How do I get scratches using crawler4j?

I'm going on this for 4 hours and I just can't see what I am doing wrong. I have two files:

• MyCrawler.java
• Controller.java

MyCrawler.java

import edu.uci.ics.crawler4j.crawler.Page;
import edu.uci.ics.crawler4j.crawler.WebCrawler;
import edu.uci.ics.crawler4j.parser.HtmlParseData;
import edu.uci.ics.crawler4j.url.WebURL;
import java.util.List;
import java.util.regex.Pattern;
import org.apache.http.Header;

public class MyCrawler extends WebCrawler {

    private final static Pattern FILTERS = Pattern.compile(".*(\\.(css|js|bmp|gif|jpe?g" + "|png|tiff?|mid|mp2|mp3|mp4"
                    + "|wav|avi|mov|mpeg|ram|m4v|pdf" + "|rm|smil|wmv|swf|wma|zip|rar|gz))$");

    /**
     * You should implement this function to specify whether the given url
     * should be crawled or not (based on your crawling logic).
     */
    @Override
    public boolean shouldVisit(WebURL url) {
            String href = url.getURL().toLowerCase();
            return !FILTERS.matcher(href).matches() && href.startsWith("http://www.ics.uci.edu/");
    }

    /**
     * This function is called when a page is fetched and ready to be processed
     * by your program.
     */
    @Override
    public void visit(Page page) {
            int docid = page.getWebURL().getDocid();
            String url = page.getWebURL().getURL();
            String domain = page.getWebURL().getDomain();
            String path = page.getWebURL().getPath();
            String subDomain = page.getWebURL().getSubDomain();
            String parentUrl = page.getWebURL().getParentUrl();
            String anchor = page.getWebURL().getAnchor();

            System.out.println("Docid: " + docid);
            System.out.println("URL: " + url);
            System.out.println("Domain: '" + domain + "'");
            System.out.println("Sub-domain: '" + subDomain + "'");
            System.out.println("Path: '" + path + "'");
            System.out.println("Parent page: " + parentUrl);
            System.out.println("Anchor text: " + anchor);

            if (page.getParseData() instanceof HtmlParseData) {
                    HtmlParseData htmlParseData = (HtmlParseData) page.getParseData();
                    String text = htmlParseData.getText();
                    String html = htmlParseData.getHtml();
                    List<WebURL> links = htmlParseData.getOutgoingUrls();

                    System.out.println("Text length: " + text.length());
                    System.out.println("Html length: " + html.length());
                    System.out.println("Number of outgoing links: " + links.size());
            }

            Header[] responseHeaders = page.getFetchResponseHeaders();
            if (responseHeaders != null) {
                    System.out.println("Response headers:");
                    for (Header header : responseHeaders) {
                            System.out.println("\t" + header.getName() + ": " + header.getValue());
                    }
            }

            System.out.println("=============");
    }
}

      

        
        
        
      

    

Controller.java

package edu.crawler;

import edu.uci.ics.crawler4j.crawler.Page;
import edu.uci.ics.crawler4j.crawler.WebCrawler;
import edu.uci.ics.crawler4j.parser.HtmlParseData;
import edu.uci.ics.crawler4j.url.WebURL;
import java.util.List;
import java.util.regex.Pattern;

import org.apache.http.Header;

import edu.uci.ics.crawler4j.crawler.CrawlConfig;
import edu.uci.ics.crawler4j.crawler.CrawlController;
import edu.uci.ics.crawler4j.fetcher.PageFetcher;
import edu.uci.ics.crawler4j.robotstxt.RobotstxtConfig;
import edu.uci.ics.crawler4j.robotstxt.RobotstxtServer;

public class Controller 
{

    public static void main(String[] args) throws Exception 
    {
            String crawlStorageFolder = "../data/";
            int numberOfCrawlers = 7;

            CrawlConfig config = new CrawlConfig();
            config.setCrawlStorageFolder(crawlStorageFolder);

            /*
             * Instantiate the controller for this crawl.
             */
            PageFetcher pageFetcher = new PageFetcher(config);
            RobotstxtConfig robotstxtConfig = new RobotstxtConfig();
            RobotstxtServer robotstxtServer = new RobotstxtServer(robotstxtConfig, pageFetcher);
            CrawlController controller = new CrawlController(config, pageFetcher, robotstxtServer);

            /*
             * For each crawl, you need to add some seed urls. These are the first
             * URLs that are fetched and then the crawler starts following links
             * which are found in these pages
             */
            controller.addSeed("http://www.ics.uci.edu/~welling/");
            controller.addSeed("http://www.ics.uci.edu/~lopes/");
            controller.addSeed("http://www.ics.uci.edu/");

            /*
             * Start the crawl. This is a blocking operation, meaning that your code
             * will reach the line after this only when crawling is finished.
             */
            controller.start(MyCrawler, numberOfCrawlers);
    }
}

      

        
        
        
      

    

The structure looks like this:

java/MyCrawler.java
java/Controller.java
jars/... --> all the jars crawler4j

      

        
        
        
      

    

I am trying to compile this on a WINDOWS machine using:

javac -cp "C:\xampp\htdocs\crawlcrowd\www\java\jars\*;C:\xampp\htdocs\crawlcrowd\www\java\*" MyCrawler.java

      

        
        
        
      

    

This works great and I get:

java/MyCrawler.class

      

        
        
        
      

    

However, when I type:

javac -cp "C:\xampp\htdocs\crawlcrowd\www\java\jars\*;C:\xampp\htdocs\crawlcrowd\www\java\*" Controller.java

      

        
        
        
      

    

it bombs with:

Controller.java:50: error: cannot find symbol
            controller.start(MyCrawler, numberOfCrawlers);
                             ^
  symbol:   variable MyCrawler
  location: class Controller
1 error

      

        
        
        
      

    

So, I think somehow I am not doing what I need to do. Something that makes this new executable class "aware" of MyCrawler.class. I tried messing around with the classpath in the javac part of the command line. I also tried to set it in environment variables ... no luck.

Any idea how I can get this to work?

UPDATE

I got most of this code from the Google Code page. But I just can't figure out what should go there. Even if I try this:

MyCrawler mc = new MyCrawler();

      

        
        
        
      

    

Bad luck. Somehow Controller.class doesn't know about MyCrawler.class.

UPDATE 2

I don't think this is important because the problem is that it cannot find the class, but anyway, here is the signature "CrawlController controller". Taken from here .

   /**
     * Start the crawling session and wait for it to finish.
     * 
     * @param _c
     *            the class that implements the logic for crawler threads
     * @param numberOfCrawlers
     *            the number of concurrent threads that will be contributing in
     *            this crawling session.
     */
    public <T extends WebCrawler> void start(final Class<T> _c, final int numberOfCrawlers) {
            this.start(_c, numberOfCrawlers, true);
    }

      

        
        
        
      

    

I actually go through the "crawler" when I go to "MyCrawler". The problem is that the application doesn't know what MyCrawler is.