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From Martin Wunderlich <martin...@gmx.net>
Subject Re: NPE when trying to get casProcessors from CPE description
Date Sun, 12 Jul 2015 18:49:00 GMT

I just want to briefly reveal how this situation has been resolved. 

First, Richard was so kind to contact me via chat to check the Maven dependencies. We discovered
that two different versions of DKPro Lab were referenced (one of them rather indirectly, from
the similarity project). Richard quickly resolved this with a commit and I re-installed the
snapshot version locally. However, this didn’t fix this situation listed below. But kudos
to Richard who helped out and made me feel less lonely on this hot summer sunday. 

As a next step, I tried to isolate the problem. So, I cloned the TC github repo, imported
that into a new Eclipse workspace and ran the example there. This worked. So, I figured it
might be something in my particular workspace arrangement. I had my forked TC project loaded
there, which I now set to the master branch of the original repo’s snapshot version. This
didn’t help either. Then, I re-installed the newly cloned version using maven install, removed
the TC project from the eclipse workspace, imported only the examples project and ran the
example again. Now it worked. I went back to my actual project and - lo and behold - the pair-wise
classification now worked, too. 

I still don’t know what caused the problem. It might have been some of my code changes or
config changes to the forked copy of the project. Anyway, I am documenting this here in case
someone else runs into a similar situation. 



> Am 12.07.2015 um 16:39 schrieb Martin Wunderlich <martin_wu@gmx.net>:
> As a side-note*, the problem does not occur when I run the experiment from the branch
of the 0.7.0 tag version of DKPro TC. In that version, PairTwentyNewsgroupsDemo runs fine
without the NPE. Not sure, if this observation adds to the clarification or rather to the
> Cheers, 
> Martin
> * (and we should probably move this conversation to the DKpro list, which I am putting
on CC now, so feel free to respond there)
>> Am 12.07.2015 um 13:23 schrieb Martin Wunderlich <martin_wu@gmx.net <mailto:martin_wu@gmx.net>>:
>> Hi Richard, 
>> I have based this experiment on the PairTwentyNewsgroupsDemo from the DKPro examples.
The CPE would be build during the experiment execution, I guess. 
>> I have just tried to re-run the example, but now I am getting the same exception:

>> (using the 0.8.0 snapshort version of TC). 
>> 2015-07-12 11:01:31 DEBUG [main] (DefaultLoggingService) - [MetaInfoTask-TwentyNewsgroupsTrainTest-966ab1a7-2874-11e5-b53c-37fcf6476d26]
Problem stack trace:
>> java.lang.NullPointerException
>> 	at org.apache.uima.fit.cpe.CpeBuilder.createCpe(CpeBuilder.java:159)
>> 	at de.tudarmstadt.ukp.dkpro.lab.uima.engine.cpe.CpeExecutionEngine.run(CpeExecutionEngine.java:93)
>> 	at de.tudarmstadt.ukp.dkpro.lab.task.impl.BatchTask.runNewExecution(BatchTask.java:350)
>> 	at de.tudarmstadt.ukp.dkpro.lab.task.impl.BatchTask.executeConfiguration(BatchTask.java:255)
>> 	at de.tudarmstadt.ukp.dkpro.lab.task.impl.BatchTask.execute(BatchTask.java:185)
>> 	at de.tudarmstadt.ukp.dkpro.tc.ml.ExperimentTrainTest.execute(ExperimentTrainTest.java:91)
>> 	at de.tudarmstadt.ukp.dkpro.lab.engine.impl.ExecutableTaskEngine.run(ExecutableTaskEngine.java:55)
>> 	at de.tudarmstadt.ukp.dkpro.lab.engine.impl.DefaultTaskExecutionService.run(DefaultTaskExecutionService.java:48)
>> 	at de.tudarmstadt.ukp.dkpro.lab.Lab.run(Lab.java:97)
>> 	at de.tudarmstadt.ukp.dkpro.tc.examples.single.pair.PairTwentyNewsgroupsDemo.runTrainTest(PairTwentyNewsgroupsDemo.java:147)
>> 	at de.tudarmstadt.ukp.dkpro.tc.examples.single.pair.PairTwentyNewsgroupsDemo.main(PairTwentyNewsgroupsDemo.java:84)
>> Cheers, 
>> Martin
>>> Am 11.07.2015 um 19:10 schrieb Richard Eckart de Castilho <rec@apache.org
>>> Hi,
>>> how to you build your CPE? The CAS processors should be set during setAnalysisEngine(...).
>>> Cheers,
>>> -- Richard 
>>> On 11.07.2015, at 10:18, Martin Wunderlich <martin_wu@gmx.net <mailto:martin_wu@gmx.net>>
>>>> Hi  all, 
>>>> I am  trying to run a pair-wise classification experiment using the DKPro
TC framework. The execution fails during the meta-info stage due to a NullPointerException
that originates in the CpeBuilder class from UIMAfit v.2.1.0 (hence the post to this list
and not the DKpro list). I had a closer look at the code and the NPE is triggered at the following
line in the CpeBuilder: 
>>>> cpeDesc.getCpeCasProcessors().setPoolSize(maxProcessingUnitThreadCount +
>>>> The underlying root cause is that the casProcessors object returned by the
call to cpeDesc is Null, but I don’t understand why. The cpeDesc lists a number of fields
as having Null values: 
>>>> org.apache.uima.collection.impl.metadata.cpe.CpeDescriptionImpl: 
>>>> casInitializer = NULL
>>>> configParameterSettings = NULL
>>>> configurationParameterSettings = NULL
>>>> import = NULL
>>>> sofaNameMappings = NULL
>>>> configurationParameterSettings = NULL
>>>> cpeCasProcessors = NULL
>>>> outputQueue = NULL
>>>> startAt = NULL
>>>> startingEntityId = NULL
>>>> Unfortunately, I am not too familiar with the inner workings of the UIMA(fit)
framework so I am not sure how, why and where these fields were set to Null. 
>>>> Could someone perhaps point me in the right direction where I should dig
deeper to identify the cause for this problem? 
>>>> Thanks a lot. 
>>>> Cheers, 
>>>> Martin

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