Spring ApplicationContext运行两次

Question

我想用Spring安全性迁移Spring WebMvcConfigurerAdapter配置。 现在我遇到了问题，我得到了2个ApplicationContextes，并且我的Singelten类是有状态的。 在这里我的web.xml和我的FrontendConfig。

请放纵我。我是一个新手:)

<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 
    version="3.0"> 


    <context-param> 
    <param-name>contextClass</param-name> 
    <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value> 
    </context-param> 

    <context-param> 
    <param-name>contextConfigLocation</param-name> 
    <param-value> 
     de.wiegand.mytransport.frontend.config.FrontendConfig 
    </param-value> 
    </context-param> 

    <filter> 
    <filter-name>springSecurityFilterChain</filter-name> 
    <filter-class> 
     org.springframework.web.filter.DelegatingFilterProxy 
    </filter-class> 
    </filter> 

    <filter-mapping> 
    <filter-name>springSecurityFilterChain</filter-name> 
    <url-pattern>/*</url-pattern> 
    </filter-mapping> 

    <listener> 
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 
    </listener> 

    <servlet> 
     <servlet-name>dispatcher</servlet-name> 
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
     <init-param> 
      <param-name>contextClass</param-name> 
      <param-value> 
       org.springframework.web.context.support.AnnotationConfigWebApplicationContext 
      </param-value> 
     </init-param> 
     <init-param> 
      <param-name>contextConfigLocation</param-name> 
      <param-value> 
       de.wiegand.mytransport.frontend.config.FrontendConfig 
      </param-value> 
     </init-param> 
     <load-on-startup>2</load-on-startup> 
    </servlet> 

    <servlet-mapping> 
     <servlet-name>dispatcher</servlet-name> 
     <url-pattern>/</url-pattern> 
    </servlet-mapping> 

    <servlet> 
     <servlet-name>Faces Servlet</servlet-name> 
     <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> 
     <load-on-startup>1</load-on-startup> 
    </servlet> 


    <servlet-mapping> 
     <servlet-name>Faces Servlet</servlet-name> 
     <url-pattern>*.xhtml</url-pattern> 
    </servlet-mapping> 

    <listener> 
     <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class> 
    </listener> 


    <welcome-file-list> 
     <welcome-file>index.xhtml</welcome-file> 
    </welcome-file-list> 

</web-app> 

配置类

@Import({ StackEnvironment.class }) 
@EnableWebMvc 
@ComponentScan({ "de.wiegand" }) 
@EnableTransactionManagement 
@EnableAspectJAutoProxy 
@Configuration 
@ImportResource({ "/WEB-INF/spring-security.xml", "/WEB-INF/springsecurity.taglib.xml" }) 
public class FrontendConfig extends WebMvcConfigurerAdapter { 
    @Override 
    public void addResourceHandlers(ResourceHandlerRegistry registry) { 

     // 2DO: Wrong ?????? 
     registry.addResourceHandler("/assets/**") 
       .addResourceLocations("classpath:/META-INF/resources/webjars/") 
       .setCachePeriod(31556926); 
     registry.addResourceHandler("/css/**").addResourceLocations("/css/") 
       .setCachePeriod(31556926); 
     registry.addResourceHandler("/img/**").addResourceLocations("/img/") 
       .setCachePeriod(31556926); 
     registry.addResourceHandler("/js/**").addResourceLocations("/js/") 
       .setCachePeriod(31556926); 
    } 

    @Override 
    public void configureDefaultServletHandling(
      DefaultServletHandlerConfigurer configurer) { 
     configurer.enable(); 
    } 

    @Bean 
    public InternalResourceViewResolver getInternalResourceViewResolver() { 
     InternalResourceViewResolver resolver = new InternalResourceViewResolver(); 
     resolver.setPrefix("/pages/"); // 
     resolver.setSuffix(".xhtml"); 

     return resolver; 
    } 
} 

THX

Answer 1

声明了相同@Configuration类

de.wiegand.mytransport.frontend.config.FrontendConfig 

在ContextLoaderListener和DispatcherServlet两者。

这两个都创建了ApplicationContext。由于DispatcherServlet上下文（子级）可以访问ContextLoaderListener上下文（父级）中的bean，所以最终会出现重复的bean甚至初始化错误（取决于配置）。

您的FrontendConfig是WebMvcConfigurerAdapter，因此应该是DisaptcherServlet加载的上下文。

如果您没有其他上下文（应用程序范围的contxt），请在web.xml中删除ContextLoaderListener声明。