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[jetty-users] handling the same request multiple times?

When I put my Jetty server under high load, I sometimes get IllegalStateException being thrown mentioning “ReadListener already set”. These exceptions are thrown when a ReadListener is set more than once to the inputstream of an incoming request. However, I never do that. I can only explain this if the same request is sent to my handler multiple times, which I don’t really understand. Can somebody explain how this can happen so that I can avoid these exceptions? Note that I don’t get these exception under light load.

 

Here’s some more background:

 

(1)          I’m using jetty 9.3.6.v20151106

(2)          I’m running an embedded Jetty

(3)          I only have a single request handler. It extends AbstractHandler and does the following:

 

       public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {

             String id = request.getRequestURI().substring(1);

             baseRequest.setHandled(true);

             long count = requests.decrementAndGet();

             if (count < 0) {

                    requests.incrementAndGet();

                    response.setStatus(HttpStatus.SERVICE_UNAVAILABLE_503);

                    return;

             }

             AsyncContext context = request.startAsync();

            ServletInputStream inputStream = request.getInputStream();

             inputStream.setReadListener(new ReadListener() { ... });

}

 

 

So as you can see, all requests are handled asynchronously unless my server is overloaded (which is not the case when the exceptions occur).

 

 

Thanks,

 

Bert

 

PS: Here’s the complete stacktrace

 

java.lang.IllegalStateException: ReadListener already set

        at org.eclipse.jetty.server.HttpInput.setReadListener(HttpInput.java:528) ~[opf-0.0.1-SNAPSHOT-allinone.jar:na]

        at com.clear2pay.opf.realtime.rest.HttpRequestHandler.handle(HttpRequestHandler.java:56) ~[opf-0.0.1-SNAPSHOT-allinone.jar:na]

        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:119) ~[opf-0.0.1-SNAPSHOT-allinone.jar:na]

        at org.eclipse.jetty.server.Server.handleAsync(Server.java:567) ~[opf-0.0.1-SNAPSHOT-allinone.jar:na]

        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:393) [opf-0.0.1-SNAPSHOT-allinone.jar:na]

        at org.eclipse.jetty.server.HttpChannel.run(HttpChannel.java:262) [opf-0.0.1-SNAPSHOT-allinone.jar:na]

        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654) [opf-0.0.1-SNAPSHOT-allinone.jar:na]

        at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572) [opf-0.0.1-SNAPSHOT-allinone.jar:na]

        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_66]

12:27:09.743 [qtp2027944996-257] WARN  org.eclipse.jetty.server.HttpChannel - ERROR_DISPATCH loop detected on Request[POST //be-nft4-app-04:8080/590715314303067]@5928fccb java.lang.IllegalStateException: ReadListener already set

12:27:09.743 [qtp2027944996-309] WARN  org.eclipse.jetty.server.HttpChannel - ERROR_DISPATCH loop detected on Request[POST //be-nft4-app-04:8080/590715314304262]@7d407fdb java.lang.IllegalStateException: ReadListener already set

 

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