NullPointerException

[Sofie Vandaele]

I tried this ( http://goo.gl/sIOUFu ) example but I receive an NullPointerException as shown in the attached image.

My RapidMiner process looks exact the same as in the example.

The SPARQL endpoints I tried are: http://wifo5-04.informatik.uni-mannheim.de/eurostat/sparql/ and http://eurostat.linked-statistics.org/sparql

It looks like the only SPARQL endpoint still working is http://dbpedia.org/sparql. Am I right?

[Petar Ristoski]

Hi Sofie,

The Eurostat endpoint is working just fine.

Did you implement the process by yourself, or you imported it from myExperiments? 

If you didn't import it from myExperiments, I would advise you to do so. Here is a nice video explaining step by step how to import a workflow from myexperiment directly into RapiMiner (the import starts at 2:50): https://www.youtube.com/watch?v=Ws5EbyeJ_VU

After you import the workflow, you have to create new SPARQL connection for Eurostat (explained here http://dws.informatik.uni-mannheim.de/en/research/rapidminer-lod-extension/rapidminer-lod-extension-example-reading-and-analyzing-data/), using this endpoint: http://wifo5-04.informatik.uni-mannheim.de/eurostat/sparql

If you still have problems running the process, please send me the process log.

Cheers,

Petar

[Petar Ristoski]

The myexperiment workflow name is: Using Linked Open Data from Eurostat as Background Knowledge