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spring - Spring WebMvcConfigurer 运行两次

问题描述

我注意到我的 Spring Web 应用程序中有一个奇怪的行为：

我的WebMvcConfigurer实现运行了两次，我不知道为什么。我是使用 Spring 的新手。

这是我认为是问题的一部分的所有课程。它们都在同一个包中br.com.cmabreu.config（询问您是否需要更多信息）。我正在使用5.0.4.RELEASE：

@EnableWebMvc
@Configuration
public class WebConfig implements WebMvcConfigurer {

}


public class SecurityWebApplicationInitializer 
    extends AbstractSecurityWebApplicationInitializer {

    public SecurityWebApplicationInitializer() {
        super( LoginSecurityConfig.class );
    }

}


@Configuration
@EnableWebSecurity
@ComponentScan(basePackages = "br.com.cmabreu.*")
public class LoginSecurityConfig extends WebSecurityConfigurerAdapter {


    @Autowired
    private ComboPooledDataSource dataSource;   

    public void setDataSource(ComboPooledDataSource dataSource) {
        this.dataSource = dataSource;
    }


}

public class AppInitializer 
    extends AbstractAnnotationConfigDispatcherServletInitializer {

}

@Configuration
@EnableTransactionManagement
public class HibernateConfig {

    @Bean(name="dataSource")
    public ComboPooledDataSource getDataSource() {
        ComboPooledDataSource driverManagerDataSource = new ComboPooledDataSource();
        ...
    }

}

执行顺序为：

1) SecurityWebApplicationInitializer
2) AppInitializer
3) HibernateConfig
4) WebConfig
5) LoginSecurityConfig
6) WebConfig ( AGAIN )

如果我从中删除@ComponentScan，LoginSecurityConfig则初始化序列会在之后引发错误，AppInitializer因为它找不到HibernateConfig：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'loginSecurityConfig': Unsatisfied dependency expressed through field 'dataSource'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.mchange.v2.c3p0.ComboPooledDataSource' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:587)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:373)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1344)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:409)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:291)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4641)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5105)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1425)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1415)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:941)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:839)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1425)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1415)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:941)
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:258)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:770)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:671)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:353)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:493)
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.mchange.v2.c3p0.ComboPooledDataSource' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1509)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1104)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1065)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:584)
    ... 45 more

标签： spring

解决方案

@EnableWebMvc注解本身从 WebMvcConfigurationSupport 导入 Spring MVC 配置（使用默认方法）。

您不需要将其应用于实现 WebMvcConfigurer 的类（使用默认方法）。

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