Fix NPE in Uima AS Aggregate while handling getMeta responses
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Key: UIMA-1376
URL: https://issues.apache.org/jira/browse/UIMA-1376
Project: UIMA
Issue Type: Bug
Components: Async Scaleout
Reporter: Jerry Cwiklik
While merging type system from a delegate Uima AS the following exception is
thrown:
6/8/09 8:59:20 AM - 32:
org.apache.uima.aae.error.handler.GetMetaErrorHandler.handleError: WARNING: {0}
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:152)
at
org.apache.uima.aae.EECasManager_impl.defineCasPool(EECasManager_impl.java:60)
at
org.apache.uima.aae.AsynchAECasManager_impl.initialize(AsynchAECasManager_impl.java:98)
at
org.apache.uima.aae.AsynchAECasManager_impl.initialize(AsynchAECasManager_impl.java:86)
at
org.apache.uima.aae.controller.AggregateAnalysisEngineController_impl.mergeTypeSystem(AggregateAnalysisEngineController_impl.java:2182)
at
org.apache.uima.aae.handler.input.MetadataResponseHandler_impl.handle(MetadataResponseHandler_impl.java:133)
at
org.apache.uima.aae.handler.HandlerBase.delegate(HandlerBase.java:158)
at
org.apache.uima.aae.handler.input.ProcessResponseHandler.handle(ProcessResponseHandler.java:673)
at
org.apache.uima.adapter.jms.activemq.JmsInputChannel.onMessage(JmsInputChannel.java:665)
at
org.apache.uima.adapter.jms.activemq.ConcurrentMessageListener$1.run(ConcurrentMessageListener.java:163)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
it could be that this is caused when two threads simultaneously try to merge
their typesystems. This exception happens rarely, suggesting a race condition
of some sort or/and perhaps, that the core is not thread safe with respect to
merging typesystems in multiple threads. The latter is just a speculation.
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