Program: 21499
Project: 21499
Buggy source:
@Override public boolean doInteraction(Object arg){
  Configuration configuration=JDUtilities.getConfiguration();
  retries++;
  logger.info("String_Node_Str" + retries);
  String ipBefore;
  String ipAfter;
  RouterData routerData=configuration.getRouterData();
  if (routerData == null) {
    this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
    return false;
  }
  String routerIP=routerData.getRouterIP();
  String routerUsername=configuration.getRouterUsername();
  String routerPassword=configuration.getRouterPassword();
  int routerPort=routerData.getRouterPort();
  String login=routerData.getLogin();
  String disconnect=routerData.getDisconnect();
  String connect=routerData.getConnect();
  int waitTime=configuration.getWaitForIPCheck();
  if (routerUsername != null && routerPassword != null)   Authenticator.setDefault(new InternalAuthenticator(routerUsername,routerPassword));
  String routerPage;
  if (routerPort <= 0)   routerPage="String_Node_Str" + routerIP + "String_Node_Str";
 else   routerPage="String_Node_Str" + routerIP + "String_Node_Str"+ routerPort+ "String_Node_Str";
  RequestInfo requestInfo=null;
  ipBefore=getIPAddress(routerPage,routerData);
  logger.fine("String_Node_Str" + ipBefore);
  if (login != null && !login.equals("String_Node_Str")) {
    login.replaceAll(VAR_USERNAME,routerUsername);
    login.replaceAll(VAR_PASSWORD,routerPassword);
    requestInfo=doThis("String_Node_Str",isAbsolute(login) ? login : routerPage + login,requestInfo,routerData.getLoginRequestProperties(),routerData.getLoginPostParams(),routerData.getLoginType());
    if (requestInfo == null) {
      logger.severe("String_Node_Str");
      this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
      return false;
    }
 else     if (!requestInfo.isOK()) {
      logger.severe("String_Node_Str" + requestInfo.getResponseCode());
      this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
      return false;
    }
  }
  requestInfo=doThis("String_Node_Str",isAbsolute(disconnect) ? disconnect : routerPage + disconnect,requestInfo,routerData.getDisconnectRequestProperties(),routerData.getDisconnectPostParams(),routerData.getDisconnectType());
  if (requestInfo == null) {
    logger.severe("String_Node_Str");
    this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
    return false;
  }
 else   if (!requestInfo.isOK()) {
    logger.severe("String_Node_Str" + requestInfo.getResponseCode());
    this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
    return false;
  }
  try {
    Thread.sleep(500);
  }
 catch (  InterruptedException e) {
  }
  logger.fine("String_Node_Str");
  requestInfo=doThis("String_Node_Str",isAbsolute(connect) ? connect : routerPage + connect,null,routerData.getConnectRequestProperties(),routerData.getConnectPostParams(),routerData.getConnectType());
  if (requestInfo == null) {
    logger.severe("String_Node_Str");
    this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
    return false;
  }
 else   if (!requestInfo.isOK()) {
    logger.severe("String_Node_Str" + requestInfo.getResponseCode());
    this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
    return false;
  }
  if (waitTime > 0) {
    logger.fine("String_Node_Str" + waitTime + "String_Node_Str");
    try {
      Thread.sleep(waitTime * 1000);
    }
 catch (    InterruptedException e) {
    }
  }
  ipAfter=getIPAddress(routerPage,routerData);
  logger.fine("String_Node_Str" + ipAfter);
  if (ipBefore == null || ipAfter == null || ipBefore.equals(ipAfter)) {
    logger.severe("String_Node_Str");
    if (retries < configuration.getReconnectRetries() || configuration.getReconnectRetries() <= 0) {
      return interact(arg);
    }
    this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
    retries=0;
    return false;
  }
  this.setCallCode(Interaction.INTERACTION_CALL_SUCCESS);
  retries=0;
  return true;
}

