[jira] [Resolved] (UIMA-1248) ResourceManager initialization is not thread-safe

["Marshall Schor (JIRA)" <de...@uima.apache.org>]

     [ https://issues.apache.org/jira/browse/UIMA-1248?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Marshall Schor resolved UIMA-1248.
----------------------------------

       Resolution: Fixed
    Fix Version/s: 2.6.0SDK
         Assignee: Marshall Schor  (was: Adam Lally)

> ResourceManager initialization is not thread-safe
> -------------------------------------------------
>
>                 Key: UIMA-1248
>                 URL: https://issues.apache.org/jira/browse/UIMA-1248
>             Project: UIMA
>          Issue Type: Bug
>          Components: Core Java Framework
>    Affects Versions: 2.2.2, 2.3
>            Reporter: Adam Lally
>            Assignee: Marshall Schor
>            Priority: Minor
>             Fix For: 2.6.0SDK
>
>
> If multiple threads concurrently call UIMAFramework.produceAnalysisEngine and pass the same instance of ResourceManager as an argument, you can get intermittent exceptions in the ResourceManager such as:
> java.lang.ArrayIndexOutOfBoundsException
>   at java.lang.System.arraycopy(Native Method)
>   at java.util.ArrayList.ensureCapacity(ArrayList.java:170)
>   at java.util.ArrayList.add(ArrayList.java:351)
>   at org.apache.uima.resource.impl.CasManager_impl.addMetaData(CasManager_impl.java:82)
>   at org.apache.uima.analysis_engine.impl.AnalysisEngineImplBase.initialize(AnalysisEngineImplBase.java:115)
>   at org.apache.uima.analysis_engine.impl.AggregateAnalysisEngine_impl.initialize(AggregateAnalysisEngine_impl.java:126)
> The workaround is to synchronize the calls to UIMAFramework.produceAnalysisEngine.   However, this is suboptimal if annotator initialization is expensive and you want it to be run in parallel on multiple cores.  We should consider adding synchronization to the ResourceManager (and the classes it delegates to such as CasManager) to allow this to work.



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