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https://issues.apache.org/jira/browse/UIMA-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jerry Cwiklik updated UIMA-1238:
--------------------------------

    Attachment: uimaj-as-core-UIMA-1238-patch.txt

Fixes NPE in the Uima AS aggregate while trying to send a reply back a client. 
A check is made to make sure that the Input Cas Reference Id is not NULL before 
trying to store it in a message going back to the client. The input Cas 
Reference Id may be null if the CAS being returned to the client is *the* 
initial input CAS sent by the client application. This CAS does not have a 
parent.

> Fix NullPointerException When Sending Reply to Uima AS Client
> -------------------------------------------------------------
>
>                 Key: UIMA-1238
>                 URL: https://issues.apache.org/jira/browse/UIMA-1238
>             Project: UIMA
>          Issue Type: Bug
>          Components: Async Scaleout
>            Reporter: Jerry Cwiklik
>         Attachments: uimaj-as-core-UIMA-1238-patch.txt
>
>
> There is a NPE when sending a reply back to a client from Uima AS aggregate. 
> Caused by: java.lang.NullPointerException
>       at 
> java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:846)
>       at 
> org.apache.uima.aae.spi.transport.vm.UimaVmMessage.addStringProperty(UimaVmMessage.java:52)
>       at 
> org.apache.uima.aae.controller.AggregateAnalysisEngineController_impl.sendVMMessage(AggregateAnalysisEngineController_impl.java:1594)
>       at 
> org.apache.uima.aae.controller.AggregateAnalysisEngineController_impl.replyToClient(AggregateAnalysisEngineController_impl.java:1552)
>       at 
> org.apache.uima.aae.controller.AggregateAnalysisEngineController_impl.finalStep(AggregateAnalysisEngineController_impl.java:1358)
>       ... 13 more
> It seems that the code is trying to set a property with a value of NULL which 
> is not allowed

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