Program: 83960
Project: 83960
Buggy source:
public void delete(HttpExchange exchange,boolean internalCall,JSONObject internalResp){
  try {
    logger.info("String_Node_Str" + URI);
    String tailResources=null;
    if (uri_link != null) {
      tailResources=getTailResourceUri(exchange,true);
      if (tailResources.equals("String_Node_Str")) {
        database.removeSymlinkEntry(URI);
        database.removeRestResource(URI);
        RESTServer.removeResource(this);
        this.metadataGraph.removeNode(this.URI);
        sendResponse(exchange,202,null,internalCall,internalResp);
        return;
      }
      String linksToStr=uri_link;
      if (database.isSymlink(linksToStr)) {
        linksToStr=database.getSymlinkAlias(uri_link);
        while (linksToStr != null && database.isSymlink(linksToStr)) {
          linksToStr=database.getSymlinkAlias(linksToStr);
        }
      }
      if (linksToStr.startsWith("String_Node_Str")) {
        String thisUri=uri_link + tailResources;
        Resource resource=RESTServer.getResource(thisUri);
        if (resource != null) {
          resource.exchangeJSON.putAll(this.exchangeJSON);
          resource.delete(exchange,internalCall,internalResp);
        }
 else {
          sendResponse(exchange,404,null,internalCall,internalResp);
          return;
        }
      }
 else {
        String thisUrl=linksToStr + tailResources;
        StringBuffer serverRespBuffer=new StringBuffer();
        HttpURLConnection is4Conn=is4ServerDelete(thisUrl,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);
        }
      }
    }
 else     if (url_link != null) {
      tailResources=getTailResourceUri(exchange,false);
      if (tailResources.equals("String_Node_Str")) {
        database.removeSymlinkEntry(URI);
        database.removeRestResource(URI);
        RESTServer.removeResource(this);
        this.metadataGraph.removeNode(this.URI);
        sendResponse(exchange,202,null,internalCall,internalResp);
        return;
      }
      String thisUrl=url_link.toString() + tailResources;
      StringBuffer serverRespBuffer=new StringBuffer();
      HttpURLConnection is4Conn=is4ServerDelete(thisUrl,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 delete(HttpExchange exchange,boolean internalCall,JSONObject internalResp){
  try {
    logger.info("String_Node_Str" + URI);
    String tailResources=null;
    if (uri_link != null) {
      tailResources=getTailResourceUri(exchange,true);
      if (tailResources.equals("String_Node_Str")) {
        database.removeSymlinkEntry(URI);
        database.removeRestResource(URI);
        RESTServer.removeResource(this);
        this.metadataGraph.removeNode(this.URI);
        sendResponse(exchange,202,null,internalCall,internalResp);
        return;
      }
      String linksToStr=uri_link;
      if (database.isSymlink(linksToStr)) {
        linksToStr=database.getSymlinkAlias(uri_link);
        while (linksToStr != null && database.isSymlink(linksToStr)) {
          linksToStr=database.getSymlinkAlias(linksToStr);
        }
      }
      if (linksToStr.startsWith("String_Node_Str")) {
        String thisUri=uri_link + tailResources;
        Resource resource=RESTServer.getResource(thisUri);
        if (resource != null) {
          resource.exchangeJSON.putAll(this.exchangeJSON);
          resource.delete(exchange,internalCall,internalResp);
        }
 else {
          sendResponse(exchange,404,null,internalCall,internalResp);
          return;
        }
      }
 else {
        String thisUrl=linksToStr + tailResources;
        StringBuffer serverRespBuffer=new StringBuffer();
        HttpURLConnection is4Conn=is4ServerDelete(thisUrl,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);
        }
      }
    }
 else     if (url_link != null) {
      tailResources=getTailResourceUri(exchange,false);
      if (tailResources.equals("String_Node_Str")) {
        database.removeSymlinkEntry(URI);
        database.removeRestResource(URI);
        RESTServer.removeResource(this);
        this.metadataGraph.removeNode(this.URI);
        sendResponse(exchange,202,null,internalCall,internalResp);
        return;
      }
      String thisUrl=url_link.toString() + tailResources;
      StringBuffer serverRespBuffer=new StringBuffer();
      HttpURLConnection is4Conn=is4ServerDelete(thisUrl,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);
  }
}