Program: 83967
Project: 83967
Buggy source:
public void get(HttpExchange exchange,boolean internalCall,JSONObject internalResp){
  String links_to=database.getSymlinkAlias(URI);
  links_to=cleanPath(links_to);
  logger.info("String_Node_Str" + links_to);
  if (links_to.startsWith("String_Node_Str")) {
    logger.info("String_Node_Str" + exchangeJSON.toString());
    String requestPath=exchangeJSON.getString("String_Node_Str");
    String tail=null;
    if (requestPath.contains("String_Node_Str")) {
      tail=requestPath.substring(requestPath.indexOf("String_Node_Str"),requestPath.length());
      logger.info("String_Node_Str" + tail);
      requestPath=requestPath.replace(tail,"String_Node_Str");
    }
    requestPath=cleanPath(requestPath);
    String translation=requestPath.replace(URI,links_to);
    logger.info("String_Node_Str" + requestPath + "String_Node_Str"+ URI+ "String_Node_Str"+ links_to);
    logger.info("String_Node_Str" + translation);
    Resource r=null;
    if (!database.isSymlink(links_to))     r=RESTServer.getResource(translation);
 else     r=RESTServer.getResource(links_to);
    if (r != null) {
      r.exchangeJSON.accumulateAll(this.exchangeJSON);
      if (tail != null) {
        logger.fine("String_Node_Str" + translation + tail);
        r.exchangeJSON.put("String_Node_Str",translation + tail);
      }
 else {
        logger.fine("String_Node_Str" + translation);
        r.exchangeJSON.put("String_Node_Str",translation);
      }
      this.exchangeJSON.clear();
      r.get(exchange,false,internalResp);
      return;
    }
  }
  sendResponse(exchange,404,null,internalCall,internalResp);
}

Fixed version (ground truth):
public void get(HttpExchange exchange,boolean internalCall,JSONObject internalResp){
  String links_to=database.getSymlinkAlias(URI);
  links_to=cleanPath(links_to);
  logger.info("String_Node_Str" + links_to);
  if (links_to.startsWith("String_Node_Str")) {
    logger.info("String_Node_Str" + exchangeJSON.toString());
    String requestPath=exchangeJSON.getString("String_Node_Str");
    String tail=null;
    if (requestPath.contains("String_Node_Str")) {
      tail=requestPath.substring(requestPath.indexOf("String_Node_Str"),requestPath.length());
      logger.info("String_Node_Str" + tail);
      requestPath=requestPath.replace(tail,"String_Node_Str");
    }
    requestPath=cleanPath(requestPath);
    String translation=requestPath.replace(URI,links_to);
    logger.info("String_Node_Str" + requestPath + "String_Node_Str"+ URI+ "String_Node_Str"+ links_to);
    logger.info("String_Node_Str" + translation);
    Resource r=null;
    if (!database.isSymlink(links_to))     r=RESTServer.getResource(translation);
 else     r=RESTServer.getResource(links_to);
    if (r != null) {
      r.exchangeJSON.accumulateAll(this.exchangeJSON);
      if (tail != null) {
        logger.fine("String_Node_Str" + translation + tail);
        r.exchangeJSON.put("String_Node_Str",translation + tail);
      }
 else {
        logger.fine("String_Node_Str" + translation);
        r.exchangeJSON.put("String_Node_Str",translation);
      }
      this.exchangeJSON.clear();
      r.get(exchange,internalCall,internalResp);
      return;
    }
  }
  sendResponse(exchange,404,null,internalCall,internalResp);
}