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From "Claus Ibsen (JIRA)" <>
Subject [jira] [Updated] (CAMEL-9237) ConcurrentModificationException when adding/removing routes in multiple threads
Date Tue, 20 Oct 2015 14:03:27 GMT


Claus Ibsen updated CAMEL-9237:
    Priority: Minor  (was: Major)

> ConcurrentModificationException when adding/removing routes in multiple threads
> -------------------------------------------------------------------------------
>                 Key: CAMEL-9237
>                 URL:
>             Project: Camel
>          Issue Type: Bug
>          Components: camel-core, tests
>    Affects Versions: 2.16.0
>            Reporter: Chris Ribble
>            Priority: Minor
> Dynamically adding or removing routes in multiple threads can cause a ConcurrentModificationException.
For example, in my project's tests, we dynamically mock out a large number of routes. When
we run these tests serially it works fine, but in parallel we almost always see a ConcurrentModificationException
when DefaultCamelContext passes the routeDefinitions list to RouteDefinitionHelper.validateUniqueIds
> I propose that we fix this by making routeDefinitions (in DefaultCamelContext) a CopyOnWriteArrayList
instead of an ArrayList. Apparently this was already done for the lifecycleStrategies list,
presumably for the same reason.
> It's also curious that the accessors for this list are marked synchronized. Since the
references are final, there's no reason to use volatile instead, so it seems like the synchronized
here is pointless.
> I also think we should consider doing the same for restDefinitions, since there is nothing
preventing this list from being modified in multiple threads.

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