UIMA Ruta run errors using DKProCore Part-of-Speech Tagger (German Novels tutorial)

Question

When following this tutorial on UIMA Ruta for German Novels step by step, I get the following error upon running Main.ruta:

*SEVERE: Exception occurred
org.apache.uima.analysis_engine.AnalysisEngineProcessException
(...)
Caused by: java.io.IOException: Unable to locate model [de] in the 
following locations 
[classpath:/de/tudarmstadt/ukp/dkpro/core/treetagger/lib/tagger-de-
little-endian.par].  Make sure the environment variable 
'TREETAGGER_HOME' or 'TAGDIR' or the system property 'treetagger.home' 
point to the TreeTagger installation directory.*

I have verified the location of my TREETAGGER_HOME, which is set in my environment variables and in Eclipse. I also considered using a more recent verison of the treetagger and found the following errors:

1.7.0 SEVERE: Exception occurred org.apache.uima.analysis_engine.AnalysisEngineProcessException: Annotator processing failed. (...) Caused by: java.lang.ClassNotFoundException: de.tudarmstadt.ukp.dkpro.core.api.parameter.Messages at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 43 more

1.8.0 SEVERE: Exception occurred org.apache.uima.analysis_engine.AnalysisEngineProcessException: "Unsupported language [de]." at de.tudarmstadt.uk (...) Caused by: java.io.IOException: Unable to load resource [classpath:/de/tudarmstadt/ukp/dkpro/core/treetagger/lib/tagger-de- le.properties]: FileNotFoundException: No file found at [classpath:/de/tudarmstadt/ukp/dkpro/core/treetagger/lib/tagger-de- le.properties]

Upon seeing the error in the last attempt I checked once more the language parameters for German which are present under the necessary formats. Any advice on how to solve this?

Answer 1

The problem is, that the license of TreeTagger prohibits distributing it through Maven Central.

The is a long answer to that which includes how to build and install the TreeTagger models locally. You could look e.g. at the instructions here provided by the Excitement project which also uses DKPro Core.

I would recommend you try using another tagger instead of TreeTagger, e.g. the OpenNlpPosTagger from DKPro Core. Instead of the de.tudarmstadt.ukp.dkpro.core.treetagger-asl use de.tudarmstadt.ukp.dkpro.core.opennlp-asl in the pom.xml file.

<dependency>
  <groupId>de.tudarmstadt.ukp.dkpro.core</groupId>
  <artifactId>de.tudarmstadt.ukp.dkpro.core.opennlp-asl</artifactId>
  <version>1.5.0</version>
</dependency>

And in the POSTag.ruta script, try replacing the import/exec of TreeTaggerPosLemmaTT4J with these:

UIMAFIT de.tudarmstadt.ukp.dkpro.core.opennlp.OpenNlpPosTagger;
...snip...
Document{-> EXEC(OpenNlpPosTagger, {pos.POS, Lemma})}:

Warning: I haven't tried running this ;)

Disclaimer: I'm working on DKPro Core.