Spring MVC @EnableWebMvc Bean配置

Question

我正在尝试使用@Bean批注配置要在Spring MVC Controller应用程序中使用的Bean。

据我所知，@ Bean注释等效于XML配置中的标记。 我在做什么如下：

具有配置的类

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

但是，当尝试在MVC Controller中自动装配myBean时，它将失败。

豆类注射

@Controller
public class HomeController {

    @Autowired
    private MyBean myBean;

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

错误是：

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

最后评论

1. 还有其他通过注解（@Bean）配置的Bean，可以毫无问题地注入。
2. MyBean类没有实现或扩展任何东西。
3. 配置位置在web.xml中声明

CONF：

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

ContextConfig类在该程序包中

知道为什么会这样吗？

Answer 1

该异常与MyBean类无关。 异常说明：

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

Spring无法将javax.validation.ValidatorFactory注入HomeController类。 检查ValidatorFactory类的配置。

Answer 2

感谢您的回应伊利亚。 您是对的，我粘贴的堆栈不是正确的堆栈。 原因是为了简化，我使用MyBean给出了示例，但忘记了在堆栈中重命名它。

问题已经解决。 MyBean的真实名称是MessageResolver，发生的事情是我在ContextConfig类中已经有了另一个称为messageResolver的方法，该方法用于为Thymeleaf创建bean。 区别在于我的不接收参数，而其他人则接收到MessageSource，但是...阅读Spring文档，我发现：

Spring Doc Quote：

2.2.6。 自定义Bean命名

默认情况下，JavaConfig使用@Bean方法的名称作为结果bean的名称。 但是，可以使用BeanNamingStrategy扩展点来覆盖此功能。

Spring @Bean文档

因此，问题在于未创建该Bean，因为它已被覆盖其定义。 只是重命名messageResolver方法，错误消失了。

再次感谢。 问候！