I tried to test Librec by the code below but it show error \"Error: Could not fi

Question

I tried to test Librec by the code below but it show error "Error: Could not find or load main class"

Please any help to run the code. Thanks

import net.librec.BaseTestCase;

import net.librec.common.LibrecException;

import net.librec.conf.Configuration;

import net.librec.conf.Configuration.Resource;

import net.librec.data.DataModel;

import net.librec.data.model.TextDataModel;

import net.librec.eval.rating.RMSEEvaluator;

import net.librec.filter.GenericRecommendedFilter;

import net.librec.filter.RecommendedFilter;

import net.librec.job.RecommenderJob;

import net.librec.recommender.Recommender;

import net.librec.recommender.RecommenderContext;

import net.librec.recommender.cf.UserKNNRecommender;

import net.librec.recommender.item.RecommendedItem;

import net.librec.similarity.PCCSimilarity;

import net.librec.similarity.RecommenderSimilarity;

import net.librec.util.DriverClassUtil;

import java.awt.List;

import java.io.BufferedWriter;

import java.io.FileWriter;

import org.junit.Before;

import org.junit.FixMethodOrder;

import org.junit.Ignore;

import org.junit.Test;

import org.junit.runners.MethodSorters;

public class test1 {

   public void main(String[] args) throws Exception {

   System.out.print("lll");

       // recommender configuration

       Resource resource = new Resource("userknn-test.properties");

       Configuration conf = new Configuration();

       conf.addResource(resource);

       conf.set("dfs.data.dir","E:\Dropbox\Dinos-Fwtis\Thesis\Code\Recomendation\data");

       conf.set("dfs.input.path","filmtrust");

       conf.set("data.column.format","UIR");

       conf.set("data.convert.binarize.threshold","-1.0");

       // build data model

       TextDataModel dataModel = new TextDataModel(conf);

       dataModel.buildDataModel();

       System.out.print("OO");

       // set recommendation context

       RecommenderContext context = new RecommenderContext(conf,dataModel);

       RecommenderSimilarity similarity = new PCCSimilarity();

       similarity.buildSimilarityMatrix(dataModel);

       context.setSimilarity(similarity);

       // training

       Recommender recommender = new UserKNNRecommender();

       recommender.recommend(context);

       // evaluation

       RMSEEvaluator evaluator = new RMSEEvaluator();

       //MAEEvaluator evaluator = new MAEEvaluator();

       recommender.evaluate(evaluator);

       // recommendation results

       java.util.List recommendedItemList = recommender.getRecommendedList();

       //List recommendedItemList = recommender.getRecommendedList();

       RecommendedFilter filter = new GenericRecommendedFilter();

       recommendedItemList = filter.filter(recommendedItemList);

       System.out.println("len " + recommendedItemList.size());

       BufferedWriter writer = new BufferedWriter(new FileWriter("recommendations.txt"));

       for (RecommendedItem recommendedItem : recommendedItemList) {

           writer.write(

                   "user:" + recommendedItem.getUserId() + " " +

                   "item:" + recommendedItem.getItemId() + " " +

                   "value:" + recommendedItem.getValue() + " "

                   );

           writer.flush();

       }

       writer.close();

   }

}

Explanation / Answer

Here the big mistake done is main method should be preceded by the keywords in row like

"public static void".

In the code it is found that static key work is not mentioned. Please correct the code.

The syntax for main method should be as below.

public static void main(String[] args) throws Exception {

After doing this change code should execute without any error. If then also face any problem, please comment.

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