Program: 20783
Project: 20783
Buggy source:
@Override public void handleFree(DownloadLink downloadLink) throws Exception, PluginException {
  requestFileInformation(downloadLink);
  int waitThis=20;
  if (!downloadLink.getDownloadURL().contains("String_Node_Str")) {
    waitThis=10;
    String wait=br.getRegex("String_Node_Str").getMatch(0);
    if (wait != null)     waitThis=Integer.parseInt(wait);
  }
  sleep(waitThis * 1001l,downloadLink);
  br.postPage(br.getURL(),"String_Node_Str");
  Random rndCookie=new Random();
  int rndX=rndCookie.nextInt(999999999 - 100000000) + 100000000;
  int rndY=rndCookie.nextInt(99999999 - 10000000) + 10000000;
  long ts=System.currentTimeMillis();
  br.setCookie(MAINPAGE,"String_Node_Str",rndY + "String_Node_Str" + rndX+ "String_Node_Str"+ ts+ "String_Node_Str"+ ts+ "String_Node_Str"+ ts+ "String_Node_Str");
  br.setCookie(MAINPAGE,"String_Node_Str",rndY + "String_Node_Str" + ts);
  br.setCookie(MAINPAGE,"String_Node_Str","String_Node_Str" + rndY + "String_Node_Str");
  br.setCookie(MAINPAGE,"String_Node_Str",rndY + "String_Node_Str" + ts+ "String_Node_Str");
  String dllink=br.getRegex("String_Node_Str").getMatch(0);
  if (dllink == null) {
    dllink=br.getRegex("String_Node_Str").getMatch(0);
    if ((dllink == null) && br.containsHTML("String_Node_Str")) {
      String[] dl_id=br.getRequest().getUrl().getPath().split("String_Node_Str");
      String appendLink="String_Node_Str";
      dllink="String_Node_Str" + dl_id[dl_id.length - 1] + "String_Node_Str";
      String referer=dllink.replace("String_Node_Str","String_Node_Str");
      br.setHeader("String_Node_Str",referer);
      br.setHeader("String_Node_Str","String_Node_Str");
      br.getPage(dllink + appendLink);
      String part1=br.getRegex("String_Node_Str").getMatch(0);
      String part2=br.getRegex("String_Node_Str").getMatch(0).replace("String_Node_Str","String_Node_Str");
      dllink="String_Node_Str" + part1 + "String_Node_Str"+ part2;
      if (part1 == null || part2 == null)       dllink=null;
    }
 else {
      String part1=br.getRegex("String_Node_Str").getMatch(0);
      String part2=br.getRegex("String_Node_Str").getMatch(0);
      String part3=br.getRegex("String_Node_Str").getMatch(0);
      if (part1 == null || part2 == null || part3 == null)       throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
      dllink="String_Node_Str" + part1 + "String_Node_Str"+ part2+ "String_Node_Str"+ part3;
      int secondWait=10;
      String secondWaitRegexed=br.getRegex("String_Node_Str").getMatch(0);
      if (secondWaitRegexed != null)       secondWait=Integer.parseInt(secondWaitRegexed);
      sleep(secondWait * 1001l,downloadLink);
    }
  }
  dl=BrowserAdapter.openDownload(br,downloadLink,dllink,true,-10);
  if (dl.getConnection().getContentType().contains("String_Node_Str")) {
    br.followConnection();
    if (br.getURL() != null && br.getURL().contains("String_Node_Str") || br.containsHTML("String_Node_Str"))     throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,"String_Node_Str");
    throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  }
  dl.startDownload();
}

Fixed version (ground truth):
@Override public void handleFree(DownloadLink downloadLink) throws Exception, PluginException {
  requestFileInformation(downloadLink);
  int waitThis=20;
  if (!downloadLink.getDownloadURL().contains("String_Node_Str")) {
    waitThis=10;
    String wait=br.getRegex("String_Node_Str").getMatch(0);
    if (wait != null)     waitThis=Integer.parseInt(wait);
  }
  sleep(waitThis * 1001l,downloadLink);
  br.postPage(br.getURL(),"String_Node_Str");
  Random rndCookie=new Random();
  int rndX=rndCookie.nextInt(999999999 - 100000000) + 100000000;
  int rndY=rndCookie.nextInt(99999999 - 10000000) + 10000000;
  long ts=System.currentTimeMillis();
  br.setCookie(MAINPAGE,"String_Node_Str",rndY + "String_Node_Str" + rndX+ "String_Node_Str"+ ts+ "String_Node_Str"+ ts+ "String_Node_Str"+ ts+ "String_Node_Str");
  br.setCookie(MAINPAGE,"String_Node_Str",rndY + "String_Node_Str" + ts);
  br.setCookie(MAINPAGE,"String_Node_Str","String_Node_Str" + rndY + "String_Node_Str");
  br.setCookie(MAINPAGE,"String_Node_Str",rndY + "String_Node_Str" + ts+ "String_Node_Str");
  String dllink=br.getRegex("String_Node_Str").getMatch(0);
  if (dllink == null) {
    dllink=br.getRegex("String_Node_Str").getMatch(0);
    if ((dllink == null) && br.containsHTML("String_Node_Str")) {
      String[] dl_id=br.getRequest().getUrl().getPath().split("String_Node_Str");
      String appendLink="String_Node_Str";
      dllink="String_Node_Str" + dl_id[dl_id.length - 1] + "String_Node_Str";
      br.getPage(dllink + appendLink);
      String part1=br.getRegex("String_Node_Str").getMatch(0);
      String part2=br.getRegex("String_Node_Str").getMatch(0).replace("String_Node_Str","String_Node_Str");
      dllink="String_Node_Str" + part1 + "String_Node_Str"+ part2;
      if (part1 == null || part2 == null)       dllink=null;
    }
 else {
      String part1=br.getRegex("String_Node_Str").getMatch(0);
      String part2=br.getRegex("String_Node_Str").getMatch(0);
      String part3=br.getRegex("String_Node_Str").getMatch(0);
      if (part1 == null || part2 == null || part3 == null)       throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
      dllink="String_Node_Str" + part1 + "String_Node_Str"+ part2+ "String_Node_Str"+ part3;
      int secondWait=10;
      String secondWaitRegexed=br.getRegex("String_Node_Str").getMatch(0);
      if (secondWaitRegexed != null)       secondWait=Integer.parseInt(secondWaitRegexed);
      sleep(secondWait * 1001l,downloadLink);
    }
  }
  dl=BrowserAdapter.openDownload(br,downloadLink,dllink,true,-10);
  if (dl.getConnection().getContentType().contains("String_Node_Str")) {
    br.followConnection();
    if (br.getURL() != null && br.getURL().contains("String_Node_Str") || br.containsHTML("String_Node_Str"))     throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,"String_Node_Str");
    throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  }
  dl.startDownload();
}