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From "Martin Krasser (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (CAMEL-2986) IllegalStateException in CamelContinuationServlet under heavy load
Date Thu, 22 Jul 2010 19:28:55 GMT

     [ https://issues.apache.org/activemq/browse/CAMEL-2986?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Krasser resolved CAMEL-2986.
-----------------------------------

    Resolution: Fixed

Fixed with revision 966815

> 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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