Spring ApplicationContext运行两次

Question

我想通过Spring安全性迁移Spring WebMvcConfigurerAdapter Configuration。 现在我遇到的问题是我得到了2个ApplicationContextes，并且我的Singelten类是Statefull的。 这是我的web.xml和FrontendConfig。

请放纵我。 我是新手:)

    <?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;
    }
}

谢谢

Answer 1

您已经声明了相同的@Configuration类

 de.wiegand.mytransport.frontend.config.FrontendConfig

在ContextLoaderListener和DispatcherServlet 。

这两个都创建一个ApplicationContext 。 由于DispatcherServlet上下文（子级）可以访问ContextLoaderListener上下文（父级）中的bean，因此最终将出现重复的bean甚至初始化错误（取决于配置）。

您的FrontendConfig是一个WebMvcConfigurerAdapter ，因此应该是DisaptcherServlet加载的上下文。

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