Magento 2 – Set Custom Attribute Value on Cart Page

In Magento 1.x

I have created following function in Namespace/Modulename/Model/Observer.php

public function salesQuoteItemSetCustomAttribute($observer){

        $quoteItem = $observer->getQuoteItem();
        $product = $observer->getProduct();
        $quoteItem->setCustomerProductPoints($product->getCustomerProductPoints());
    }

Called this function in Namespace/Modulename/etc/config.xml

    <sales_quote_item_set_product>
                <observers>
                    <product_point_quote>
                        <class>productpoint/observer</class>
                        <method>salesQuoteItemSetCustomAttribute</method>
                    </product_point_quote>
                </observers>
    </sales_quote_item_set_product>

Also Have converted my custom attribute quote to order and from order to quote by using following code in config.xml

    <sales_convert_quote_item>
        <customer_product_points>
            <to_order_item>*</to_order_item>
            <to_invoice_item>*</to_invoice_item>
            <to_shipment_item>*</to_shipment_item>
            <to_cm_item>*</to_cm_item>
        </customer_product_points>
    </sales_convert_quote_item>
    <sales_convert_order_item>
        <customer_product_points>
            <to_quote_item>*</to_quote_item>
            <to_invoice_item>*</to_invoice_item>
            <to_shipment_item>*</to_shipment_item>
            <to_cm_item>*</to_cm_item>
        </customer_product_points>
    </sales_convert_order_item>

In Magento 2

I tried doing the same thing in Magento 2 but not able to get details of product.

I tried with following code:

Namespace/Modulename/Observer/salesQuoteItemSetCustomAttribute.php

<?php
namespace Namespace\Modulename\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Catalog\Model\Product;
use Magento\Checkout\Model\Cart;


class salesQuoteItemSetCustomAttribute implements ObserverInterface
{
    public function __construct(
        \Magento\Checkout\Model\Cart $cart,
        \Magento\Catalog\Model\Product $product
    ) {
        $this->cart = $cart;
        $this->product = $product;
    }
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $cartQuote= $this->cart->getItems()->getData();
        $prod= $this->product->getData();
        echo '<pre>';print_r($prod); exit;
    }
}

etc/events.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="sales_quote_save_after">
        <observer name="set_checkout_quote_id" instance="Magento\Checkout\Observer\SalesQuoteSaveAfterObserver" />
    </event>
</config>

etc/fieldset.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="../../../../../../../../../../lib/internal/Magento/Framework/Object/etc/fieldset.xsd">
    <scope id="global">
        <fieldset id="sales_convert_quote_item">
            <field name="product_point">
                <aspect name="to_order_item" />
                <aspect name="to_invoice_item" />
                <aspect name="to_shipment_item" />
                <aspect name="to_cm_item" />
            </field>
        </fieldset>
        <fieldset id="sales_convert_order_item">
            <field name="product_point">
                <aspect name="to_quote_item" />
                <aspect name="to_invoice_item" />
                <aspect name="to_shipment_item" />
                <aspect name="to_cm_item" />
            </field>
        </fieldset>
    </scope>
</config>

Using the above code I am getting values of attributes in cart but not getting my custom attribute value. When I try to print Product Data it returns null.

The code works well with Magento 1.9. How do I make it work with Magento 2.0.2?

How to set custom attribute and display it cart page in Magento 2?