Question

I’m using a rdf crawler, in that I had a class named as:

import edu.unika.aifb.rdf.crawler.*;
import com.hp.hpl.jena.rdf.model.*;
import com.hp.hpl.jena.util.FileManager;

These are class file termed as error, and I try with jena packages but I had attached, it does not make any changes.

Update:

Full SampleCrawl.java class content:

import java.util.*;
import edu.unika.aifb.rdf.crawler.*;

/**
 * Call this class with 3 arguments - URL to crawl to,
 * depth and time in seconds
 */

public class SampleCrawl {

    /**
     * @param uRI
     * @param depth
     * @param time
     */
    @SuppressWarnings("rawtypes")
    public SampleCrawl(Vector uRI, Vector hf, int depth, int time){

        // Initialize Crawling parameters
        CrawlConsole c = new CrawlConsole(uRI,hf,depth,time);

        // get an ontology file from its local location
        // (OPTIONAL)
        c.setLocalNamespace("http://www.daml.org/2000/10/daml-ont","c:\\temp\\rdf\\schemas\\daml-ont.rdf");

        // set all the paths to get all the results
        c.setLogPath("c:\\temp\\crawllog.xml");
        c.setCachePath("c:\\temp\\crawlcache.txt");
        c.setModelPath("c:\\temp\\crawlmodel.rdf");

        try{
            // crawl and get RDF model
            c.start();

            // This writes all three result files out
            c.writeResults();
        }catch(Exception e){
        }
    }

    /**
     * @param args
     * @throws Exception
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public static void main(String[] args) throws Exception {

        if (args.length != 3) {
            System.err.println("Usage: java  -cp  [JARs]  SampleCrawl  [URL]  [depth:int]  [time:int]");
            System.exit(0);
        }

        Vector uris = new Vector();
        uris.add(args[0]);

        // no host filtering - crawl to all hosts
        Vector hostfilter = null;

        /* You may want to do something else to enable host filtering:
         * Vector hostfilter = new Vector();
         * hostfilter.add("http://www.w3.org");
         */

        int depth = 2;
        int time = 60;
        try {
            depth = Integer.parseInt(args[1]);
            time = Integer.parseInt(args[2]);
        }
        catch (Exception e) {
            System.err.println("Illegal argument types:");
            System.err.println("Argument list: URI:String  depth:int  time(s):int");
            System.exit(0);
        }
        new SampleCrawl(uris,hostfilter,depth,time);
    }
}

Question:
How to add import edu.unika.aifb.rdf.crawler.; error occurs here

Answer 1

I googled the package that you’re trying to import, and it appears that you’re using Kaon. Assuming that’s so, you have made an error in your import declaration. You have:

import edu.unika.aifb.rdf.crawler.*;

whereas the download available on SourceForge would require:

import edu.unika.aifb.rdf.rdfcrawler.*;

As an aside, it would be helpful if you would include information, such as “I’m trying to use Kaon’s rdfcrawler from …” in your question. Otherwise, we have to try to guess important details in your setup.