Richard Eckart de Castilho created UIMA-5597:
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Summary: uv3: FsGenerators may end up all being null
Key: UIMA-5597
URL: https://issues.apache.org/jira/browse/UIMA-5597
Project: UIMA
Issue Type: Bug
Components: Core Java Framework
Affects Versions: 3.0.0SDK-beta
Reporter: Richard Eckart de Castilho
There appears to be a problem with the initialization of the FS generators when
many classloaders are involved. uimaFIT configures all component with dedicated
resource managers and these are all configured with a parent classloader,
causing many UimaClassLoaders to be around in uimaFIT-based setups.
Usually, this seems to work well in UIMA v2 and UIMA v3. However, presently CAS
multipliers seem to be a problem in UIMA v3.
I tried to debug this to some degree based on a unit test in DKPro Core and
ended up in the following code in
`FSClassRegistry.getGeneratorsForClassLoader(...)`:
{noformat}
// skip entering a generator in the result if
// in a pear setup, and this cl is not the cl that loaded the JCas
class.
// See method comment for why.
if (!isPear || jcci.isPearOverride(cl)) {
r[ti.getCode()] = (FsGenerator3) jcci.generator;
}
{noformat}
In this particular unit test, the code is called 3 times.
The first two times when the CAS that is to be passed to the pipeline
components is created by the uimaFIT JCasIterator. These first two times appear
ok - the feature generators array is filled.
{noformat}
1) cl := sun.misc.Launcher$AppClassLoader
isPear := false
jcci.isPearOverride(cl) := true
FSClassRegistry.getGeneratorsForClassLoader(ClassLoader, boolean,
TypeSystemImpl) line: 879
TypeSystemImpl.getGeneratorsForClassLoader(ClassLoader, boolean) line:
2630
TypeSystemImpl.commit(ClassLoader) line: 1378
TypeSystemImpl.commit() line: 1313
TypeSystemImpl.<clinit>() line: 2484
CASFactory.createTypeSystem() line: 126
CASImpl.<init>(TypeSystemImpl, int) line: 885
CASImpl.<init>() line: 908
CASFactory.createCAS() line: 48
CasCreationUtils.doCreateCas(TypeSystem, TypeSystemDescription,
TypePriorities, FsIndexDescription[], Properties, ResourceManager) line: 604
CasCreationUtils.createCas(Collection<MetaDataObject>, Properties,
ResourceManager) line: 292
JCasIterator.<init>(CollectionReader, AnalysisEngine...) line: 90
JCasIterable.iterator() line: 79
JCasIterable.iterator() line: 1
AssertAnnotations.assertTransformedText(String, String, String,
AnalysisEngineDescription...) line: 897
RegexBasedTokenTransformerTest.test() line: 45
{noformat}
{noformat}
2) cl := org.apache.uima.internal.util.UIMAClassLoader@50378a4
isPear := false
jcci.isPearOverride(cl) := false
FSClassRegistry.getGeneratorsForClassLoader(ClassLoader, boolean,
TypeSystemImpl) line: 879
TypeSystemImpl.getGeneratorsForClassLoader(ClassLoader, boolean) line:
2630
TypeSystemImpl.commit(ClassLoader) line: 1378
CASImpl.commitTypeSystem() line: 1529
CasCreationUtils.doCreateCas(TypeSystem, TypeSystemDescription,
TypePriorities, FsIndexDescription[], Properties, ResourceManager) line: 613
CasCreationUtils.createCas(Collection<MetaDataObject>, Properties,
ResourceManager) line: 292
JCasIterator.<init>(CollectionReader, AnalysisEngine...) line: 90
JCasIterable.iterator() line: 79
JCasIterable.iterator() line: 1
AssertAnnotations.assertTransformedText(String, String, String,
AnalysisEngineDescription...) line: 897
RegexBasedTokenTransformerTest.test() line: 45
{noformat}
The third time in the FlowController. This time `isPear` is `true` causing the
FS generators array to be all null. Mind, I'm not using PEARs, I only set the
parent classloader for the resource managers, no custom classpath URLs.
{noformat}
3) cl = org.apache.uima.internal.util.UIMAClassLoader@4b2bac3f
isPear := true
jcci.isPearOverride(cl) := false
FSClassRegistry.getGeneratorsForClassLoader(ClassLoader, boolean,
TypeSystemImpl) line: 891
TypeSystemImpl.getGeneratorsForClassLoader(ClassLoader, boolean) line:
2630
CASImpl$SharedViewData.switchClassLoader(ClassLoader) line: 724
CASImpl.switchClassLoaderLockCasCL(ClassLoader) line: 3568
FlowControllerContainer.computeFlow(CAS) line: 226
ASB_impl$AggregateCasIterator.<init>(ASB_impl, CAS) line: 406
ASB_impl.process(CAS) line: 344
AggregateAnalysisEngine_impl.processAndOutputNewCASes(CAS) line: 271
AggregateAnalysisEngine_impl(AnalysisEngineImplBase).process(CAS) line:
269
AggregateAnalysisEngine_impl(AnalysisEngineImplBase).process(JCas)
line: 284
JCasIterator.next() line: 142
JCasIterator.next() line: 1
AssertAnnotations.assertTransformedText(String, String, String,
AnalysisEngineDescription...) line: 897
RegexBasedTokenTransformerTest.test() line: 45
{noformat}
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