Errors When Converting Csv To Arff In Android Using Weka

I'm sing the code and instructions found on the weka site https://weka.wikispaces.com/Converting+CSV+to+ARFF But for some reason its giving me errors. Notice I check to make sure

Solution 1:

try changing your code to

// load CSVCSVLoaderloader=newCSVLoader();
    if(null != inputFile){
        loader.setSource(inputFile);
        data = loader.getDataSet();
    }else{
        Log.e("ERROR","error the input file is null");
    }

try that and tell me if you get an error in the log cat and no Crash

Solution 2:

The source code you linked only contains a comment in weka.core.converters.ConverterUtils.java line 741, so I'm guessing that what you are actually using is the jar from here: https://www.pervasive.jku.at/Teaching/lvaInfo.php?key=346&do=uebungen

The problem there is that in the static class initializer, almost everything is commented out, leaving only line 741 that will fail because the static field m_FileLoaders is still null when m_FileLoaders.size() is called:

/** all available loaders (extension &lt;-&gt; classname). */protectedstatic Hashtable<String,String> m_FileLoaders;
[...]

// determine all loaders/saversstatic {
  Vector classnames;

  try {
    // generate properties // Note: does NOT work with RMI, hence m_FileLoadersCore/m_FileSaversCore/* GenericPropertiesCreator creator = new GenericPropertiesCreator();
       creator.execute(false);
       Properties props = creator.getOutputProperties();
       // init
       m_FileLoaders    = new Hashtable<String,String>();
       [...]
    */
    }
    catch (Exception e) {
      // ignore
    }
    finally {
      // loadersif (m_FileLoaders.size() == 0) {
      /*classnames = GenericObjectEditor.getClassnames(AbstractFileLoader.class.getName());
      [...]
      */
      }
    }
  }

All in all, my best guess is that the jar is broken, so either you fix it yourself or get a non-broken one.

(Btw: Another question with the same problem.)