Fix NPE in Uima AS Aggregate while handling getMeta responses -------------------------------------------------------------
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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.