在实际web请求之外使用请求范围的bean

Question

我有一个web应用程序，它有一个Spring集成逻辑，在一个单独的线程中运行。问题是，在某个时候，我的Spring集成逻辑尝试使用请求范围的bean，然后我得到以下错误：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.tenantContext': Scope 'request' 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.


Caused by: 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.

我有ContextLoaderListener设置：

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

我的作用域Bean是这样注释的（因为我听说代理我的Bean会有帮助）：

@Component
@Scope(value = "request", proxyMode = ScopedProxyMode.TARGET_CLASS)  
public class TenantContext  implements Serializable {

我所做的可能吗？如果是，我在这里遗漏了什么？如果没有，关于我如何实现这一目标，还有其他建议吗？

Answer 1

使用属性threadContextInheritable设置为true的RequestContextFilter。这使得子线程继承父线程的上下文，该上下文包含请求对象本身。还要确保执行器不会重用池中的线程，因为请求对象非常特定于该请求，并且不能在各种请求之间共享。SimpleAsyncTaskExecutor就是这样一个执行者。

有关更多信息，请参阅当前线程的作用域“会话”未处于活动状态；IllegalStateException:未找到线程绑定请求。

Answer 2

您只能在运行请求的web容器线程上使用请求（和会话）范围的bean。

我假设线程正在等待来自SI流的异步回复？

如果是这样，您可以将请求范围的bean绑定到消息，可能是在头中，或者在负载的某个地方。

Answer 3

public class WebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[] { RootConfiguration.class };
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[] { WebMvcConfiguration.class };
    }

    @Override
    protected String[] getServletMappings() {
        return new String[] { "/" };
    }

    @Override
    protected Filter[] getServletFilters() {
        return new Filter[] { new HiddenHttpMethodFilter() };
    }

    **@Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        super.onStartup(servletContext);
        servletContext.addListener(new RequestContextListener());
    }**
}