Program: 34388
Project: 34388
Buggy source:
/** 
 * Create all the necessary request handlers - this is called when manage request is called by the agent Do a bulk subscribe to improve the performance
 * @param dmClient
 * @throws MqttException
 */
public static void setRequestHandlers(ManagedClient dmClient) throws MqttException {
  String[] topics=new String[7];
  IMqttMessageListener[] listener=new IMqttMessageListener[7];
  int index=0;
  DeviceUpdateRequestHandler device=deviceUpdateHandlers.get(dmClient);
  if (device == null) {
    device=new DeviceUpdateRequestHandler(dmClient);
    topics[index]=device.getTopic();
    listener[index++]=device;
    deviceUpdateHandlers.put(dmClient,device);
  }
  ObserveRequestHandler observe=observeHandlers.get(dmClient);
  if (observe == null) {
    observe=new ObserveRequestHandler(dmClient);
    topics[index]=observe.getTopic();
    listener[index++]=observe;
    observeHandlers.put(dmClient,observe);
  }
  CancelRequestHandler cancel=cancelHandlers.get(dmClient);
  if (cancel == null) {
    cancel=new CancelRequestHandler(dmClient);
    topics[index]=cancel.getTopic();
    listener[index++]=cancel;
    cancelHandlers.put(dmClient,cancel);
  }
  RebootRequestHandler reboot=rebootHandlers.get(dmClient);
  if (reboot == null) {
    reboot=new RebootRequestHandler(dmClient);
    topics[index]=reboot.getTopic();
    listener[index++]=reboot;
    rebootHandlers.put(dmClient,reboot);
  }
  FactoryResetRequestHandler reset=resetHandlers.get(dmClient);
  if (reset == null) {
    reset=new FactoryResetRequestHandler(dmClient);
    topics[index]=reset.getTopic();
    listener[index++]=reset;
    resetHandlers.put(dmClient,reset);
  }
  FirmwareDownloadRequestHandler fwDownload=fwDownloadHandlers.get(dmClient);
  if (fwDownload == null) {
    fwDownload=new FirmwareDownloadRequestHandler(dmClient);
    topics[index]=fwDownload.getTopic();
    listener[index++]=fwDownload;
    fwDownloadHandlers.put(dmClient,fwDownload);
  }
  FirmwareUpdateRequestHandler fwUpdate=fwUpdateHandlers.get(dmClient);
  if (fwUpdate == null) {
    fwUpdate=new FirmwareUpdateRequestHandler(dmClient);
    topics[index]=fwUpdate.getTopic();
    listener[index++]=fwUpdate;
    fwUpdateHandlers.put(dmClient,fwUpdate);
  }
  if (index > 0) {
    int[] qos=new int[index];
    Arrays.fill(qos,1);
    dmClient.subscribe(topics,qos,listener);
  }
}

Fixed version (ground truth):
/** 
 * Create all the necessary request handlers - this is called when manage request is called by the agent Do a bulk subscribe to improve the performance
 * @param dmClient The managedDevice client instance
 * @throws MqttException when there is a failure in subscription
 */
public static void setRequestHandlers(ManagedClient dmClient) throws MqttException {
  String[] topics=new String[7];
  IMqttMessageListener[] listener=new IMqttMessageListener[7];
  int index=0;
  DeviceUpdateRequestHandler device=deviceUpdateHandlers.get(dmClient);
  if (device == null) {
    device=new DeviceUpdateRequestHandler(dmClient);
    topics[index]=device.getTopic();
    listener[index++]=device;
    deviceUpdateHandlers.put(dmClient,device);
  }
  ObserveRequestHandler observe=observeHandlers.get(dmClient);
  if (observe == null) {
    observe=new ObserveRequestHandler(dmClient);
    topics[index]=observe.getTopic();
    listener[index++]=observe;
    observeHandlers.put(dmClient,observe);
  }
  CancelRequestHandler cancel=cancelHandlers.get(dmClient);
  if (cancel == null) {
    cancel=new CancelRequestHandler(dmClient);
    topics[index]=cancel.getTopic();
    listener[index++]=cancel;
    cancelHandlers.put(dmClient,cancel);
  }
  RebootRequestHandler reboot=rebootHandlers.get(dmClient);
  if (reboot == null) {
    reboot=new RebootRequestHandler(dmClient);
    topics[index]=reboot.getTopic();
    listener[index++]=reboot;
    rebootHandlers.put(dmClient,reboot);
  }
  FactoryResetRequestHandler reset=resetHandlers.get(dmClient);
  if (reset == null) {
    reset=new FactoryResetRequestHandler(dmClient);
    topics[index]=reset.getTopic();
    listener[index++]=reset;
    resetHandlers.put(dmClient,reset);
  }
  FirmwareDownloadRequestHandler fwDownload=fwDownloadHandlers.get(dmClient);
  if (fwDownload == null) {
    fwDownload=new FirmwareDownloadRequestHandler(dmClient);
    topics[index]=fwDownload.getTopic();
    listener[index++]=fwDownload;
    fwDownloadHandlers.put(dmClient,fwDownload);
  }
  FirmwareUpdateRequestHandler fwUpdate=fwUpdateHandlers.get(dmClient);
  if (fwUpdate == null) {
    fwUpdate=new FirmwareUpdateRequestHandler(dmClient);
    topics[index]=fwUpdate.getTopic();
    listener[index++]=fwUpdate;
    fwUpdateHandlers.put(dmClient,fwUpdate);
  }
  if (index > 0) {
    int[] qos=new int[index];
    Arrays.fill(qos,1);
    dmClient.subscribe(topics,qos,listener);
  }
}