WebFeb 19, 2024 · We use this annotation to mark the main class of a Spring Boot application: @SpringBootApplication encapsulates @Configuration, @EnableAutoConfiguration, and @ComponentScan annotations with their default attributes. 3. @EnableAutoConfiguration. @EnableAutoConfiguration, as its name says, enables auto-configuration. Web这里加了ConditionalOnBean注解，表示只有address这个bean存在才会实例化user. 实现原理如下： 2.2.@ConditionalOnMissingBean @ConditionalOnMissingBean:当给定的在bean不存在时,则实例化当前Bean, 与@ConditionalOnBean相反
面试必问 —— Spring Boot 是如何实现自动配置的？ -文章频道
@Target({TYPE,METHOD}) @Retention @Documented @Conditional(org.springframework.boot.autoconfigure.condition.OnBeanCondition.class) public @interface ConditionalOnBean @Conditional that only matches when beans meeting all the specified requirements are already contained in the BeanFactory . Web8. @Bean. This annotation is used to provide the bean which is going to manage by the spring container its whole life cycle will depend upon the spring container i.e. initialization, creation, destroy, etc. This annotation i.e. @Bean is the alternative of the XML tag. We can apply it to the method level. fanfiction gmod
Spring MVC 如何以正确的方式实现@ConditionalOnBean注解依 …
WebAnnotation Interface ConditionalOnMissingBean. @Conditional that only matches when no beans meeting the specified requirements are already contained in the BeanFactory. … WebApr 10, 2024 · if you want to via MainConfig is null to judge the condition, there is wrong, because the @ConditionalOnBean The condition can only match the bean definitions you can look the comment is this annotation so the @ConditionOnBean(MainConfig.class) in your MyMessageListener always valid, this usage is wrong, if you want to controll the … WebAnnotation Interface ConditionalOnMissingBean. @Conditional that only matches when no beans meeting the specified requirements are already contained in the BeanFactory. None of the requirements must be met for the condition to match and the requirements do not have to be met by the same bean. When placed on a @Bean method, the bean class ... fanfiction glossary