Program: 32015
Project: 32015
Buggy source:
/** 
 * Send the read receipt to a dedicated event.
 * @param anEvent       the event to acknowledge
 * @param aRespCallback asynchronous response callback
 * @return true if the read receipt request is sent, false otherwise
 */
public boolean sendReadReceipt(Event anEvent,final ApiCallback<Void> aRespCallback){
  final Event lastEvent=mStore.getLatestEvent(getRoomId());
  final Event fEvent;
  if (null != anEvent) {
    Log.d(LOG_TAG,"String_Node_Str" + getRoomId() + "String_Node_Str"+ anEvent.eventId);
    if (getDataHandler().getStore().isEventRead(getRoomId(),getDataHandler().getUserId(),anEvent.eventId)) {
      Log.d(LOG_TAG,"String_Node_Str");
      return false;
    }
 else {
      fEvent=anEvent;
    }
  }
 else {
    Log.d(LOG_TAG,"String_Node_Str" + getRoomId() + "String_Node_Str");
    fEvent=lastEvent;
  }
  if (null == fEvent) {
    Log.e(LOG_TAG,"String_Node_Str");
    return false;
  }
  boolean isSendReadReceiptSent=false;
  if (handleReceiptData(new ReceiptData(mMyUserId,fEvent.eventId,System.currentTimeMillis()))) {
    Log.d(LOG_TAG,"String_Node_Str");
    isSendReadReceiptSent=true;
    mDataHandler.getDataRetriever().getRoomsRestClient().sendReadReceipt(getRoomId(),fEvent.eventId,new ApiCallback<Void>(){
      @Override public void onSuccess(      Void info){
        Log.d(LOG_TAG,"String_Node_Str" + fEvent.eventId);
        if (null != aRespCallback) {
          aRespCallback.onSuccess(info);
        }
      }
      @Override public void onNetworkError(      Exception e){
        Log.e(LOG_TAG,"String_Node_Str" + fEvent.eventId + "String_Node_Str"+ e.getLocalizedMessage());
        if (null != aRespCallback) {
          aRespCallback.onNetworkError(e);
        }
      }
      @Override public void onMatrixError(      MatrixError e){
        Log.e(LOG_TAG,"String_Node_Str" + fEvent.eventId + "String_Node_Str"+ e.getLocalizedMessage());
        if (null != aRespCallback) {
          aRespCallback.onMatrixError(e);
        }
      }
      @Override public void onUnexpectedError(      Exception e){
        Log.e(LOG_TAG,"String_Node_Str" + fEvent.eventId + "String_Node_Str"+ e.getLocalizedMessage());
        if (null != aRespCallback) {
          aRespCallback.onUnexpectedError(e);
        }
      }
    }
);
    if (TextUtils.equals(lastEvent.eventId,fEvent.eventId)) {
      clearUnreadCounters(mStore.getSummary(getRoomId()));
    }
  }
 else {
    Log.d(LOG_TAG,"String_Node_Str");
  }
  return isSendReadReceiptSent;
}

Fixed version (ground truth):
/** 
 * Send the read receipt to a dedicated event.
 * @param anEvent       the event to acknowledge
 * @param aRespCallback asynchronous response callback
 * @return true if the read receipt request is sent, false otherwise
 */
public boolean sendReadReceipt(Event anEvent,final ApiCallback<Void> aRespCallback){
  final Event lastEvent=mStore.getLatestEvent(getRoomId());
  final Event fEvent;
  if (null == lastEvent) {
    Log.e(LOG_TAG,"String_Node_Str");
    return false;
  }
  if (null != anEvent) {
    Log.d(LOG_TAG,"String_Node_Str" + getRoomId() + "String_Node_Str"+ anEvent.eventId);
    if (getDataHandler().getStore().isEventRead(getRoomId(),getDataHandler().getUserId(),anEvent.eventId)) {
      Log.d(LOG_TAG,"String_Node_Str");
      return false;
    }
 else {
      fEvent=anEvent;
    }
  }
 else {
    Log.d(LOG_TAG,"String_Node_Str" + getRoomId() + "String_Node_Str");
    fEvent=lastEvent;
  }
  if (null == fEvent) {
    Log.e(LOG_TAG,"String_Node_Str");
    return false;
  }
  boolean isSendReadReceiptSent=false;
  if (handleReceiptData(new ReceiptData(mMyUserId,fEvent.eventId,System.currentTimeMillis()))) {
    Log.d(LOG_TAG,"String_Node_Str");
    isSendReadReceiptSent=true;
    mDataHandler.getDataRetriever().getRoomsRestClient().sendReadReceipt(getRoomId(),fEvent.eventId,new ApiCallback<Void>(){
      @Override public void onSuccess(      Void info){
        Log.d(LOG_TAG,"String_Node_Str" + fEvent.eventId);
        if (null != aRespCallback) {
          aRespCallback.onSuccess(info);
        }
      }
      @Override public void onNetworkError(      Exception e){
        Log.e(LOG_TAG,"String_Node_Str" + fEvent.eventId + "String_Node_Str"+ e.getLocalizedMessage());
        if (null != aRespCallback) {
          aRespCallback.onNetworkError(e);
        }
      }
      @Override public void onMatrixError(      MatrixError e){
        Log.e(LOG_TAG,"String_Node_Str" + fEvent.eventId + "String_Node_Str"+ e.getLocalizedMessage());
        if (null != aRespCallback) {
          aRespCallback.onMatrixError(e);
        }
      }
      @Override public void onUnexpectedError(      Exception e){
        Log.e(LOG_TAG,"String_Node_Str" + fEvent.eventId + "String_Node_Str"+ e.getLocalizedMessage());
        if (null != aRespCallback) {
          aRespCallback.onUnexpectedError(e);
        }
      }
    }
);
    if (TextUtils.equals(lastEvent.eventId,fEvent.eventId)) {
      clearUnreadCounters(mStore.getSummary(getRoomId()));
    }
  }
 else {
    Log.d(LOG_TAG,"String_Node_Str");
  }
  return isSendReadReceiptSent;
}