[jira] [Commented] (UIMA-2308) UIMA CasCreationUtils throws NPE when multiple threads in UIMA AS call defineCasPool

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

    [ https://issues.apache.org/jira/browse/UIMA-2308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13168592#comment-13168592 ] 

Marshall Schor commented on UIMA-2308:
--------------------------------------

Jerry points out that the key idea is to use class-level, not instance-level synchronization object for this.  (There already is an instance level synchronization.)  Also, he says this is more a work-around, rather than a complete understanding of what was going wrong, so people can avoid this issue until it is perhaps fixed in a better way in the future, after a successful root-cause analysis.  The work-around is only implemented in the UIMA-AS usage of the call to defineCasPool().
                
> UIMA CasCreationUtils throws NPE when multiple threads in UIMA AS call defineCasPool
> ------------------------------------------------------------------------------------
>
>                 Key: UIMA-2308
>                 URL: https://issues.apache.org/jira/browse/UIMA-2308
>             Project: UIMA
>          Issue Type: Bug
>            Reporter: Jerry Cwiklik
>            Assignee: Jerry Cwiklik
>             Fix For: 2.4.0AS
>
>
> UIMA CasCreationUtils throws NPE from setupTypePriorities() when UIMA AS scales AEs in multiple threads. The NPE is due to thread safety issue in UIMA caused by lazy initialization of CAS pools. Seems to be triggered when large type system is used. Synchronize UIMA AS org.apache.uima.aae.EECasManager_impl.defineCasPool() to make sure only one thread at a time executes the code.

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