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https://issues.apache.org/jira/browse/UIMA-2414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jerry Cwiklik closed UIMA-2414.
-------------------------------
Resolution: Fixed
Modified Delegate class to lock access to outstanding CAS list. Removed
getDelegateCasesPendingReply() as it returned the list to clients (callers)
which led to the ConcurrentModificationException. Instead provided a new API
the clients can call to get an array of CAS Ids that are outstanding. This
approach localizes direct access to the outstanding CAS list.
> Fix ConcurrentModificationException in uima-as client
> -----------------------------------------------------
>
> Key: UIMA-2414
> URL: https://issues.apache.org/jira/browse/UIMA-2414
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout
> Affects Versions: 2.3.1AS
> Reporter: Jerry Cwiklik
> Fix For: 2.4.0AS
>
>
> The uima-as client throws
> org.apache.uima.adapter.jms.client.BaseUIMAAsynchronousEngineCommon_impl WARN
> 2012-05-25 01:08:41,391 [BaseUIMAAsynchronousEngineCommon_impl$2.2] -
> java.util.ConcurrentModificationException at
> java.util.AbstractList$SimpleListIterator.next(AbstractList.java:64)
> at
> org.apache.uima.adapter.jms.client.BaseUIMAAsynchronousEngineCommon_impl.handleServiceInfo(BaseUIMAAsynchronousEngineCommon_impl.java:1121)
>
> while handling ServiceInfo message from a remote service. The service sends
> this message right after it picks up a request msg from a queue and before
> calling AE's process method. The msg includes service host ip, process PID,
> and a service temp queue for receiving FreeCas requests (if the service is a
> CM). This temp queue is also used by the client to send a a Stop request to
> the CM to abort generation of child CASes. The above exception happens while
> iterating over a list of outstanding CASes. The code is trying to locate a
> matching CAS (by id) and to associate with it received temp reply queue in
> case application wants to abort the CAS. Access to the list is not
> synchronized in this case and causes the exception. Refactor client code to
> prevent concurrent access to the list.
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