Magento 2 extension - How to retrieve customer's data after registration

Question

I need to retrieve id and email from the new customer after registration success. I imagine I have to bind the "customer_register_success" event, but my attempt is not working:

etc/frontend/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="customer_register_success">
        <observer name="customer_register_success_observer" instance="<Mynamespace>\<Mymodule>\Model\Observer\CustomerRegister" />
    </event>
</config>

Model/Observer/CustomerRegister.php

<?php

namespace Vendor\Module\Observer;
use Magento\Framework\Event\ObserverInterface;

class CustomerRegister implements ObserverInterface
{
  public function execute(\Magento\Framework\Event\Observer $observer)
  {
    echo "Customer registered";
    $customer = $observer->getEvent()->getCustomer();
    echo $customer->getName();
    exit;
  }
}

registration.php

<?php

\Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::MODULE,
    '<Mynamespace_Mymodulename>',
    __DIR__
);

config.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="<Mynamespace_Mymodulename>" setup_version="1.0.0" />
</config>

Now when a new customer registers himself he sees the error: "We can't save the customer." (though the registration goes well and the new user is saved on the db), plus I don't see any "echo" message and I don't know. if the error message depends on my changes.

How to debug it.

Answer 1

Try below code

<?php

namespace Vendor\Module\Observer;
use Magento\Framework\Event\ObserverInterface;

class CustomerRegister implements ObserverInterface
{
  public function execute(\Magento\Framework\Event\Observer $observer)
  {
    echo "Customer registered";
    $customer = $observer->getEvent()->getCustomer();
    echo $customer->getFirstname();
    echo $customer->getLastname();
    exit;
  }
}

Answer 2

You need update your namespace:

namespace Mynamespace\Mymodule\Model\Observer

use Magento\Framework\Event\ObserverInterface;

Answer 3

Echo is not a way to debug in the observer.

You should create a log file and check if the observer is writing in that log file or not.

e.g file_put_conents("/var/www/html/mymagento/var/log/test.log", $customer->getFirstname())

Use this line instead of echo and check if there is something written in the test.log file. If there is than your observer is working fine.