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From "Martin Krasser (JIRA)" <j...@apache.org>
Subject [jira] Created: (CAMEL-2986) IllegalStateException in CamelContinuationServlet under heavy load
Date Thu, 22 Jul 2010 19:20:51 GMT
IllegalStateException in CamelContinuationServlet under heavy load
------------------------------------------------------------------

                 Key: CAMEL-2986
                 URL: https://issues.apache.org/activemq/browse/CAMEL-2986
             Project: Apache Camel
          Issue Type: Bug
          Components: camel-jetty
    Affects Versions: 2.4.0
            Reporter: Martin Krasser
            Assignee: Martin Krasser
             Fix For: 2.5.0


Reason is a race between continuation.suspend() and continuation.resume(). It can occur that
continuation.resume() is executed before continuation.suspend() leading to an IllegalStateException
thrown by Jetty:

{noformat}
java.lang.IllegalStateException: DISPATCHED,initial
    at org.eclipse.jetty.server.AsyncContinuation.dispatch(AsyncContinuation.java:364)
    at org.eclipse.jetty.server.AsyncContinuation.resume(AsyncContinuation.java:769)
    at org.apache.camel.component.jetty.CamelContinuationServlet$1.done(CamelContinuationServlet.java:85)
    at org.apache.camel.management.InstrumentationProcessor$1.done(InstrumentationProcessor.java:78)
    at org.apache.camel.processor.UnitOfWorkProcessor$1.done(UnitOfWorkProcessor.java:104)
    at org.apache.camel.processor.DefaultChannel$1.done(DefaultChannel.java:262)
    at org.apache.camel.processor.RedeliveryErrorHandler$1.done(RedeliveryErrorHandler.java:302)
    at org.apache.camel.management.InstrumentationProcessor$1.done(InstrumentationProcessor.java:78)
    at org.apache.camel.management.InstrumentationProcessor$1.done(InstrumentationProcessor.java:78)
{noformat}

This is the case when an async completion callback is faster than the thread that is concurrently
executing the {{if (continuation.isInitial())}} block. 

I'll commit a fix soon that also follows the recommendations in http://wiki.eclipse.org/Jetty/Feature/Continuations
to always call continuation.suspend() before registering the continuation with a callback
handler.


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