Hi ! Does some had the same problem ?

The service can't work anymore. ( I did't use eclipse, only the jar )

This is the error when I call a wdf.getdescription :

 wikiAnswer = wdf.getDescription(word) # recupere la description su wikidata
        at org.wikidata.wdtk.wikibaseapi.ApiConnection.<init>(ApiConnection.java:185)
        at org.wikidata.wdtk.wikibaseapi.ApiConnection.getWikidataApiConnection(ApiConnection.java:205)
        at org.wikidata.wdtk.wikibaseapi.WikibaseDataFetcher.getWikidataDataFetcher(WikibaseDataFetcher.java:77)
        at org.myrobotlab.service.WikiDataFetcher.getWiki(WikiDataFetcher.java:72)
        at org.myrobotlab.service.WikiDataFetcher.getDescription(WikiDataFetcher.java:93)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)

java.lang.NoClassDefFoundError: java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/ObjectMapper

        at org.python.core.Py.JavaError(Py.java:546)
        at org.python.core.Py.JavaError(Py.java:537)
        at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:188)
        at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:204)
        at org.python.core.PyObject.__call__(PyObject.java:478)
        at org.python.core.PyObject.__call__(PyObject.java:482)
        at org.python.core.PyMethod.__call__(PyMethod.java:141)
        at org.python.pycode._pyx80.askWiki$1(INMOOV-AI_KnowledgeFetchers.py:62)
        at org.python.pycode._pyx80.call_function(INMOOV-AI_KnowledgeFetchers.py)
        at org.python.core.PyTableCode.call(PyTableCode.java:167)
        at org.python.core.PyBaseCode.call(PyBaseCode.java:188)
        at org.python.core.PyFunction.__call__(PyFunction.java:446)
        at org.python.pycode._pyx112.f$0(<string>:1)
        at org.python.pycode._pyx112.call_function(<string>)
        at org.python.core.PyTableCode.call(PyTableCode.java:167)
        at org.python.core.PyCode.call(PyCode.java:18)
        at org.python.core.Py.runCode(Py.java:1386)
        at org.python.core.Py.exec(Py.java:1430)
        at org.python.util.PythonInterpreter.exec(PythonInterpreter.java:267)
        at org.myrobotlab.service.Python$PIThread.run(Python.java:161)
Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/ObjectMapper
        at org.wikidata.wdtk.wikibaseapi.ApiConnection.<init>(ApiConnection.java:185)
        at org.wikidata.wdtk.wikibaseapi.ApiConnection.getWikidataApiConnection(ApiConnection.java:205)
        at org.wikidata.wdtk.wikibaseapi.WikibaseDataFetcher.getWikidataDataFetcher(WikibaseDataFetcher.java:77)
        at org.myrobotlab.service.WikiDataFetcher.getWiki(WikiDataFetcher.java:72)
        at org.myrobotlab.service.WikiDataFetcher.getDescription(WikiDataFetcher.java:93)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:186)
        ... 17 more
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.ObjectMapper
        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)
        ... 27 more

Mats

8 years 1 month ago

Hi Moz4r

Not that it helps you much currenty, but I can confirm that the same problem occurs when using Eclipse too.

/Mats

kwatters

8 years 1 month ago

So.. this was probably me and grog that broke this. Turns out that the original wiki data client jar file bundled together a bunch of additional libraries that caused version conflicts, especially with the http client libraries.

Long story short we seem to have missed a library and that is the error you are seeing.

Best way to avoid this is to ensure that there is a unit test for this service. I'm away from my laptop at the moment, but maybe later tonight or tomorrow I'll check in a fix.

GroG

8 years 1 month ago

Ehi !

Yep.. previously it included everything in a single jar.  This is not a good plan because it prevents the ability to attempt dependency version management.

HttpClient versions were colliding with wiki data fetcher and other services.

I get an error in eclipse too .. was trying to chase dependencies down.

Whenever you see fasterxml jackson - its the json parser (or lack thereof)

Started manually chasing down dependencies .. but then found 

https://www.mediawiki.org/wiki/Wikidata_Toolkit - where they have a maven pom dependency definition YAY !

Maven can be wonderful sometimes:
All I did was ->  mvn dependency:copy-dependencies and magically all the dependency libraries were downloaded.

I am going to put all the necessary ones in the repo..  

This should fix it for all.

Junit testing should occur !!! 

Additionally, going forward the libraries defined in Maven central should be utilized (Ivy has this capability) and removed from the  github library.

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