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POAkka Futures + Spring MVC deferred results + tomcat 7.+
 

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    <p>Spring-api 3.+ onwards introduces support aync request processing, So I thought of putting it to sample webapplication with my favourite concurrency model provided by Akka</p> <p>my code looks something like this </p> <pre><code> @RequestMapping(value = Array("/"), method = Array(RequestMethod.GET)) @ResponseBody def adminHome(request: HttpServletRequest) : DeferredResult[ModelAndView] = { import ExecutionContext.Implicits.global val result = new DeferredResult[ModelAndView] ........ code for some future ......... // creating model map future from some future val modelMapFuture: Future[Map[String, Any]] = someFuture.flatMap(urlObjects =&gt; Future( Map("urlList" -&gt; urlObjects.asJava) )) // setting the deferred result value upon completion of future modelMapFuture.onComplete { case Success(modelMap) =&gt; result.setResult(new ModelAndView("index", modelMap.asJava)) case Failure(e) =&gt; result.setResult(new ModelAndView("index")) } result } </code></pre> <p>I have enable the aync support for Spring mvc DispatcherServelet and all the Filters attached to the url mapping of particular servelet.</p> <p>But all the time I'm getting an empty page as the result. </p> <p>I can help you to narrow down the problem by saying - </p> <p>a. No exception in model/view</p> <p>If I set view as a simple JSP with hello world, its also not loading. </p> <p>b. Request mapping is working perfectly</p> <p>c. Future gets completed without errors </p> <p>d. Deffered result is set properly </p> <p>I have bind a DeferredResultProcessingInterceptorAdapter implementation to the mvc:deferred-result-interceptors and put logs for beforeConcurrentHandling, preProcess, postProcess and afterCompletion I'm getting following logs from the interceptor</p> <blockquote> <p>Before concurrent handling request : deffered result expired or set is : false </p> <p>pre process : deffered result expired or set is : false</p> <p>post process : deffered result expired or set is : true </p> <p>after completion : deffered result expired or set is : true</p> </blockquote> <p>Any help will be highly appriciated as I was strugging with this for entire two days. </p> <p>More details </p> <p>Spring version 3.2.3-RELEASE Tomcat version 7.0.42</p>
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