"CSVDataReader Error: No operator description object"

wannin0

Good day!!

I am currently programming including RapidMiner in a Java application. It is supposed to read a model and a csv file. These will be the inputs for ModelApplier.

To read the csv file, I used CSVDataReader. But when I compile my program, this error occured:

2011-03-24 21:54:24 SEVERE: null (ApplyModel.<init>())
com.rapidminer.operator.OperatorCreationException: No operator description object given for 'com.rapidminer.operator.io.CSVDataReader'

Here is the source code:

import com.rapidminer.RapidMiner;
import com.rapidminer.example.Example;
import com.rapidminer.example.ExampleSet;
import com.rapidminer.operator.IOContainer;
import com.rapidminer.operator.ModelApplier;
import com.rapidminer.operator.Operator;
import com.rapidminer.operator.OperatorCreationException;
import com.rapidminer.operator.OperatorException;
import com.rapidminer.operator.io.CSVDataReader;
import com.rapidminer.tools.OperatorService;
import com.rapidminer.operator.io.ModelLoader;
import com.rapidminer.operator.nio.CSVExampleSource;
import com.rapidminer.operator.ports.InputPort;
import com.rapidminer.operator.ports.OutputPort;
import java.util.Iterator;
import java.util.logging.Level;
import java.util.logging.Logger;

public class ApplyModel {


    public ApplyModel(String modelFile, String unlabelledFile){
       
     try {
            
            RapidMiner.init();

            com.rapidminer.Process processo = new com.rapidminer.Process();

            System.out.println(unlabelledFile);

            Operator csvReader = OperatorService.createOperator(CSVDataReader.class);
            System.out.println(unlabelledFile);
            csvReader.setParameter(CSVDataReader.PARAMETER_CSV_FILE, unlabelledFile);
            csvReader.setParameter(CSVDataReader.PARAMETER_COLUMN_SEPARATORS, ",");
            csvReader.setParameter(CSVDataReader.PARAMETER_TRIM_LINES, "true");
            csvReader.setParameter(CSVDataReader.PARAMETER_USE_FIRST_ROW_AS_ATTRIBUTE_NAMES, "true");
            OutputPort portaSaidaLeitorCSV = csvReader.getOutputPorts().getPortByName("output");
            
            Operator ReadModelOperator = OperatorService.createOperator(ModelLoader.class);
            ReadModelOperator.setParameter("model_file", modelFile);
            OutputPort portaSaidaCarregadorModelo = ReadModelOperator.getOutputPorts().getPortByName("output");
            
            Operator modelApplier = OperatorService.createOperator(ModelApplier.class);
            modelApplier.setParameter("keep_model", "false");
            InputPort portaEntrada1AplicadorModelo = modelApplier.getInputPorts().getPortByName("model");
            InputPort portaEntrada2AplicadorModelo = modelApplier.getInputPorts().getPortByName("unlabelled data");

            ExampleSet resultSet = processo.run().get(ExampleSet.class);
            Iterator it = resultSet.iterator();
            while (it.hasNext()) {
                Example e = (Example) it.next();
                String predLabelIndex = e.getDataRow().toString();
                System.out.println(predLabelIndex);
            }

         
        } catch (OperatorException ex) {
            Logger.getLogger(ApplyModel.class.getName()).log(Level.SEVERE, null, ex);
        } catch (OperatorCreationException ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

}

Would someone please guide me why I am committing this error? Any help would be appreciated.

Regards,

Jarren

wannin0

I know the error is at
              Operator csvReader = OperatorService.createOperator(CSVDataReader.class);

I just don't know why? 

land

Hi,
because you are referring the wrong class. Use "com.rapidminer.operator.nio.CSVDataReader" instead.

Greetings,
  Sebastian

wannin0

Thanks!! Was able to successfully run it in Java :D