说明 &nbs...源码深入解析spring 的初始化方法 initMethod (标有注解的@postConstruct的方法...
import org.springframework.beans.factory.annotation.Autowired; import zd.dms.dao.ebuy.GroupDao; public class Person implements InitializingBean,DisposableBean{ private String name; @Autowired private GroupDao groupDao; public Person() { System.out.println("---实例化一个Person对象---"); System.out....
从之前文章@Autowired注解原理分析和Spring bean生命周期管理两篇文章可以知道,@Autowired和@PostConstruct逻辑分别由AutowiredAnnotationBeanPostProcessor和CommonAnnotationBeanPostProcessor实现,执行顺序AutowiredAnnotationBeanPostProcessor在前,CommonAnnotationBeanPostProcessor在后。
@PostConstruct,@PreDestroy是Java规范JSR-250引入的注解,定义了对象的创建和销毁工作,同一期规范中还有注解@Resource,Spring也支持了这些注解。 在Spring中,@PostConstruct,@PreDestroy注解的解析是通过BeanPostProcessor实现的,具体的解析类是org.springframework.context.annotation.CommonAnnotationBeanPostProcessor,其父类...
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous...
1packagecom.wbf.bean;23importjavax.annotation.PostConstruct;45importorg.apache.log4j.Logger;6importorg.springframework.stereotype.Service;78@Service("bean1")9publicclassBean1 {1011privatestaticfinalLogger log = Logger.getLogger(Bean1.class);1213publicBean1() {14log.info(System.currentTimeMillis() +...
* PostConstruct annotation is applied MUST fulfill all of the following * criteria: * * * The method MUST NOT have any parameters except in the case of * interceptors in which case it takes an InvocationContext object as * defined by the...