Spring MVC @EnableWebMvc Bean配置

Question

我正在嘗試使用@Bean批注配置要在Spring MVC Controller應用程序中使用的Bean。

據我所知，@ Bean注釋等效於XML配置中的標記。 我在做什么如下：

具有配置的類

@Configuration
public class ContextConfig {
    @Bean
    public MyBean myBean() {
        return new MyBean();
    }
}

但是，當嘗試在MVC Controller中自動裝配myBean時，它將失敗。

豆類注射

@Controller
public class HomeController {

    @Autowired
    private MyBean myBean;

    @RequestMapping({"/", "/home"})
    public ModelAndView home (ModelAndView model) {
        model.setViewName("home");
        return model;
    }
}

錯誤是：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'homeController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private javax.validation.ValidatorFactory com.proeza.sgs.controller.HomeController.factory; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [javax.validation.ValidatorFactory] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:292)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:700)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private javax.validation.ValidatorFactory com.proeza.sgs.controller.HomeController.factory; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [javax.validation.ValidatorFactory] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
    ... 22 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [javax.validation.ValidatorFactory] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1100)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:960)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:855)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:480)
    ... 24 more

最后評論

1. 還有其他通過注解（@Bean）配置的Bean，可以毫無問題地注入。
2. MyBean類沒有實現或擴展任何東西。
3. 配置位置在web.xml中聲明

CONF：

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>com.myapp.config</param-value>
</context-param>

ContextConfig類在該程序包中

知道為什么會這樣嗎？

Answer 1

該異常與MyBean類無關。 異常說明：

No qualifying bean of type [javax.validation.ValidatorFactory] found for dependency

Spring無法將javax.validation.ValidatorFactory注入HomeController類。 檢查ValidatorFactory類的配置。

Answer 2

感謝您的回應伊利亞。 您是對的，我粘貼的堆棧不是正確的堆棧。 原因是為了簡化，我使用MyBean給出了示例，但忘記了在堆棧中重命名它。

問題已經解決。 MyBean的真實名稱是MessageResolver，發生的事情是我在ContextConfig類中已經有了另一個稱為messageResolver的方法，該方法用於為Thymeleaf創建bean。 區別在於我的不接收參數，而其他人則接收到MessageSource，但是...閱讀Spring文檔，我發現：

Spring Doc Quote：

2.2.6。 自定義Bean命名

默認情況下，JavaConfig使用@Bean方法的名稱作為結果bean的名稱。 但是，可以使用BeanNamingStrategy擴展點來覆蓋此功能。

Spring @Bean文檔

因此，問題在於未創建該Bean，因為它已被覆蓋其定義。 只是重命名messageResolver方法，錯誤消失了。

再次感謝。 問候！