This aspect executes around a method annotated with
AjaxMethod
It should be used in any method that binds an ajax action where no redirection should be done
In that case :
we log the method call
we execute the method
If no exception is thrown, we log and display a successful result
Else we log and display an error
The treatment of the error depends if it is an
ApplicationException
The way we display a message is delegated to the
MessageHandler