Program: 21455
Project: 21455
Buggy source:
private String getDownloadInfo(DownloadLink downloadLink){
  String serverAbb=serverMap.get((String)this.getProperties().getProperty("String_Node_Str"));
  String server2Abb=serverMap.get((String)this.getProperties().getProperty("String_Node_Str"));
  if (serverAbb == null) {
    serverAbb=serverList1[(int)(Math.random() * (serverList1.length - 1))];
  }
  if (server2Abb == null) {
    server2Abb=serverList2[(int)(Math.random() * (serverList2.length - 1))];
  }
  String endServerAbb="String_Node_Str";
  Boolean telekom=!(this.getProperties().getProperty("String_Node_Str") == null || !(Boolean)this.getProperties().getProperty("String_Node_Str"));
  String newURL=null;
  try {
    if (aborted) {
      logger.warning("String_Node_Str");
      downloadLink.setStatus(DownloadLink.STATUS_TODO);
      currentStep.setStatus(PluginStep.STATUS_TODO);
      return null;
    }
    requestInfo=getRequest(new URL(downloadLink.getUrlDownloadDecrypted()));
    if (requestInfo.getHtmlCode().indexOf(hardwareDefektString) > 0) {
      currentStep.setStatus(PluginStep.STATUS_ERROR);
      currentStep.setParameter(60 * 10);
      logger.severe("String_Node_Str");
      downloadLink.setStatus(DownloadLink.STATUS_ERROR_TEMPORARILY_UNAVAILABLE);
      return null;
    }
    if (requestInfo.containsHTML(toManyUser)) {
      currentStep.setStatus(PluginStep.STATUS_ERROR);
      currentStep.setParameter(60 * 2);
      logger.severe("String_Node_Str");
      downloadLink.setStatus(DownloadLink.STATUS_ERROR_TO_MANY_USERS);
      return null;
    }
    newURL=getFirstMatch(requestInfo.getHtmlCode(),patternForNewHost,1);
    if (newURL != null) {
      if (aborted) {
        logger.warning("String_Node_Str");
        downloadLink.setStatus(DownloadLink.STATUS_TODO);
        currentStep.setStatus(PluginStep.STATUS_TODO);
        return null;
      }
      requestInfo=postRequest(new URL(newURL),null,null,null,"String_Node_Str",true);
      captchaAddress=getFirstMatch(requestInfo.getHtmlCode(),patternForCaptcha,1);
      postTarget=getFirstMatch(requestInfo.getHtmlCode(),patternForFormData,1);
      actionString=getFirstMatch(requestInfo.getHtmlCode(),patternForFormData,2);
      if (telekom && requestInfo.containsHTML("String_Node_Str")) {
        actionString="String_Node_Str";
      }
 else       if (requestInfo.containsHTML(serverAbb + "String_Node_Str")) {
        actionString="String_Node_Str" + getServerFromAbbreviation(serverAbb);
      }
 else       if (requestInfo.containsHTML(server2Abb + "String_Node_Str")) {
        actionString="String_Node_Str" + getServerFromAbbreviation(server2Abb);
      }
 else {
        logger.severe("String_Node_Str");
        downloadLink.setStatus(DownloadLink.STATUS_ERROR_TEMPORARILY_UNAVAILABLE);
        currentStep.setStatus(PluginStep.STATUS_ERROR);
        return null;
      }
    }
  }
 catch (  MalformedURLException e) {
    e.printStackTrace();
  }
catch (  IOException e) {
    e.printStackTrace();
  }
  return newURL;
}

Fixed version (ground truth):
private String getDownloadInfo(DownloadLink downloadLink){
  String serverAbb=serverMap.get((String)this.getProperties().getProperty("String_Node_Str"));
  String server2Abb=serverMap.get((String)this.getProperties().getProperty("String_Node_Str"));
  if (serverAbb == null) {
    serverAbb=serverList1[(int)(Math.random() * (serverList1.length - 1))];
  }
  if (server2Abb == null) {
    server2Abb=serverList2[(int)(Math.random() * (serverList2.length - 1))];
  }
  String endServerAbb="String_Node_Str";
  Boolean telekom=!(this.getProperties().getProperty("String_Node_Str") == null || !(Boolean)this.getProperties().getProperty("String_Node_Str"));
  String newURL=null;
  try {
    if (aborted) {
      logger.warning("String_Node_Str");
      downloadLink.setStatus(DownloadLink.STATUS_TODO);
      currentStep.setStatus(PluginStep.STATUS_TODO);
      return null;
    }
    requestInfo=getRequest(new URL(downloadLink.getUrlDownloadDecrypted()));
    logger.info(requestInfo.getHtmlCode());
    if (requestInfo.getHtmlCode().indexOf(hardwareDefektString) > 0) {
      currentStep.setStatus(PluginStep.STATUS_ERROR);
      currentStep.setParameter(60 * 10);
      logger.severe("String_Node_Str");
      downloadLink.setStatus(DownloadLink.STATUS_ERROR_TEMPORARILY_UNAVAILABLE);
      return null;
    }
    if (requestInfo.containsHTML(toManyUser)) {
      currentStep.setStatus(PluginStep.STATUS_ERROR);
      currentStep.setParameter(60 * 2);
      logger.severe("String_Node_Str");
      downloadLink.setStatus(DownloadLink.STATUS_ERROR_TO_MANY_USERS);
      return null;
    }
    newURL=getFirstMatch(requestInfo.getHtmlCode(),patternForNewHost,1);
    if (newURL != null) {
      if (aborted) {
        logger.warning("String_Node_Str");
        downloadLink.setStatus(DownloadLink.STATUS_TODO);
        currentStep.setStatus(PluginStep.STATUS_TODO);
        return null;
      }
      requestInfo=postRequest(new URL(newURL),null,null,null,"String_Node_Str",true);
      captchaAddress=getFirstMatch(requestInfo.getHtmlCode(),patternForCaptcha,1);
      postTarget=getFirstMatch(requestInfo.getHtmlCode(),patternForFormData,1);
      actionString=getFirstMatch(requestInfo.getHtmlCode(),patternForFormData,2);
      if (telekom && requestInfo.containsHTML("String_Node_Str")) {
        actionString="String_Node_Str";
      }
 else       if (requestInfo.containsHTML(serverAbb + "String_Node_Str")) {
        actionString="String_Node_Str" + getServerFromAbbreviation(serverAbb);
      }
 else       if (requestInfo.containsHTML(server2Abb + "String_Node_Str")) {
        actionString="String_Node_Str" + getServerFromAbbreviation(server2Abb);
      }
 else {
        logger.severe("String_Node_Str");
        downloadLink.setStatus(DownloadLink.STATUS_ERROR_TEMPORARILY_UNAVAILABLE);
        currentStep.setStatus(PluginStep.STATUS_ERROR);
        return null;
      }
    }
  }
 catch (  MalformedURLException e) {
    e.printStackTrace();
  }
catch (  IOException e) {
    e.printStackTrace();
  }
  return newURL;
}