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https://issues.apache.org/jira/browse/UIMA-1223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12656169#action_12656169
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Eddie Epstein commented on UIMA-1223:
-------------------------------------
Initializing an aggregate service failed with the stack below.
It appears that this is due to a thread synchronization problem with the
unregisteredDelegateList.
Jerry, please see TODO questions associated with this change.
java.lang.NullPointerException
at
org.apache.uima.aae.controller.AggregateAnalysisEngineController_impl.mergeTypeSystem(AggregateAnalysisEngineController_impl.java:1995)
at
org.apache.uima.aae.handler.input.MetadataResponseHandler_impl.handle(MetadataResponseHandler_impl.java:76)
at
org.apache.uima.aae.handler.input.MetadataRequestHandler_impl.handle(MetadataRequestHandler_impl.java:84)
at
org.apache.uima.aae.handler.HandlerBase.delegate(HandlerBase.java:157)
at
org.apache.uima.aae.handler.input.ProcessResponseHandler.handle(ProcessResponseHandler.java:696)
at
org.apache.uima.aae.handler.HandlerBase.delegate(HandlerBase.java:157)
at
org.apache.uima.aae.handler.input.ProcessRequestHandler_impl.handle(ProcessRequestHandler_impl.java:880)
at
org.apache.uima.aae.spi.transport.vm.UimaVmMessageListener.onMessage(UimaVmMessageListener.java:99)
at
org.apache.uima.aae.spi.transport.vm.UimaVmMessageDispatcher$1.run(UimaVmMessageDispatcher.java:66)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:595)
> Annotators should be initialized in the same thread that their process method
> will later be called on
> -----------------------------------------------------------------------------------------------------
>
> Key: UIMA-1223
> URL: https://issues.apache.org/jira/browse/UIMA-1223
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout
> Affects Versions: 2.2.2
> Reporter: Adam Lally
> Assignee: Jerry Cwiklik
> Attachments: uimaj-as-activemq-UIMA-1223-patch.txt,
> uimaj-as-core-UIMA-1223-patch.txt
>
>
> It is more convenient if an annotator is initialized on the same thread that
> it is later called on. Some components may use thread-local data and they
> won't work in UIMA-AS currently. Another advantage of doing the
> initialization in the processing thread is that you could initialize multiple
> instances of the annotator in parallel instead of sequentially, which may be
> faster for a multi-core machine.
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