Fixed version (ground truth):
@Override public boolean doInteraction(Object arg){
  Configuration configuration=JDUtilities.getConfiguration();
  retries++;
  logger.info("String_Node_Str" + retries);
  String ipBefore;
  String ipAfter;
  RouterData routerData=configuration.getRouterData();
  if (routerData == null) {
    this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
    return false;
  }
  String routerIP=routerData.getRouterIP();
  String routerUsername=configuration.getRouterUsername();
  String routerPassword=configuration.getRouterPassword();
  int routerPort=routerData.getRouterPort();
  String login=routerData.getLogin();
  String disconnect=routerData.getDisconnect();
  String connect=routerData.getConnect();
  int waitTime=configuration.getWaitForIPCheck();
  if (routerUsername != null && routerPassword != null)   Authenticator.setDefault(new InternalAuthenticator(routerUsername,routerPassword));
  String routerPage;
  if (routerPort <= 0)   routerPage="String_Node_Str" + routerIP + "String_Node_Str";
 else   routerPage="String_Node_Str" + routerIP + "String_Node_Str"+ routerPort+ "String_Node_Str";
  RequestInfo requestInfo=null;
  ipBefore=getIPAddress(routerPage,routerData);
  logger.fine("String_Node_Str" + ipBefore);
  if (login != null && !login.equals("String_Node_Str")) {
    login.replaceAll(VAR_USERNAME,routerUsername);
    login.replaceAll(VAR_PASSWORD,routerPassword);
    requestInfo=doThis("String_Node_Str",isAbsolute(login) ? login : routerPage + login,requestInfo,routerData.getLoginRequestProperties(),routerData.getLoginPostParams(),routerData.getLoginType());
    if (requestInfo == null) {
      logger.severe("String_Node_Str");
      this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
      return false;
    }
 else     if (!requestInfo.isOK()) {
      logger.severe("String_Node_Str" + requestInfo.getResponseCode());
      this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
      return false;
    }
  }
  requestInfo=doThis("String_Node_Str",isAbsolute(disconnect) ? disconnect : routerPage + disconnect,requestInfo,routerData.getDisconnectRequestProperties(),routerData.getDisconnectPostParams(),routerData.getDisconnectType());
  if (requestInfo == null) {
    logger.severe("String_Node_Str");
    this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
    return false;
  }
 else   if (!requestInfo.isOK()) {
    logger.severe("String_Node_Str" + requestInfo.getResponseCode());
    this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
    return false;
  }
  try {
    Thread.sleep(500);
  }
 catch (  InterruptedException e) {
  }
  logger.fine("String_Node_Str");
  requestInfo=doThis("String_Node_Str",isAbsolute(connect) ? connect : routerPage + connect,null,routerData.getConnectRequestProperties(),routerData.getConnectPostParams(),routerData.getConnectType());
  if (requestInfo == null) {
    logger.severe("String_Node_Str");
    this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
    return false;
  }
 else   if (!requestInfo.isOK()) {
    logger.severe("String_Node_Str" + requestInfo.getResponseCode());
    this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
    return false;
  }
  if (waitTime > 0) {
    logger.fine("String_Node_Str" + waitTime + "String_Node_Str");
    try {
      Thread.sleep(waitTime * 1000);
    }
 catch (    InterruptedException e) {
    }
  }
  ipAfter=getIPAddress(routerPage,routerData);
  logger.fine("String_Node_Str" + ipAfter);
  if (ipBefore == null || ipAfter == null || ipBefore.equals(ipAfter)) {
    logger.severe("String_Node_Str");
    if (retries < HTTPReconnect.MAX_RETRIES && (retries < configuration.getReconnectRetries() || configuration.getReconnectRetries() <= 0)) {
      return doInteraction(arg);
    }
    this.setCallCode(Interaction.INTERACTION_CALL_ERROR);
    retries=0;
    return false;
  }
  this.setCallCode(Interaction.INTERACTION_CALL_SUCCESS);
  retries=0;
  return true;
}