Program: 83962
Project: 83962
Buggy source:
public void post(HttpExchange exchange,String data,boolean internalCall,JSONObject internalResp){
  try {
    String tailResources=null;
    if (uri_link != null) {
      tailResources=getTailResourceUri(exchange,true);
      String thisUri=uri_link + tailResources;
      Resource resource=RESTServer.getResource(thisUri);
      resource.exchangeJSON.putAll(this.exchangeJSON);
      resource.post(exchange,data,internalCall,internalResp);
    }
 else     if (url_link != null) {
      tailResources=getTailResourceUri(exchange,false);
      String thisUrl=url_link.toString() + tailResources;
      StringBuffer serverRespBuffer=new StringBuffer();
      HttpURLConnection is4Conn=is4ServerPost(thisUrl,data,serverRespBuffer);
      if (is4Conn != null) {
        String requestUri=exchange.getRequestURI().toString();
        if (requestUri.contains("String_Node_Str"))         requestUri=requestUri.substring(0,requestUri.indexOf("String_Node_Str"));
        if (requestUri.contains("String_Node_Str") && !requestUri.endsWith("String_Node_Str")) {
          JSONObject fixedServerResp=new JSONObject();
          String localUri=URI + tailResources;
          fixedServerResp.put(localUri,serverRespBuffer.toString());
          sendResponse(exchange,is4Conn.getResponseCode(),fixedServerResp.toString(),internalCall,internalResp);
        }
 else {
          sendResponse(exchange,is4Conn.getResponseCode(),serverRespBuffer.toString(),internalCall,internalResp);
        }
        is4Conn.disconnect();
      }
 else {
        sendResponse(exchange,504,null,internalCall,internalResp);
      }
    }
  }
 catch (  Exception e) {
    logger.log(Level.WARNING,"String_Node_Str",e);
    sendResponse(exchange,504,null,internalCall,internalResp);
  }
}

Fixed version (ground truth):
public void post(HttpExchange exchange,String data,boolean internalCall,JSONObject internalResp){
  try {
    String tailResources=null;
    if (uri_link != null) {
      tailResources=getTailResourceUri(exchange,true);
      String thisUri=uri_link + tailResources;
      Resource resource=RESTServer.getResource(thisUri);
      resource.exchangeJSON.putAll(this.exchangeJSON);
      resource.post(exchange,data,internalCall,internalResp);
    }
 else     if (url_link != null) {
      tailResources=getTailResourceUri(exchange,false);
      String thisUrl=url_link.toString() + tailResources;
      StringBuffer serverRespBuffer=new StringBuffer();
      HttpURLConnection is4Conn=is4ServerPost(thisUrl,data,serverRespBuffer);
      if (is4Conn != null) {
        String requestUri=exchangeJSON.getString("String_Node_Str");
        if (requestUri.contains("String_Node_Str"))         requestUri=requestUri.substring(0,requestUri.indexOf("String_Node_Str"));
        if (requestUri.contains("String_Node_Str") && !requestUri.endsWith("String_Node_Str")) {
          JSONObject fixedServerResp=new JSONObject();
          String localUri=URI + tailResources;
          fixedServerResp.put(localUri,serverRespBuffer.toString());
          sendResponse(exchange,is4Conn.getResponseCode(),fixedServerResp.toString(),internalCall,internalResp);
        }
 else {
          sendResponse(exchange,is4Conn.getResponseCode(),serverRespBuffer.toString(),internalCall,internalResp);
        }
        is4Conn.disconnect();
      }
 else {
        sendResponse(exchange,504,null,internalCall,internalResp);
      }
    }
  }
 catch (  Exception e) {
    logger.log(Level.WARNING,"String_Node_Str",e);
    sendResponse(exchange,504,null,internalCall,internalResp);
  }
}