I have created a sales_order_save_after event observer. i will show the code below

SalesOrderSaveAfter.php

public function execute(\Magento\Framework\Event\Observer $  observer) {        //get the order object     $  order = $  observer->getEvent()->getOrder();     if ($  order instanceof \Magento\Framework\Model\AbstractModel)      {            //get status         $  new_status =   $  order->getStatus();         //check the new status is confirm or canceled          if ($  new_status == 'confirm' || $  new_status == 'canceled')          {                 //parameters = array()             $  params         =   array();             $  order_id       =   $  order->getId();             $  customer_id    =   $  order->getCustomerId();              if( !empty($  order_id) ) {                 $  product_ids = array();                 foreach( $  order->getAllVisibleItems() as $  item ) {                     $  product_ids[] =    $  item->getProductId();                     $  product       =    $  item->getData();                     //$  nrv         =    $  item->getProduct()->getAttributeText('nrv');                  }                     }               //$  nrv = Mage::getModel('catalog/product')->load($  product_ids)->getAttributeText('nrv');              $  params     =   array(                 'order_id'      =>  $  order_id,                 'customer_id'   =>  $  customer_id,                 'product_id'    =>  $  product_ids,                 'status'        =>  $  new_status,                 'product'       =>  $  product,                  //'nrv'         =>  $  nrv,             );          }          //call the curl         $  this->curlCall($  params);      }     return $  this; } 

Everything is working correctly. Am getting All the information except custom attribute. I added custom attribute nrv to each of the product. but i didn’t get value of custom attribute. How can I get the custom attribute value in observer?. Thanks in advance for your valuable answer.