使用作用域代理 bean 时春季出错

Question

我在 spring 中尝试使用会话范围 bean 时遇到错误，错误是：

HTTP Status 500 - Error creating bean with name 'scopedTarget.usuarioAutenticado': Scope 'session' is not active for the current thread; consider defining a scoped proxy for this bean if you intend to refer to it from a singleton; nested exception is java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.

我的配置是： web.xml：

<servlet>
    <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            WEB-INF/applicationContext*.xml
        </param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
    <url-pattern>/sys/*</url-pattern>
</servlet-mapping>
<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>

还有豆子：

<bean id="usuarioAutenticado" class="com.wi.security.UsuarioAutenticado" scope="session">
    <aop:scoped-proxy/>
</bean>

我一直在搜索这个问题，我发现的只是将以下行添加到 web.xml：

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

这解决了问题，但副作用是我所有的@Scheduled 注解的方法都运行了两次，我认为这是因为 spring 正在创建两个上下文。

阅读 Spring 文档说：

DispatcherServlet、RequestContextListener 和 RequestContextFilter 都做到了 同样的事情，即将 HTTP 请求对象绑定到为该请求提供服务的线程。这 使请求和会话范围的 bean 在调用链的下游可用。

所以，我不明白为什么不只使用 DispatcherServlet 配置。 希望有人可以帮助我找到解决方案，我是春天的新手。 提前致谢。

Answer 1

知道了！

我在 web.xml 中设置了 contextConfigLocation：

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>WEB-INF/applicationContext*.xml</param-value>
</context-param>

然后在 servlet 配置中再次设置：

<servlet>
    <servlet-name>spring</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>WEB-INF/applicationContext*.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

解决方案是删除 servlet 参数值：

<servlet>
    <servlet-name>spring</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value/>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>