Response already committed error when sending error responses on a load test

Sun, 14 Oct 2007 06:44:47 -0700 

Hi
When I am doing a load test using Jakarta-HttpComponents-Bench/1.1, I am seeing the following stack trace if the load test returns HTTP 500 responses. This cannot be seen a load test with HTTP 200 responses. Why is a connection closed when using keepalives when responding to an HTTP 500 is this something HTTP forces? 

thanks
asankha

Successful Request and Response
-----------------------------------------------
POST /soap/StockQuoteProxy HTTP/1.1
SOAPAction:  urn:getQuote
Content-Length: 311
Content-Type: text/xml; charset=UTF-8
Host: 127.0.0.1
Connection: Keep-Alive
User-Agent: Jakarta-HttpComponents-Bench/1.1


<soapenv:Envelope 
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/";> 
  <soapenv:Header/> 
  <soapenv:Body>    
     <m0:getQuote xmlns:m0="http://services.samples/xsd";>       
        <m0:request>          
           <m0:symbol>IBM</m0:symbol>       
        </m0:request>    
     </m0:getQuote> 
  </soapenv:Body></soapenv:Envelope>

---------------------------------------------------
HTTP/1.1 200 OK
Content-Type: text/xml; charset=UTF-8
Host: 127.0.0.1
SOAPAction: urn:getQuote
Date: Sun, 14 Oct 2007 13:37:36 GMT
Server: Synapse-HttpComponents-NIO
Transfer-Encoding: chunked
Connection: Keep-Alive

f7
<?xml version='1.0' encoding='UTF-8'?>

  <soapenv:Envelope 
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/";>
     <soapenv:Body>     
        <m:kpTryLater xmlns:m="http://kp.samples/xsd";>

           <m:operation />

        </m:kpTryLater>  
     </soapenv:Body>

  </soapenv:Envelope>
0
-----------------------------------------------

Error Request and Response and Stack trace
-----------------------------------------------
POST /soap/StockQuoteProxy HTTP/1.1
SOAPAction:  urn:getQuote
Content-Length: 311
Content-Type: text/xml; charset=UTF-8
Host: 127.0.0.1
Connection: Keep-Alive
User-Agent: Jakarta-HttpComponents-Bench/1.1


<soapenv:Envelope 
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/";> 
  <soapenv:Header/> 
  <soapenv:Body>    
     <m0:getQuote xmlns:m0="http://services.samples/xsd";>       
        <m0:request>          
           <m0:symbol>IBM</m0:symbol>       
        </m0:request>    
     </m0:getQuote> 
  </soapenv:Body></soapenv:Envelope>

-----------------------------------------------
HTTP/1.1 500 Internal Server Error
Content-Type: text/xml; charset=UTF-8
Host: 127.0.0.1
SOAPAction: urn:getQuote
Date: Sun, 14 Oct 2007 13:41:36 GMT
Server: Synapse-HttpComponents-NIO
Transfer-Encoding: chunked
Connection: Close

166
<?xml version='1.0' encoding='UTF-8'?>

  <soapenv:Envelope 
xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/";>

     <soapenv:Body>
        <soapenv:Fault>

           <faultcode 
xmlns:tns="http://www.w3.org/2003/05/soap-envelope";>tns:Receiver</faultcode>
           <faultstring>**Request Denied - Backend service 
busy**</faultstring>

           <detail />
        </soapenv:Fault>
     </soapenv:Body>
  </soapenv:Envelope>
0
-----------------------------------------------

2007-10-14 19:42:16,834 [127.0.1.1-asankha] [HttpServerWorker-2] ERROR 
ServerHandler Unexpected HTTP protocol error : Response already submitted

org.apache.http.HttpException: Response already submitted

       at 
org.apache.http.impl.nio.DefaultNHttpServerConnection.submitResponse(DefaultNHttpServerConnection.java:201)
       at 
org.apache.synapse.transport.nhttp.LoggingNHttpServerConnection.submitResponse(LoggingNHttpServerConnection.java:54)
       at 
org.apache.synapse.transport.nhttp.ServerHandler.commitResponse(ServerHandler.java:221)
       at 
org.apache.synapse.transport.nhttp.HttpCoreNIOSender.sendAsyncResponse(HttpCoreNIOSender.java:350)
       at 
org.apache.synapse.transport.nhttp.HttpCoreNIOSender.invoke(HttpCoreNIOSender.java:215)

       at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:396)

       at 
org.apache.synapse.core.axis2.Axis2Sender.sendBack(Axis2Sender.java:104)
       at 
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:170)
       at 
org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:97)
       at 
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:60)
       at 
org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:121)
       at 
org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:140)

       at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:145)

       at 
org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:275)
       at 
org.apache.synapse.transport.nhttp.ServerWorker.processPost(ServerWorker.java:211)
       at 
org.apache.synapse.transport.nhttp.ServerWorker.run(ServerWorker.java:175)
       at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
       at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)

       at java.lang.Thread.run(Thread.java:595)


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