Program: 21461
Project: 21461
Buggy source:
/** 
 * Lädt eine LinkListe
 * @param file Die Datei, aus der die Links gelesen werden
 * @return Ein neuer Vector mit den DownloadLinks
 */
public Vector<DownloadLink> loadDownloadLinks(File file){
  try {
    if (file.exists()) {
      Object obj=JDUtilities.loadObject(null,file,Configuration.saveAsXML);
      if (obj != null && obj instanceof Vector) {
        Vector<DownloadLink> links=(Vector<DownloadLink>)obj;
        Iterator<DownloadLink> iterator=links.iterator();
        DownloadLink localLink;
        PluginForHost pluginForHost=null;
        while (iterator.hasNext()) {
          localLink=iterator.next();
          if (localLink.getStatus() == DownloadLink.STATUS_DONE && Configuration.FINISHED_DOWNLOADS_REMOVE_AT_START.equals(JDUtilities.getConfiguration().getProperty(Configuration.PARAM_FINISHED_DOWNLOADS_ACTION))) {
            iterator.remove();
            continue;
          }
          try {
            pluginForHost=JDUtilities.getPluginForHost(localLink.getHost()).getClass().newInstance();
          }
 catch (          InstantiationException e) {
            e.printStackTrace();
          }
catch (          IllegalAccessException e) {
            e.printStackTrace();
          }
          if (pluginForHost != null) {
            localLink.setLoadedPlugin(pluginForHost);
            pluginForHost.addPluginListener(this);
          }
 else {
            logger.severe("String_Node_Str" + localLink.getHost() + "String_Node_Str"+ localLink.getName());
          }
        }
        return links;
      }
    }
    return null;
  }
 catch (  Exception e) {
    logger.severe("String_Node_Str");
    return null;
  }
}

Fixed version (ground truth):
/** 
 * Lädt eine LinkListe
 * @param file Die Datei, aus der die Links gelesen werden
 * @return Ein neuer Vector mit den DownloadLinks
 */
private Vector<DownloadLink> loadDownloadLinks(File file){
  try {
    if (file.exists()) {
      Object obj=JDUtilities.loadObject(null,file,Configuration.saveAsXML);
      if (obj != null && obj instanceof Vector) {
        Vector<DownloadLink> links=(Vector<DownloadLink>)obj;
        Iterator<DownloadLink> iterator=links.iterator();
        DownloadLink localLink;
        PluginForHost pluginForHost=null;
        while (iterator.hasNext()) {
          localLink=iterator.next();
          if (localLink.getStatus() == DownloadLink.STATUS_DONE && Configuration.FINISHED_DOWNLOADS_REMOVE_AT_START.equals(JDUtilities.getConfiguration().getProperty(Configuration.PARAM_FINISHED_DOWNLOADS_ACTION))) {
            iterator.remove();
            continue;
          }
          try {
            pluginForHost=JDUtilities.getPluginForHost(localLink.getHost()).getClass().newInstance();
          }
 catch (          InstantiationException e) {
            e.printStackTrace();
          }
catch (          IllegalAccessException e) {
            e.printStackTrace();
          }
          if (pluginForHost != null) {
            localLink.setLoadedPlugin(pluginForHost);
            pluginForHost.addPluginListener(this);
          }
 else {
            logger.severe("String_Node_Str" + localLink.getHost() + "String_Node_Str"+ localLink.getName());
          }
        }
        return links;
      }
    }
    return null;
  }
 catch (  Exception e) {
    logger.severe("String_Node_Str");
    return null;
  }
}