Hi all,
I have been trying today to get the Java library Wikidata-Toolkit
going, but about to give up... I keep running with both 0.3.0 and
current master into a NullPointerException... I thought it was how I
called the code, and did add several System.out calls, and in the end
just tried to get it running from the command line... I tried the
example from the website (though replaced the Dump examples, which I
don't see in master; btw, "mvn test" runs fine) using a pristine
master:
$ cd wdtk-examples/
$ mvn compile
$ mvn exec:java
-Dexec.mainClass="org.wikidata.wdtk.examples.EntityStatisticsProcessor"
In doing so, I get the same NPE:
********************************************************************
*** Wikidata Toolkit: EntityStatisticsProcessor
***
*** This program will download and process dumps from Wikidata.
*** It will print progress information and some simple statistics.
*** Results about property usage will be stored in a CSV file.
*** See source code for further details.
********************************************************************
2015-01-17 16:53:00 INFO - Using download directory
/home/egonw/var/Projects/GitHub/Wikidata-Toolkit/wdtk-examples/dumpfiles/wikidatawiki
[WARNING]
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:293)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at
org.wikidata.wdtk.dumpfiles.DumpProcessingController.processDumpFile(DumpProcessingController.java:470)
at
org.wikidata.wdtk.dumpfiles.DumpProcessingController.processMostRecentDump(DumpProcessingController.java:456)
at
org.wikidata.wdtk.dumpfiles.DumpProcessingController.processMostRecentJsonDump(DumpProcessingController.java:426)
at
org.wikidata.wdtk.examples.ExampleHelpers.processEntitiesFromWikidataDump(ExampleHelpers.java:158)
at
org.wikidata.wdtk.examples.EntityStatisticsProcessor.main(EntityStatisticsProcessor.java:88)
... 6 more
I tried finding what goes wrong, but cannot grasp all the magic that
is going on... the directory it reports was created, but is empty...
$ mvn --version
Apache Maven 3.0.5
Maven home: /usr/share/maven
Java version: 1.7.0_65, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-7-openjdk-i386/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.16.0-4-686-pae", arch: "i386", family: "unix"
Can someone give me some pointers where and how it is testing of dump
files exist? Is this problem something platform dependent?
Thanks,
Egon
--
E.L. Willighagen
Department of Bioinformatics - BiGCaT
Maastricht University (http://www.bigcat.unimaas.nl/)
Homepage: http://egonw.github.com/
LinkedIn: http://se.linkedin.com/in/egonw
Blog: http://chem-bla-ics.blogspot.com/
PubList: http://www.citeulike.org/user/egonw/tag/papers
ORCID: 0000-0001-7542-0286
ImpactStory: https://impactstory.org/EgonWillighagen
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