[UIMA-6243] JCas returns Annotation when asked for a specific subtype

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.10.4SDK, 3.1.1SDK
• Fix Version/s: 2.11.0SDK, 3.2.0SDK
• Component/s: UIMA
• Assignee: Richard Eckart de Castilho
• Reporter: Richard Eckart de Castilho
• Created: 10/Jun/20 18:55
• Updated: 06/Oct/20 15:13
• Resolved: 06/Oct/20 15:13

Description

In a specific classloader topology, a fully initialized JCas with theoretic access to the JCas wrappers of a given type will not return that type but instead returns an instance of Annotation. This leads to an exception like this:

org.apache.uima.analysis_engine.AnalysisEngineProcessException: Annotator processing failed.    
	at org.apache.uima.analysis_engine.impl.PrimitiveAnalysisEngine_impl.callAnalysisComponentProcess(PrimitiveAnalysisEngine_impl.java:427)
	at org.apache.uima.analysis_engine.impl.PrimitiveAnalysisEngine_impl.innerCall(PrimitiveAnalysisEngine_impl.java:329)
	at org.apache.uima.analysis_engine.impl.PrimitiveAnalysisEngine_impl.processAndOutputNewCASes(PrimitiveAnalysisEngine_impl.java:321)
	at org.apache.uima.analysis_engine.impl.AnalysisEngineImplBase.process(AnalysisEngineImplBase.java:269)
	at org.apache.uima.analysis_engine.impl.AnalysisEngineImplBase.process(AnalysisEngineImplBase.java:284)
	at org.apache.uima.cas.test.JCasClassLoaderTest.thatTypeSystemCanComeFromItsOwnClassLoader(JCasClassLoaderTest.java:126)
	... snip ...
Caused by: java.lang.ClassCastException: org.apache.uima.jcas.tcas.Annotation cannot be cast to org.apache.uima.cas.test.Token
	at java.util.Iterator.forEachRemaining(Iterator.java:116)
	at org.apache.uima.cas.test.JCasClassLoaderTest$FetchTheTokenAnnotator.process(JCasClassLoaderTest.java:166)
	at org.apache.uima.analysis_component.JCasAnnotator_ImplBase.process(JCasAnnotator_ImplBase.java:48)
	at org.apache.uima.analysis_engine.impl.PrimitiveAnalysisEngine_impl.callAnalysisComponentProcess(PrimitiveAnalysisEngine_impl.java:411)
	... 28 more

Looks like this is a UIMAv2 issue only. When running the test against the UIMAv3 master (commit 0211057ad), I do not get any ClassCastException.

Issue Links

• links to: GitHub Pull Request #46
• links to: GitHub Pull Request #60
• links to: PR with unit test provoking the issue