Description:
------------
It's not possible to serialize protected and/or private member variables.

Reproduce code:
---------------
<?php
class MyBean {
	protected $value = null;
	
	public function __construct() { 
		$this->value = "hallo";
	}
	
	public function setValue($value) {
		$this->value = $value;
	}
	
	public function getValue() {
		return $value;
	}
}
$a = new MyBean();
echo json_encode($a); 
?>

Expected result:
----------------
{"value":"hallo"}

Actual result:
--------------
{}