cakephp2.x component not working - cakephp

Question

i create my component like this
<?php
class UtilComponent extends Object
{
function strip_and_clean( $id, $array) {
$id = intval($id);
if( $id < 0 || $id >= count($array) ) {
$id = 0;
}
return $id;
}
}
and use it like this
var $name = 'Books';
var $uses = array();
var $components = array('Util');
public function index($id = 0){
$this -> set('page_heading','Packt Book Store');
$book=array(
'0'=>array(
'bookTitle' =>'Object Oriented Programming with PHP5',
'author' =>'Hasin Hayder',
'isbn' => '1847192564',
'releaseDate' => 'December 2007'
),
'1'=>array(
'bookTitle' =>'Building Websites with Joomla! v1.0',
'author' =>'Hagen Graf',
'isbn' => '1904811949',
'releaseDate' => 'March 2006'
),
);
$id = $this->Util->strip_and_clean( $id, $book);
$this->set('book',$book[$id]);
$this->pageTitle='Welcome to the Packt Book Store!';
}
but i got this error
**call_user_func_array() expects parameter 1 to be a valid callback, class 'UtilComponent' does not have a method 'initialize' [CORE\Cake\Utility\ObjectCollection.php, line 130]**

Answer 1

I believe a component should extend Component not Object:
class UtilComponent extends Component
{
}
The component will then inherit the initialize() method.

Answer 2

Got a similar issue.
Apart from the error message ... does not have a method 'initialize' ..., one more message was there ... does not have a method 'startup' ....
The issue was I created the component file inside the Controller directory instead of Controller/Component.

Answer 3

I also face same issue like
Warning (2): call_user_func_array() expects parameter 1 to be a valid callback, class 'ImageComponent' does not have a method 'initialize' [CORE\Cake\Utility\ObjectCollection.php, line 128]
Warning (2): call_user_func_array() expects parameter 1 to be a valid callback, class 'ImageComponent' does not have a method 'beforeRender' [CORE\Cake\Utility\ObjectCollection.php, line 128]
Warning (2): call_user_func_array() expects parameter 1 to be a valid callback, class 'ImageComponent' does not have a method 'shutdown' [CORE\Cake\Utility\ObjectCollection.php, line 128]
Solution is :
Add Image component into controller/component then
change class ImageComponent extends object { ... }
with class ImageComponent extends Component { ... }