problems upgrading an extension to J4.0 Topic is solved

[rgjoyce]

Does anyone know if extending Joomla classes is still possible?
I have my own library that extends core code a bit, but I'm getting an error.
Call to a member function createModel() on null
in my library, I do this:
class RmkControllerForm extends JControllerForm{

and in my components controller, I am doing this:

$controller = JControllerLegacy::getInstance('Registrationmanagerking');

$controller->execute($input->getCmd('task', ''));

its the execute command that triggers the error.

Any ideas?

[toivo]

JControllerForm has been aliased to ControllerForm, but you could try extending ControllerForm in your component.

[rgjoyce]

The problem was because I forgot to call the parent constructor from within my constructor.

Resolved.