Created attachment 31200 [details]
Servlet with Async processing and Java Based client

I created a ProblemServlet which receives request via a Java based client. The Servlet starts an Async processing for each request.
Within the Async processing run() method there is a while loop which cyclically sends String messages to the client. The implementation of run method is shown.

public void run()
        {
            try
            {
                String msg = "";
                ServletOutputStream outputStream = publisherAsyncCtx.getResponse().getOutputStream();
                boolean continu = true;
                
                while (continu)
                {
                    msg = "";

                    msg = "|" + " " + new Date();
                    System.out.println("publishing message... " + msg);
                    
                    outputStream.println(msg);
                    publisherAsyncCtx.getResponse().flushBuffer();
                    
                    try
                    {
                        Thread.sleep(1000);
                    }
                    catch (InterruptedException e)
                    {
                        System.out.println("sleep InterruptedException: " + e.getMessage());
                        e.printStackTrace();
                    }
                }
            }

When a Java based console application client hits this servlet and reads its output stream, for around 10 sec the messages arrive. But after 10 seconds the connection is closed by the server.

Logs on the Server side:
Starting the Async Context.
publishing message... | Mon Jan 13 11:28:30 IST 2014
publishing message... | Mon Jan 13 11:28:31 IST 2014
publishing message... | Mon Jan 13 11:28:32 IST 2014
publishing message... | Mon Jan 13 11:28:33 IST 2014
publishing message... | Mon Jan 13 11:28:34 IST 2014
publishing message... | Mon Jan 13 11:28:35 IST 2014
publishing message... | Mon Jan 13 11:28:36 IST 2014
publishing message... | Mon Jan 13 11:28:37 IST 2014
publishing message... | Mon Jan 13 11:28:38 IST 2014
publishing message... | Mon Jan 13 11:28:39 IST 2014
publishing message... | Mon Jan 13 11:28:40 IST 2014
publishing message... | Mon Jan 13 11:28:41 IST 2014
Exception in thread "http-bio-8080-exec-6" java.lang.IllegalStateException: The request associated with the AsyncContext has already completed processing.
	at org.apache.catalina.core.AsyncContextImpl.check(AsyncContextImpl.java:521)
	at org.apache.catalina.core.AsyncContextImpl.getResponse(AsyncContextImpl.java:245)
	at com.pg.orion.artcloopcheck.ProblemServlet$AsynRunnable.run(ProblemServlet.java:67)
	at org.apache.catalina.core.AsyncContextImpl$RunnableWrapper.run(AsyncContextImpl.java:557)
	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:722)


Issue is seen with "apache-tomcat-7.0.50", "apache-tomcat-7.0.47". Not tested with other release 7 variants.
The same codebase when run on "apache-tomcat-8.0.0-RC10" there are no issues.