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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