springMVC项目异步处理请求的错误Async support must be enabled on a servlet and for all filters involved in async



从github上down下来一个项目，springMVC-chat。作者全是用的注解，也就是零配置。


这可苦了我，经过千辛万苦，最终集成到现在的项目中有一点样子了，结果报出来下面的错误。红色部分。解决方法为，在web.xml中也就是springMVC的总配置文件中加上一句话：


<async-supported>true</async-supported>


这句话的位置一定要放正确，否则，一切都是徒劳。至于配置spring异步支持（其实是配置servlet异步支持）的放置位置见下图。




在


五月 16, 2014 4:30:59 下午 org.apache.catalina.core.StandardWrapperValve invoke


严重: Servlet.service() for servlet [SpringMVC] in context with path [/ZHDM] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: Async support must be enabled on a servlet and for

 all filters involved in async request processing. This is done in Java code using the Servlet API or by adding "<async-supported>true</async-supported>" to servlet and filter declarations in web.xml.] with root cause


java.lang.IllegalStateException: Async support must be enabled on a servlet and for all filters involved in async request processing. This is done in Java code using the Servlet API or by adding "<async-supported>true</async-supported>" to servlet and filter

 declarations in web.xml.


at org.springframework.util.Assert.state(Assert.java:385)


at org.springframework.web.context.request.async.StandardServletAsyncWebRequest.startAsync(StandardServletAsyncWebRequest.java:104)


at org.springframework.web.context.request.async.WebAsyncManager.startAsyncProcessing(WebAsyncManager.java:431)


at org.springframework.web.context.request.async.WebAsyncManager.startDeferredResultProcessing(WebAsyncManager.java:409)


at org.springframework.web.servlet.mvc.method.annotation.DeferredResultMethodReturnValueHandler.handleReturnValue(DeferredResultMethodReturnValueHandler.java:51)


at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:71)


at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122)


at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)


at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:690)


at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)


at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)


at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)


at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)


at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)


at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)


at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)


at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)


at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:301)


at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)


at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)


at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)


at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)


at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)


at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)


at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)


at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)


at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)


at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)


at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)


at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136)


at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:74)


at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)


at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)


at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516)


at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1015)


at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:652)


at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277)


at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2451)


at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2440)


at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)


at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)


at java.lang.Thread.run(Thread.java:744)
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