ResourceManager initialization is not thread-safe
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Key: UIMA-1248
URL: https://issues.apache.org/jira/browse/UIMA-1248
Project: UIMA
Issue Type: Bug
Components: Core Java Framework
Affects Versions: 2.2.2
Reporter: Adam Lally
Assignee: Adam Lally
Priority: Minor
If multiple threads concurrently call UIMAFramework.produceAnalysisEngine and
pass the same instance of ResourceManager as an argument, you can get
intermittent exceptions in the ResourceManager such as:
java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at java.util.ArrayList.ensureCapacity(ArrayList.java:170)
at java.util.ArrayList.add(ArrayList.java:351)
at
org.apache.uima.resource.impl.CasManager_impl.addMetaData(CasManager_impl.java:82)
at
org.apache.uima.analysis_engine.impl.AnalysisEngineImplBase.initialize(AnalysisEngineImplBase.java:115)
at
org.apache.uima.analysis_engine.impl.AggregateAnalysisEngine_impl.initialize(AggregateAnalysisEngine_impl.java:126)
The workaround is to synchronize the calls to
UIMAFramework.produceAnalysisEngine. However, this is suboptimal if annotator
initialization is expensive and you want it to be run in parallel on multiple
cores. We should consider adding synchronization to the ResourceManager (and
the classes it delegates to such as CasManager) to allow this to work.
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