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https://issues.apache.org/jira/browse/UIMA-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jerry Cwiklik closed UIMA-1476.
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Resolution: Fixed
Fixed race condition that causes NullPointerException while initializing
multiple Uima AS clients in the same JVM
> Fix race condition in the UIMA As client when creating a shared JMS connection
> ------------------------------------------------------------------------------
>
> Key: UIMA-1476
> URL: https://issues.apache.org/jira/browse/UIMA-1476
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout
> Reporter: Jerry Cwiklik
> Assignee: Jerry Cwiklik
>
> When scaling a UIMA AS client in the same JVM there is a race condition that
> causes NullPointer exception. The exception is thrown when trying to access a
> JMSConnection object that is not yet initialized. The problem is in the
> setupConnection() method where the SharedConnection is initialized in two
> steps:
> 1) Default constructor creates an instance of the SharedConnection
> 2) setConnection method is called with a new Connection object
> The problem is that the code in initialize() method checks if the
> sharedConnection != null and if so proceeds to initializeProducer() method.
> So the race condition is that SharedConnection constructor finishes, a
> thread sees that it is not null and calls initializeProducer BEFORE the
> connection is set.
> Fix the code so that connection is passed in as an argument to a constructor
> assuring that as soon as the SharedConnection is instantiated it is fully
> initialized
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