package org.ec.downloader;

import org.ec.scheduler.Task;

import java.io.IOException;

/**
 * {@code SeleniumDownloader} is used for download the pages via AJAX rendering.
 *
 * @author dolphineor
 */
public class SeleniumDownloader implements Downloader {
    @Override
    public String download(Task task) throws IOException {
        return null;
    }
}

package org.ec.downloader;

import org.ec.scheduler.Task;

import java.io.IOException;

/**
 * {@code SeleniumDownloader} is used for downloading the pages via AJAX rendering.
 *
 * @author dolphineor
 */
public class SeleniumDownloader implements Downloader {
    @Override
    public String download(Task task) throws IOException {
        return null;
    }
}

Update SeleniumDownloader.java