Synchronize AsynchAECasManager initialize() method to fix NPE while merging
type systems
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Key: UIMA-1580
URL: https://issues.apache.org/jira/browse/UIMA-1580
Project: UIMA
Issue Type: Bug
Components: Async Scaleout
Reporter: Jerry Cwiklik
Fix For: 2.3AS
A NPE exception occurs intermittently while merging type systems. There seems
to be a race condition where multiple threads attempt to initialize cas pools.
The result is an exception that looks like this:
org.apache.uima.aae.error.AsynchAEException: java.lang.NullPointerException
at
org.apache.uima.aae.controller.AggregateAnalysisEngineController_impl.mergeTypeSystem(AggregateAnalysisEngineController_impl.java:2430)
at
org.apache.uima.aae.handler.input.MetadataResponseHandler_impl.handle(MetadataResponseHandler_impl.java:140)
at
org.apache.uima.aae.handler.input.MetadataRequestHandler_impl.handle(MetadataRequestHandler_impl.java:78)
at org.apache.uima.aae.handler.HandlerBase.delegate(HandlerBase.java:149)
at
org.apache.uima.aae.handler.input.ProcessResponseHandler.handle(ProcessResponseHandler.java:664)
at org.apache.uima.aae.handler.HandlerBase.delegate(HandlerBase.java:149)
at
org.apache.uima.aae.handler.input.ProcessRequestHandler_impl.handle(ProcessRequestHandler_impl.java:951)
at
org.apache.uima.aae.spi.transport.vm.UimaVmMessageListener.onMessage(UimaVmMessageListener.java:107)
at
org.apache.uima.aae.spi.transport.vm.UimaVmMessageDispatcher$1.run(UimaVmMessageDispatcher.java:70)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException
at org.apache.uima.resource.CasDefinition.<init>(CasDefinition.java:66)
at
org.apache.uima.resource.impl.CasManager_impl.getCasDefinition(CasManager_impl.java:94)
at
org.apache.uima.resource.impl.CasManager_impl.createNewCas(CasManager_impl.java:196)
at org.apache.uima.util.CasPool.fillPool(CasPool.java:319)
at org.apache.uima.util.CasPool.<init>(CasPool.java:191)
at
org.apache.uima.resource.impl.CasManager_impl.defineCasPool(CasManager_impl.java:174)
at
org.apache.uima.resource.impl.CasManager_impl.defineCasPool(CasManager_impl.java:161)
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